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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 part of CBM reservoir logging evaluation. Based on the core data and well logging data in a certain area, the correlation analysis between gas content of coal seam and natural gamma ray, bulk density, acoustic time difference, neutron log and resistivity are carried out respectively. Well parameters (mainly natural gamma ray, bulk density and acoustic time difference), the composite logarithm of the three logging parameters are combined to obtain the composite number C, and then the correlation analysis between the gas content and the composite number C is performed to obtain the correlation coefficients Gas calculation formula. The results of logging interpretation of the gas content of an actual coalbed in an oilfield show that the predicted gas content in the coal seam is in good agreement with the measured gas content, thus confirming the effectiveness of the gas well logging evaluation model.