准噶尔盆地南缘页岩气形成条件与有利区预测
Formation conditions and favorable exploration zones of shale gas on the southern margin of Junggar Basin
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摘要: 通过对准噶尔盆地南缘泥页岩分布情况、厚度、面积、总有机碳含量、热演化程度、有机质类型、矿物岩石成分等因素的分析,确定了准噶尔盆地南缘侏罗系八道湾组、三工河组和西山窑组、二叠系芦草沟组、红雁池组以及石炭系是页岩气发育的有利层位。经过对有利层位的页岩气富集条件分析,并利用镜质体反射率(Ro)等值线、泥岩厚度等值线和总有机碳含量(TOC)等值线进行叠加的分析方法,最终确定霍玛吐背斜带西北缘、沙湾凹陷和莫南凸起三者过渡区域的侏罗纪地层,阜康凹陷与阜康断裂带过渡区域的侏罗纪地层,柴窝堡坳陷达坂城凹陷和永丰凹陷二叠纪地层埋藏较浅处,以及齐古断褶带石炭纪地层埋藏较浅处等4处为页岩的有利发育区。Abstract: Based on analyzing the distribution, thickness, area, total organic carbon content, thermal evolution, type of organic matter and petrographic composition of the shale on the southern margin of Junggar Basin, the authors hold that the Jurassic Badaowan, Sangonghe and Xishanyao Formation, the Permian Lucaogou Formation, Hongyanchi Formation and the Carboniferous strata are favorable formations for shale gas exploration. Through an analysis of enrichment conditions of favorable horizons of shale gas and by using the method of superimposing vitrinite reflectance (Ro) isoline, mudstone thickness isoline and total organic carbon content (TOC) contour, the authors determined that the Jurassic strata of the transition region of the northwestern margin of Homato anticline belt, Shawan sag and Monan convex, the Jurassic strata of transition region of Fukang sag and Fukang fracture belt, the Permian strata of Dabancheng sag and Yongfeng sag with shallow buried depth in Chaiwopu depression and the Carboniferous strata of Qigu fault fold zone with shallow buried depth ae favorable places for shale gas exploration.
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