基于重力资料的南海及邻区断裂分布特征研究  

Study on distribution features of faults based on gravity data in the South China Sea and its adjacent areas

作　　者：罗新刚 王万银[1] 张功成 赵志刚 刘金兰[1] 谢晓军 邱之云[1] 冯旭亮[1,3] 纪晓琳 王丁丁[1] LUO XinGang;WANG WanYin;ZHANG GongCheng;ZHAO ZhiGang;LIU JinLan;XIE XiaoJun;QIU ZhiYun;FENG XuLiang;JI XiaoLin;WANG DingDing(Institute of Gravity and Magnetic Technology,College of Geology Engineering and Geomatics,Key Laboratory of Western China′s Mineral Resources and Geological Engineering,Ministry of Education,Chang′an University,Xi′an 710054,China;CNOOC Research Institute,Beijing 100027,China;School of Earth Sciences and Engineering,Xi′an Shiyou University,Xi′an 710065,China)

机构地区：[1]长安大学重磁方法技术研究所,长安大学地质工程与测绘学院,长安大学西部矿产资源与地质工程教育部重点实验室,西安710054 [2]中海油研究总院,北京100027 [3]西安石油大学地球科学与工程学院,西安710065

出　　处：《地球物理学报》2018年第10期4255-4268,共14页Chinese Journal of Geophysics

基　　金：国家科技重大专项“海洋深水区油气勘探关键技术”(2008ZX05025);中海油研究总院科技项目“重磁震联合研究南海新生代盆地分布与构造区划”;中央高校基本科研业务费专项资金(310826163301)联合资助.

摘　　要：断裂构造作为重力异常一个非常重要的解释成果,它与能源和矿产资源勘查、构造单元划分和大地构造分区有着密切的联系.有些地质界线以断裂为界,有些能源或矿产资源与断裂伴生.本文利用重力异常,采用归一化总水平导数垂向导数(NVDR-THDR)断裂识别方法推断了南海及邻区主要断裂平面分布位置,首次采用重力异常曲率属性方法反演了南海及邻区主要断裂视深度.在南海及邻区推断断裂57条,其中一级断裂14条,二级断裂43条;断裂走向以NE和NW向为主,其次为NEE、NWW和NNE向以及NNW、EW和近SN向;一级断裂长度大部分为600~1400km,二级断裂长度大部分为400~900km;断裂视深度约为2~10km,其中一级断裂视深度大部分为2~10km,二级断裂视深度大部分为2~8km.该研究成果可以为南海及邻区油气勘探、矿产资源勘探以及基础地质研究提供依据.Fault structure is a very important interpretation result of gravity anomalies.It is closely related to energy and mineral resources exploration,structural unit division and geotectonic division.Some geological boundaries are bounded by faults,and some energy or mineral resources are associated with faults.In this work we estimated the distribution of the major faults by using the normalized vertical derivative of total horizontal derivative(NVDR-THDR)of the gravity anomalies and inverted the apparent depth of faults by using the gravity anomaly curvature attribute method for the first time in the South China Sea and its adjacent areas.In the study area,57 faults were inferred,including 14 first-order and 43 second-order ones;strikes of which are dominated by NE and NW directions,followed by NEE,NWW,NNE,and NNW,EW,and nearly NS directions.The length of the most first-order faults is 600~1400 km and the most second-order faults′is 400~900 km.The apparent depth of faults is about 2~10 km,which of first-order faults is 2~10 km and second-order faults 2~8 km.The research results can provide evidence for exploration of oil and gas and mineral resources and basic geological research in the South China Sea and its adjacent areas.

关 键 词：南海及邻区 重力异常 断裂平面分布 断裂视深度 

分 类 号：P631[天文地球—地质矿产勘探] P227[天文地球—地质学]