礁滩气藏产水来源分析与识别

Analysis and identification of producing water source in reef-bank gas reservoirs

陈林 张友彩 唐涛 苏静 季春海 王炯

成都理工大学能源学院，四川 成都 610059 中国石油西南油气田公司川中油气矿，四川 遂宁 629000

College of Energy Resources, Chengdu University of Technology, Chengdu 610059, China Central Sichuan Oil-Gas Field of Southwest Oil and Gas Field Company, PetroChina, Suining 629000, China

气井产水严重影响着礁滩气藏的有效开发，为了掌控有水气藏开发的主动权，应及时对产水来源进行识别。文中以四川盆地龙岗礁滩气藏飞仙关组为研究对象，在测试、计算天然气饱和凝析水体积分数的基础上，分析了气井的产水特征及产出水化学特征。分析结果表明：凝析水的矿化度、Na+/Cl-系数及Cl-，K++Na+质量浓度与地层水有明显区别；在气田开发过程中，气井产出水的上述各化学特征指标与生产水气比的变化趋势一致。据此建立了适于该气藏的产水来源判别指标体系，并确定了划分界限。应用结果表明，该综合判别方法操作简便，符合率高，可为气田的有效开发提供技术依据。

Producing water in gas well will influence the production of reef-bank gas reservoirs. The identification of producing water source in time is the premise condition to gain the initiative with the exploitation of gas reservoir with water. Taking the Feixianguan Formation Longgang reef-bank gas reservoir in Sichuan Basin as an example, this paper analyzes the water producing characteristics and the chemical characteristics of produced water based on the experimental tests or calculation of the volumetric fraction of saturated condensate water in gas. The results show that condensate water and formation water are different in salinity, coefficient of Na+/Cl- and concentrations of Cl- and K++Na+, all of them have the same changing trend with WGR. The index system for identification of producing water source has been established and the distinction lines have been determined. The application results show that the synthetic discriminant method is easy to operate with high coincidence rate, which can provide technical basis to develop gas field effectively.

10.6056/dkyqt201304018