Abstract:Based on the drilling data and exploration achievements of eastern Junggar coalfield in Kulankazgan exploration area, distribution characteristics of coal, coalaccumulation characteristics and coalaccumulation regularities in this area have been studied comprehensively. Major coalbearing stratas are Xishanyao formation in middle Jurassic and the Badaowan formation in lower Jurassic. The number of total coal bearing strata is 23. Among them, 19 layers are in Xishanyao formation with the average thickness as 45.55m; while 3 layers are in Badaowan formation with the overall thickness as 7.30m. No.2, No.9, No.13, No.15, No.17, No.21 and No.23 coalbearing layers are workable strata. Combining with thickness, lithologic characteristics and logging results, coal strata have been compared. At the same time, distribution characteristics and coalbearing characteristics of Xishanyao formation and Badaowan formation have been summarized in vertical profile, and the distribution characteristics have been summarized as well. It is regarded that the thickness of coalbearing layers in Xishanyao formation has the trend of thicker in central part and thinner in the edges; while the coalbearing layers in Badaowan formation only locate in the middle and south of the exploration area, and the thickness is thinning from south to north. On this foundation, from the aspects of sedimentary characteristics, tectonic setting and depositional environment, it is thought that the development of coal strata is controlled by geological conditions, such as sedimentary environment and basement subsidence.
