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中国东-南部裂陷盆地断裂系统复杂性的表现形式及成因机制——以南堡凹陷和涠西南凹陷为例
投稿时间:2017-12-12  修订日期:2018-03-23  点此下载全文
引用本文:童亨茂,范彩伟,孟令箭,赵宝银,范晋煜.2018.中国东-南部裂陷盆地断裂系统复杂性的表现形式及成因机制——以南堡凹陷和涠西南凹陷为例[J].地质学报,92(9):1753-1765
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作者单位E-mail
童亨茂 1) 中国石油大学(北京)油气资源与探测国家重点实验室北京102249 tonghm@cup.edu.cn 
范彩伟 2) 中海油湛江分公司研究院广东湛江524000  
孟令箭 3) 中国石油冀东油田分公司勘探开发研究院河北唐山063004  
赵宝银 3) 中国石油冀东油田分公司勘探开发研究院河北唐山063004  
范晋煜 1) 中国石油大学(北京)油气资源与探测国家重点实验室北京102249  
基金项目:国家油气重大专项(2016ZX05024-005-004)和国家自然科学基金项目(编号41272160)资助
中文摘要:中国东-南部裂陷系列盆地油气资源十分丰富,而断层的分布演化十分复杂,是油气进一步勘探开发需要解决的关键问题。本文应用广义断层模式,在大量三维地震资料构造解析的基础上,以渤海湾盆地的南堡凹陷和北部湾盆地的涠西南凹陷为例,对中国东-南部盆地复杂的断裂系统进行了解剖和归纳,并提出了伸展变形区预测断层性质的伸展应变椭圆。结果表明,中国东-南部裂陷盆地断裂系统的复杂性存在9种表现方式,从成因上进一步归纳为3个方面:①断层的走向和性质多样;②断层在平、剖面上存在复杂多变的组合形式;③断层形成和演化存在复杂的时-空关系。造成复杂性的根本原因是先存断裂分布的复杂性和不同方向(北西-南东向和近南北向)伸展变形的叠加。不同盆地、同一盆地不同区域应力场演化具有很大的相似性:40Ma以前,北西-南东向伸展;38Ma以来,近南北向伸展。断层分布和演化差异主要是由先存构造分布差异造成的。
中文关键词:裂陷盆地  断层  复杂性  伸展  成因机制  广义断层模式
 
Manifestation and Origin Mechanism of the Fault System Complexity in Rift Basins in Eastern-Southern China:Case Study of the Nanbu and Weixinan Sags
NameInstitution
TONG Hengmao1) State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing, 102249;
FAN Caiwei2) Zhanjiang Branch of CNOOC, Zhanjiang, Guangdong, 524057
MENG Lingjian3) Exploration and Development Research Institute, PetroChina Jidong Oilfield Company,Tangshan, Hebei, 063004
ZHAO Baoyin3) Exploration and Development Research Institute, PetroChina Jidong Oilfield Company,Tangshan, Hebei, 063004
FAN Jinyu1) State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing, 102249;
Abstract:Rift basins in eastern and southern China host abundant oil and gas resources. But the complicated evolution and distribution of the faults are the key issues to be solved in future oil and gas exploration and development. Based on the structure interpretation of a large number of 3D seismic data and the generalized faulting model, this study selected the Nanpu Sag in the Bohai Bay Basin and the Weixinan Sag in the Beibuwan Basin as study examples so as to analyze and summarize the complicated fault system of basins in eastern and southern China. An extension strain ellipse was proposed to predict fault nature in extensional deformation zone. The results show that there are nine ways by which fault system complexity of rift basins in the east-south China are presented. They can be further summarized into three aspects, (1) variety of the fault strike and nature, (2) variable assemblages in the plane and profile, (3) complicated spatiotemporal relation of fault distribution and evolution. The fundamental reasons for complexity of the fault system are the distribution complexity of the pre existing faults and the superposition of extensional deformation in different directions (NW SE and near N S). The evolution of tectonic stress field in different basins and even in different parts of a basin shows great similarities, NW SE extension before 40Ma and north south extension since 38Ma. Therefore, the distribution and evolution of faults are mainly affected by the differences in the distribution of pre existing faults.
keywords:rift basin  fault  complexity  extension  origin mechanism  generalized fault model
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