--> ABSTRACT: Predicting Lithology and Fluid Properties with Geoscience Inversion, by Margaret A. Lessenger and Timothy A. Cross; #90906(2001)
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Margaret A. Lessenger1, Timothy A. Cross2

(1) Platte River Associates, Boulder, CO
(2) Colorado School of Mines, Golden, CO

ABSTRACT: Predicting Lithology and Fluid Properties with Geoscience Previous HitInversionNext Hit

The new technology of stratigraphic Previous HitinversionNext Hit provides the means of quantitatively linking Previous HitdataNext Hit, concepts, Previous HitmethodsNext Hit and interpretations among geoscience and geoengineering disciplines. The products of this linkage are increased accuracy of interpreting and predicting lithology and fluid properties, and reduction of uncertainty in those predictions. Previous HitInversionNext Hit works with the logic that if the forward model is an adequate simulation of the behavior of the system under analysis, and if the observations being compared with model predictions are correctly measured, then matches of observations with predictions at random locations within a 3-D volume assure correct simulation at other locations.

Mathematical inverse Previous HitmethodsNext Hit have been applied routinely in seismic and borehole geophysics for several decades. In the past decade, they have been used to predict fluid flow paths through strata using information from fluids (e.g., pressure, head, composition). Most recently, they were applied to stratigraphic prediction and predictions were accurate in two case studies. Prior to the application of inverse Previous HitmethodsNext Hit to stratigraphic analysis, interpretation and prediction of lithology and fluid properties using inverse Previous HitmethodsNext Hit relied on analysis of a Previous HitdataNext Hit from a single discipline. With the advent of stratigraphic Previous HitinversionNext Hit, we now have the means of coupling Previous HitdataNext Hit types from multiple disciplines. This is because stratigraphic Previous HitinversionNext Hit provides the carrier to link Previous HitdataNext Hit, concepts, Previous HitmethodsNext Hit and interpretations of fluid and geophysical Previous HitinversionNext Hit. Using simultaneous coupled inversions of more than one Previous HitdataNext Hit type-for example inversions on stratigraphic and fluid Previous HitdataNext Hit or inversions on seismic geometry, seismic attributes and stratigraphic Previous HitdataNext Hit-a portion of the population of solutions provided by one Previous HitdataNext Hit type is eliminated by the populationof solutions derived from the other Previous HitdataTop type. Consequently, the population of possible solutions is reduced, accuracy of predictions is increased, and uncertainties are reduced.

AAPG Search and Discovery Article #90906©2001 AAPG Annual Convention, Denver, Colorado