摘要
目前,对沁水盆地太原组泥页岩储层孔隙的研究主要集中在海相页岩和陆相页岩,为深入研究海陆交互相泥页岩孔隙特征和地质控制因素,运用现代分析测试技术对该区泥页岩进行了测试分析。研究表明：研究区泥页岩孔隙度为1.19%~1.88%,孔隙结构以中孔为主,占总孔体积的58.43%~72.71%,其次为微孔体积,占16.37%~26.17%,宏孔体积占10.92%~24.31%,孔径主要分布为0.6~1.5、3.0~4.0、30 000.0~100 000.0 nm,比表面积主要是由孔径为0.6~1.5 nm的孔隙所提供;太原组泥页岩孔隙结构形态呈较开放状态,孔隙间连通性较好;泥页岩中存在有机质粒内孔、溶蚀孔、黏土矿物粒间孔和脆性矿物粒间孔等孔隙类型,此外还存在大量微裂缝。有机碳含量与微孔体积含量呈较好的正相关性,有机质成熟度与微孔、中孔含量有关,黏土矿物含量与中孔体积含量呈一定的正相关性,脆性矿物含量对宏孔体积贡献较大。该成果为研究区页岩气储层评价提供了基础资料,对海陆交互相页岩气勘探开发具有一定的参考价值。
The available researches on reservoir micro-pore structure of Taiyuan shale mainly focus on marine and continental shales. Taiyuan shale samples are tested by modern test and analysis technologies to further research on micro-pore structure and geology controlling factors of paralic shale.Research demonstrates that the shale porosity is 1. 19%-1. 88%. The reservoir space is dominated by meso-pore which accounts for 58. 43%-72. 71% of the total pore volume,followed by micro-pore with a ratio of 16. 37%-26. 17%,and the last one is macro-pore with a ratio of10. 92%-24. 31%. The pore-diameter distribution mainly includes 0. 6-1. 5,3. 0-4. 0 and 30 000. 0-100 000. 0 nm. Specific area is mainly contributed by pores with a diameter of 0. 6-1. 5 nm. The micro-pore structure of Taiyuan shale is relatively open with relatively high inter-pore connectivity. The shale reservoir space includes intragranular pore in organic matter,dissolved pore,intergranular pore in clay minerals,intergranular pore in brittle minerals and a large number of micro-cracks. There is a better positive correlation between organic carbon content and pore volume content,organic maturity is dependent on the contents of micro-pore and meso-pore,the content of clay minerals is positively correlated with the content of meso-pore,and the content of macro-pore is greatly dependent on the content of brittle minerals. This research could provide basic data for shale gas reservoir characterization in this region and provide a certain reference for paralic shale gas exploration and development.
出处
《特种油气藏》
CAS
CSCD
北大核心
2016年第2期41-44,152-153,共4页
Special Oil & Gas Reservoirs
基金
国家自然科学基金"中上扬子地区龙马溪组页岩微孔结构演变与页岩气成藏效应"(41272155)
国家基础研究发展"973"项目"中国南方古生界页岩气赋存富集机理和资源潜力评价"(2012CB214702)
中国矿业大学煤层气资源与成藏过程教育部重点实验室开放基金项目"沁水盆地煤系煤层气
页岩气和致密砂岩气赋存与成藏"(2015-004)联合资助
关键词
孔隙特征
影响因素
海陆交互相
太原组
沁水盆地南部
micro-pore structure
controlling factor
paralic facies
Taiyuan
southern Qinshui Basin
