低渗砂岩储层脆性特征评价方法及影响因素分析

doi:10.3969/j.issn.1006-6535.2025.06.008

摘要/Abstract

摘要： 针对低渗砂岩储层脆性特征及影响因素不明,制约压裂优化设计的问题,以珠江口盆地文昌组与渤海湾盆地沙三段低渗砂岩储层岩心为研究对象,运用峰值后能量守恒原理,分析储层岩石脆性特征及主控因素,构建综合评价方法。研究表明:不同层位岩石脆性差异显著;石英、方解石促进脆性,黏土矿物与孔隙度则削弱脆性;当孔隙度大于10%时,孔隙度为主控因素(脆性普遍偏低),矿物组分为次要因素;当孔隙度小于10% 时,矿物组分为主控因素,孔隙度影响较小。该研究可为低渗储层压裂优化设计提供重要依据。

关键词: 低渗储层, 脆性, 矿物组分, 孔隙度, 成岩作用, 综合评价

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

中图分类号:

TE135

范廷恩, 付晓飞, 杨仁锋, 杨二龙, 王升, 逄淑伊. 低渗砂岩储层脆性特征评价方法及影响因素分析[J]. 特种油气藏, 2025, 32(6): 69-77.

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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