天然气地球化学

青海东昆仑地区八宝山盆地烃源岩有机地球化学特征与页岩气勘探前景

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  • 1.青海省第四地质矿产勘查院,青海 西宁 810029;
    2.青海省地质调查局,青海 西宁 810001
贺领兄(1970-),女,青海西宁人,高级工程师,主要从事水工环、页岩气研究.E-mail:526037463@qq.com.

收稿日期: 2017-11-07

  修回日期: 2018-02-23

  网络出版日期: 2018-04-10

基金资助

青海省地质勘查基金“青海省都兰县八宝山地区页岩气资源调查评价项目”(编号:2016021011kc063);青海省重大科技专项“柴达木盆地南北缘成矿系统勘查开发示范项目”(编号:2016-SF-A3)联合资助.
 

Structural evolution and organic geochemical characteristics of source rocksin the Babaoshan Basin in eastern Kunlun area,Qinghai Province

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  • 1.Fourth Institute of Geological and Mineral Survey of Qinghai Province,Xining 810029,China;
    2.Qinghai Geological Survey,Xining 810001,China

Received date: 2017-11-07

  Revised date: 2018-02-23

  Online published: 2018-04-10

摘要

八宝山盆地上三叠统八宝山组为一套以陆相为主的碎屑岩和火山岩沉积,沉积岩中发育多层厚度不等的烃源岩。通过路线地质调查、钻孔施工及样品采集测试等工作,系统分析了八宝山盆地上三叠统八宝山组烃源岩的有机质丰度、类型、成熟度,结果表明:八宝山组烃源岩中暗色泥页岩有机碳含量(TOC)平均值为2.23%,属于好烃源岩;有机质类型属(腐殖型)Ⅲ型;有机质成熟阶段(RO)平均值为2.53%,其热演化程度为高成熟阶段,孔隙发育程度中等—较好,沉积环境为河流—湖泊相沉积体系。通过研究认为八宝山盆地上三叠统八宝山组具有良好的页岩气勘探前景。

本文引用格式

贺领兄,宋维刚,安生婷,徐永锋,沈娟,路超,王军 . 青海东昆仑地区八宝山盆地烃源岩有机地球化学特征与页岩气勘探前景[J]. 天然气地球科学, 2018 , 29(4) : 538 -549 . DOI: 10.11764/j.issn.1672-1926.2018.03.005

Abstract

The Upper Triassic Babaoshan Formation in the Babaoshan Basin is a set of terrestrial sedimentary rocks dominated by volcanics and clasolite.Multiple layers of source rocks with various thickness are developed in these sediments.Through the route geological survey,drilling and sampling testing system,this paper analyzes the abundance,type and maturity of organic matter of the source rocks of the Upper Permian Babaoshan Formation in the Babaoshan Basin.The results show that the average value of organic carbon content (TOC)of the dark shale is 2.23%,indicative of good source rock.The organic matter belongs to (humus)type Ⅲ kerogen.The thermal maturity (RO)is 2.53%,and it is at highly mature stage.The sedimentary environment is a fluvial lacustrine depositional system.Therefore,it is considered that the shale gas reservoirs have a good prospect in the Upper Triassic Babaoshan Formation.

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