地质学报2026，Vol.100Issue(8)：2900-2915,16.DOI:10.19762/j.cnki.dizhixuebao.2025114
西湖凹陷中南部低幅度-弱反转背斜构造成因、演化及其成藏潜力
Low-amplitude-weak inversion anticline structures in the southern part of Xihu sag:Genesis,evolution,and hydrocarbon potential
摘要
Abstract
The central anticline belt in the Xihu sag is a key area for hydrocarbon accumulation.However,previous studies have paid limited attention to low-amplitude-weak inversion anticline structures in this region.These structures differ significantly from the widely developed high-amplitude-strong inversion anticlines in terms of their genesis and evolution.Based on the latest 3D seismic data,this study conducts a detailed structural analysis of the H and Q anticlines in the low-amplitude-weak inversion anticline zone.It reveals their genesis,evolution,and impact on hydrocarbon accumulation.The research shows that low-amplitude-weak inversion anticline structures formed as cover anticlines during the rift phase under a paleo-uplift background and were finalized by compression-inversion during the Longjing Movement.These structures have an"early extension-late weak compression"composite genesis.During the extension phase,the early cover anticline morphology and flower-like fault systems formed simultaneously.Moreover,the intensity of tertiary fault activity in the wings of the anticline has always been greater than in the core of the anticline throughout the structural evolution process.Based on the new understanding of the evolution of low-amplitude-weak inversion anticline structures,this study identifies favorable conditions for hydrocarbon accumulation:"paleo-uplift background and cover anticline-controlled hydrocarbon migration and accumulation","structure-lithologic traps controlled by extension-compression interaction",and"key hydrocarbon accumulation periods with source-fault-sand configurations in the wings of the anticline".These factors highlight the exploration potential for structure-lithologic gas reservoirs in the wings of the anticline.This research deepens the understanding of hydrocarbon enrichment patterns in inversion structures in the central anticline belt and has played a key role in breaking through natural gas exploration in the southern part of Xihu sag.关键词
低幅度-弱反转背斜/伸展-挤压复合成因/似花状断裂组合/构造-岩性圈闭/西湖凹陷中南部Key words
low-amplitude-weak inversion anticline/extension-compression composite genesis/flower-like fault systems/structure-lithologic traps/southern part of Xihu sag引用本文复制引用
蒋一鸣,唐贤君,何新建,朱虹浩,张武,钟荣全..西湖凹陷中南部低幅度-弱反转背斜构造成因、演化及其成藏潜力[J].地质学报,2026,100(8):2900-2915,16.基金项目
本文为国家自然科学基金项目(编号42430806)、中国海洋石油有限公司重大科技专项(编号KJZX-2023-0101)和中国海洋石油有限公司综合科研项目(编号KJZH-2023-2103)联合资助的成果. （编号42430806）
