下扬子无为凹陷中三叠世周冲村组天然气成藏物质基础分析  被引量:12

Analysis on the gas reservoir forming conditions of Middle Triassic Zhouchongcun Formation in Wuwei depression,Lower Yangtze Basin

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作  者:吴通 李建青 章诚诚 邵威 方朝刚[1] 周道容 黄宁[1] WU Tong;LI Jian-qing;ZHANG Cheng-cheng;SHAO Wei;FANG Chao-gang;ZHOU Dao-rong;HUANG Ning(Nanjing Center,China Geological Survey,Nanjing 210016,China)

机构地区:[1]中国地质调查局南京地质调查中心,南京210016

出  处:《华东地质》2020年第4期425-433,共9页East China Geology

基  金:中国地质调查局“苏皖赣地区页岩油气战略选区调查(编号:DD20190565)”和“苏皖地区页岩气地质调查(编号:DD20190083)”项目联合资助。

摘  要:通过分析在下扬子沿江坳陷无为凹陷中三叠世周冲村组钻遇的天然气与潜在烃源岩、储集层和盖层的配置关系,结合无为凹陷皖为页1井钻测录井实测资料,研究中三叠世周冲村组天然气成藏的物质基础及有利因素。无为凹陷整体发育中—上二叠统及下三叠统2套有利烃源岩,具备良好的溶蚀孔-裂缝型白云岩储集层,上覆2套百米以上的石膏层是气藏封存的关键,多期构造运动形成的沟通型张裂缝和溶蚀孔对天然气的运移和储存具有促进作用,该区具有较好的常规天然气勘探前景。By analyzing the relationship between the newly-discovered gas that founded in Middle Trassic Zhougchongcun Fomartion in Wuwei depression,Lower Yangtze Basin and potential source rock,reservoir and cap rock properties,combining with subsurface geological and geophysical data,a further research on material basis and beneficial factors for gas reservior forming was conducted in this paper.The results show that two favorable source rocks,respectively Middle-Upper Permian and Lower Triassic,were deposited in the whole Wuwei depression,with beneficial dissolved pores-fracture dolomite reservoir.The two sets of gypsum beds over 100 meters are the key factors to seal gas reservoirs.The connective fractures and dissolved pores formed by the multi-stage tectonic movements have promoting effects on the migration and storage of natural gas.It is concluded that the favorable gas reservoir forming conditions have a good prospect for conventional gas exploration in this area.

关 键 词:无为凹陷 周冲村组 白云岩 石膏层 物质基础 

分 类 号:P618.13[天文地球—矿床学]

 

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