Fault (geology)

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(Redirected from Geologic fault)
"Fault line" redirects here. For other uses, see Fault line (disambiguation).
"Faults" redirects here. For other uses, see Fault.
In geology, a fault or fault line is a planar fracture in rock in which the rock on one side of the fracture has moved with respect to the rock on the other side. Large faults within the Earth's crust are the result of differential or shear motion and active fault zones are the causal locations of most earthquakes. Earthquakes are caused by energy release during rapid slippage along a fault. A fault that runs along the boundary between two tectonic plates is called a transform fault.
Since faults do not usually consist of a single, clean fracture, the term fault zone is used when referring to the zone of complex deformation that is associated with the fault plane. The two sides of a non-vertical fault are called the hanging wall and footwall. By definition, the hanging wall occurs above the fault and the footwall occurs below the fault. This terminology comes from mining. When working a tabular ore body the miner stood with the footwall under his feet and with the hanging wall hanging above him.

Fault in shales near Adelaide, Australia
Contents
1 Mechanics
1.1 Microfracturing and AMR theory
2 Slip, heave, throw
3 Fault types
3.1 Dip-slip faults
3.2 Strike-slip faults
3.3 Oblique-slip faults
4 Fault rock
5 See also
6 References
7 External links
//
Mechanics

The Junction fault, dividing the Allegheny Plateau and the true Appalachian Mountains in Pennsylvania.
The creation and behaviour of faults, in both an individual small fault and within the greater fault zones which define the tectonic plates, is controlled by the relative motion of rocks on either side of the fault surface.
Because of friction and the rigidity of the rock, the rocks cannot simply glide or flow past each other. Rather, stress builds up in rocks and when it reaches a level that exceeds the strain threshold, the accumulated potential energy is released as strain, which is focused into a plane along which relative motion is accommodated the fault.
Strain is both accumulative and instantaneous depending on the rheology of the rock; the ductile lower crust and mantle accumulates deformation gradually via shearing whereas the brittle upper crust reacts by fracture, or instantaneous stress release to cause motion along the fault. A fault in ductile rocks can also release instantaneously when the strain rate is too great. The energy released by instantaneous strain release is the cause of earthquakes, a common phenomenon along transform boundaries.
Microfracturing and AMR theory
Microfracturing, or microseismicity, is sometimes thought of as a symptom caused by rocks under strain, where small-scale failures, perhaps on areas the size of a dinner plate or a small area, release stress under high strain conditions. It is only when sufficient microfractures link up into a large slip surface that a large seismic event or earthquake can occur.
According to this theory, after a large earthquake, the majority of the stress is released and the frequency of microfracturing is exponentially lower. A related theory, accelerating moment release (AMR), hypothesizes that the seismicity rate accelerates in a well-behaved way prior to large earthquakes, and may be a promising tool for earthquake prediction on the scale of days to years.
This is being increasingly used to predict rock failures within mines and applications are being attempted for the portions of faults within brittle rheological conditions. Similar behaviour is observed in the tremors preceding volcanic eruptions.
Slip, heave, throw

A fault in Barieux, France. The left part moves down while the right part moves up.
The sense of slip is defined by the relative movements of geological features present on either side of the fault plane and is a vector. The sense of slip defines the type of fault. This is distinct from the throw of the fault, which is the vertical offset. Heave is the measured horizontal offset of the fault.
The vector of slip can be qualitatively measured by fault bend folding, i.e. drag folding of strata on either side of the fault; the direction and magnitude of heave and throw can be measured only by finding common intersection points on either side of the fault. In practise it is usually only possible to find the slip direction of faults, and an approximation of the heave and throw vector.
Fault types
Faults can be categorized into three groups based on the sense of slip. A fault where the main sense of movement (or slip) on the fault plane is vertical is known as a dip-slip fault. Where the main sense of slip is horizontal the fault is known as a transcurrent or strike-slip...(and so on)

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Rudolf Heidenhain

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Rudolf Peter Heinrich Heidenhain (January 29, 1834 - October 13, 1897) was a German physiologist who was born in Marienwerder, East Prussia (now Kwidzyn, Poland). He studied medicine at the Universities of Halle and Berlin. After receiving his doctorate, he remained in Berlin as an assistant to Emil du Bois-Reymond (1818-1896). In 1856 he returned to Halle and worked in the laboratory of Alfred Wilhelm Volkmann (1801-1877). In 1859 he attained the chair of physiology at the University of Breslau, where he remained for the rest of his career. Two of his famous students at Breslau were Karl Weigert (1845-1904) and Ivan Petrovich Pavlov (1849-1936).
Heidenhain is remembered for his work involving muscle and nerve physiology, and contributions made in the study of physiological thermoelectrics. He demonstrated the muscles' self-regulatory process for expenditure of energy, as well as its ability to "economize" energy. Heidenhain showed that total output energy (heat and mechanical work) increases with an increased load, in other words, a muscle freed more energy when resistance to its contraction was greater. Also, when a muscle was fatigued, it had the ability to work more economically. Heidenhain's research also dealt with the study of heat production during muscular activity. He was able to detect and measure a small increase of temperature during the slightest muscular movement.
Heidenhain did extensive research concerning the secretory and absorption processes of glands. He studied the stomach's gastric glands and the processes it used to produce pepsin and hydrochloric acid. Also, the eponymous demilunes of Heidenhain were described by him. These are half-moon shaped cellular structures associated with the salivary glands.
Heidenhain also performed scientific studies on hypnotism. His research was from a physiological basis, and he explained hypnosis in terms of inhibition of the cortex. Later, Ivan Pavlov carried on Heidenhain's physiological studies of hypnosis. Also, while an assistant at Halle, Heidenhain made improvements on Hermann Welcker (1822-1897) methodology for measurement of blood volume. His son, Martin Heidenhain (1864-1949) was a highly regarded anatomist.
References
Who Named It?; Rudolf Heidenhain
Categories: 1834 births | 1897 deaths | German physiologists | People from Kwidzyn | People from the Province of Prussia | Humboldt University of Berlin alumni | University of Halle-Wittenberg alumni | University of Wroc?aw faculty(and so on)

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Kids Return

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Kids Return
Directed by
Takeshi Kitano
Produced by
Masayuki MoriYasushi TsugeTakio Yoshida
Written by
Takeshi Kitano
Starring
Masanobu AndoKen KanekoLeo MorimotoHatsuo YamataniMichisuke KashiwayaMitsuko OkaYuuko DaikeRyo Ishibashi
Music by
Joe Hisaishi
Cinematography
Katsumi Yanagishima
Editing by
Takeshi Kitano
Distributed by
Office Kitano
Release date(s)
1996
Running time
103 min
Language
Japanese
Kids Return (???????? ,Kizzu Rit?n?) is a 1996 Japanese film written, edited and directed by Takeshi Kitano. The film was made directly after Kitano recovered from a motorcycle wreck that left one side of his body paralyzed. After extensive surgery and physical therapy he quickly went about making Kids Return amidst speculation that he might never be able to work again. The music was composed by Joe Hisaishi, and the cinematographer was Katsumi Yanagishima.
Contents
1 Plot
2 Reception
3 Cast and roles
4 External links
//
Plot
The movie is about two high school dropouts, Masaru (Ken Kaneko) and Shinji (Masanobu Ando), who try to find a direction and meaning in their livesne by becoming a yakuza lieutenant, the other by becoming a boxer.
Reception
At the time of its release it was his most successful film yet in his native Japan, which until then had been notedly much less enthusiastic about his films than international viewers.
Cast and roles
Ken Kaneko - Masaru
Masanobu Ando - Shinji
Leo Morimoto - Teacher
Hatsuo Yamatani - Boxing club manager (credited as Hatsuo Yamaya)
Michisuke Kashiwaya - Hiroshi
Mitsuko Oka - Coffee-shop owner, Sachiko's mother
Yuuko Daike - Sachiko
Ryo Ishibashi - Local Yakuza chief
Susumu Terajima - No 2 in local gang
Moro Morooka - Hayashi
Peking Genji
Atsuki Ueda - Reiko
K?tar? Yoshida
Koichi Shigehisa - Trainer
Ky?suke Yabe
Yoshitaka ?tsuka - Delinquent group
Masami Shimoj? - Yakuza godfather
Kazuki Oh
Shintar? Hasegawa
Kanji Tsuda
Yojin Hino - Taxi office worker (credited as Y?jin Hino)
Ren Osugi - Taxi passenger
Takashi Hagino
External links
Kids Return at the Internet Movie Database
Kids Return at Allmovie
"???????????" (in Japanese). Japanese Movie Database. http://www.jmdb.ne.jp/1996/dt001880.htm. Retrieved on 2007-07-19.
Reviews
Nippon Cinema
Review from Senses of Cinema

v?d?eFilms directed by Takeshi Kitano
Violent Cop (1989) ? Boiling Point (1990) ? A Scene at the Sea (1991) ? Sonatine (1993) ? Getting Any? (1995) ? Kids Return (1996) ? Hana-bi (1997) ? Kikujiro (1999) ? Brother (2000) ? Dolls (2000) ? Zat?ichi (2003) ? Takeshis' (2005) ? Glory to the Filmmaker! (2007) ? Achilles and the Tortoise (2007)
Categories: 1996 films | Japanese films | Japanese-language films | Films directed by Takeshi Kitano | Boxing films | Japanese film stubs
Hidden categories: Articles containing Japanese language text(and so on)

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Rockaby

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Scene from the Beckett on Film adaptation of Rockaby, starring Penelope Wilton
Rockaby is a short, one woman play by Samuel Beckett. It was written in 1980, in English, at the request of Daniel Labeille who produced it on behalf of Programs in the Arts, State University of New York, for a festival and symposium in commemoration of Beckett's 75th birthday. The play premiered on April 8, 1981 at the State University of New York at Buffalo, starring Billie Whitelaw and directed by Alan Schneider. A documentary film, Rockaby, by D. A. Pennebaker and Chris Hegedus records the rehearsal process and the first performance. This production went on to be performed at the Annex at La MaMa Experimental Theatre Club,[1] and, in December 1982, at the Cottesloe, Royal National Theatre, London.
Contents
1 Synopsis
1.1 Section 1
1.2 Section 2
1.3 Section 3
1.4 Section 4
2 Background
3 Related Texts
3.1 Krapp Last Tape
3.2 Murphy
3.3 Film
4 References
5 External links
//
Synopsis
A woman dressed in an evening gown, is sitting in a wooden rocking chair; no other props or scenery are called for. She sits totally still until the very end of the play. The chair apparently starts and stops ocking of its own accord, since her feet are visible on its footrest. The motion creates a ghostly atmosphere.2] The woman (W) is described in the notes as rematurely old. Unkempt grey hair. Huge eyes in white expressionless face.3] Beckett is equally specific when it comes to the gown: lack lacy high-necked Long sleeves. Jet sequins Incongruous headdress set with extravagant trimming to catch the light.3]
As she rocks she hears a ull, expressionless4] pre-recorded voice (V) her own recount details from her own life, and that of her dead mother, in the form of, what Eric Brater describes as, performance poem in the shape of a play.5]
he French title, Berceuse, means both ocking chair and ullaby, while the English Rockaby refers to a traditional lullaby in which a baby cradle falls from a treetop, thus bring together in one song the images of birth and death which are so often juxtaposed in Beckett.6] Both a traditional cradle and a rocking chair have rockers. T]he synchrony of the rocking motion and the dimeter verse line one back-and-forth per line plays against the recorded narrative.7] To achieve this effect Billie Whitelaw was encouraged by Beckett to think of it as a lullaby which she interpreted as oft, monotonous, no colour, soothing, rhythmic [a] drive toward death.8]
The play can be broken down into four sections. All begin with the childlike demand, ore (consider Oliver Twist request for more gruel). Billie Whitelaw pronounced it more like aw a pun o suggest a need for nourishment.9] or even a.[10]
Intermittently, she joins in three of the lines: ime she stopped, iving soul and ock her off[11] at which point the rocking stops and only starts again when she demands ore, each time a little softer than the time before. The fact that time play begins with this word indicates that this scene has been being played out for some time before this. At the end of the final section the woman fails to join in with the voice, the rocking ceases and the woman head slowly inclines; he has apparently died.11]
Section 1
he first section details W decision to stop going o and fro in the outside world in search of nother like herself[12] evocative of Molloy quest to find his mother. The voice speech is fragmented and simple reating an affinity between the language of the child and that of senescence and dying.13] This could also be a reason for the uge eyes.[14]
As with Not I, the voice speaks in the third person.
Section 2
The second section reprises and therefore emphases the decision taken in Section 1. It also marks the eginning of her next phase of activity sitting at her upstairs window, searching the windows opposite[15] to see another ne living soul like herself.[16]
ife is nothing more nor less than the act of perception or the state of being perceived, or, in the words of Bishop Berkeley which find echoes throughout Beckett work, sse est percipi17] (o be is to be perceived). She sees no one however and is seen by no one. oice has become the woman own Berkeleyan observer, without whose surveillance any claim to existence would be invalidated.18]
Section 3
In the third section the woman has lowered her standards again. She would be content now to simply see a raised blind as evidence of life. At the end of this section she realises it is ime she stopped19] even this activity.
drawn blind [is] and old custom signifying death20] and the last thing she does herself before sitting down in the old rocker is et down the blind21] before closing her own eye lids. This decision [is] first announced in part three by the lines ill...(and so on)

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Bugs Bunny Rabbit Rampage

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Bugs Bunny Rabbit Rampage
Developer(s)
Sunsoft
Publisher(s)
Sunsoft
Platform(s)
Super NES
Release date(s)
JP June 24, 1994NA February 1994EU September 29, 1994
Genre(s)
Action
Mode(s)
Single-player
Media
12-megabit Cartridge
Bugs Bunny Rabbit Rampage is a Super NES action game where the player controls Bugs Bunny as he fights traditional Looney Tunes villains in order to confront the main villain of the story, animator Daffy Duck. The game's title is derived from the 1955 animated short Rabbit Rampage, which follows a similar plot of Bugs at the mercy of an antagonistic animator.
In Japan the game was released as Bakkusu Ban? Hachamecha Daib?ken (??????????????????, Bugs Bunny's Insane Great Adventure).
Levels
Most levels in the game are based around various Looney Tunes shorts.
Level 1.1: A snow forest level where Bugs battles Elmer Fudd and his hunting dogs, as well as the Goofy Gophers. Defeat Elmer by punching him in the face with a pie and then scurring down a rabbit hole. While in the rabbit hole, Elmer will shoot a bullet that will miss you. When you emerge from the ground, repeat this process. When you get enough hits, Bugs will stick his finger in the barrel of the gun, causing the bullet to fire back at Fudd's face.
Level 2.1: This level takes place in a saloon bar. The Red Hot Ryder and Hiawatha cameo as one of the enemies here. Bartenders try trick you by sliding beers down the counter tops. Big holes in the floor can only be crossed by jumping on nearby TNT barrels. The barrel will explode and the lid will fly skyhigh. Before you do battle, post a "Bugs was here" sign. Nasty Canasta from Drip-Along Daffy awaits Bugs at the end. To win, stick next to him and jump up on him repeatedly. The final blow will send him down a hole in the floor.
Level 400: Toro the bull from the animated short Bully For Bugs is here. It's best to go to the right first. Stop in front of a bulls-eye target to lure the bull near you. Jump up and right out of the way just in time for the bull to smash into the target and not Bugs. The bull will be dizzy from the impact, so quickly head to the next target. When you reach the right side of the arena, grab the 1 and the anvil and start heading to the left side. Avoid the bull jumping over him when he charges. You need to jump to the right to avoid his first charge and the left on his second charge. Look for anvils and other items in the rabbit holes. On the left side, get the bull to run into the white wall to pass underneath it to reach a big switch. Flip the switch to release a metal wall on the right side of the arena. Head back to the right side, jump over the bull and drop an anvil for him to run into. Continue to the right using anvils whenever necessary. If you run out of anvils, you will need to use the previous technique of jumping over the bull's charges. Bugs must make the bull crash into a steel girder. An early screenshot of this level (printed in Nintendo Power issue #55) showed early Looney Tunes star Bosko as one of the characters in the audience watching the fight; he does not appear in the finished version, however.
Level 1.3: This level is based around the Bewitched Bunny short. It features Witch Hazel (and her gingerbread men army who throw candy), who casts temporary spells on Bugs (one of them transforms him into Michigan J. Frog; Hansel and Gretel; the three pigs from the short Windblown Hare, who use slingshots to throw acorns; and the big bad wolf, who tries to blow tumbleweeds, wood, and bricks at you or blow you away. At the end, Yosemite Sam shows up in his outfit from the animated short Knighty Knight Bugs, complete with his dragon. Make his dragon sneeze back several times. Then the dragon will stop charging and Yosemite Sam will fall off his dragon and smash on the ground being flattened. The Goofy Gophers also show up in this level.
Level 2001: This level takes place on Martian space vehicles. Some Instant Martians attack Bugs with laser guns, which can shrink him temporarily. Bugs can deflect these shots back at the Martians with mirrors, shrinking them instead. Marvin the Martian also makes an appearance.
Level 9.1: Bugs must traverse Tasmania in this level. The Tasmanian Devil constantly tries to attack Bugs. Get the Tasmanian Devil to fall off the ground or eat exploding TNT turkeys. But he wil return appearing from underground. Hop on giant parrots to get to different grounds. Head to the right side. When the Tasmanian Devil spins like a twister, jump up and have him go through trees to go further. When you get to the white tree, have him hit the tree and a coconut will fall on his head. After several hits, Bugs will dress up as a Tasmanian She-Devil and the Tasmanian Devil will fall in love with him. Then the real she-devil (whom the Tasmanian Devil married) comes in, starts smacking...(and so on)

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Indian Head, Maryland

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Indian Head, Maryland
Location of Indian Head, Maryland
Coordinates: 3835?52?N 779?25?W? / ?38.59778 77.15694? / 38.59778; -77.15694
Country
United States
State
Maryland
County
Charles
Area
-Total
1.2sqmi(3.2km2)
-Land
1.2sqmi(3.2km2)
- Water
0.0sqmi(0.0km2)
Elevation
105ft (32m)
Population (2000)
-Total
3,422
-Density
2,792.7/sqmi(1,078.3/km2)
Time zone
Eastern (EST) (UTC-5)
-Summer(DST)
EDT (UTC-4)
ZIP code
20640
Area code(s)
301
FIPS code
24-41500
GNIS feature ID
0590532
Indian Head is a town in Charles County, Maryland, United States. The population was 3,422 at the 2000 census. It has been the site of a naval base specializing in gun and rocket propellants since 1890.[1] The name of the base has varied over the years from Naval Powder Factory, to Naval Propellant Plant, to Naval Ordnance Station, to the present Naval Support Facility Indian Head. The facility's main tenant activity is the Indian Head Naval Surface Warfare Center (NSWC/IH). Advanced research in energetic systems takes place at NSWC/IH. NSWC/IH absorbed the function of the closed Naval Ordnance Laboratory, formerly in White Oak, MD. 3,700 employees currently work at the base.
Contents
1 History
2 Geography
3 Demographics
4 References
5 External links
//
History
The city of Indian Head was incorporated in 1920. One source cites that its name came from a legend relating to the Algonquin Indian tribe. Another story claims that the town was named Indian Head because it resembles an Indian head from the air. But the simplest explanation is that the peninsula, a "head" of land, was occupied by Indians when the first white settlers arrived - thus "Indian Head" means "Indian Peninsula."
Indian Head was a thriving small town during the WWII years and up until the late 1960s. The construction of St. Charles, a giant planned community south of nearby Waldorf, brought with it retail chains and big-box stores, which attracted Indian Head's shopping dollars and started the demise of local businesses.
Today, Indian Head is rich in history but is lacking many basic retail and service businesses.[citation needed] Many remedies for this situation have been attempted, but the desired growth has been slow in coming. Indian Head is bisected by Maryland Route 210, generally known as Indian Head Highway, which dead-ends in the middle of town at the entrance to Indian Head Naval Support Facility. Because of this, the town cannot benefit from through-traffic, but must be a destination in its own right.
Plans to build a massive "Chapman's Landing" housing development a few miles to the north, were thwarted in the 1990s when the state government purchased the land to preserve as green space under its "smart growth" program.
The town recently opened a "black box" stage theater, a new community center building, new ball fields, and is exploring other efforts to revitalize the town. A year-round swimming pool is at the nearby Henry E. Lackey High School.
Geography
Indian Head is located at 3835?52?N 779?25?W? / ?38.59778 77.15694? / 38.59778; -77.15694 (38.597781, -77.156926)[2].
According to the United States Census Bureau, the town has a total area of 1.2square miles (3.2km2), all of it land.
Demographics
As of the census[3] of 2000, there were 3,422 people, 1,222 households, and 888 families residing in the town. The population density was 2,792.7 people per square mile (1,074.2/km2). There were 1,311 housing units at an average density of 1,069.9/sqmi (411.5/km2). The racial makeup of the town was 55.64% White, 38.08% African American, 1.78% Native American, 1.43% Asian, 0.03% Pacific Islander, 0.47% from other races, and 2.57% from two or more races. Hispanic or Latino of any race were 1.69% of the population.
There were 1,222 households out of which 44.3% had children under the age of 18 living with them, 43.5% were married couples living together, 22.9% had a female householder with no husband present, and 27.3% were non-families. 21.1% of all households were made up of individuals and 5.8% had someone living alone who was 65 years of age or older. The average household size was 2.80 and the average family size was 3.26.
In the town the population was spread out with 33.0% under the age of 18, 8.4% from 18 to 24, 34.3% from 25 to 44, 16.7% from 45 to 64, and 7.6% who were 65 years of age or older. The median age was 31 years. For every 100 females there were 94.3 males. For every 100 females age 18 and over, there were 87.0 males.
The median income for a household in the town was $42,702, and the median income for a family was $48,375. Males had a median income of $35,625 versus $31,451 for females. The per...(and so on)

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Hydrocarbon exploration

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(Redirected from Oil exploration)

Drilling Tower
Hydrocarbon exploration (or oil and gas exploration) is the search by petroleum geologists for hydrocarbon deposits beneath the Earth's surface, such as oil and gas. Oil and gas exploration are grouped under the science of petroleum geology.
Contents
1 Exploration methods
2 Elements of a petroleum prospect
3 Terms used in petroleum evaluation
4 Licensing
5 Reserves and resources
5.1 Definition of oil reserves
5.2 Reserve booking
6 See also
7 External links
//
Exploration methods
Visible surface features such as oil seeps, natural gas seeps, pockmarks (underwater craters caused by escaping gas) provide basic evidence of hydrocarbon generation (be it shallow or deep in the Earth). However, most exploration depends on highly sophisticated technology to detect and determine the extent of these deposits using exploration geophysics. Areas thought to contain hydrocarbons are initially subjected to a gravity survey, magnetic survey, passive seismic or regional seismic reflection surveys to detect large scale features of the sub-surface geology. Features of interest (known as leads) are subjected to more detailed seismic surveys which work on the principle of the time it takes for reflected sound waves to travel through matter (rock) of varying densities and using the process of depth conversion to create a profile of the substructure. Finally, when a prospect has been identified and evaluated and passes the oil company's selection criteria, an exploration well is drilled in an attempt to conclusively determine the presence or absence of oil or gas.
Oil exploration is an expensive, high-risk operation. Offshore and remote area exploration is generally only undertaken by very large corporations or national governments. Typical Shallow shelf oil wells (e.g. North sea) cost USD$10 - 30 Million, while deep water wells can cost up to USD$100 million plus. Hundreds of smaller companies search for onshore hydrocarbon deposits worldwide, with some wells costing as little as USD$100,000.
Elements of a petroleum prospect
A prospect is a potential trap which geologists believe may contain hydrocarbons. A significant amount of geological, structural and seismic investigation must first be completed to redefine the potential hydrocarbon drill location from a lead to a prospect. Five elements have to be present for a prospect to work and if any of them fail neither oil nor gas will be present.
A source rock - When organic-rich rock such as oil shale or coal is subjected to high pressure and temperature over an extended period of time, hydrocarbons form.
Migration - The Hydrocarbons are expelled from source rock by three density-related mechanisms: the newly-matured hydrocarbons are less dense than their precursors, which causes overpressure; the hydrocarbons are lighter medium, and so migrate upwards due to buoyancy, and the fluids expand as further burial causes increased heating. Most hydrocarbons migrate to the surface as oil seeps, but some will get trapped.
Trap - The hydrocarbons are buoyant and have to be trapped within a structural (e.g. Anticline, fault block) or stratigraphic trap
Seal or cap Rock - The hydrocarbon trap has to be covered by an impermeable rock known as a seal or cap-rock in order to prevent hydrocarbons escaping to the surface
Reservoir - The hydrocarbons are contained in a reservoir rock. This is a porous sandstone or limestone. The oil collects in the pores within the rock. The reservoir must also be permeable so that the hydrocarbons will flow to surface during production.
Terms used in petroleum evaluation
Lead - a structure which may contain hydrocarbons
Dry Hole - Counter-intuitively, a formation that contains brine instead of oil.
Flat Spot - An oil-water contact on a seismic section; flat due to gravity.
Bright Spot - On a seismic section, coda that have high amplitudes due to a formation containing hydrocarbons.
Prospect - a lead which has been fully evaluated and is ready to drill
Play - A particular combination of reservoir, seal, source and trap associated with proven hydrocarbon accumulations
Chance of Success - An estimate of the chance of all the elements (see above) within a prospect working, described as a probability. High risk prospects have a less than 10% chance of working, medium risk prospects 10-20%, low risk prospects over 20%. Typically about 40% of wells recently drilled find commercial hydrocarbons.
Hydrocarbon in Place - amount of hydrocarbon likely to be contained in the prospect. This is calculated using the volumetric equation - GRV x N/G x Porosity x Sh x FVF
GRV - Gross Rock volume - amount of rock in the trap above the hydrocarbon water contact
N/G - net/gross ratio -...(and so on)

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Direct digital manufacturing

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(Redirected from Direct Digital Manufacturing)
Direct digital manufacturing is a manufacturing process which manifests physical parts directly from 3D CAD files or data using additive fabrication techniques, also called 3D printing or Rapid Prototyping. The 3D printed part or parts are intended to be used as the final product itself with minimal post-processing.
Contents
1 Additive Manufacturing
1.1 Advantages
2 Technologies
3 Direct Digital Manufacturing Usage
4 References
4.1 External links
//
Additive Manufacturing
Additive Manufacturing is also referred to as Additive Freeform Fabrication, Rapid Prototyping, Layered manufacturing or 3D printing. The technique physically constructs or manifests 3D geometries directly from 3D CAD. The history of the process spans approximately 25 years. It was originally known as Rapid Prototyping because the technology was used to make prototypes of parts without having to invest the time or resources to develop tooling or other traditional methods. Since the process was slow, it was used solely for prototyping.
Additive Manufacturing or Direct Digital Manufacturing is an extension of Rapid Prototyping to produce greater quantities of parts. As of 2007, the required machines have become practical in price, speed, reliability, and cost of use. This has led to the expansion of their use in industry. There has been explosive growth in the sales and distribution of the hardware. A new industry has emerged to create software to enable more effective use of the technology. Also, the number of materials that the machines can process has increased greatly in the decade to 2007. [1] Modern machines can utilize a broad array of plastics & metals.
As the speed, reliability, and accuracy of the hardware improves, additive manufacturing may replace or complement traditional manufacturing in creating end-use products. Additive manufacturing eliminates much of the labor associated with traditional manufacturing.
The use of the technology is likely to grow. In 2007 a sub-$4,000 machine was presented. 3D printing bureaus have sprung up around the globe.
Advantages
1.) Energy efficiency: Only the energy necessary to form the part is expended, and waste is eliminated. This contrasts with conventional machining, in which energy is used to smelt metal into ingots, which become billet materials. These billet materials are then machined, removing a great deal of the material to produce the final part. The energy used to create the original block of material is wasted.
2.) Low material waste: Since the process only forms the desired part, there is almost no waste formed, again in contrast to conventional machining. The absence of waste enhances energy efficiency, as energy is not used to transport or dispose of waste.
Technologies
There are presently about 25 3D printing technologies. The oldest is layered object manufacturing. The next oldest is stereolithography. More recent technologies include selective laser sintering, inkjet technologies, fused deposition modeling and many variations. All of these technologies take a 3D model, compute cross-sections of that model, and then deposit the cross-sections sequentially on top of each other until the final geometry is achieved.
To visualize how 3D printing works, consider slicing a ham on a meat slicing machine. The slices are cross-sections which can be stacked to reproduce the form of the original ham.
Varying the layer thickness affects the model surface finish. Many methods have been devised to improve surface finishes; these usually slow down the printing process.
Direct Digital Manufacturing Usage
There are presently around 50 commercially viewable examples of 3D printing being used for tooling or intermediate parts. The technology is still new and its use is directly dependent on users' knowledge of engineering to design a part and effectively use the printing equipment. The growth of the market is nevertheless fast, at 33% annually or better according to Terry Wohlers.
References
^ Moldmaking Technology, Terry Wohlers
External links
Digital Reality, Inc. - A startup company in Austin, Texas, holds several patents pertaining to mass customization utilizing Direct Digital Manufacturing.
Categories: Product lifecycle management | Engineering | Production and manufacturing | Information technology management
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