现代地质2024，Vol.38Issue(2)：350-361,12.DOI:10.19657/j.geoscience.1000-8527.2023.075
川东北元坝西部须二段—须三段沉积相及其对储层控制作用
Sedimentary Facies and Its Controls on the Reservoir of Xu-2-Xu-3 Member in the Western Yuanba,Northeast Sichuan Basin
摘要
Abstract
The Upper Triassic Xu-2-Xu-3 Member in the western Yuanba of Northeast Sichuan is an important oil and gas reservoir.In this study,we used drilling cores,logging data,and 3D seismic data to study the sedi-mentary facies,sedimentary characteristics,depositional models,and their effects on the reservoir development of the Upper Triassic Xu-2-Xu-3 Members,as to guide the deployment of oil and gas exploration in the region.The results show that Xu-2-Xu-3 Members are mainly braided river delta facies and lacustrine facies.Four subfacies have been recognized,as delta plain,delta,front delta,and coastal shallow lake,which can be fur-ther divided into 9 microphases.Two depositional models were developed during the depositional period of Xu-2-Xu-3 Member.Xu-2 Member shows a model of gentle slope wide channel braided river delta deposition,and mainly develops wide river channels with overlapping sand bodies.Xu-3 Member shows a model of steep slope narrow channel braided river delta deposition,and mainly develops narrow river channels,and the sand bodies are distributed as strips along the river channel.Xu-2 Member mainly develops two favorable reservoir rock types,medium feldspar sandstone and medium-grained quartz sandstone.Xu-3 Member also develops two favor-able reservoir rock types,medium-coarse calcareous sandstone and fine sandy conglomerate.The high-quality reservoirs of Xu-2 Member are mainly distributed in the sand bodies of the underwater distributary channel of the delta front.The high-quality reservoirs of Xu-3 Member are mainly distributed in the sand bodies of the braided channel-delta front of the underwater distributary channel transition zone in the delta plain.The physical proper-ties and pore structure of feldspar sandstone and quartz sandstone are significantly better developed than those of the calcareous sandstone and sandy conglomerate.关键词
辫状河三角洲/沉积模式/优质储层/须家河组/川东北地区Key words
braided river delta/sedimentary model/high-quality reservoir/Xujiahe Formation/Northeastern Sichuan Basin分类
地质学引用本文复制引用
王爱,肖开华,刘忠群,黄彦庆,乔大伟..川东北元坝西部须二段—须三段沉积相及其对储层控制作用[J].现代地质,2024,38(2):350-361,12.基金项目
中国石油化工股份有限公司科技部项目(P19012-2,P23130). （P19012-2,P23130）
