摘要
准噶尔盆地是一个大型内陆断陷盆地,沉积岩面积约13万平方公里,最大厚度为13000米。克拉玛依油田的发现,说明盆地西北缘有石炭、二叠、三叠及侏罗系等多层系的含油组合。还证实中新生界之下,有巨厚而完整的二叠系及局部轻微变质的中上石炭统。这些基本上为碎屑岩的上古生界,可能是盆内最老的也是最好的生油岩系。
Abstract
Junggar is a huge faulted basin and is covered by sedimentary rocks constituting about 130000km.The Middle and Upper Carboniferous,the Permian,and the complete Meso-Cenozoic sediments are developed on the Variscian folded basement.The Middle and Upper Carboniferous are marine,transitional and continental deposits.The Permian belong to continental deposits.Both of them are multi-depocenter clastic rocks with abundant organic matters.According to the main geochmical indexes of petroleum generation,they should be the main source rocks in this basin.During Meso-Cenozoic,the southern part of the basin developed into deep depression,while the northern part gradually became a southtilting slope.So it is most favorable to the Permo-Carboniferous hydrocarbons to migrate and accumulate toward the northern marginal zone,in which the prospecting for oil would be more effective.
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