陕西彬长矿区低阶煤地面煤层气开发方式

分析陕西省彬长矿区大佛寺井田的地质构造、煤层特征、储层渗透性、煤吸附特征、煤层含气量、煤层气资源潜力，研究地面煤层气开发方式的技术特点和适应性特征，采用数值模拟手段及煤层气CBM-SIM模拟软件对垂直井和多分支水平井在大佛寺井田的抽采效果进行了预测，为以后彬长矿区及国内其他类似地区的低阶煤地面煤层气开发提供了技术支撑和参考。陕西彬长矿区是我国典型的低阶煤矿区，4号煤层为主采煤层，煤层厚度大，含气量低，渗透性较好。测试结果表明，垂直井与水平井在大佛寺井田有着良好的抽采效果，垂直井单井最高日产气量2 221.26 m^3，5个分支的水平井最高日产气量超过25 000 m^3。在今后矿区煤层气开发中，应结合地质条件、抽采目的、开发工艺和投资成本等因素，选择最优开发方式。

SURFACE CBM DEVELOPMENT MODES OF LOW -RANK COAL IN BINCHANG COAL MINE IN SHAANXI PROVINCE

This paper analyzes the geological structures, coal bed features, reservoir permeability, adsorption, gas content, resource potential of Dafosi coal field, Binchang mining district, Shaanxi province, studies the technology and adaption of the surface CBM development modes, and applies simulation and software CBM-SIM  to forecast the extraction effects of the vertical and branching horizontal wells of Dafosi coal field, offering the technical references for surface CBM development of  low-rank coal in Binchang coal mine or for other similar coal mines. Binchang coal mine is of classic  low-rank coal with its No.4 coal bed as the major producing bed, thick, low gas content with high permeability. The test acquired a good extraction result, up to 2 221.26 m^3 per day in vertical wells, and over  25 000 m^3 among the five horizontal wells. This paper suggests selecting the premium mode to develop CBM or to manage coal gas based on geology, extraction objectives, developing technology and investment cost.