中东地区Y油藏微观孔隙结构及渗流特征研究  

Research on Micro-pore Structure and Percolation Feature of Y Reservoir in the Middle East

作　　者：高敏[1] 

机构地区：[1]中国石化石油勘探开发研究院,北京100083

出　　处：《科学技术与工程》2016年第28期56-62,共7页Science Technology and Engineering

基　　金：国家重大科技专项项目(2011ZX05031)资助

摘　　要：Y油藏位于中东地区的扎格罗斯盆地,属于中低孔、低渗透碳酸盐岩油藏,受成岩作用影响大、非均质性强,含油层系为上部的S组和下部的F组。S组埋深2 750～3 500 m,岩性主要为层状灰岩;F组埋深4100～4500 m,岩性以厚层状灰岩、生物碎屑灰岩和鲕粒灰岩为主。基于岩心X-CT图像和数字岩心分析方法,开展了识别储层的孔隙、溶孔、裂缝的研究,进行了渗流机理实验研究,分析了Y油藏的渗流特征。用Amott方法研究了储层岩石的润湿性,得到了Y油藏的孔隙结构特征、润湿性、渗透性及孔渗关系等特征。研究得出S组和F组储层储集空间类型具有多样性,且储层内整体上随着孔隙度增大,渗透率也增大;但从整体上看孔、渗之间相关性差,而孔隙型岩样有着较好的孔、渗之间相关性。这些认识对类似油藏的孔隙结构及渗流特征研究,具有一定的借鉴意义。Y reservoir is located in the Zagros basin of the Middle East, which is low porosity and low permea- bility carbonate reservoir. It is a heterogeneous reservoir which is strongly influenced by diagenesis. The upper group S and lower group F are the oil-bearing strata of Y reservoir. The S group reservoir is 2 750 - 3 500 m deep, which lithology is mainly composed of layered limestone. The F Group reservoir is 4 100 ~4 500 m deep, which li- thology is mainly composed of thick layered limestone, bioclastic limestone and Oolitic Limestone. The study of res- ervoir pore, dissolved pore and fracture are carried out by means of X-CT image and digital core analysis. The per- colation characteristics of Y reservoir are analyzed through the experimental study of percolation mechanism. The wettability of reservoir rocks was studied by Amont method. The characteristics of pore structure, wettability, per- meability and porosity and permeability of Y reservoir are obtained by the above experiments. It is concluded that the reservoir space types of S group and F group are diversity, and the permeability is also increased with the increase of porosity. But in the whole, the correlation between the pore and permeability is poor, It is different from the general rock pore type has a good correlation between porosity and permeability. These studies have certain ref- erence significance for the study of pore structure and percolation characteristics of similar reservoirs

关 键 词：孔隙结构 渗流特征 碳酸盐岩 渗透率 

分 类 号：TE312[石油与天然气工程—油气田开发工程]