煤层气关键储层性质评价技术探析

Study on Evaluation Methods for Coalbed Methane Key Reservoir Properties

煤层气在国际范围内已经成为常规天然气的重要接替资源,开发前景广阔。然而由于煤层气储层的复杂性和特殊性,导致对其关键性质的认识程度不足,给煤层气井生产动态分析和产量预测造成了很大困难,制约了煤层气藏的开发效果。通过调研煤层气储层性质和增产措施效果评价技术,总结了压力瞬态分析技术、含气量确定和物质平衡等方法的应用和进展,探讨了以上方法对评价煤层气关键储层性质(如绝对渗透率和含气量、气体地质储量)以及完井和增产效果的影响。

Coalbed methane（CBM） has become an important alternative for conventional natural gas with a promising prospect.However,due to the complexity and unique property of CBM reservoir,only a limited understanding was obtained,causing major difficulty for CBM well performance and production prediction,and leading to an unsatisfied development effect.By investigating CBM reservoir property and stimulation effect evaluation methods,the application and advances of pressure transient analysis（PTA）,gas content determination and material-balance method are summarized.And the influences of the above methods on evaluating key reservoir properties（absolute permeability,original gas in place） and stimulation effect are discussed.