渝东彭水廖家槽上震旦统灯影组储层特征研究

通过对宜昌莲沱上震旦统灯影组的野外剖面踏勘观察描述,研究了该地层分布及沉积发育特征。剖面显示渝东彭水廖家槽灯影组主要为一套潮坪环境沉积的白云岩,共划分为3个岩性段、4个三级旋回层序。研究区内灯影组储集岩以晶粒白云岩、藻纹层云岩和残余砂屑、鲕粒云岩为主。讨论了储层发育特征及有利储层类型,找出了储层发育的控制因素及分布规律,预测了储层发育的有利地带。认为储集空间类型主要有晶间溶孔、溶洞、裂缝等,属于白云岩储层和古岩溶型碳酸盐岩储层。以此为基础预测出该相带控制的研究区的物性特征较好,储层类型较好。

Study of the reservoir characteristics of Dengying Formation in Liaojiacao,east of Chongqing

According to the seismic sections for the Dengying Formation of the Upper Sinian in liantuo,Yichang,the distribution and development features of the sed-imentary strata are researched. The sections shows that the Dengying Formation of Liao Jiacao in Pengshui in the east of Chongqing mainly dolomite developed in tidal-flat environment,it is divided into three lithologic characters and four third class cyclic sequences. The reservoir rocks of the Dengying Formation in the study area are mainly grain dolomite,algal laminae dolomite and residual sand debris,oolites dolomite. The features of reservoir development and the types of favorable reservoir are discussed. The controlling factors for the reservoir development and their distribution rules are found out,the favorable reservoirs area are predicted. The reservoir spatial types are mainly intergranular dissolution holes,caves,cracks,etc. which belong to dolomite reservoir layer and ancient karst carbonate reservoir. Based on these,the physical properties and reservoir types are favorable in the area.