西湖凹陷龙井运动构造递进变形特征与机制  

Progressive deformation characteristics and mechanism of Longjing movement in Xihu Sag

作　　者：何新建 蒋一鸣 李磊 钟荣全 冯桢鸣 张武 HE Xinjian;JIANG Yiming;LI Lei;ZHONG Rongquan;FENG Zhenming;ZHANG Wu(CNOOC China Limited,Shanghai Branch,Shanghai 200335,China)

机构地区：[1]中海石油(中国)有限公司上海分公司,上海200335

出　　处：《中国海上油气》2024年第5期34-43,共10页China Offshore Oil and Gas

基　　金：中国海洋石油有限公司综合科研项目“西湖凹陷构造运动对大型圈闭发育和大规模油气运聚的控制(编号:KJZH-2023-2103)”;中国海洋石油集团有限公司前瞻基础项目“海洋油气勘探国家工程研究中心主任基金(2024)(编号:KJQZ-2024-2104)”部分研究成果。

摘　　要：龙井运动是东海陆架盆地西湖凹陷新近纪以来的关键构造运动,但对龙井运动幕次及起止时间认识不清。依托三维地震资料,运用生长地层法、平衡剖面等技术,细致刻画了龙井运动的幕次和各幕次的起止时间,总结了构造递进变形特征,结合物理模拟实验,探讨变形机制。研究表明:①龙井运动可划分为早、中和晚3个幕次,其中龙井运动早幕是构造运动主幕,持续时间长(T_(15)—T_(11)),龙井运动中幕和晚幕持续时间短(T_(10)、T_(5));②西湖凹陷龙井运动东西方向上存在构造递进变形特征,东部早反转晚结束,持续时间长,变形强度大;西部晚反转早结束,持续时间短,变形强度弱;③西湖凹陷构造递进变形特征受控于东侧挤压作用向西传递过程中的衰减作用。本次研究成果对于西湖凹陷油气成藏期厘定、埋藏史恢复等均具有重要参考价值。Longjing movement is a pivotal tectonic movement in Xihu Sag of the East China Sea shelf basin since Neogene,but the stage and start and end time of Longjing movement are not clearly understood.Based on 3D seismic data,the stages of Longjing movement and the start and end time of each stage were described by using techniques of growth stratigraphy and balanced section,and the progressive deformation characteristics were summarized.The deformation mechanism was discussed by combining physical simulation experiments.The results show that:①Longjing movement can be divided into three stages:early stage,middle stage,and late stage.The early stage of Longjing movement is the main stage of tectonic movement with a long duration(T15-T11),while the middle stage and late stage of Longjing movement have a short duration(T10and T5).②There are progressive deformation characteristics in the east-west direction of Longjing movement in Xihu Sag,and the inversion starts early and ends late in the east,with a long duration and high deformation intensity.In the west,the inversion starts late and ends early,with short duration and weak deformation intensity.③The progressive deformation characteristics of the Xihu Sag are controlled by the attenuation of the east-side diaxial compression during its transfer to the west.The results of this study have important reference value for determining the hydrocarbon accumulation period and recovering burial history in Xihu Sag.

关 键 词：龙井运动 生长地层法 构造递进变形 西湖凹陷 东海陆架盆地 

分 类 号：TE121[石油与天然气工程—油气勘探] P744.4[天文地球—海洋科学]