地质与资源2023，Vol.32Issue(6)：750-761,12.DOI:10.13686/j.cnki.dzyzy.2023.06.012
潜江凹陷页岩岩相对页岩油储层的控制作用
CONTROL OF SHALE LITHOFACIES ON THE SHALE OIL RESERVOIR IN QIANJIANG SAG
摘要
Abstract
The rock mineral compositions,porosity-permeability,pore structure and geochemical characteristics of the shale reservoir of Qianjiang Formation in Qianjiang Sag,Jianghan Basin,are studied on the basis of core observation and rock slice identification,combined with XRD technology,argon ion polishing scanning electron microscopy,low temperature nitrogen adsorption experiment,high pressure Hg injection test and rock pyrolysis analysis.The results show that the shale of Qianjiang Formation is mainly composed of dolomite and clay minerals,developed with massive calcareous mudstone facies,laminated calcareous mudstone facies,massive dolomitic mudstone facies,laminated dolomitic mudstone facies,massive argillaceous dolomite facies and laminated argillaceous dolomite facies.The carbonate mineral intercrystalline pores and clay mineral interlayer pores are mainly developed in the shale reservoir,with the pore size of 2-200 nm,the porosity mostly lower than 20％,and the permeability of 0.1 × 103-100× 10-3μm2,belonging to low porosity and low-extra low permeability reservoir.Clay minerals are conducive to the development of micropores and mesopores in shale reservoirs,while the dolomites contribute to the development of macropores,and biogenic dolomites help the accumulation of organic carbon and occurrence of residual hydrocarbon.Generally,the laminated shale has higher pore size,better pore connectivity and oil content than the massive shale dose.Especially the laminated argillaceous dolomite facies,with porosity of 5％-15％,permeability of 1×10-3-10×10-3 μm2,main pore size of 50-200 nm,connected pore size of 50-100 nm,TOC content of 1％-3％,S1 content of 5×10-3-35×10-3 and OSI value mostly 400×10-3,is the dominant lithofacies of shale oil reservoir in Qianjiang Formation.关键词
页岩油储层/孔隙结构/页岩岩相/潜江组/潜江凹陷/江汉盆地Key words
shale oil reservoir/pore structure/shale facies/Qianjiang Formation/Qianjiang Sag/Jianghan Basin分类
天文与地球科学引用本文复制引用
云念寒,王芙蓉,侯宇光,曾宏斌,杨荣岩..潜江凹陷页岩岩相对页岩油储层的控制作用[J].地质与资源,2023,32(6):750-761,12.基金项目
国家自然科学基金委员会重点项目"陆相页岩油在基质-裂缝体系中的多尺度运移机理研究"(41830431) （41830431）
国家自然科学基金项目"有机质石墨化对南方下古生界海相页岩有机质孔隙结构的影响"(41772143) （41772143）
科学技术部重大专项资助项目"潜江与泌阳凹陷页岩油勘探开发目标评价"(2017ZX05049-005). （2017ZX05049-005）
