元坝气田长兴组气藏含水饱和度计算  

Calculation on water saturation of Changxing Formation reservoir in Yuanba Gas Field

作　　者：高红贤[1] 冯明刚[1] 王建波[1] 田雨[1] 刘帅[1] 

机构地区：[1]中国石化勘探南方分公司研究院,四川成都610041

出　　处：《断块油气田》2014年第3期348-351,共4页Fault-Block Oil & Gas Field

基　　金：国家科技重大专项课题"南方海相层系油气成藏与富集规律研究"(2011ZX05005-003)

摘　　要：元坝地区含水饱和度的计算一直是困扰储层评价的技术难题。孔隙度、孔隙结构、围压、地层水矿化度、温度是影响含水饱和度准确计算的主要因素。根据储层特点选取合适的饱和度计算参数,提高含水饱和度解释精度是十分必要的。文中以Archie公式为基础,结合区域地质特点和川东北地区礁滩储层岩电分析资料,求取接近储层地层水矿化度条件下的胶结指数m及饱和度指数n,并对影响因素分析和优化,得到适合该区实际情况的含水饱和度计算模型,对比密闭取心含水饱和度分析,误差较小,说明该模型精度较好,适用于计算该区的含水饱和度。Calculation of water saturation in carbonate reservoir is always difficult in Yuanba Area. Porosity, pore structure, confining pressure, formation water salinity and temperature are primary controlling factors for the calculation of water saturation. According to the characteristics of different reservoir, the establishment of suitable interpretation model is very necessary in accurately identifying gas reservoir and improving the calculation precision of reservoir parameters. On the basis of Archie formula, combing with the regional geological features and the petrophysical-electrical experiments of bioreef-shoal reservoir in northeast Sichuan Basin, this paper calculates the cementation exponent m and saturation exponent n, which are closing to the reservoir water salinities. Through comparing the calculated value of water saturation with the value of sealed core analysis, it shows that the model has high precision and is suited for our research zone.

关 键 词：胶结指数 饱和度指数 含水饱和度 长兴组 元坝气田 

分 类 号：TE155[石油与天然气工程—油气勘探]