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The AAPG/Datapages Combined Publications Database
Kansas Geological Society
Abstract
Integrated Petrophysical Methods for the Analysis of Reservoir Microarchitecture—a Kansas Chester Sandstone Case Study
Abstract
Traditional log analysis is an inverse procedure in which an interpretation of reservoir fluid and pore volumetrics is made from indirect physical measurements of a logging tool. When logged zones from a well-reservoir interval are plotted on a Pickett resistivity-porosity crossplot, they form a trajectory whose trace is dictated by petrofacies and relative height in the hydrocarbon column. The trajectory graphs the log response "effect" to the reservoir variables "cause," for which multiple interpretations can be possible when attempting the inverse path from log response to reservoir properties. The microarchitecture of the reservoir pore system and its contained fluids determine the resistivity-porosity trajectory and can be modeled using hypothetical parameters or, preferably, from core measurements of porosity, permeability, and capillary pressure. Capillary pressure curves simultaneously describe the size distribution of pore-throats and their aggregate determination of the hydrocarbon column saturation profile. When integrated directly with log measurements of porosity and resistivity, pore-throat sizes and their estimated height above free-water level provide a more comprehensive formulation of petrofacies zonation and fluid producibility that reach beyond the basic volumetric estimations of standard log analysis.
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