DISCOVERY OF INCISED VALLEY AND ITS PETROLEUM GEOLOGICAL SIGNIFICANCE AT CHEPAIZI AREA OF THE JUNGGAR BASIN
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摘要: 下切谷具有重要的油气地质意义。对准噶尔盆地车排子地区下白垩统吐谷鲁群中下切谷的发现及系统研究表明,以车排子凸起为界,可将下切谷分为东缘和南缘两大体系,隆后斜坡带是大型下切谷体系发育的主要部位,下切谷体系在发育过程中经历了多期垂向切割和侧向侵蚀以及随后的充填堆积和侧向加积作用,具有独特的沉积构成特征和充填特征。下切谷由白垩纪早期准噶尔盆地南缘强烈的构造幕式挤压冲断作用导致的湖平面快速下降形成。目前,该下切谷体系已成为车排子地区的主要油气勘探领域。Abstract: Incised valleys have important petroleum geological significance.Discovery and systematic research of incised valleys in Tugulu Group of Lower Cretaceous at Chepaizi area of the Junggar Basin have shown that,the incised valley system can be divided into the eastern margin system and the southern margin system by the Chepaizi Uplift.The back bulge slope belt in large compressional basins is the major area where large incised valleys are formed.Multi-stages of erosion both vertically and laterally,and the following filling accumulation and lateral aggradation result in peculiar sedimental structure and filling characteristics of incised valley system.Rapid fall of lake level caused by strong episodic tectonic compression and thrusting in the southern margin of Junggar Basin during early Cretaceous leads to inside valleys.At present,the incised valley system is the main hydrocarbon exploration target in Chepaizi area.
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