1.School of Geology and Mining Engineering,Xinjiang University,Urumqi ,China;2.No.156 Geological Exploration Team, Xinjiang Coalfield Geology Bureau,Urumqi ,China

为了进一步探究塔里木盆地西南缘煤系分布不均衡的原因,找出聚煤作用主控因素,基于应用现代沉积学、煤田地质学、构造地质学等理论方法,通过分析康苏走滑拉分盆地和昆仑山前断陷盆地的充填与沉积特征,绘制了单井岩性剖面和莎里塔什、康苏组、杨叶组的沉积相展布图以及塔里木盆地西南缘侏罗系煤层厚度等值线图。研究结果表明:该盆地西南缘聚煤主控因素为幕式构造运动、沉积环境及气候,幕式构造运动决定了2个聚煤时期,沉积环境决定了煤层空间展布以及气候决定了富煤带的迁移;同时将塔西南地区侏罗纪盆地演化过程概括为:初始沉降期、首次聚煤期、聚煤迁移期、气候变化期、强烈沉降超覆期和强烈沉降推覆期6个阶段。

In order to further clarity the imbalance causes of coal measure distribution at the southwest edge of Tarim Basin and find the main control factors of the coal accumulation function,based on the application of the modern sedimentology,coalfield geology,tectonic geology and other theoretical method,with the analysis on the backfill and sedimentary characteristics of the Kangsu strike-slip pull-apart basin and the faulted basin in front of Kunlun Mountain,the lithological profiles of a single well,the sedimentary facies distribution diagrams of Shali Tashi Formation,Kangsu Formation,Yangye Formation as well as the thickness contour map of the Jurassic seam at the Southwest of Tarim Basin were drawn.The study results showed that the main control factors of the coal accumulation at the Southwest of the basin were the episodic tectonic movement,sedimentary environment and climate.The episodic tectonic movement determined two coal accumulation periods.The sedimentary environment determined a spatial distribution of the seam and the climate determined a migration of the coal-rich zone.Meanwhile,the evolution process of the Jurassic basin in the southwest area of Tarim Basin could be summarized as the initial settlement period,the first coal accumulation period,the coal accumulation migration period,the climate changing period,overlap period strong subsidence and six stages nappe period strong subsidence.