摘要
渤中凹陷西洼新近系是渤海海域油气勘探的重点层系,近年来逐渐成为油气规模增储的主战场之一。为明确渤中西洼洼陷区新近系油气控藏规律,基于渤中西洼油气勘探成果,在成藏特点整体解剖的基础上,重点分析深层构造脊、断层和盖层三要素对新近系油气平面运聚和空间分布的控制作用,首次提出了“脊-断-盖”联控成藏模式。研究表明,构造脊控制油气汇聚部位,断层的发育程度控制新近系油气充注层位,泥岩盖层的厚度制约馆陶组油气富集。深层构造脊、断裂、泥岩盖层的有效配置共同决定了洼陷区具备形成大规模油气藏的条件。在此成藏规律指导下,滚动钻探的渤中8B构造均取得了商业成功,进一步证实了“脊-断-盖”控藏模式在洼陷区勘探中的可行性,对深化洼陷区油气成藏认识和下一步寻找有利勘探目标都具有重要意义。
The Neogene in the Western Sag of Bozhong Sag is a key target horizon for oil and gas exploration in the Bohai Sea area,and has gradually become one of the core areas for large-scale oil and gas reserve growth in recent years.To clarify the hydrocarbon accumulation-controlling laws of the Neogene in the Western Subsag of Bozhong Sag,based on oil and gas exploration achievements in the Western Subsag of Bozhong Sag and on the basis of a comprehensive analysis of accumulation characteristics,this study focuses on analyzing the controlling effects of three key factors(deep-seated structural ridges,faults,and caprocks)on the horizontal migration-accumulation and spatial distribution of hydrocarbons in the Neogene,and for the first time proposes the“RidgeFault-Caprock”joint-controlled hydrocarbon accumulation model.The study shows that structural ridges control the locations of hydrocarbon convergence,the development degree of faults controls the hydrocarbon charging horizons in the Neogene,and the thickness of mudstone caprocks restricts hydrocarbon enrichment in the Guantao Formation.The effective configuration of deep-seated structural ridges,faults,and mudstone caprocks jointly determines that the subsag area has the conditions for forming large-scale hydrocarbon reservoirs.Under the guidance of these hydrocarbon accumulation laws,the rolling drilling in the Bozhong 8 B Structure has achieved commercial success,further verifying the feasibility of the“Ridge-Fault-Caprock”accumulation-controlling model in subsag area exploration.This is of great significance for deepening the understanding of hydrocarbon accumulation in subsag areas and for identifying favorable exploration targets in the next step.
作者
李龙
张兴强
安俊睿
陈怀毅
姜崇
LI Long;ZHANG Xingqiang;AN Junrui;CHEN Huaiyi;JIANG Chong(Bohai Oilfield Research Institute,Tianjin Branch of CNOOC China Limited,Tianjin 300459,China)
出处
《现代地质》
北大核心
2025年第6期1622-1632,共11页
Geoscience
基金
中国海洋石油有限公司“十四五”重大科技项目“地层岩性油气藏高效识别与精细评价技术”(KJGG2022-0303)
中海石油(中国)有限公司“七年行动计划”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”(CNOOC-KJ135ZDXM36TJ08TJ)。
关键词
渤中西洼
新近系
构造脊
断裂
泥岩盖层
成藏模式
Western Subsag of Bozhong Sag
Neogene
structural ridge
fault
mudstone caprock
hydrocarbon accumulation model
