A measure of fluid flow or deliverability of fluids from a rock; it can only be measured directly from the examination of actual rock samples such as cores. Fluids contained in the pores of a rock cannot flow if it lacks sufficient permeability.


Pertaining to the scientific study and classification of rocks.


Pertaining to the study of the physical and chemical properties of rocks, especially as it relates to their fluid holding properties.


A measure of the fluid storage capacity of a rock; it can be determined by examination of cores or subsurface data.


Various steps necessary to care for geoscience data and collections including: data acquisition, organization and maintenance, making users aware of samples and data, making data accessible, and assuring that data are useful and of sufficient quality.


The process by which a collection is evaluated against specific criteria. For example, a profile indicator or criterion might consist of conservation status, arrangement, or storage container quality.


An avalanche of hot ash, pumice, rock fragments, and volcanic gas that spills down the side of a volcano at a rate of 100 km/hour or more. The temperature within these flows may be greater than 500° C. Once these flows have been deposited, they may flatten and weld together as a result of the intense heat and the weight of the overlying material.


A storage facility that may or may not be climate controlled. For instance, a core repository will contain cores in addition to cuttings, logs, and other samples that either directly or indirectly augment the core collections themselves. Geoscience repositories contain both geoscience data and collections.


A porous and permeable mass of rock that contains and/or transmits fluids.


A summary of a well’s important information (e.g., drilling rates, total depth, production rates) prepared by a scout, an individual employed to gather such information, often from a competitor, by all available means.


Production of oil or gas as a result of artificially augmenting the reservoir energy (drive), as by injection of water or other fluid.


Rock resulting from the consolidation of loose sediment that has accumulated in layers.


A picture of the Earth’s crust results of sending vibrations (produced by explosions or mechanical devices) into the Earth’s crust. Different layers within the crust reflect these vibrations in different ways and thereby allow scientists to develop a picture of the structure of the crust across wide areas.


A collection of servers that exchange large volumes of data and information across the Internet.


A sub-discipline of geology that deals with the origin, composition, distribution, and succession of strata or the overall arrangement of strata.

STRATUM (pl. strata)

A layer of sedimentary rock visually distinguishable from other layers above and below.


A contiguous surface area beneath which one or more petroleum reservoirs either has produced or is expected to produce more than 5 billion barrels of oil or more than 30 trillion cubic feet of combustible gas.


The study of the types and diversity of organisms and their relationships.


A tract or region of the Earth’s surface considered as a physical feature or other distinguishing characteristic.


A fragment of rock mechanically ground to a thickness of about a thousandth of an inch (0.03 mm) and mounted on a glass slide for microscopic examination.


A fault with a dip (incline) of 45 degrees or less on which the overlying side of the fault appears to have moved upward relative to the underlying side.


The location or route followed by a seismic survey.


The single specimen on which the original description of a particular species is based, which serves as a permanent point of nomenclatural reference for the application of the name of that species.


A small unfilled cavity in rock.


The simplest form of storage; does not include curation of samples, or promoting accessibility.


A method of secondary recovery in which water is injected into an oil reservoir to force additional oil out of the reservoir rock and into the well bores of producing wells.


A bore hole sunk into the ground for the purpose of obtaining fluids such as water or oil and gas.


A graphic paper or electronic record of remotely measured observations or tests made on the rocks through which the drill passed plotted as a continuous function of depth.

SOURCE: DOE, nd; Sheriff, 1994; and Jackson, 1997.

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