煤层气储层产水量的分类和成因分析

Analysis of classification and causes of water production in CBM reservoir

利用统计分析、数值模拟手段将煤层气储层按照日产水量的多少分为四种类型,即：日产水量在1 m^3 以下的为特低产水煤层气储层,日产水量在1-5 m^3 的为低产水煤层气储层,日产水量在5-20 m^3 的为中产水煤层气储层,日产水量在20 m^3 以上的为高产水煤层气储层.深入分析了煤层气储层高产水、低产水的成因,发现含水层富水性与构造条件以及压裂措施是煤层气储层高产水的主要控制因素,煤层气储层物性是煤层气储层低产水的主要控制因素,同时排采模式等也间接影响着煤层气储层的产水量.进一步给出了产气量不理想情况下的高产水、特低产水煤层气储层的开发建议.

With the methods of statistical analysis and numerical simulation, this study classifies CBM reservoir into 4 types by water production, namely: ultra-low water production CBM reservoir with under 1m3 water production per day, low water production CBM reservoir with 1~5m3 water production per day, medium water production CBM reservoir with 5~20 m3 water production per day, high water production CBM reservoir with over 20m3water production per day. The causes of high water production and low water production in CBM reservoir were analyzed deeply, finding out that the property of the coal seam roof aquifer, the tectonic conditions of the CBM reservoir and the fracturing measures mainly causes high water production in CBM reservoir, the physical property of the CBM reservoir mainly causes low water production in CBM reservoir, at the same time, producing institution also has an indirect effect on the water production in CBM reservoir. Then this study gives further suggestions on the development of CBM reservoir with high water production, ultra-low water production and unsatisfied gas production.