下扬子地区寒武系页岩气成藏条件分析与资源潜力评价

黄正清; 周道容; 李建青; 吴通; 徐菲菲

doi:10.11781/sysydz201901094

下扬子地区寒武系页岩气成藏条件分析与资源潜力评价

doi: 10.11781/sysydz201901094

1. 中国地质调查局南京地质调查中心, 南京 210016;
2. 山东科技大学, 山东青岛 266590

基金项目:

国家科技重大专项“下扬子地区寒武系页岩地球化学特征与含气性研究”（2016ZX05034001-003）资助。

详细信息

作者简介:
黄正清(1965-),男,高级工程师,从事页岩气基础地质研究。E-mail:rssfj@126.com。

中图分类号: TE132.2
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出版历程
- 收稿日期: 2018-09-19
- 修回日期: 2018-12-11
- 刊出日期: 2019-01-28

Shale gas accumulation conditions and resource potential evaluation of the Cambrian in the Lower Yangtze area

1. Nanjing Geological Survey Center, China Geological Survey, Nanjing, Jiangsu 210016, China;
2. Shandong University of Science and Technology, Qingdao, Shandong 266590, China

摘要

摘要: 下扬子地区寒武系为海相沉积地层，分布面积达13×10⁴ km²，其中下寒武统荷塘组（幕府山组）发育黑色碳质泥岩，厚度达276 m，有机碳含量为0.25%~23.52%，平均含量为4.54%，有机质类型以Ⅰ型为主，页岩气成藏条件十分有利。该区下寒武统地层经历了加里东、华力西、印支、燕山和喜马拉雅期的构造运动及岩浆活动的改造，个别地段已经成为变质岩的一部分；很多地区荷塘组碳质泥岩演化程度较高，镜质体反射率（R_o）最大可达6.32%，完全处于过成熟阶段。该区荷塘组上覆地层较厚，但受构造影响，荷塘组地层埋藏深度变化较大。综合荷塘组碳质泥岩的厚度、埋深、有机碳含量和镜质体反射率等4个方面的指标，开展了下扬子地区寒武系地层的页岩气地质调查和潜力评价，共划分出3个页岩气远景目标区，分布于江西上饶-浙江桐庐、江苏扬州和安徽全椒等地，估算资源量为288 944.4×10⁸ m³。
- 成藏条件 /
- 资源潜力 /
- 页岩气 /
- 荷塘组 /
- 寒武系 /
- 下扬子地区
Abstract: The Cambrian in the Lower Yangtze region is a marine sedimentary stratum with an area of 130×10³km². The Lower Cambrian Hetang Formation (Makufushan Formation) comprisesblack carbonaceous mudstones with a thickness of 276 m and an organic carbon content (TOC) rangingfrom 0.25%-23.52%, averaging 4.54%. The organic matter is mainly of type I, showing favorable conditions for shale gas accumulation. The Lower Cambrian stratum has experienced tectonic movements and transformation duringmagmatic activityduring the Caledonian, Hercynian, Indosinian, Yanshanian and Himalayan periods, and some individual sections have become part of metamorphic rocks. Therefore, the thermal evolution degree of carbonaceous mudstones is high in the Hetang Formation in many areas of the Lower Yangtze region. The maximum vitrinite reflectance (R_o) is 6.32%, indicating for an over mature stage. At the same time, due to large overburden and structural influence, the burial depth of the Hetang Formation also varies. The thickness, burial depth, TOC content and Ro of the carbonaceous mudstones in the Hetang Formation were applied to construct ageological survey and potential evaluation of shale gas in the Cambrian in the Lower Yangtze region. There are mainly three exploration targets including the region from the Shangrao area in the Jiangxi Province to the Tonglu area in the Zhejiang Province, the Yangzhou area in the Jiangsu Province and the Quanjiao area in the Anhui Province, with an estimated resource of 28894×10⁹m³.
- accumulation conditions /
- resource potential /
- shale gas /
- Hetang Formation /
- Cambrian /
- Lower Yangtze region

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