黔南坳陷下石炭统摆佐组暗色页岩热演化与生烃史研究

宋颖睿; 侯宇光; 刘宇坤; 何生; 范志伟; 梁雅琪

doi:10.11781/sysydz201802226

黔南坳陷下石炭统摆佐组暗色页岩热演化与生烃史研究

doi: 10.11781/sysydz201802226

1.
中国地质大学构造与油气资源教育部重点实验室, 武汉 430074
2. 中国石化勘探分公司, 成都 610041
3. 湖北省地质实验测试中心, 武汉 430034

基金项目: 国家自然科学基金项目（41772143，41302111）、“十三五”国家科技重大专项（2016ZX05034002-003）和政府间国际科技创新合作重点专项“中美石炭—二叠系页岩储层评价技术合作研究”（2017YFE0106300）资助。

详细信息

作者简介:
宋颖睿(1996-),女,从事页岩油气地质评价、石油地质方面的研究。E-mail:1996syr@sina.com。

通讯作者:
侯宇光(1979-),男,副教授,从事油气成藏、非常规油气地质方面的研究和教学工作。E-mail:sporthyg@126.com。

中图分类号: TE122.113
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出版历程
- 收稿日期: 2017-07-03
- 修回日期: 2018-01-30
- 刊出日期: 2018-03-28

Thermal evolution and hydrocarbon generation histories of black shale in Lower Carboniferous Baizuo Formation, Southern Guizhou Depression

1.
Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences(Wuhan), Wuhan, Hubei 430074, China
2. SINOPEC Petroleum Exploration Branch Company, Chengdu, Sichuan 610041, China
3. Geological Experimental Testing Center of Hubei Province, Wuhan, Hubei 430034, China

摘要

摘要: 为了对黔南坳陷下石炭统摆佐组暗色页岩的生烃能力进行评估，利用油气地质、地球化学资料分析以及含油气系统模拟技术等方法，对其热演化-成熟历史和生烃演化的过程进行了重建。研究表明：摆佐组页岩具有较高的有机质丰度和较低的生烃潜量，有机质类型主要为Ⅱ₂型，已经达到高-过成熟阶段；摆佐组页岩从中石炭世（约312 Ma）开始进入生烃门限，在早三叠世（约238 Ma）进入过成熟阶段，在早侏罗世（约196 Ma）达到最大埋深9 000 m，最高温度约为200℃；摆佐组页岩分别在二叠纪中期（291~270 Ma）和三叠纪后期（262~208 Ma）达到生油和生气高峰；高演化背景下的油裂解气过程，可为摆佐组页岩气的富集提供充足的甲烷气和存储空间，然而196 Ma以来的构造抬升剥蚀对页岩气的保存具有一定的破坏作用。
- 热演化 /
- 生烃能力 /
- 页岩气 /
- 下石炭统 /
- 黔南坳陷
Abstract: The thermal evolution and hydrocarbon generation histories of the Lower Carboniferous Baizuo Formation in the Southern Guizhou Depression were studied with petroleum geology, geochemical data and petroleum system simulation in order to evaluate the hydrocarbon generation potential of black shale. Results showed that the black shale of the Baizuo Formation has relatively high organic matter abundance and low hydrocarbon potential. The organic matter in the black shale is mainly of type Ⅱ₂, and has reached the high-maturity and over-mature stages. The black shale entered the threshold of hydrocarbon generation during the Middle Carboniferous (about 312 Ma) and the mature stage in the early Triassic (about 238 Ma), and reached the maximum burial depth (about 9 000 m) in the early Jurassic (196 Ma), with a maximum temperature of about 200℃. They reached the oil generation peak in the Middle Permian (291-270 Ma) and the gas generation peak in the Late Triassic (262-208 Ma), respectively. The process of oil cracking to gas during the high thermal evolution provided sufficient methane gas and storage space for shale gas enrichment. However, tectonic uplift and erosion since 196 Ma had a certain destructive influence on shale gas enrichment.
- thermal evolution /
- hydrocarbon generation capacity /
- shale gas /
- Lower Carboniferous /
- Southern Guizhou Depression

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