Distribution characteristics of delta reservoirs reshaped by bottom currents:A case study from the second member of the Yinggehai Formation in the DF1-1 gas field,Yinggehai Basin,South China Sea

作     者：Shuo Chen Renhai Pu Huiqiong Li Hongjun Qu Tianyu Ji Siyu Su Yunwen Guan Hui Zhang Shuo Chen;Renhai Pu;Huiqiong Li;Hongjun Qu;Tianyu Ji;Siyu Su;Yunwen Guan;Hui Zhang

作者机构：State Key Laboratory of Continental Dynamics(Northwest University)Xi’an710069China Research Institute of Yanchang Petroleum Group Co.Ltd.Xi’an710065China Research Institute of Petroleum Exploration and DevelopmentBeijing100083China Research Institute of Zhanjiang Branch of China National Offshore Oil CorporationZhanjiang524057China 

出 版 物：《Acta Oceanologica Sinica》 (海洋学报（英文版）)

年 卷 期：2022年第41卷第9期

页      面：86-106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] 0824[工学-船舶与海洋工程] 

基　　金：The National Natural Science Foundation of China’s Major Project“Research on Geophysical Theories and Methods of Unconventional Oil and Gas Exploration and Development” Task I:“China’s Tight Oil and Gas Reservoir Geological Characteristics Classification and Typical Geological Model Establishment”under contract No.41390451 

主　　题：South China Sea Yinggehai Basin second member of the Yinggehai Formation bottom current transformation sedimentary model 

摘      要：The Dongfang1-1 gas field(DF1-1)in the Yinggehai Basin is currently the largest offshore self-developed gas field in China and is rich in oil and gas *** second member of the Pliocene Yinggehai Formation(YGHF)is the main gas-producing formation and is composed of various sedimentary types;however,a clear understanding of the sedimentary types and development patterns is ***,typical lithofacies,logging facies and seismic facies types and characteristics of the YGHF are identified based on high-precision 3D seismic data combined with drilling,logging,analysis and testing *** on 3D seismic interpretation and attribute analysis,the origin of high-amplitude reflections is clarified,and the main types and evolution characteristics of sedimentary facies are *** gas formation upper II(IIU)as an example,the plane distribution of the delta front and bottom current channel is determined;finally,a comprehensive sedimentary model of the YGHF second member is *** second member is a shallowly buried“bright spotgas reservoir with weak *** velocity of sandstone is slightly lower than that of mudstone,and the reflection has medium amplitude when there is no *** velocity of sandstone decreases considerably after gas accumulation,resulting in an increase in the wave impedance difference and high-amplitude(bright spot)reflection between sandstone and mudstone;the range of high amplitudes is consistent with that of gas-bearing *** distribution of gas reservoirs is obviously controlled by dome-shaped diapir structural traps,and diapir faults are channels through which natural gas from underlying Miocene source rocks can enter *** study area is a delta front deposit developed on a shallow sea *** lithologies of the reservoir are mainly composed of very fine sand and coarse silt,and a variety of sedimentary structural types reflect a shallow sea delta environment;upward thickening funnel type,strong tooth