摘要
近年来渤海海域取得了以渤中19-6大型凝析气田为代表的潜山油气新发现,展示了进一步在潜山寻找规模油气的良好前景。以迄今已发现的潜山油气藏分析为基础,从优质储层发育、供烃有效性和油气保存三大关键成藏要素入手,系统剖析了渤海海域潜山油气藏形成条件。研究表明,优势岩性和岩相是储层发育的前提,多期次多元流体溶蚀和应力叠加是形成优质储集层的关键;富烃凹陷潜山油气来源更充足,能否成藏取决于“源-储”匹配关系;潜山油气聚集规模和流体性质与优质盖层有关,是形成大中型轻质油田和天然气田的必要条件。在此基础上,建立了3种潜山油气富集模式,即低位“溶缝体-源内强供-高压厚盖”天然气富集型、中位“缝溶体-源外强供-中压中厚盖”原油富集型以及中、低位“缝网体-源内强供-中高压厚盖”油气富集型,指出了该地区潜山下一步勘探的有利方向。
In recent years,new discoveries of buried hill oil and gas,represented by BZ 19-6 large-scale condensate gas field,have been made in Bohai sea area,showing a good prospect for further exploration of large-scale oil and gas in buried hill.Based on the analysis of buried hill reservoirs discovered so far,the formation conditions of buried hill reservoirs in Bohai Sea area are systematically analyzed from three key reservoir forming factors high quality reservoir development,hydrocarbon supply effectiveness and hydrocarbon preservation.The results show that the dominant lithology and lithofacies are the premise of reservoir development,and multi-stage multi-fluid dissolution and stress superposition are the key to the formation of high-quality reservoir;The hydrocarbon source of a buried hill in hydrocarbon rich sag is abundant,and whether it can form a reservoir or not depends on the“source-reservoir”matching relationship;The hydrocarbon accumulation scale and fluid properties of buried hills are related to high quality caprocks,which are necessary conditions for the formation of large and medium-sized light oil fields and natural gas fields.On this basis,three oil and gas enrichment modes of buried hills are established,i.e.low position“dissolved fracture body-rich supply in source rocks-high pressure thick caprocks”natural gas enrichment mode,medium position“fracture-vug body-rich supply outside source rocks-medium pressure medium-thick caprocks”crude oil enrichment mode,and medium and low position“fracture-network body-rich supply in source rocks-medium to high pressure thick caprocks”oil and gas enrichment mode,showing a favorable direction for further exploration of buried hills in this area.
作者
王粤川
于海波
彭靖淞
陈心路
孙哲
史梦琪
WANG Yuechuan;YU Haibo;PENG Jingsong;CHEN Xinlu;SUN Zhe;SHI Mengqi(CNOOC China Limited, Tianjin Branch, Tianjin 300459, China)
出处
《中国海上油气》
CAS
CSCD
北大核心
2021年第3期28-38,共11页
China Offshore Oil and Gas
基金
“十三五”国家科技重大专项“渤海海域勘探新领域及关键技术研究(编号:2016ZX05024-003)”
中海石油(中国)有限公司重大科技专项课题“渤海油田上产4000万吨新领域勘探关键技术(编号:CNOOC-KJ 135 ZDXM 36 TJ 08 TJ)”部分研究成果。
关键词
渤海海域
潜山
优质储层
供烃条件
超压盖层
富集模式
勘探方向
Bohai sea area
buried hill
high quality reservoir
hydrocarbon supply conditions
overpressured caprock
enrichment modes
exploration direction
