基于多层次模糊综合评价的多层煤层气合采层位优选研究

Study on Layer Selection of Multi-layer Coalbed Methane Co-production Based on Multi-level Fuzzy Comprehensive Evaluation

为了避免或减弱多层煤层气藏合采时的层间干扰现象,选择合适的合采层位至关重要。为此,在综合分析多层煤层气合采层间干扰影响因素基础上,提出了层间干扰性指标,基于多层次模糊综合评价理论,结合已有的煤层气选区评价指标,建立了以资源条件、开采条件、层间干扰性为二级指标的多层次指标体系,以及煤层气双层合采模糊综合评价模型。并以H煤层气田为对象,对其不同层位两两组合进行了合采层位优选模糊综合评价,评价结果与实际合采效果相一致。该研究为多层煤层气藏合采层位的优选及成功合采提供了理论支撑。

In order to avoid or weaken the interlayer interference phenomenon in multi-layer coalbed methane reservoirs,it is important to choose a suitable joint mining horizon.Therefore,based on the comprehensive analysis of the factors affecting the interference between multi-layer coalbed methane reservoirs,the inter-layer interference degree index was proposed.Based on the multi-level fuzzy comprehensive evaluation theory,combined with the existing evaluation index of coalbed methane selection,a multi-level index system with resource conditions,mining conditions and inter-layer interference as the secondary indicators was established.And a fuzzy comprehensive evaluation model for coalbed methane double-layer mining was established too.Taking H coalbed gas field as the object,the fuzzy comprehensive evaluation of the combined layer location was carried out for different layer combinations.The evaluation results are consistent with the actual combined mining results.This study provides theoretical support for the optimization and successful mining of multi-layer coalbed methane reservoirs.