鄂尔多斯盆地煤层气实际产气压力分析  

Analysis on Actual Gas Production Pressure of Coalbed Methane in Ordos Basin

作　　者：薛晓辉[1] 丁安徐[1] 程伟[1] 龚月[1] 

机构地区：[1]中国石油化工股份有限公司华东分公司石油勘探开发研究院,江苏210000

出　　处：《中国煤层气》2013年第1期10-13,25,共5页China Coalbed Methane

摘　　要：煤层气临界解吸压力由煤的等温吸附实验得出,可以预测煤层气排采过程中的产气压力。结合煤层气赋存条件、等温吸附理论模型、临界解吸压力计算原理等,分析临界解吸压力实验值计算过程中的各步骤及其影响,根据已知地质资料、区域概况,总结区域误差规律。分析表明,鄂尔多斯盆地延川南区块煤层气临界解吸压力实验值普遍小于实际产气压力,差值在1.48～3.11MPa之间,统计平均差值为2.36MPa;基于修正参数进行了实例分析,验证了分析结果。根据区域数据资料分析,对区块内临界解吸压力进行统计,提出修正参数,优化实验结果,为煤层气的开发及排采提供更加可靠的依据。The critical desorption pressure of CBM is derived from coal isothermal adsorption experiment, which can predict the gas pressure in the coalbed methane drainage process. Regional error rule is summarized and important influence factors are screened by combining with coalbed methane accumulation conditions, adsorption isotherms of the theoretical model and critical desorption pressure calculation principle, and analyzing every step and influencing factors in the experimental values calculation of the critical desorption pressure based on geological data and regional situation. Analysis shows that CBM critical desorption pressure experimental values are generally less than the actual gas pressure, with the difference between 1.48～3.11 MPa, and the average difference of 2.36 MPa in south of Yanchuan Block, Ordos Basin. According to the regional data analysis, critical desorption pressure within the block is statistics for proposing a modified parameter, improving experiment process to optimize the experimental results and providing a more reliable basis for CBM development and drainage.

关 键 词：鄂尔多斯盆地 煤层气 临界解吸压力 实际产气压力 

分 类 号：P618.13[天文地球—矿床学]