Abstract:

This paper, based on Guizhou's Baibu coalfield's coalbed distribution, geology and resource, uses CBMSIM software to simulate the coalbed methane production capacity of the major coalbed, and analyzes its similarity with Guanzhai coalfield in reservoir and Guanzhai GZ01's ground coalbed methane test. Baibu coalfield owns many favorable conditions like many minable beds, high content of coalbed methane, high quality, good absorption, big resource and high concentration, but unfavorable in poor permeability, and lower pressure gradient. According to GZ01, Baibu may be of big production capacity where there are favorable geology and reservoir conditions. In general, Baibu coalfield is of good coalbed methane reservoir and geology, it is of potential to develop ground coalbed methane. This study offers technical supports and references for southwestern China in ground coalbed methane development and handling gas.

Key words: coalbed methane, reservoir features, production capacity forecast, developing potential, extraction curve, Baibu coalfield

摘要：

分析贵州白布井田的煤层分布、煤储层地质、煤层气资源特征，应用CBMSIM软件对主采煤层的煤层气产能进行预测模拟，并分析了储层条件相似的官寨井田GZ01地面煤层气井的开发试验效果，综合研究了白布井田地面煤层气开发潜力。白布井田煤层气成藏和开发地质条件较好，有利条件有可采煤层数多、厚度大，含气量较大，煤层气资源丰度较高；不利条件有煤层渗透性较差，储层压力偏低，属欠压储层。采用体积法估算，白布井田可采煤层煤层气资源总量为2905×108 m3，资源丰度为135×108 m3/km2。由产能预测及GZ01井排采效果判断，对白布井田进行地面煤层气开发，产气效果较好，尤其是地质、储层条件相对较有利的区块，开发前景良好，能源效益可观。研究成果可为今后西南地区地面煤层气开发以及煤矿瓦斯治理提供相应的技术支撑和参考依据。

关键词: 煤层气, 储层特征, 产能预测, 开发潜力, 排采曲线, 白布井田