摘要
渤海湾盆地束鹿凹陷隐蔽型潜山具有圈闭识别难度大、成藏条件不清的问题,导致潜山勘探多年无法取得显著进展,亟需重新梳理勘探思路。以地质模式为导向,处理-解释一体化攻关,针对束鹿凹陷西斜坡下古生界碳酸盐岩高阻抗岩性体覆盖区潜山的识别,进一步深化西部斜坡带断裂解释和潜山成藏条件认识,构思了“断槽-冲蚀沟侧向遮挡”新型潜山成藏新模式。研究表明:针对局部目标攻关处理,应用速度模拟识别潜山顶面,采用各向异性叠前深度偏移技术提高了潜山内幕成像质量;低通滤波处理后,其内幕断层断点更加清晰,在斜坡带潜山顶面新发现断层50多条,发现和落实奥陶系有利圈闭30多个,圈闭面积增加近20 km^(2),JG21x等多口井在潜山获得高产油流;新的成藏模式打破了早期凹陷西斜坡带潜山为勘探空白区的认识,新型潜山油藏埋藏浅、产量高,成为华北探区效益新勘探有利区。通过地震资料处理、解释一体化攻关,得到高质量地震资料,在新地质模式指导下构思新型潜山成藏模式,这一勘探思路对高成熟探区的潜山勘探具有重要借鉴意义。
[Objective]The hidden buried-hills in the Shulu Sag of the Bohai Bay Basin face challenges such as difficult trap identification and unclear reservoir conditions,leading to limited progress in buried-hill exploration over recent years.Consequently,it is essential to reorganize the exploration strategies.[Methods]This study is guided by geological modeling and emphasizes the integration of seismic processing and interpretation.The aim is to deepen the understanding of fault interpretation and reservoir formation conditions within the coverage area of the Lower Paleozoic carbonate rocks on the western slope of the Shulu Sag.A new model of buried-hill reservoir formation,termed"fault trough erosion ditch lateral obstruction"is proposed.[Results]The research demonstrates that processing,including velocity simulation,effectively identifies the top surface of the buried-hill.Additionally,anisotropic pre-stack depth migration technology enhances the imaging quality of the buried-hill's interior,while lowpass filtering clarifies internal fault breakpoints.Over 50 new faults have been identified on the top surface of the slope belt buried-hill,and more than 30 favorable traps within the Ordovician system have been identified and confirmed,resulting in an increased trap area of nearly 20 km^(2).Several wells,such as Well JG21x,have achieved high-yield oil flows within the buried-hill.The novel reservoir formation model challenges previous notions that the buried-hills on the western slope of the depression were non-exploratory targets.The newly proposed model suggests these reservoirs are shallow-buried with high productivity,becoming a promising area for exploration in North China.High-quality seismic data have been obtained through combined seismic data processing and interpretation.Guided by the new geological model,a fresh understanding of buried-hill reservoir formation has been developed.[Conclusion]This integrated approach provides valuable reference insights for exploration in highly mature areas with complex buried-hills.
作者
张宏伟
庞雄奇
王鹏
陈杰
杨丽丽
万照飞
ZHANG Hongwei;PANG Xiongqi;WANG Peng;CHEN Jie;YANG Lili;WAN Zhaofei(College of Geosiences,China University of Petroleum(Beijing),Beijing 102249,China;Geological Research Center,GRI,BGP Inc.,CNPC,Zhuozhou Hebei 072751,China;Geophysical Research Institute,Tarim Geological Division,CNPC,Korla Xinjiang 841000,China)
出处
《地质科技通报》
北大核心
2025年第3期29-42,共14页
Bulletin of Geological Science and Technology
基金
中国石油天然气股份有限公司科技重大专项“华北油田持续稳产勘探开发关键技术研究与应用”(2017E-15)。
关键词
冀中坳陷
束鹿凹陷
西部斜坡带
潜山圈闭
成藏模式
碳酸盐岩
Jizhong Depression
Shulu Sag
western slope belt
buried-hill trap
accumulation model
carbonate
