渤海湾盆地海域白垩系大中型火山岩油气藏形成条件  

Formation of large-and medium-sized Cretaceous volcanic reservoirs in the offshore Bohai Bay Basin,East China

作　　者：徐长贵 张功成 黄胜兵 单玄龙[3,4] 李嘉慧 XU Changgui;ZHANG Gongcheng;HUANG Shengbing;SHAN Xuanlong;LI Jiahui(China National Off shore Oil Corporation,Beijing 100010,China;CNOOC Research Institute Co.Ltd.,Beijing 100028,China;College of Earth Sciences,Jilin University,Changchun 130061,China;International Cooperation Joint Laboratory of Future Science,Jilin University,Changchun 130061,China)

机构地区：[1]中国海洋石油集团有限公司,北京100010 [2]中海油研究总院有限责任公司,北京100028 [3]吉林大学地球科学学院,长春130061 [4]吉林大学未来科学国际合作联合实验室,长春130061

出　　处：《石油勘探与开发》2024年第3期467-477,共11页Petroleum Exploration and Development

基　　金：中国海洋石油集团有限公司项目“中国近海盆地潜在富油凹陷资源潜力、成藏机制与突破方向”(2021-KT-YXKY-03)。

摘　　要：基于渤海湾盆地海域中生界油气勘探取得的地质和地球物理资料,以2019年以来发现的火山岩高产工业油气井为依据,系统总结渤海海域白垩系大中型火山岩油气藏的形成条件。研究表明,渤海海域中生界大型中酸性熔岩火山机构和中酸性熔岩复合火山机构是规模性火山岩储层形成的物质基础,火山口-近源相带中发育的溢流相上部亚相和火山通道相隐爆角砾岩亚相是规模性储层的有利发育部位。高孔-中低渗型和中孔-中低渗型两种类型有效储层是大中型火山岩油气藏形成的关键条件,高孔-中低渗型储层由中酸性气孔熔岩或隐爆角砾岩叠加强烈溶蚀作用形成,中孔-中低渗型储层由强烈构造作用叠加流体溶蚀形成。风化作用和构造改造是该区大中型火山岩油气藏的主要成储机制。源内低位“源-储披覆对接型”是该区大中型火山岩油气藏形成的最佳源-储配置关系。渤中凹陷周缘具备有利火山岩相、有效储层和“源-储披覆对接”等有利因素,靠近走滑断裂及其分支断裂的大型中酸性熔岩和复合火山机构是未来勘探的主要地区。Based on the geological and geophysical data of Mesozoic oil-gas exploration in the sea area of Bohai Bay Basin and the discovered high-yield volcanic oil and gas wells since 2019,this paper methodically summarizes the formation conditions of large-and medium-sized Cretaceous volcanic oil and gas reservoirs in the Bohai Sea.Research shows that the Mesozoic large intermediate-felsic lava and intermediate-felsic composite volcanic edifices in the Bohai Sea are the material basis for the formation of large-scale volcanic reservoirs.The upper subfacies of effusive facies and cryptoexplosive breccia subfacies of volcanic conduit facies of volcanic vent-proximal facies belts are favorable for large-scale volcanic reservoir formation.Two types of efficient reservoirs,characterized by high porosity and medium to low permeability,as well as medium porosity and medium to low permeability,are the core of the formation of large-and medium-sized volcanic reservoirs.The reservoir with high porosity and medium to low permeability is formed by intermediate-felsic vesicular lava or the cryptoexplosive breccia superimposed by intensive dissolution.The reservoir with medium porosity and medium to low permeability is formed by intense tectonism superimposed by fluid dissolution.Weathering and tectonic transformation are main formation mechanisms for large and medium-sized volcanic reservoirs in the study area.The“source-reservoir draping type”at the low source is the optimum source-reservoir configuration relationship for large-and medium-sized volcanic reservoirs.There exists favorable volcanic facies,efficient reservoirs and source-reservoir draping configuration relationship on the periphery of Bozhong Sag,and the large intermediate-felsic lava and intermediate-felsic composite volcanic edifices close to strike-slip faults and their branch faults are the main directions of future exploration.

关 键 词：渤海海域 白垩系 大中型火山岩油气藏 有效储层 源-储配置 勘探方向 

分 类 号：TE122.2[石油与天然气工程—油气勘探]