河西走廊煤层气储层特征及控气地质因素分析  

CBM Reservoir Features and Methane Control Factor Analysis in Hexi Corridor

作　　者：贾秉义 晋香兰 吴敏杰 Jia Bingyi;Jin Xianglan;Wu Minjie(Xi'an Research Institute,China Coal Technology and Engineering Group,Xi'an,Shaanxi 710077;College of Safety Science and Engineering,Xi'an University of Science and Technology,Xi'an,Shaanxi 710054)

机构地区：[1]中煤科工集团西安研究院有限公司,西安710077 [2]西安科技大学安全科学与工程学院,西安710054

出　　处：《中国煤炭地质》2021年第11期34-41,共8页Coal Geology of China

摘　　要：河西走廊地质条件复杂,含煤地层较多。研究表明中侏罗统聚煤环境较稳定,沉积条件较优越,大部分含气区带及含气区块形成的煤层厚度大,层数多,成煤物质类型相对较好,为煤层气的形成提供了较好的物质条件。研究区煤层含气量实测数据较少,部分矿井瓦斯涌出量折算含气量0.124~4.37m^(3)/t。所采集的煤样的煤储层孔隙分布相对比较复杂,具有双峰式、微孔占主导型两个特点。煤储层吸附能力自东向西基本呈降低的趋势。研究区受构造改造强烈,现今残留含气区块分布零星,面积小,不利于煤层气的生成,保存和富集。煤层变质程度和埋藏深度是影响该区煤层含气性的主要地质因素。Geological conditions are complex in the Hexi Corridor with multiple coal-bearing strata.Studies have shown that coal accumulation environment was stable in the middle Jurassic with advantageous sedimentary conditions.Most methane-bearing zones and blocks have formed thick and multi-layer coal seams and relatively better coal-forming material types provided better material condition for CBM formation.Measured data of coal methane content in the study area are less;part of coalmines gas flow converted methane content is 0.124~4.37m^(3)/t.Acquired coal samples estimated coal reservoir porosity distribution is relatively complex with bimodal and micropore dominant two features.Coal reservoir adsorptivity has a trend of basically decreasing from east to west.From strong structural reform study area current residual methane-bearing blocks are sporadically distributed with small areas,disadvantage to CBM generation,preservation and enrichment.Coal seam degree of metamorphism and buried depth are two main geological factors impacting coal seam methane-bearing property in the area.

关 键 词：煤层气 储层特征 控气地质因素 河西走廊 

分 类 号：P618.3[天文地球—矿床学]