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海相页岩气勘探甜点的有机质微观标志
Microcosmic biomarker of organic matter in sweet spots from marine shale gas
张 慧1 袁立颖1 张燕茹2 焦淑静2 林伯伟1 杨庆龙1
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DOI:10.12055/gaskk.issn.1673-3177.2019.03.006
作者单位:1. SGS 通标标准技术服务有限公司/ 矿产部 2. 中国石油大学(北京)
中文关键字:页岩气 勘探甜点 显微组分 微观标志 南方下古生界
英文关键字:Shale gas; Sweet spot; Maceral; Microcosmic biomarker; Lower Paleozoic in southern China
中文摘要:在场发射扫描电镜下,对南方诸多省(市)下古生界海相页岩有机质进行有机岩石学、地球化学、储层学等多方面的观测研究。较广泛和大量样品的测试结果表明,五峰组-龙马溪组、下寒武统两套海相黑色页岩中的有机显微组分主要是沥青质体,其化学成分以碳主硅多为特征,赋存状态有条带状、交互状、散块状、互裹状等。沥青质体与自生矿物(石英为主)交互共生,形成嵌晶结构、包含结构、环带结构等,二者在很大程度上同源于生烃母质,具有化学分异的成因关系。沥青质体发育纳米级沥青球粒孔、气孔、铸模孔,这些孔隙是有机质生气、聚气的直接见证。由此为寻找页岩气勘探甜点提炼出3 个有机质微观标志:①页岩有机显微组分以沥青质体为主;②有机质与自生矿物交互共生;③有机质纳米孔隙发育程度高。这些微观标志可作为宏观标志的补充和印证。
英文摘要:Organic matter in the Lower Paleozoic marine shale distributed at many provinces or cities of southern China was studied through field emission scanning electron microscopy (FESEM) from aspects of organic petrology, geochemistry, and reservoir. After some analysis on a large number of shale samples, it’s found that organic macerals in marine black shale of both Wufeng-Longmaxi formation and Lower Cambrian are mainly bituminite with rich carbon and silicon, and the occurrence states of samples are in the shape of band, alternation, scattered bulk, and mutual envelope. Bituminite and authigenic mineral (dominantly quartz) are in the pattern of intergrowth to form poikilitic texture, and inclusion and ring structures, and both of them are largely cognate to kerogen and have genetic relationship of chemical differentiation. There are nano-scale bitumine pellet, gas, and mould pores developed in bituminite, providing a direct evidence for gas generation and accumulation of organic matter. In order to discovery some sweet spots from
shale-gas exploration, 3 microcosmic biomarkers of organic matter were presented as follows, (1) organic macerals are dominantly by bituminite; (2) organic matter and authigenic mineral are in the pattern of intergrowth; and (3) there are nano-scale pores extremely developed in organic matter. These microcosmic biomarkers can be used as the supplement and verification of macrocosmic ones
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国内统一连续出版物号:CN51-1159/TE |国内发行代码: |国际标准出版物号:ISSN1673-3177 |国际发行代码:
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