新疆三塘湖盆地低煤阶煤层气成因探讨  

Discussion on Genesis Low Coal Rank Coalbed Methane in Santanghu Basin of Xinjiang Province

作　　者：吴斌 周龙刚[2] 潘新志[2] 张耀选 杜世涛 Wu Bin;Zhou Longgang;Pan Xinzhi;Zhang Yaoxuan;Du Shitao(Xinjiang Coal Geological Exploration Bureau,Urumqi,Xinjiang 830009,China;CNOOC EnerTech-Drilling&Production Company,Tianjin 300457,China;Xinjiang Geological Exploration Fund Management Center,Urumchi,Xinjiang 830001,China)

机构地区：[1]新疆维吾尔自治区煤田地质局,新疆乌鲁木齐830009 [2]中海油能源发展股份有限公司,天津300457 [3]新疆地质勘查基金项目管理中心,新疆乌鲁木齐830001

出　　处：《特种油气藏》2020年第1期47-54,共8页Special Oil & Gas Reservoirs

基　　金：新疆维吾尔自治区地质勘查基金“新疆巴里坤—伊吾县三塘湖盆地煤层气资源普查”（N16-2-LQ23）

摘　　要：针对新疆三塘湖盆地煤层气生产试验井产量较低的问题,通过对煤层特征分析、含气量测试、甲烷同位素化验等实验数据进行分析,结合盆地煤及煤层气成因模板及数值模拟,根据煤层气地质理论并结合地质分析,对盆地汉水泉、条湖、淖毛湖三大凹陷煤层气成因类型进行了判别分析。结果表明:汉水泉、条湖凹陷深部煤层Ro为0.80%,其中,1000 m以浅9号煤层生烃强度为18.6 m^3/t,26~35号煤层R o平均为0.52%,生烃强度平均为39.2 m^3/t,主要为热成因气;淖毛湖区块R o为0.26%~0.50%,平均为0.34%,含气量为4~10 m^3/t,以生物成因气为主,背斜轴部附近为高含气区。该研究可为三塘湖盆地煤层气进一步科学高效开发提供参考。In order to enhance the low CBM production of production test well in Santanghu Basin of Xinjiang Province,the coal reservoir,gas content test and isotope data were analyzed by combining with the geneses of coal and CBM and numerical simulation.According to CBM geology theory,the CBM geneses of 3 major depressions in the basin were analyzed by combining with geology analysis,including Hanshuiquan,Tiaohu and Naomaohu depressions.Research indicates that the R o of deep coal in Hanshuiquan and Tiaohu Sag is 0.80%.The hydrocarbon generation intensity of the No.9 coal reservoir with a buried depth less than 1000 m is 18.6 m^3/d.The average R o of No.26~No.36 coal reservoir is 0.52%and the corresponding average hydrocarbon generation intensity is 39.2 m^3/t,which is dominated by thermogenic gas.The R o in the Block Naomaohu is 0.26%~0.50%with 0.34%on average.The gas content is 4~10 m^3/t and it is dominated by biogenic gas.The zone near the anticline axis shows a higher gas content.This research could provide certain reference for further scientific and efficient development of this block.

关 键 词：煤层气 低煤阶 生烃强度 热成因气 生物成因气 三塘湖盆地 

分 类 号：TE121.1[石油与天然气工程—油气勘探]