川东满月乡双河口剖面上二叠统地层充填序列及储层发育特征  

Upper Permian Stratigraphic Filling Sequence and Reservoir Development Characteristics of Shuanghekou Section of Man Yuexiang,Eastern Sichuan

作　　者：刘正元 Liu Zhengyuan(College of Energy Resources,Chengdu University of Technology,Chengdu 610059,China)

机构地区：[1]成都理工大学能源学院,四川成都610059

出　　处：《山东化工》2020年第5期243-246,共4页Shandong Chemical Industry

摘　　要：四川盆地作为我国大型的海陆相叠合盆地,近年来相继在川东北地区发现多个生物礁滩气藏,其中上二叠统长兴组发育储集性较好的白云岩储层。通过对重庆满月乡野外剖面观察取样,以及对储层岩石薄片、铸体薄片镜下观察,物性分析等实验,明确了重庆满月乡剖面上二叠统分层特征以及长兴组储层的岩石学及储集物性特征。重庆满月乡上二叠统剖面主要划分为吴家坪组和长兴组,与下伏中二叠统茅口组地层整合接触,与上覆下三叠统大冶组平行不整合接触。储层段主要发育在长兴组上段,平均孔隙度为3.27%,平均渗透率为2.7011 mD。长兴组储层主要孔隙类型以粒间溶孔、粒内溶孔和晶间溶孔为主,其次为少量铸模孔、生物格架孔以及裂缝。川东地区二叠系储层以长兴组的白云岩储层为主,其中以残余鲕粒白云岩及粉晶白云岩为主,生屑灰岩、藻粘结灰岩等灰岩储层次之。长兴组碳酸盐岩储层主要受控于沉积微相、成岩作用及构造作用等共同影响。Sichuan basin,as a large Marine and continental superimposed basin in China,has found several biohermal and shoal gas reservoirs in northeast sichuan in recent years,among which the upper Permian changxing formation has a well developed dolomite reservoir.The stratification characteristics of upper Permian strata and the petrology and reservoir physical properties of changxing formation in chongqing were determined through field section observation and sampling,microscopic observation of thin sections of rock and casting,and physical properties analysis.The upper Permian section of shenyue township in chongqing is mainly divided into wujiaping formation and changxing formation,which are in conformity with the lower middle Permian maokou formation and in parallel unconformity with the upper lower Triassic daye formation.The reservoir was mainly developed in the upper part of changxing formation,with an average porosity of 3.27%and an average permeability of 2.7011mD.The main pore types of changxing formation are mainly intergranular,intergranular and intercrystalline,followed by a small number of mold holes,biologic lattice holes and fractures.The Permian reservoirs in eastern sichuan area are mainly composed of dolomite reservoirs of changxing formation,which are mainly composed of residual oolitic dolomite and powdery crystal dolomite.The carbonate reservoir of Changxing formation is mainly controlled by sedimentary microfacies,diagenesis and tectonism.

关 键 词：四川盆地东部 重庆满月乡剖面 长兴组 碳酸盐岩储层 

分 类 号：P618.130.2[天文地球—矿床学]