大倾角储层煤层气多层合采产量控制地质与工程因素

针对大倾角储层煤层气多层合采的特点，以库拜煤田煤层气井的实际排采动态资料为基础，通过分析排采动态典型指标与地质要素和工程要素之间的关系，剖析了库拜煤田大倾角储层多层合采煤层气井产能的控制因素，并用灰色关联分析定量评价了各影响因素的重要性。结果表明：（1）大倾角储层煤层气合层排采产量与单井动用资源丰度、储层压力梯度、煤体结构、临界解吸压力、初始排水速度、压裂效果、初始见气时间具有较好的相关性，但与渗透率、吸附时间相关性较差。储层压力梯度和储层压力是影响该研究区产能的主控因素；（2）新疆库拜煤田大倾角储层靶点压力特征、含气量、渗透率基本处于同一水平，同埋深不同煤层物性非均质性较小，层间干扰作用小，较适合合层排采。论文研究成果可作为大倾角储层煤层气合层排采提供指导。

Geological and Engineering controlling factors of multi-layer combined production capacity of steeply inclined coal reservoir

According to the characteristics of multi-layer combined mining of coalbed methane in steeply inclined reservoir in Kubai coalfield, based on the actual drainage dynamic data of coalbed methane wells the control factors of gas well productivity in multi-layer combined mining of coalbed methane in steeply inclined reservoir in Kubai coalfield were analyzed by analyzing the relationship between typical drainage dynamic indexes and geological factors and engineering factors, and the importance of each influencing factor was quantitatively evaluated by grey correlation analysis. The results showed that: (1) the productivity in this area had a good correlation with single well production resource abundance, reservoir pressure gradient, coal structure, critical desorption pressure, initial drainage velocity, fracturing effect, and initial gas breakthrough time, but had a poor correlation with permeability and adsorption time. It was considered that the reservoir pressure gradient and reservoir pressure were the main controlling factors affecting the productivity of the study area; (2) The pressure characteristics, gas content and permeability of steeply inclined target reservoirs in Kubai coalfield, Xinjiang are basically at the same level. The physical heterogeneity of coal seams with different buried depths is small, and the interlayer interference is small as well, which is more suitable for combined layer drainage. The research results can provide theoretical guidance for the combined mining of coalbed methane in steeply inclined reservoir.