页岩储层基质孔隙连通性及其定量评价方法

项目名称： 页岩储层基质孔隙连通性及其定量评价方法

项目编号： No.41502125

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 天文学、地球科学

项目作者： 高之业

作者单位： 中国石油大学（北京）

项目金额： 21万元

中文摘要： 页岩储层基质孔隙连通性直接影响页岩气在储层内的运移，从而控制页岩气的长期供气能力。目前页岩储层基质孔隙连通性研究还不够深入，页岩储层基质孔隙连通性主控因素不清，同时缺乏定量化评价方法。项目以我国典型海相和陆相页岩为研究对象，针对页岩储层基质孔隙连通性及其定量评价这一科学问题，利用岩石学和地球化学方法精细刻画页岩储层非均质性特征，采用场发射扫描电镜（FE-SEM）等直接成像法和氮气吸附法等流体注入法表征页岩储层微观孔隙结构，包括孔隙形貌、大小、分布以及连通状态，明确页岩储层基质孔隙连通性主控因素；参照已有孔隙结构简化模型，并结合页岩储层非均质性特征和基质孔隙连通性特征，建立适应页岩非均质性的基质孔隙结构简化模型；利用自发渗吸法和高压压汞法来定量评价页岩储层基质孔隙连通性。成果对于完善页岩储层评价体系及页岩气有利区优选具有重要的意义。

中文关键词： 页岩气；基质孔隙连通性；定量评价；自发渗吸；高压压汞

英文摘要： The pore connectivity of shale matrix has a significant impact on shale gas migration and the long-term gas supply of shale gas wells. However, the investigations on pore connectivity of shale matrix is limited and many questions are still existing, such as the factors controlling pore connectivity of shale matrix is still unknown, the evaluation of pore connectivity of shale matrix is mainly qualitative lacking of quantitative evaluation methods. As a result, many more researches focusing on pore connectivity of shale matrix are required to clarify these questions. Using representative marine and continental shale samples from China, this project will focus on the pore connectivity of shale matrix and develop quantitative evaluation methods. Multiple approaches will be applied to characterize the pore structure of shale and clarify the controlling factors of pore connectivity of shale matrix, including FE-SEM、FIB-SEM、QEMSCAN、N2 adsorption and so on. A new pore structure model of shale matrix will be established to accommodate shale heterogeneity. Spontaneous imbibition and high pressure mercury intrusion porosimetry will be used to quantitatively evaluate the pore connectivity of shale matrix. The outcomes of this project will enrich the evaluation system of shale gas reservoirs and play an important role in searching for potential shale gas reservoirs in China.

英文关键词： shale gas;pore connectivity of shale matrix;quantitative evaluation;spontaneous imbibition;high pressure mercury intrusion porosimetry