湖相烃源岩演化全过程中的孔隙演化机理——基于地质样品与模拟实验的认识

Pore development in lacustrine source rock evolution: interpretation based on geological samples and simulation experiments: interpretation based on geological samples and simulation experiments

黄振凯 黎茂稳 郑伦举 陶国亮 李志明 蒋启贵 钱门辉 曹婷婷 李双建 沃玉进 孙冬胜

HUANG Zhenkai LI Maowen ZHENG Lunju TAO Guoliang LI Zhiming JIANG Qigui QIAN Menhui CAO Tingting LI Shuangjian WO Yujin SUN Dongsheng

页岩油气富集机理与有效开发国家重点实验室, 北京 100083 中国石化 石油勘探开发研究院, 北京 100083 中国石化 石油勘探开发研究院 无锡石油地质研究所, 江苏 无锡 214126

State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 100083, China SINOPEC Petroleum Exploration and Production Research Institute, Beijing 100083, China Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China

通过对比实际自然演化剖面地质样品和模拟实验样品的孔隙定量结果，认为烃源岩演化的整个过程中，不同尺度孔隙的孔容变化规律基本相似。大孔和介孔对孔隙变化的影响较大，二者应该是岩石总孔隙度的主要贡献者，且不同尺寸孔隙之间存在一定的转化关系。成岩演化、构造变化等作用是导致孔隙变化的主要外部因素，生烃—排烃过程是内在因素。处于不同演化阶段的烃源岩形成的烃类产物所赋存的孔隙空间及大小（规模）存在一定差异，该认识有助于明确泥页岩层系中不同演化阶段对应的常规与非常规油气资源的赋存机理。

By comparing the quantitative pore results of geological samples from natural evolution profiles and simulated experiment samples, it is believed that the volume changes of pores of different scales are basically similar throughout the evolution of source rocks. Macropores and mesopores have a greater impact on pore changes. They should be the main contributors to the total porosity of rocks, and there is a certain conversion relationship between pores of different sizes. Diagenetic evolution and tectonic changes are the main external factors that cause pore changes while hydrocarbon generation and expulsion processes are the internal factors. In addition, there are some differences in the pore space and size (scale) of hydrocarbon products formed by source rocks during different evolutionary stages. This is useful for determining the storage mechanism of conventional and unconventional oil and gas resources corresponding to different evolutionary stages in the shale formation.

国家自然科学基金 41702137;中国科学院A类战略性先导科技专项 XDA14010406;国家自然科学基金企业创新发展联合基金项目 U19B6003-01-03

https://doi.org/10.11781/sysydz202004639