珠江口盆地惠州凹陷裂后期沉降特征及成因分析  

Post-rift subsidence history and mechanism of Huizhou depression in the Pearl River Mouth Basin

作　　者：王聪[1,2] 梅廉夫[2] 陈汉林[1] 施和生 舒誉 刘海伦[2] 王辉[4] 

机构地区：[1]浙江大学地球科学学院,浙江杭州310027 [2]中国地质大学构造与油气资源教育部重点实验室,湖北武汉430074 [3]中海石油(中国)有限公司深圳分公司,广东广州510240 [4]中国石油集团测井有限公司长庆事业部,陕西西安710201

出　　处：《中南大学学报（自然科学版）》2016年第3期807-818,共12页Journal of Central South University:Science and Technology

基　　金：国家科技重大专项(2011ZX05023-001-015)~~

摘　　要：为了认识惠州凹陷裂后期的整体沉降规律,运用回剥法对惠州凹陷的25口钻井和24口虚拟井进行沉降分析,计算不同沉积时期的沉降速率,分析裂后期沉降中心分布及迁移规律。研究结果表明:惠州凹陷裂后期沉降具有幕式特征,根据沉降曲线将其划分为3幕:裂后热稳定沉降幕(珠海组—珠江组下段)、加速沉降I幕(珠江组上段—韩江组)、加速沉降II幕(粤海组—第四系)。裂后期沉降中心呈现出明显的自NE向SE方向顺时针迁移规律。结合裂后期区域应力场、物源区以及沉积通量的分析,认为惠州凹陷周缘板块的运动学特征以及板块重组事件,对裂后期幕式沉降过程起到一定的控制作用,而珠江流域沉积通量的增加也可能是裂后期加速沉降的诱因之一。In order to master the whole post-rift subsidence law of Huizhou depression, 25 drilling boreholes and 24 virtual boreholes were analyzed via back-stripping method, and subsidence rates of different sedimentary periods were calculated and spatial-temporal variations of the subsidence were discussed. The result indicates that the Huizhou depression undergoes the episodic subsidence in the post-rift stage. The subsidence process can be divided into three substages by subsidence curve. The post-rift stable thermal subsidence episodic is the sedimentary period of Zhuhai Formation and lower Zhujiang Formation. The accelerated subsidence episodic I is the sedimentary period of upper Zhujiang Formation and Hanjiang Formation. The accelerated subsidence episodic II is the sedimentary period of Yuehai Formation, Wanshan formation and Quaternary. Post-rift subsidence centers present obvious clockwise migration from northeast to southeast. Based on the regional stress field, provenance and sediment flux, it can be inferred that the movement and regeneration of the surrounding plates may play an important role in the episodic subsidence process. Meanwhile, the increase of the sediment flux of Pearl River may be one of the reasons for post-rift accelerated subsidence.

关 键 词：加速沉降 裂后期 惠州凹陷 珠江口盆地 

分 类 号：P542[天文地球—构造地质学] P736[天文地球—地质学]