河南理工大学学报（自然科学版）2017，Vol.36Issue(4)：32-41,10.
渝东南龙马溪组下部页岩岩石学特征与优质储层形成机理
Petrographic characteristics of lower Longmaxi Formation shale in South-east Chongqing and the formation mechanism of high quality reservoir
摘要
Abstract
Shale samples from lower Longmaxi Formation in Qijiang,Sanquan,Shizhu and Fuling in South-east Chongqing were selected for the study.Based on the analysis of the X-ray diffraction,TOC,brittleness test,high pressure mercury injection and low temperature nitrogen adsorption,the petrographic characteristics including mineral composition,organic characteristics,pore characteristics and brittleness of shale reservoir were studied.The perspect of reservoir petrology was evaluated and the influences of petrological characteristics on the formation mechaism of high-quality reservoirs were discussed.The results showed that mineral compositions of Longmaxi Formation shale reservoir can be divided into brittle minerals of quartz and clay minerals of illite.The content of brittle minerals at the bottom was significantly higher.The average value of TOC content is above 2% and the organic matter is over mature.The type of pores are complex and various types of pore were identified including organic nano pores,flake pores in clay mineral,dissolution pores in matrix mineral,and intergranular pores in framboidal pyrite.The main specific surface area and reservoir space were contributed by the nanoscale pores and the morpholohy characteristics of pores are sophisticated with various shapes such as parallel-plate size etc.The mechanics brittleness is good and the brittleness index is favorable for microfractures in reservoir and artificial fracturing.The lower Longmaxi Formation reservoir is high quality reservoir with special petrological characteristics which is formed in deep shelf and has experienced the late diagenesis stage,and therefore have suitable mineral compositions with developed nanopores,microfractures and good mechanics brittleness.Shale reservoir material compositions are the basis for the formation of high quality reservoir.The study is significance to explore the formation mechanism of physical characteristics and its control factors from the angle of the petrological characteristics in reservoir research.关键词
页岩储层/龙马溪组/岩石学特征/孔隙/储层形成机理Key words
shale reservoir/Longmaxi Formation/petrography/pore/reservoir formation mechanism分类
天文与地球科学引用本文复制引用
赵迪斐,郭英海,毛潇潇,张敬霞,白万备,李刚..渝东南龙马溪组下部页岩岩石学特征与优质储层形成机理[J].河南理工大学学报（自然科学版）,2017,36(4):32-41,10.基金项目
国家重点基础研究发展计划(973)项目(2012CB214702) （973）
煤层气资源与成藏过程教育部重点实验室(中国矿业大学)开放基金资助项目(2015-007) （中国矿业大学）
中国矿业大学大学生创新训练项目(201560) （201560）
