断裂-砂体-潜山复式天然气输导体系及成藏模式——以琼东南盆地深水区为例  

Composite fault-sand body-buried hill migration systems and accumulation models of natural gas:a case study of the deep-water area in Qiongdongnan Basin

作　　者：王耀华 甘军 梁刚 李兴 杨威[1,2] 高之业 熊书苓 WANG Yaohua;GAN Jun;LIANG Gang;LI Xing;YANG Wei;GAO Zhiye;XIONG Shuling(State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum,Beijing 102249,China;Unconventional Oil and Gas Science and Technology Institute,China University of Petroleum,Beijing 102249,China;Hainan Branch of CNOOC Ltd.,Haikou 570312,China)

机构地区：[1]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [2]中国石油大学(北京)非常规油气科学技术研究院,北京102249 [3]中海石油(中国)有限公司海南分公司,海南海口570312

出　　处：《断块油气田》2022年第3期319-324,共6页Fault-Block Oil & Gas Field

基　　金：中国石油大学(北京)优秀青年学者科研启动基金项目“陆相混积凝灰质页岩有机质生烃潜力的岩相学判识与元素活化迁移模式”(2462020QNXZ004);中海石油(中国)有限公司海南分公司企业委托类科研项目“永乐8区周缘油气运移模拟及成藏机制研究”(CCL2019ZJFN1155)。

摘　　要：通过设计“长砂体+半封闭断裂”、“烃源岩-潜山接触”与“短砂体+半封闭断裂”3类二维成藏物理模拟实验,剖析琼东南盆地松南-宝岛凹陷Y1构造带和Y5构造带天然气成藏主控因素,揭示其运聚过程,分别建立远源、近源2种成藏模式。实验结果表明:Y1构造带输导体系为“它源-断层-砂体复合型+砂体主导型”,天然气由陵水组砂岩储集体沿大型鼻状构造脊进行远距离侧向运移,于松南低凸起古潜山顶部聚集成藏;Y5构造带为“自源-断裂-砂体-古潜山风化壳型”复式天然气输导体系,崖城组烃源灶横向上直接与古潜山接触,天然气主要通过内部的压力释放向古潜山顶部风化壳直接充注。琼东南盆地松南-宝岛凹陷Y1构造带和Y5构造带输导体系及成藏模式的确立,对我国含油气盆地深水区环生烃凹陷“近源-远源天然气运聚成藏”模式的理论研究及有利区预测具有重要参考价值。By designing three types of 2D physical simulation experiments of reservoir formation,such as"long sand body+semi-sealed fault","directly contacting between source rock and buried hill"and"short sand body with semi-sealed fault",the main controlling factors of natural gas accumulation were explored to reveal the migration and accumulation process of Y1 structural belt and Y5 structural belt in Songnan to Baodao Sag of Qiongdongnan Basin.And far-source and near-source accumulation models were established respectively.The experimental results show that the migration system of Y1 structural belt is"allochthonous source-fault-sand body multiple type+sand body dominance type".The natural gas migrated laterally from the Lingshui Formation sandstone reservoir in the long distance along the large nose-like structural ridge,and then accumulated at the top of the buried hill of Songnan low-uplift.The Y5 structural belt is a composite migration system of"autochthonous source-fault-sand body-buried hill weathered crust".The source rock of Yacheng Formation is in contact with the buried hill laterally,and the natural gas is directly charged to the top of buried hill weathered crust caused by pressure release.The migration system and accumulation model established in the Y1 and Y5 structural belts of Songnan to Baodao Sag of Qiongdongnan Basin can provide the theoretical research references for the"near source and far source natural gas migration-accumulation model"and favorable areas prediction in the circular hydrocarbon generation sag in the deep-water area of petroliferous basins in China.

关 键 词：远距离侧向运移 古潜山 输导体系 运聚成藏模式 琼东南盆地 

分 类 号：TE121.1[石油与天然气工程—油气勘探]