柴达木盆地北缘侏罗系含煤研究

A Study on Jurassic System in Northern Qaidam Basin

柴达木盆地北缘从西至东分布有格斯煤田、塞什腾煤田、鱼卡煤田、全吉煤田、德令哈煤田以及乌兰煤田,延展长度约800km。各含煤盆地的分布、地层、岩性、含煤性、岩相古地理特征均存在较大的差异,综合分析后可将柴北缘侏罗系含煤地层划分为西、中、东三段,中、东段进一步划分为北、中、南三个条带。区内含煤地层为侏罗系下统小煤沟组、中统大煤沟组、石门沟组,东段和西段下侏罗统发育,在中段则局部发育,中、东段的北、南两个条带下侏罗统发育不全,中条带下侏罗统发育较全;中侏罗统全区普遍发育;含煤性总体表现为西段较差,中段较好,南、北条带较差,中条带较好。探讨煤系赋存规律,为寻找隐覆的含煤区提供理论依据,对于指导柴北缘地区的预测找煤和资源勘查具有重要意义。

From west to east,in the northern Qaidam Basin have Gus,Sesten,Iqe,Quanji,Delingha and Ulan coalfields stretching about 800km.The distribution,strata,lithology,coal-bearing property,lithofacies and paleogeography of each coal-bearing basin have existed rather large differences.After overall analysis,the Jurassic coal-bearing strata can be partitioned into west,central and east three sectors,the later two can be further subdivided into north,central and south three belts.Coal-bearing strata in the area have lower Jurassic Xiaomeigou Formation,middle Jurassic Dameigou Formation,Shimengou Formation.Lower Jurassic Series was well developed in east and west sectors,locally developed in the central sector;north and south belts in central and east sectors have defective Lower Jurassic Series developed,while well developed in central belt;Middle Jurassic Series was generally developed in the whole area.In the mass,coal-bearing property is rather poor in west sector,better in middle sector;south and north belts rather poor,central belt better.To probe into coal measures hosting pattern,provide theoretical basis for covered coal-bearing area looking have important significance to coal prediction and resource exploration in northern Qaidam Basin.