渤海湾盆地渤海海域油气成藏富集新认识与大型油气田发现  

New recognition of hydrocarbon accumulation and enrichment and discovery of large-scale oil and gas fields in Bohai Sea area,Bohai Bay Basin

作　　者：薛永安 杨海风 黄志 徐春强 许鹏 李龙 Xue Yong’an;Yang Haifeng;Huang Zhi;Xu Chunqiang;Xu Peng;Li Long(Tianjin Branch of CNOOC(China)Co.,Ltd.)

机构地区：[1]中海石油(中国)有限公司天津分公司

出　　处：《中国石油勘探》2025年第1期58-69,共12页China Petroleum Exploration

基　　金：中国海洋石油集团有限公司“十四五”重大科技项目“潜山油气成藏理论与勘探关键技术”(KJGG2022-0302)。

摘　　要：针对渤海湾盆地渤海海域规模性构造圈闭钻探殆尽、在产油田资源接替不足的挑战,近20年间利用丰富的地质、钻井、化验和地震资料,在浅层新近系和深层潜山勘探领域进行持续攻关,分别形成了“汇聚脊”控藏和“湖盆成气”地质新认识。“汇聚脊”控藏认识核心包括:(1)“汇聚脊”与断层配置控制源外油气差异富集;(2)浅层疏松砂岩发育“枝蔓式”大型岩性圈闭;(3)构造弱活动控制的隐性断裂形成大规模“隐性”圈闭。“湖盆成气”认识内涵为:(1)渤中凹陷晚期快速沉降控制沙河街组烃源岩爆发式生气;(2)构造应力主导太古宇花岗岩潜山双层立体成储;(3)超压动力封闭背景下早油晚气快速强充注动态成藏。上述认识指导发现了垦利10-2、渤中19-6等18个大中型优质高产油气田,实现了渤海海域原油向隐蔽型油藏勘探方向的战略转移,同时在油型盆地实现了大气田的战略突破。In response to the challenges of almost all large-sized structural traps discovered and insufficient resource replacement of production oil fields in Bohai Bay Basin,in the past 20 years,continuous research has been conducted in exploration fields of the shallow Neogene and deep buried hills using abundant geological,well drilling,laboratory test and seismic data,forming new geological understanding of hydrocarbon accumulation controlled by“convergence ridge”and“gas generation in lake basin”,respectively.The core of hydrocarbon accumulation controlled by“convergence ridge”includes:(1)The configuration between“convergence ridge”and fault controlled the differential hydrocarbon enrichment outside source rock;(2)The“dendritic”type large-scale lithologic traps were developed in shallow loose sandstone;(3)The concealed faults controlled by weak tectonic activity enabled to form large-scale“concealed”traps.The main connotation of“gas generation in lake basin”refers to:(1)The late rapid subsidence of Bozhong Sag caused explosive gas generation of Shahejie Formation source rock;(2)The tectonic stress controlled the development of double-layer stereoscopic reservoirs in the Archeozoic granite buried hills;(3)The rapid and high-intensity charging of early oil and late gas and dynamic accumulation occurred under the background of overpressure dynamic sealing.The above understanding has guided the discovery of 18 large and medium-sized high-yield oil and gas fields such as KL10-2 and BZ19-6,which not only facilitates the strategic shift of oil exploration towards hidden oil reservoirs in Bohai Sea area,but also achieves the strategic breakthrough in large gas fields in oil-type basin.

关 键 词：渤海湾盆地 渤海海域 汇聚脊 湖盆成气 大油气田 勘探方向 

分 类 号：TE111.1[石油与天然气工程—油气勘探]