煤层含气量的测井评价新方法

A New Logging Evaluation Method of Coalbed Gas Content

煤层含气量的计算是煤层气储层测井评价中的一项重要内容。本文利用某地区的岩心资料和测井数据,对煤层含气量与自然伽马、体积密度、声波时差、中子测井和电阻率分别进行相关分析,选择出与含气量相关系数较大的测井参数(主要是自然伽马、体积密度、声波时差),对这3个测井参数进行组合得到复合数C,然后再对含气量与复合数C进行相关分析,得到相关系数较大的含气量计算公式。某油田实际煤层的含气量测井解释结果表明,煤层预测含气量与实测含气量吻合较好,从而证实了该含气量测井评价模型的有效性。

Calculation of coalbed gas content is an important task in logging evaluation of coalbed gas reservoirs.In this paper,the core data and logging data of a region are used to do correlation analysis between coalbed gas content and GR,DEN,DT,CNL and R.Three logging parameters(GR,DEN,DT)are selected which have close relationship with gas content correlation coefficient.They are combined to obtain a composite number C,and then analysis of gas content and the number C is carried out to obtain the gas formula.The actual logging interpretation results show that the predicted gas content is consistent with the measured one.It has proved the logging evaluation model for gas content calculation is effcetive.