南海北部白云凹陷继承性陆缘背景古潜山成因及类型  

Genesis and Types of Buried Hills in the Tectonic Setting of the Inheriting Continental Margin in Baiyun Sag,Northern South China Sea

作　　者：刘军 彭光荣 张丽丽 李洪博 汪旭东 吴哲 官伟 梁超 黄雷 Liu Jun;Peng Guangrong;Zhang Lili;Li Hongbo;Wang Xudong;Wu Zhe;Guan Wei;Liang Chao;Huang Lei(Shenzhen Branch of CNOOC Ltd.,Shenzhen 518054,China;China National Offshore Oil Corporation Deepwater Development Ltd.,Shenzhen 518000,China;Institute of Oil and Gas Basin,Northwest University,Xi`an 710069,China)

机构地区：[1]中海石油(中国)有限公司深圳分公司,广东深圳518054 [2]中海石油深海开发有限公司,广东深圳518000 [3]西北大学含油气盆地研究所,陕西西安710069

出　　处：《地球科学》2025年第2期405-418,共14页Earth Science

基　　金：中国海洋石油有限公司前瞻基础研究项目《南海东部地区前新生界石油地质条件及勘探潜力》(No.KJQZ-2024-2004);中海石油(中国)有限公司重大项目“南海大中型天然气田形成条件、勘探潜力与突破方向”(No.KJZH-2021-0003);中海石油(中国)有限公司“十四五”科技攻关项目“中国近海新区新领域勘探技术”(No.KJGG2022-0302);国家自然科学基金项目(No.42272148).

摘　　要：白云凹陷潜山是南海北部珠江口盆地油气勘探向深水深层进军的现实领域之一,目前对潜山成因及分类的研究相对薄弱,制约潜山带油气勘探潜力的评价.利用大面积三维地震资料,考虑继承性陆缘背景的构造相互作用关系,开展白云凹陷潜山构造解析.识别出了基底内幕的中生代先存构造,新生代拆离断裂体系和多期次岩浆活动,以及走滑断裂体系.明确白云凹陷潜山的形成是中生代挤压构造,新生代伸展拆离和岩浆底侵耦合及晚期断裂改造的结果.基于上述主控因素提出白云凹陷潜山分类方案,该地区潜山划分为中生代构造主控的地貌残丘型,新生代早期构造主控的伸展块断型以及后期改造型共3大类6小类.其中白云主洼北部的冲断残丘型和白云主洼东部的翘倾断块型以及白云西南部断垒型和走滑块断型潜山具有良好的花岗岩潜山储层发育条件,是寻找潜山圈闭的有利区.The buried hill in the Baiyun Sag is one of the deep-water oils and gas exploration fields in the Pearl River Mouth Basin in the northern South China Sea.However,research on the origin and classification of buried hills is relatively weak,which restricts the evaluation of the oil and gas exploration potential of buried hills.Structural analysis of buried hills in the Baiyun Sag from the perspective of inherited continental margin tectonic background using large-scale 3D seismic data.Mesozoic preexisting structures,Cenozoic detachment fault systems and multiple phases of magmatism,and strike-slip fault systems are identified.The buried hill in the Baiyun Sag is affected by three main controlling factors:pre-existing basement structure,detachment fault and late magmatic transformation.The buried hills in this area can be divided into three types and six subtypes:the geomorphic residual hill dominated by the Mesozoic structure,the extensional fault block dominated by the early Cenozoic structure,and the later modified buried hills.Among them,the thrust residual hill in the northern Baiyun sag,the tilting fault block in the eastern Baiyun sag and the horst and fault blockformed by normal and strike-slip faults of different orientations in the southwestern Baiyun sag have good granite reservoir development conditions,and is the favorable area to search for traps.

关 键 词：南海北部 白云凹陷 潜山 先存构造 拆离断裂 岩浆作用 成因类型 石油地质 

分 类 号：P618.13[天文地球—矿床学]