韩城矿区中高阶煤储层煤层气可解吸性及其影响因素研究

发布时间：2019-08-05 12:09

【摘要】：以韩城矿区煤心解吸数据为基础,分析了中高阶煤储层中煤层气解吸特征及规律,探讨了解吸特征与煤的变质程度、显微组分、工业组分等之间的关系。结果表明:研究区煤层气可解吸率介于13%~72%之间,5号煤层解吸速度最大;煤层气解吸具有阶段性,解吸速度的降低主要由煤储层含气量的变化引起,初始解吸速度及其衰减特征与煤岩孔隙结构及其连通性有关;可解吸率在区域上受埋深的影响,数据较为离散;可解吸率与煤变质程度相关性不明显,但随灰分产率增加而显著降低,随水分含量增加显著升高;镜质组含量的增加可以提高煤层气解吸率,而惰质组则相反。薛峰地区的5号煤层和11号煤层、王峰南部和魏东西部的5号煤层、魏东南部的11号煤层可解吸率较高,均大于50%,有利于煤层气的开发。
[Abstract]:Based on the desorption data of coal core in Hancheng mining area, the characteristics and laws of coal seam gas desorption in middle and high order coal reservoirs are analyzed, and the relationship between adsorption characteristics and coal metamorphism, microscopic components and industrial components is discussed. The results show that the desorption rate of coalbed methane in the study area is between 13% and 72%, and the desorption rate of No. 5 coal seam is the largest, and the decrease of desorption rate is mainly caused by the change of gas content in coal reservoir, the initial desorption rate and its attenuation characteristics are related to the pore structure and connectivity of coal and rock, and the desorption rate is affected by buried depth in the region, and the data are discrete. The correlation between desorption rate and coal metamorphism degree is not obvious, but it decreases significantly with the increase of ash content and increases significantly with the increase of water content. The increase of vitrinite content can increase the desorption rate of coal seam gas, while the inertinite group can increase the desorption rate of coal seam gas, but the increase of vitrinite content can increase the desorption rate of coal seam gas. The No. 5 coal seam and No. 11 coal seam in Xuefeng area, the No. 5 coal seam in the south of Wang Feng and the No. 5 coal seam in the east and west of Wei, and the No. 11 coal seam in the southeast of Wei have higher desorption rate, all of which are more than 50%, which is beneficial to the development of coalbed methane.
【作者单位】：中石油煤层气有限责任公司;
【基金】：中石油股份公司重大科技专项“煤层气资源潜力研究与甜点区评价”(2013E-2201) 国家科技重大专项“中高煤阶煤层气富集规律与有利区块预测”资助项目(2011ZX05033-001)
【分类号】：P618.13

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