Xi'an Research Institute Company Limited,China Coal Technology and Engineering Group

为了研究鄂尔多斯盆地侏罗系低煤阶煤含气量的分布特点,及其对煤层气资源评价的意义,采用数理统计和系统论的方法,对煤层含气性的分布与组成特点、煤中游离气的预测、煤层气资源量计算进行了研究,结果表明:鄂尔多斯盆地煤层含气量在全国低煤阶煤层气含量中位居中等,其中解吸气含量0.11~4.33 m3/t,损失气约占总含气量的20%,而残余气含量一般小于5%。游离气占总含气量的11.96%~48.16%,游离气所占比例多少与煤的孔隙度和保存条件有关。以成煤系统划分的单元作为煤层气评价单元,采用体积法计算的盆地内煤层气资源总量为75 833.62×108m3。

In order to study the gas content distribution features of the Jurassic low rank seam in Ordos Basin and the evaluation significances of the coal bed methan e resources,a mathematical statistics and system theory method was applied to a study on the coal bed methane potential and the composition features,prediction of free g as in the coal and the calculation of the coal bed methane resource volume.The results showed that the coal bed methane potential in Ordos Basin was in middle grade of t he national low rank coal bed methane potential,the desorption gas content was 0.11 ~ 4.33 m3/ t,the lost gas was about 20% of the total gas content,the residual gas wa S less than5% generally,the free gas was 11. 96% ~ 48. 16% of the total gas content,the percentage of the free gas was related to the coal porosity and preservation condit ions. Based on a unit divided from the coal system as the unit of the coal bed methane evaluation,the total volume of the coal bend methane resource calculated with the V olume method was 75 833.62 x 108m3.

国家科技重大专项资助项目(2011ZX05033-002)；