新疆准东煤田库兰喀孜干勘查区赋煤特征分析

该文以准东东部库兰喀孜干勘查区煤田钻探资料和勘探成果资料为基础,对区内煤炭资源分布特点、赋存特征和赋煤规律等方面进行了研究。区内主要含煤地层为中侏罗统西山窑组和下侏罗统八道湾组,含煤层23层,西山窑组19层,平均厚度45.55m,八道湾组3层,总厚度7.30m,其中2,9,13,15,17,21,23煤层为可采煤层,结合煤层厚度、岩性特征和测井结果,对区内煤层进行了对比。同时,从剖面纵向上总结了西山窑组和八道湾组煤层的垂向分布特征、含煤特征,总结了二者的平面展布特征,认为西山窑组煤层总厚度呈中间厚、四周薄的趋势,八道湾组煤层仅分布在井田中部和南部,厚度由南向北逐渐变薄。在此基础上,从沉积学特征、构造环境和沉积环境方面,对赋煤规律进行了浅析,认为煤层发育总体受沉积环境和基底沉降等地质条件的控制。

Analysis on Coalaccumulation Characteristics in Kulankazgan Exploration Area in Eastern Junggar Coalfield of Xinjiang Uygur Autonomous Region

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.