南海北部陆缘盆地反转构造研究:以莺歌海盆地临高隆起和珠江口盆地琼海凹陷为例  

Inversion structures in the northern continental margin of the South China Sea:Taking Lingao Uplift in the Yinggehai Basin and Qionghai Sag in the Pearl River Mouth Basin as examples

作　　者：徐子英[1,2] 孙珍[1] 张云帆[1,2] 周蒂[1] 姜建群[3] 樊浩[3] 

机构地区：[1]中国科学院边缘海地质重点实验室,南海海洋研究所,广东广州510301 [2]中国科学院研究生院,北京100049 [3]中国石油天然气股份有限公司辽河油田海南油气勘探分公司,辽宁盘锦124010

出　　处：《地学前缘》2010年第4期90-98,共9页Earth Science Frontiers

基　　金：国家重点基础研究发展计划"973"项目(2007CB41170405;2009CB219401);中国科学院南海海洋研究所知识创新工程领域前沿项目(LYQY200704);中国科学院海洋地质与环境重点实验室开放课题资助项目;中石油辽河油田公司重大科技项目"南海西北部陆坡区区域地质及其成因动力学模拟研究"和"华光凹陷构造演化及其对油气成藏的研究"

摘　　要：为揭示南海北部陆缘盆地反转构造的几何形态、演化及形成时期,文中利用反转构造定量分析方法,以莺歌海盆地临高隆起和珠江口盆地琼海凹陷反转构造为例,对两盆地中的反转构造生长指数、位移-距离曲线和反转率进行了定量分析。结果表明:莺歌海盆地临高隆起构造反转始于早渐新世,主要反转期为晚渐新世—早中新世,反转程度中等,为上盖下正的断层型反转构造;珠江口盆地琼海凹陷构造反转主要发生在晚中新世,反转程度轻微,为上凸下凹的褶皱型反转构造.两反转构造均具有良好的生、储、盖条件和时空配置关系,为有利的油气聚集区。To reveal the geometry,evolution and timing of inversion structures on the northern continental margin of the South China Sea,we analyzed the inversion structures in Lingao Uplift of the Yinggehai Basin and Qionghai Sag of the Pearl River Mouth Basin through quantitative analytical methods. Growth index,displacement-distance curve and reversal rate of inversion structures are calculated in above two basins. The results suggested that the tectonic inversion in Lingao Uplift began in the Early-Oligocene,mainly developed from the Late-Oligocene to the Early Miocene,the inversion degree is moderate,and it belongs to fault inversion structures with cap upper part and normal lower part. Tectonic inversion in Qionghai Sag developed in the Late-Miocene,the inversion is mild,and it belongs to folded inversion structures with convex upper part and concave lower part. The inversion structures in the two basins have good hydrocarbon potential in generation,storage,cover and the good relationship between time and space allocation,they are favorable traps for the oil and gas accumulation.

关 键 词：莺歌海盆地 珠江口盆地 反转构造 定量分析 反转程度 

分 类 号：P618.13[天文地球—矿床学] P544.4[天文地球—地质学]