1887

Abstract

Summary

We present a novel rock physics model for organic-rich shales. The extended Maxwell homogenization scheme is utilized as a rock physics model for transversely isotropic media. Since shales have complex structures, different components of the rock are modeled as multiple inclusions. First, we estimate the anisotropic clay matrix. This is then used as the host matrix, and quartz, calcite, kerogen, and fluid-filled pores are modeled as inclusions with different aspect ratios. Representation of multiple inhomogeneities with different aspect ratios is non-trivial. The Maxwell homogenization scheme honors the aspect ratio of each inclusion embedded in an effective inclusion domain. Combined rock physics models have been used to obtain elastic properties of clays and shales. Notwithstanding, there is no consistent method for modeling both. Our rock physics model and workflow thoroughly handle the estimation of elastic stiffness coefficients of both clays and shales in anisotropic media. The estimated stiffness coefficients using the rock physics model are constrained by dipole sonic logs from the Eagle Ford shale. This study shows that this rock physics model can be readily applied to other unconventional reservoirs.

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/content/papers/10.3997/2214-4609.202011707
2021-10-18
2021-12-07
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