游祖辉 1王纪扬 1赵建华 1蒲秀刚 2刘可禹 1张伟 2王志昊 1时战楠 2韩文中 2官全胜2
作者信息
- 1. 中国石油大学(华东)深层油气全国重点实验室,山东 青岛 266580||中国石油大学(华东)地球科学与技术学院,山东 青岛 266580
- 2. 中国石油 大港油田公司,天津 300280
- 折叠
摘要
Abstract
The 3rd member of the Shahejie Formation(Es3)in the Qibei Sub-sag,Huanghua Depression,Bohai Bay Basin holds enormous potential for shale oil exploration and exploitation.Using systematic experiments and analyses including core and thin section observations,scanning electron microscopy(SEM),X-ray diffraction(XRD),high-pressure mercury injection,total organic carbon(TOC)content analysis,and rock pyrolysis analysis,we explore the geological conditions and controlling factors for shale oil enrichment in the Es3(1).Six typical lithofacies of the Es3(1)are identified:laminated medium-grained calcareous-dolomitic shale,laminated fine-grained mixed shale,lamellar fine-grained mixed mudstone,lamellar medium-grained mixed mudstone,lamellar coarse-grained felsic mudstone,and massive medium-grained mixed mudstone.These mudstones/shales exhibit a TOC content ranging from 0.23%to 2.57%,with organic matter dominated by Types Ⅱ1 to Type Ⅲ kerogen.The Es3(1)shales display peak pyrolysis temperatures(Tmax)varying from 435℃to 463℃,indicating that these shales are generally in the mature stage of thermal evolution.Major reservoir space types identified in the study area include intergranular pores,intercrystalline pores,inter-clay-flake pores,intragranular dissolution pores,organic pores,and microfractures.Shale oil predominantly occurs in inter-clay-flake and dissolution pores with small pore-throats,as well as intercrystalline pores and microfractures,both with large pore throats.Major factors controlling shale oil enrichment in the Es3(1)include TOC content,organic matter type,reservoir type,and sedimentary structures,which together form microscopic source rock-reservoir assemblages.Among the various lithofacies,the laminated medium-grained calcareous-dolomitic shale,laminated fine-grained mixed shale,and the lamellar fine-grained mixed mudstone exhibit effective source rock-reservoir assemblages,establishing themselves as favorable lithofacies for shale oil enrichment in the study area.关键词
岩相类型/微观"源-储"组合/页岩油/沙河街组三段一亚段/歧北次凹/渤海湾盆地Key words
lithofacies type/microscopic source rock-reservoir assemblage/shale oil/1st sub-member of the 3rd member of the Shahejie Formation(Es3(1))/Qibei Sub-sag/Bohai Bay Basin分类
能源科技
