Evaluation method and influencing factors of brittleness characteristics in low-permeability sandstone reservoirs

doi:10.3969/j.issn.1006-6535.2025.06.008

Abstract

Abstract: To address the problem that the unclear brittleness characteristics and influencing factors of low-permeability sandstone reservoirs restrict fracturing optimization design, the study takes cores from the Wenchang Formation in the Pearl River Mouth Basin and the third member of the Shahejie Formation in the Bohai Bay Basin as research objects. Using the principle of post-peak energy conservation, the brittleness characteristics and main controlling factors of reservoir rocks were analyzed, and a comprehensive evaluation method was constructed. The study shows that the brittleness of rocks varies significantly across different layers; quartz and calcite promote brittleness, while clay minerals and porosity reduce brittleness; when porosity is greater than 10%, porosity is the main controlling factor (brittleness is generally low) and mineral composition is a secondary factor; when porosity is not greater than 10%, mineral composition is the main controlling factor and porosity has little influence. This study can provide an important basis for fracturing optimization design in low-permeability reservoirs.

Key words: low-permeability reservoir, brittleness, mineral composition, porosity, diagenesis, comprehensive evaluation

CLC Number:

TE135

FAN Tingen, FU Xiaofei, YANG Renfeng, YANG Erlong, WANG Sheng, PANG Shuyi. Evaluation method and influencing factors of brittleness characteristics in low-permeability sandstone reservoirs[J]. Special Oil & Gas Reservoirs, 2025, 32(6): 69-77.

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