赵庄井田3~#煤层含气量的地质控制因素分析

发布时间：2018-12-31 17:58

【摘要】：基于沁水盆地南部赵庄井田3号煤层的含气特征,从煤岩煤质、煤阶、有效地层厚度、地质构造、水文地质条件等方面探讨了影响该区煤层含气量的地质控制因素。结果表明:井田内煤层含气量具有由西北向东南逐渐降低的趋势,甲烷浓度变化较大、含气饱和度偏低的特点。宏观上,煤层含气量与有效地层厚度、上覆岩层泥岩比例呈明显的正相关性,局部地区含气量受次级构造影响,具有典型的构造控气特征,地下水对煤层气具有封堵作用,有利于煤层气的保存,只有在局部构造带水力逸散作用使煤层含气量降低。微观上,煤层含气量随挥发分产率、水分+灰分含量的增加具有先增大后减小的趋势,煤层含气量与氮气含量具有此消彼长的关系,在重烃含量高的地区煤层含气量也普遍较低。
[Abstract]:Based on the gas-bearing characteristics of No. 3 coal seam in Zhaozhuang mine field, southern Qinshui Basin, the geological control factors affecting the gas content of coal seam in this area are discussed from the aspects of coal quality, coal rank, effective stratum thickness, geological structure, hydrogeological conditions and so on. The results show that the gas content of coal seam in the mine field decreases gradually from northwest to southeast, the methane concentration changes greatly and the gas saturation is low. Macroscopically, the gas content of coal seam is positively correlated with the effective formation thickness and the ratio of overlying mudstone, the gas content in local area is affected by secondary structure, and the gas content in local area is affected by secondary structure, which has typical characteristics of structural gas control, and groundwater has plugging effect on coalbed methane. It is beneficial to the preservation of coalbed methane, only in the local structural zone hydraulic fugacity to reduce the gas content of coal seam. Microscopically, the gas content of coal seam increases first and then decreases with the increase of volatile yield and ash content, and the gas content of coal seam has the relation of rising and falling with nitrogen content. In areas with high hydrocarbon content, the gas content of coal seam is generally low.
【作者单位】：煤与煤层气共采国家重点实验室;易安蓝焰煤与煤层气共采技术有限责任公司;山西蓝焰煤层气集团有限责任公司;
【基金】：“十三五”国家科技重大专项资助项目(2016ZX05067001-008) 山西省科技重大专项资助项目(MQ2016-01)
【分类号】：TD712

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