注入/压降试井与历史拟合在煤层气勘探开发中的应用

现以国内煤层气勘探开发成功的沁水盆地的晋城矿区为例,进行历史拟合修正煤储层渗透率参数,成庄井田平均渗透率1.51 md,寺河井田平均渗透率3.76md.在此基础上估算了成庄、寺河两井田3号煤层的煤层气探明储量分别为66.36×108 m3、23.28×108 m3.通过经济评价结果表明:该区煤层气开发工程经济评价指标良好,财务内部收益率22.2％、53.2％,动态投资回收期7.82a、4.36a,煤层气开发有较好的经济效益和较强的抗风险能力,地面煤层气开发可行.注入/压降试井与历史拟合方法为煤层气勘探开发及研究提供了基础依据.

Application of Injection/Fall-Off Test and History Matching in Coal Bed Methane Exploration:in Jincheng Mine Area Case

Taking the successful CBM exploration of Jincheng Mine in Qinshui Basin as an example,the history matching was used to correct the permeability parameters,1.51md in Chengzhuang mine and 3.76md in Sihe mine on average.On the basis,the proved reserves of No.3 seams of two mines are estimated as 66.36×108m3、23.28×108m3 respectively.The economic evaluating index is good and the financial internal rates of returns are 22.2% and 53.2%.The dynamic investment payback periods are 7.82 and 4.36 year.Therefore,the CBM exploration has better economic benefit and anti-risk capability and the surface CBM extraction is feasible.The result has been registered in Mineral Resources and Reserves Center,Ministry of Land and Resources.The injection/fall-off test and history matching provide the basis for CBM exploration and research.