Summary

Intrinsic anisotropy due to layering as well as induced anisotropy due to fractures play critical role in fluid flow in organic-rich shales. In this paper, we characterize the impact of natural and induced fractures on permeability anisotropy utilizing various resolution CT-scans and present the effect of stress on the permeability of such fractured reservoirs. The effect of shale layering on fluid flow is also discussed.

Wettability is another key factor in determining the fluid flow and recovery efficiency in shale reservoirs. We investigated the wettability of several shale samples from Eagle Ford, Mancos, Green River, Bakken and Niobrara shale plays. The effects of total organic carbon and maturity on contact angle in these shale formations are presented.

Introduction

Permeability is a key petrophysical property that influences the production rate from any gas or oil reservoir. Obtaining the permeability of organic-rich shales is challenging due to the intrinsic ultra-low matrix permeability, layering, and the presence of induced and/or natural fractures in such formations.

URTeC 1555068

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