辽河盆地东部凹陷煤层气勘探选区模糊综合评价

辽河盆地是我国煤、油、气共生盆地之一, 东部凹陷煤层具有发育面积广、厚度大、变质程度较低、埋藏较深等特点。开展东部凹陷煤层气选区评价, 对于优选煤层气有利勘探区, 实现该区非常规煤层气与常规石油天然气共采具有重要意义。选取煤层累计厚度、含气量、含气饱和度、煤层气储量丰度、煤层连续性和盖层条件作为评价因素, 建立了适合研究区的模糊综合评价模型, 并在此基础上, 应用模糊综合评判方法对东部凹陷煤层气选区进行综合评价。结果表明, 热河台-三界泡区和欧利坨子区为有利区, 其中, 热河台-三界泡区煤层具有厚度大、连续性好、埋深较浅等有利因素, 是东部凹陷煤层气最有利勘探区。

Fuzzy Comprehensive Appraisement of Selected Areas for Coalbed Mathane in Eastern Sag of Liaohe Basin

Liaohe basin is one of domestic basins with coal, oil and gas resources. Its eastern sag contains coal bed that has characteristics of wide distribution, big thickness, low metamorphic grade and deep buried depth. It is significant to appraise the selected areas of coalbed methane in this sag for optimizing the exploratory areas and developing the conventional oil-gas and non-conventional coalbed methane resources. This paper chooses the coalbed cumulative thickness, gas content, gas saturation, reserves abundance of coalbed methane, coalbed continuity and cap rock condition as factors for assessment to develop a fuzzy comprehensive appraisement model adaptable to the studied area. The assessment result indicates that Rehetai-Sanjiepao area and Oulituozi area in the eastern sag are more favorable, the former is of big thickness, good continuity and shallow buried depth of coal bed, being as the most favorable area for coalbed methane exploration in this sag.