摘要
针对沁水盆地南部山西组3#与太原组15#煤层煤层气合层排采'整体产能低'及'区域性差异大'的产能特征,探索适合合层排采的有利开发地质条件.以沁水盆地南部22口合层排采煤层气井的产气、产水资料,试井储层压力、试井渗透率、含气量等测试数据为依据,采用地质研究与探采测试数据分析相结合的方法,分析了不同地质因素对合层排采井产能特征的控制作用,提出了适合沁南3#与15#煤层合层排采的有利开发地质条件的参数指标.结果表明:平均埋深为500~650m;平均含气量大于14m3/t;储层压力梯度差小于0.08 MPa/hm;渗透率较高且差值不超过1mD;3#煤层的临界解吸压力高于15#煤层,且差值小于0.9MPa,满足合层排采的地质条件要求,可为今后进行规模性开发提供借鉴.
Aiming at the productivity characteristics of 'low overall productivity' and 'great regional difference' of CBM multi-layer drainage in Shanxi formation No.3and Taiyuan Formation No.15 coal seams in southern Qinshui basin,this paper attempts to explore favorable developing geological conditions for CBM multi-layer drainage.On the basis of the data obtained from 22multi-layer drainage wells in southern Qinshui basin,including water-production and gas-production characteristics,measurement results of well testing reservoir pressure,well testing permeability and gas content,the controlling action of different geological factors on productivity characteristics of CBM multi-layer drainage is analyzed by combining geological research with exploration and mining data analysis.Furthermore,the parameter index,which is fit for CBM multi-layer drainage of No.3and No.15 coal seams in southern Qinshui basin,are proposed.The results show that the average burial depth is approximately 500—650 m.The average gas content is greater than 14m3/t.The reservoir pressure gradient difference between two coal seams is lower than 0.08 MPa/hm.And the reservoir permeability of the two coal seams is higher and their difference is less than 1mD.The critical desorption pressure of No.3coal seam is higher than that of No.15 coal seam,and the difference is less than 0.9 MPa.These above favorable geological conditions well meet the CBM multi-layer drainage and pro-vide references for scale development of CBM in the future.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2014年第6期1019-1024,共6页
Journal of China University of Mining & Technology
基金
山西省煤层气联合基金项目(2012012001)
国家科技重大专项(2011ZX05034-004)
关键词
沁水盆地南部
煤层气
合层排采
控制因素
有利地质条件
southern Qinshui basin
CBM
multi-layer drainage
controlling factors
favorable geological conditions
