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本以六盘水煤层气勘探开发试验获得的实际资料为基础,结合国内外煤层气勘探开发成果,对其勘探开发前景进行了初步研究。指出该区具有煤层多,累计厚度大,煤阶类型多样;煤层含气量较产,煤层气资源量丰富;含气饱和度、临界解吸压力与地层压力的比值中等;煤层渗透性非均质性较强;煤层单层较薄,煤体结构较差;煤层地应力较高,杨氏模量较低及地形条件较差等特点。通过对上述特点的综合分析,章认为六盘水煤层气地质特征总体表现为煤层气资源条件优越,煤层气可采性较差;目前制约煤层气勘探开发的关键技术问题是选层技术、压裂技术和形成井网技术。建议继续六盘水煤层气勘探开发试验,并重点开展选层技术、压裂技术和形成井网技术的攻关研究。

Analyzing the Prospect of Coal-bed Methane Exploration and Development at Liupanshui

On the basis of the experimental data,a primary research on the prospect of coal bed methane exploration and development at Liupanshui is carried out in the paper in combination with the domestic and foreign coal bed methane exploration and development results.It is pointed out that this region is of these characters,such as there are a large number of coal beds with a great cumulative thickness and multiple coal rank;methane content in coal beds is relatively high with abundant methane resources;the gas saturation and the critical desorption pressure to formation pressure ratio are middling;the heterogeneity of coal bed permeability is relatively strong;single coal bed is thin and the coal body structure is bad;ground stress of the coal beds is relatively high and young's modulus is low;and topographic conditions are complicated;etc.Through comprehensively analyzing above mentioned characters,it is thought that the geological characteristics of coal bed methane at Liupanshui may be summarized as an advantageous coal bed methane resource condition and a bad coal bed methane recoverability;and the key techniques restricting coal bed methane exploration and development at present are horizon selected techniques,fracturing techniques,and well pattern formed techniques.Finally,it is suggested to continue the experiment of the coal bed methane exploration and development at Liupanshui and emphatically to carry out the key research on the horizon selected,fracturing and well pattern formed techniques.