类比技术在煤层气储量评估中的应用

Application of Analogy Technology to CBM Reserves Evaluation

煤层气独特的产出机理决定了其充分解吸产气需要较长的排采时间,难以在短时间内取得产能数据,影响了储量提交工作。利用实际生产资料,探讨了煤层气的产出规律,并对各种储量估算方法的特点和适用条件进行了讨论,在此基础上,提出采用类比技术,从地质背景、储层控制与资料录取齐全程度、煤层电性特征、产气煤层厚度、煤层含气量、储层物性和临/储比值这7个方面进行类比分析,以配合其他方法综合论证储量参数、采收率、产能潜力和储量估算,使结果更趋合理、科学和准确。该方法技术在实际中得到应用并取得了良好的效果。

Distinctive CBM generation law determines that to generate CBM by adequate desorption needs longer production time.So it is difficult to obtain productivity data in a short time,affecting reserves submission.This paper used practical production data to probe into CBM generation law and discuss the characteristics and suitable conditions of various reserves estimating methods.On this basis,it proposed the application of analogy technology,and conducted analogy analysis from geological background,reservoir control and sufficient data recording,electrical property of coal bed,thickness of coal bed producing CBM,CBM content,reservoir property,and the ratio of critical desorption pressure to coal reservoir pressure,so as to comprehensively verify reserves parameters,recovery ratio,productivity potential,and reserves estimation,and make the results more rational,scientific,and accurate.The analogy technology has been applied well in practice and achieved good results.