自三叠纪以来,天山造山带在南一北向应力场的作用下,产生了一系列山问盆地,例如吐鲁番-哈密盆地、库米什盆地等.在这些盆地中广泛发育了中、新生代陆相碎屑岩沉积,特别是侏罗纪的沉积.侏罗系除上统为红层外,主要由暗色岩石组成.这些暗色岩石包括灰色、黑色泥、页岩,碳质泥岩和煤层,它们都具有较强的生烃能力.对沉积和植物、孢粉化石等材料的综合分析表明,在早、中侏罗世,天山区为低山一丘陵面貌和湿润的古气候环境.这种环境有利于煤的聚集和暗色泥岩的沉积.%Since Triassic, Tianshan tectonic belt was compressed by stresses with strike of north-south to produce a series of intermountain basins, for example, Turpan-Hami basin, Kümüx basin, etc. In these basins the Mesozoic-Cenozoic terrestrial clastic deposits are well-developed and widely distributed, specially the Jurassic deposits. The Jurassic strata, except the Upper Jurassic series being red rocks, are mainly composed by dark rocks. These dark rocks, including gray, black mudstones, shales, carbonaceous mudstones and coal beds are of stronger hydrocarbon-generating capability. To general analysis of various materials including deposits, plant and pollen fossils, etc., shows that during the Early-Middle Jurassic the Tianshan region was a feature of lower mountains-hills on geography and was a humid climatic environment. The palaeoenvironment is an advantage to coal accumulation and deposits of dark mudstone.
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