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Chapter from:
AAPG Memoir 71 : Reservoir Characterization-Recent Advances
Edited by Richard A. Schatzinger and John F. Jordan
Copyright 1999 by The American Association of Petroleum Geologists. All rights reserved.
Memoir 71, Chapter 27: Nonparametric Transformations for Previous HitDataNext Hit Correlation and Integration: From Theory to Practice , by Akhil Datta-Gupta, Guoping Xue, and Sang Heon Lee , Pages 381 - 396

Chapter 27
Nonparametric Transformations for Previous HitDataNext Hit Correlation and Integration: From Theory to Practice

Akhil Datta-Gupta
Guoping Xue
Sang Heon Lee
Department of Petroleum Engineering
Texas A&M University
College Station, Texas, U.S.A.


ABSTRACT

The purpose of this paper is two-fold. First, we introduce the use of nonparametric transformations for correlating petrophysical Previous HitdataNext Hit during reservoir characterization. Such transformations are completely Previous HitdataNext Hit driven and do not require an a priori functional relationship between response and predictor variables, which is the case with traditional multiple regression. The transformations are very general, computationally efficient, and can easily handle mixed Previous HitdataNext Hit types; for Previous HitexampleNext Hit, continuous variables such as porosity, and permeability, and categorical variables such as rock type and lithofacies. The power of the nonparametric transformation techniques for Previous HitdataNext Hit correlation has been illustrated through synthetic and Previous HitfieldNext Hit examples. Second, we use these transformations to propose a two-stage approach for Previous HitdataNext Hit integration during heterogeneity characterization. The principal advantages of our approach over traditional cokriging or cosimulation methods are: (1) it does not require a linear relationship between primary and secondary Previous HitdataNext Hit, (2) it exploits the secondary information to its full potential by maximizing the correlation between the primary and secondary Previous HitdataNext Hit, (3) it can be easily applied to cases where several types of secondary or soft Previous HitdataNext Hit are involved, and (4) it significantly reduces variance function calculations and thus greatly facilitates non-Gaussian cosimulation. We demonstrate the Previous HitdataNext Hit integration procedure using synthetic and Previous HitfieldNext Hit examples. The Previous HitfieldNext Hit Previous HitexampleNext Hit involves estimation of pore-footage distribution using well Previous HitdataTop and multiple seismic attributes.

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