常宇,刘明洁,张庄,叶素娟,杨映涛,伍玲,张玲,南红丽,谭秀成,曾伟,连承波

• 1:西南石油大学天然气地质四川省重点实验室
• 2:西南石油大学地球科学与技术学院
• 3:中国石化西南油气分公司勘探开发研究院

摘要(Abstract)：

为了明确川西坳陷须三段砂岩储层致密化过程，定量恢复致密砂岩储层孔隙度演化，综合利用常规薄片、铸体薄片、扫描电镜和包裹体等资料，对须三段成岩作用进行了系统分析，探讨了成岩作用与孔隙度演化之间的关系。在此基础上，结合地层埋藏史和热演化史研究，基于效应模拟原则，即不对具体成岩作用进行模拟，而是通过地质参数来模拟各种成岩作用的综合叠加结果，从而建立须三段砂岩孔隙度演化数学模型，明确砂岩储层致密化过程。研究结果表明：须三段主要发育岩屑石英砂岩和岩屑砂岩；砂岩经历压实、胶结、溶蚀等成岩作用，其中压实作用和胶结作用是主要的破坏性成岩作用，且一直存在于砂岩储层演化过程中；溶蚀作用是主要的建设性成岩作用，且只出现在特定的60～120℃温度窗口。基于对现今砂岩孔隙度与深度关系的观察，明确砂岩先后经历了压实、胶结作用和溶蚀作用，以及溶蚀后的压实、胶结作用。因此，可将孔隙度演化划分为正常压实与胶结阶段、溶蚀增孔阶段和溶蚀后正常压实与胶结3个阶段。此外，将孔隙度演化分解为孔隙度减小模型和孔隙度增大模型，这2种模型在孔隙度演化的3个阶段分别叠加，可得到模拟孔隙度演化的三段式分段函数模型，进而实现砂岩储层孔隙度演化过程模拟。通过应用该模型对典型砂岩储层孔隙度演化过程的模拟表明，川西坳陷须三段因压实作用和早期胶结作用影响，具有早期致密的特点。

关键词(KeyWords)： 致密砂岩;储层成岩作用;效应模拟;孔隙度演化;须三段;川西坳陷

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(41872154);; 中国博士后科学基金(2016M600752);; 中国石化科技部项目(P20061-3)

作者(Author): 常宇,刘明洁,张庄,叶素娟,杨映涛,伍玲,张玲,南红丽,谭秀成,曾伟,连承波

DOI: 10.19509/j.cnki.dzkq.2022.0177

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