1. China United Coalbed Methane Corporation Ltd. ,Beijing　 100011,China;2. Key Laboratory of CBM Resources and Reservoir Process,Ministry of Educa-tion,China University of Mining & Technology,Xuzhou　 221116,China

深部条件下煤储层关键参数的识别是煤层气开发评价的基础。基于鄂尔多斯东缘临兴区块深部煤层气勘探和测试研究结果显示:朗格缪尔体积随镜质组反射率的增大先增加后减小,朗格缪尔压力与镜质组反射率呈"U"型变化,两者均在2.5%Ro,max左右出现转折。采用非线性分析方法,基于实测含气饱和度与煤层埋深的关系,建立了含校正系数的深部煤层含气量计算模型。山西组4+5号煤层预测含气量6.7~22.1 m3/t;本溪组8+9号煤层含气量在12~20 m3/t,在平面上总体均呈东低西高展布。4+5号煤预测临界解吸压力介于1.03~9.40 MPa,临储比介于0.11~0.63,平均为0.33;8+9号煤预测临界解吸压力介于1.27~10.47 MPa,临储比介于0.12~0.64,平均0.334。在平面上,4+5号煤临界解吸压力与临储比均呈西高东低、西北部最高展布,而8+9号煤总体呈北高南低展布。

Key parameters identification for deep coalbed methane reservoir is a basis for its development. Based on the deep coalbed methane exploration and experiments in Linxing block of eastern Ordos basin,Langmuir volume increases and then decreases with vitrinite reflectance,Langmuir pressure varies like U-type with vitrinite reflectance,and the transform point of both is around 2. 5% Ro,max . Using nonlinear fitting method,a prediction model for deep coalbed methane content was established,and the correction coefficients deduced from relationship between measured gas satu- ration and burial depth were added into the model to assure the accuracy of the model. Gas contents of No. 4+5 coal in Shanxi formation vary between 6. 7 and 22. 1 m3 / t,while those of No. 8+9 coal in Benxi formation change from 12 to 20 m3 / t. The gas contents distribute as high in west and low in east. Critical desorption pressure of No. 4+5 coal vary between 1. 03 and 9. 4 MPa,and the ratios of critical desorption pressure and reservoir pressure change from 0. 11 to 0. 63,and averaged value is 0. 33. Critical desorption pressure of No. 8 +9 coal vary between 1. 27 and 10. 47 MPa, and the ratios of critical desorption pressure and reservoir pressure change from 0. 12 to 0. 64,and averaged value is 0． 334. Critical desorption pressure and ratios of critical desorption pressure and reservoir pressure of No. 4+5 coal distribute like high in west,low in east and highest in north-west,while those of No. 8+9 coal distribute as high in north and low in south.

国家科技重大专项资助项目(2011ZX05042)；国家自然科学基金青年基金资助项目(41302131)；

Zhang Bing,Xu Wenjun,Xu Yanyong,et al. Key parameters identification for deep coalbed methane reservoir in Linxing block of eastern Ordos Basin[J]. Journal of China Coal Society,2016,41(1):87-93.