Roy D. Nurmi, 1991. "Integration of Borehole Data for Improved Reservoir Characterization", The Integration of Geology, Geophysics, Petrophysics and Petroleum Engineering in Reservoir Delineation, Description and Management, Robert Sneider, Wulf Massell, Rob Mathis, Dennis Loren, Paul Wichmann
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Most reservoirs are undersampled, thus making integration of all available data necessary for reservoir characterization. Although there is a wealth of data in individual wells, it's effective integration generally requires a good understanding of measurements strengths and limitations, including vertical resolution and volume measured. The importance of understanding the details of measurements has been demonstrated by recent reservoir studies from Egypt to India. The heterogeneous variation of porosity in carbonate reservoirs (at every scale of examination from microns to kilometers) requires careful integration to adequately characterize such reservoirs. The routine evaluation of the standard measurements (core, well log, and testing) in such systems (Cretaceous and Tertiary) are often found to be erroneously interpreted because there are many types of heterogeneities. Moreover, fractured carbonate reservoirs require even more careful integration of core, well log data, and well testing data, especially when the analysis includes thin permeable streaks as are present in some giant Khuff gas reservoirs of The Gulf. These and other giant reservoirs need detail geological reservoir studies and high resolution measurements. Core petrophysical data and well log data are often both needed and should be routinely integrated rather than only being compared for quality control.
The geological and geometrical analysis of borehole data sometimes allows the projection of structural and/or sedimentological information away from the borehole. ‘Similar fold’ modelling can be used to construct structural cross-sections around individual wells using dip data on a geological workstation. The value of this approach has been demonstrated in the analysis of faulting