Permeability and Electrical Response Characteristics of Rocks Under Effective Stress

doi:10.11885/j.issn.1674-5086.2016.05.26.03

Abstract

Abstract: This study focused on the influence of the effective stress change on the permeability and the formation factor of sandstone reservoirs. By analyzing the deformation rules of differently shaped pore throats under effective stress, we inferred the influence of the change in effective stress on five structural parameters:coordination number (z), pore throat distribution variation coefficient (V_r), hydraulic radius (r_H), pore throat length (l), and pore throat cross-section aspect ratio (ε). In combination with BLM model analysis, we inferred that three types of corresponding relationships exist between the formation factor, permeability, and effective stress:exponential, linear, and log-linear. Moreover, we selected experimental data on the effective stress response of sandstone from different areas, which were verified using different physical properties and varying formation factors and permeability. The results show that the change in the formation factors and permeability of highly porous and highly permeable sandstone under effective stress is mostly caused by changes in the hydraulic radius (r_H) and is manifested through pore throat deformation. The change in the formation factor and permeability of low-porosity low-permeability sandstone samples under effective stress is mostly caused by the coordination number (z) and hydraulic radius (r_H) and is manifested through changes in both pore throat shape and connectivity.

Key words: effective stress, BLM model, permeability, formation factor, pore throat structure

CLC Number:

TE122
P313.1

WANG Minpei, CHEN Meng, LI Min, TANG Yanbing, LI Linfang. Permeability and Electrical Response Characteristics of Rocks Under Effective Stress[J]. 西南石油大学学报(自然科学版), 2017, 39(3): 85-96.

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