| 木里盆地侏罗系煤层气主控因素及成藏模式 |
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| 作者姓名： | 田亚 杜治利 张文龙 陈夷 |
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| 作者单位： | 1.中国地质调查局油气资源调查中心,北京 100083; 2.青海煤炭地质一〇五勘探队,西宁 810001 |
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| 基金项目： | 中国地质调查局“武威-民乐盆地油气基础地质调查(编号: DD20160171)”“新疆塔里木、准噶尔外围油气战略选区调查(编号: DD20160203)”和“河西走廊盆地群油气资源战略选区调查(编号: 资[2015]XQ-2015-01-03)”项目联合资助 |
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| 摘 要： | 我国天然气需求逐年上升,寻找常规天然气的接替能源已迫在眉睫。木里盆地中-下侏罗统煤炭资源丰富,煤层厚度大,煤层气资源潜力巨大。综合利用野外地质调查、样品分析测试、煤炭钻井录井及含气量现场解吸,对木里盆地木里组煤层赋存特征、成藏地质条件、主控因素及煤层气成藏模式进行了研究,结果表明:木里盆地煤层厚度大,埋藏适中,以气煤和焦煤为主,整体处于中-高变质阶段,含气量较高,煤层气资源潜力良好;煤层的变质程度及顶、底板的封盖能力控制了煤层气的富集;木里盆地侏罗系煤层气主要有宽缓向斜富集和大型单斜构造富集2种成藏模式。煤层气主控因素分析及成藏模式研究为后续开展木里盆地的煤层气勘探开发提供了借鉴和依据。
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| 关 键 词： | 木里盆地 侏罗系 煤层气 成藏模式 |
| 收稿时间： | 2019-04-22 |
Main controlling factors and accumulation model of Jurassic coalbed methane in Muli Basin |
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| Authors: | TIAN Ya DU Zhili ZHANG Wenlong CHEN Yi |
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| Institution: | 1. Oil & Gas Survey, China Geological Survey, Beijing 100083, China; 2. Qinghai Bureau of Coal Geology 105 Team, Xining 810001, China |
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| Abstract: | The demand for natural gas is increasing yearly, therefore it is urgent to find an alternative energy for conventional natural gas. The Middle-Lower Jurassic in Muli Basin is rich in coal resources with thick coalbeds and huge coalbed methane potential. In this paper, field geological survey, sample analysis tests, drilling and logging data and gas content on-site analysis were used to study the occurrence characteristics, reservoir conditions, main controlling factors and coalbed methane accumulation models of Muli Formation in Muli Basin. The results show that the thickness of the coalbeds in Muli Basin is great, and the burial depth is moderate. The coalbeds are mainly composed of gas coal and coking coal and are in the middle-high metamorphism stage. Gas content in Muli Formation coal is relatively high. The potential of coalbed methane resources is good. The metamorphic degree of coalbeds and the sealing capacity of the top and bottom barriers control the enrichment of coalbed methane. The accumulation models of Jurassic coalbed methane in Muli Basin are mainly gentle syncline and large monoclinic structures. The research of these controlling factors and accumulation models will provide references and basis for further coalbed methane exploration and exploitation in Muli Basin. |
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| Keywords: | Muli Basin Jurassic coalbed methane accumulation model |
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