This is a glossary of terms used in assessment broadly defined and in the related GeoX tools. We constantly strive to make the glossary complete, correct and precise. Please let us know if you miss terms, find our definitions incorrect or incomplete. Thanks for your assistance.
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GeoX Terms (sample)
Accumulation
An individual body of naturally occurring petroleum in a reservoir. Also a connected hydrocarbon reservoir. See also Pool; Segment.
Accumulation size
Estimated success hydrocarbon volumes in an accumulation. For a multiple segment prospect, success size is the hydrocarbon volume for all outcomes where at least one segment in the prospect succeeds.
Adequacy factor
A geological condition that controls the presence of hydrocarbons in a potential accumulation. Typically, we distinguish between three main groups of geological controls or chance factors: hydrocarbon charge, reservoir and sealed closure. See also Chance of Adequacy, Chance factor and Risk factor.
Basin
A depressed, sediment-filled area. In GeoX, Assessments are organized in basins. A play, prospect or segment is always allocated to a basin.
Bayesian Risk Modification
A method for integrating seismic or other anomaly information in risking of segments that includes the use of Bayes Theorem. There are two basic elements in the method. The first is to not only consider success scenarios, but also assess the probability of possible failure scenarios. The second element is to estimate the likelihood of the observed anomaly given each of the success and failure scenarios.
Conditional play potential
Estimated Yet-to-Find hydrocarbon volumes in a play given that the play works -- in other words the success potential of the play. The controlling condition is that all shared play chance of adequacy factors are OK. Distinguish between two estimates of conditional play potential: (A) assuming the number of potential accumulations in the play and (B) assuming at least one accumulation in the play.
Conditional segment probability
Probability of success of segment given that the marginal play probability is equal to 1.0 (i.e. that all the play chance of adequacy controls are OK).
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