Source-sink System and Sedimentary Model of Progradational Fan Delta Controlled by Restricted Ancient Gully:An Example in the Enping Formation in the Southern Baiyun Sag,Pearl River Mouth Basin,Northern South China Sea

作     者：FENG Congjun YAO Xingzong YANG Haizhang LI Daming SUN Mengsi FENG Congjun;YAO Xingzong;YANG Haizhang;LI Daming;SUN Mengsi

作者机构：State Key Laboratory of Continental DynamicsNorthwest UniversityXi'an 710069China Department of GeologyNorthwest UniversityXi'an 710069China CNOOC Research Institute Co.Ltd.Beijing 100028China School of Petroleum Engineering and Environmental EngineeringYan'an UniversityYan'anShaanxi 716000China 

出 版 物：《Acta Geologica Sinica(English Edition)》 (地质学报（英文版）)

年 卷 期：2021年第95卷第1期

页      面：232-247页

核心收录：

学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：supported by the National Science and Technology Major Project(Grant no.2016ZX05026–007–007) the National Natural Science Foundation of China(Grant no.41502127) the Natural Science Basic Research Plan in Shaanxi Province of China(Grant nos.2017JM4013 2020JQ798) the Scientific Team Foundation of Department of Geology,Northwest University,Xian 

主　　题：synsedimentary fault structural style fan delta ancient gully source-sink system 

摘      要：Tectonic activity occurred during the depositional period of the Enping Formation in the southern Baiyun Sag in the Pearl River Mouth Basin,with a series of synsedimentary faults and a set of large fan delta reservoir bodies *** is no data from drilling,cores,*** this area,so this paper applies three-dimensional seismic data to study the structural style of the steep slope zone,the seismic facies characteristics of fan deltas,and the source-sink system and sedimentary model of the Enping *** control action of tectonic activity on fan deltaic sedimentary systems is studied by combining interpretation of fault systems,dissection of structural styles,seismic reflection structure,seismic facies geometry,and seismic attribute analysis,together with theoretical analysis of the source-sink deposition *** Baiyun Sag has experienced tectonic activity since the Eocene,and a series of synsedimentary faults are developed in the southern steep slope *** the common control of multiple large synsedimentary faults,a large ancient gully formed in the steep slope zone in the south,which gradually widened from south to *** uplift area in the southern part of the sag was exposed for a long time during the deposition of the Enping Formation and consequently suffered weathering and *** resulting sediments were transported through a system of provenance channels composed of slopes and an ancient gully to the depression area,where they were deposited and eventually converged to form a large fan *** fan delta presents the overall characteristics of NS strong wedge reflection and EW strong domal reflection—thick in the middle part and thin in the *** displays a lobe-shaped distribution on the plane,with the fan root pointing to the south *** to differences in reflection intensity from bottom to top,it can be subdivided into three stages of progradational sedimentary bodies—the southern uplift and denudation zone,t