Application of 9-component S-wave 3D seismic data to study sedimentary facies and reservoirs in a biogasbearing area:A case study on the Pleistocene Qigequan Formation in Taidong area,Sanhu Depression,Qaidam Basin,NW China  

作　　者：XU Zhaohui LI Jiangtao LI Jian CHEN Yan YANG Shaoyong WANG Yongsheng SHAO Zeyu 

机构地区：[1]PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China [2]PetroChina Qinghai Oilfield Company,Dunhuang 736202,China [3]Qinghai Provincial Key Laboratory of Plateau Saline-Lacustrine Basinal Oil&Gas Geology,Dunhuang 736202,China

出　　处：《Petroleum Exploration and Development》2024年第3期647-660,共14页石油勘探与开发（英文版）

基　　金：Supported by the CNPC Science and Technology Projects(2022-N/G-47808,2023-N/G-67014);RIPED International Cooperation Project(19HTY5000008).

摘　　要：To solve the problems in restoring sedimentary facies and predicting reservoirs in loose gas-bearing sediment,based on seismic sedimentologic analysis of the first 9-component S-wave 3D seismic dataset of China,a fourth-order isochronous stratigraphic framework was set up and then sedimentary facies and reservoirs in the Pleistocene Qigequan Formation in Taidong area of Qaidam Basin were studied by seismic geomorphology and seismic lithology.The study method and thought are as following.Firstly,techniques of phase rotation,frequency decomposition and fusion,and stratal slicing were applied to the 9-component S-wave seismic data to restore sedimentary facies of major marker beds based on sedimentary models reflected by satellite images.Then,techniques of seismic attribute extraction,principal component analysis,and random fitting were applied to calculate the reservoir thickness and physical parameters of a key sandbody,and the results are satisfactory and confirmed by blind testing wells.Study results reveal that the dominant sedimentary facies in the Qigequan Formation within the study area are delta front and shallow lake.The RGB fused slices indicate that there are two cycles with three sets of underwater distributary channel systems in one period.Among them,sandstones in the distributary channels of middle-low Qigequan Formation are thick and broad with superior physical properties,which are favorable reservoirs.The reservoir permeability is also affected by diagenesis.Distributary channel sandstone reservoirs extend further to the west of Sebei-1 gas field,which provides a basis to expand exploration to the western peripheral area.

关 键 词：9-component S-wave 3D seismic data seismic sedimentology biogas sedimentary facies reservoir Qaidam Basin Sanhu Depression Pleistocene Qigequan Formation 

分 类 号：P618.13[天文地球—矿床学] P631.4[天文地球—地质学]