库车东部下侏罗统沉积特征研究

Study on Characteristics of Lower Jurassic Sedimentation in Eastern Kuqa

主要根据大量野外露头资料、岩芯资料及测井解释成果,结合岩石薄片、重矿物及阴极发光等分析测试资料,对库车坳陷东部下侏罗统阿合组及阳霞组物源和沉积相进行了详细研究,结果表明:库车坳陷东部下侏罗统阿合组及阳霞组物源主要来自北部南天山构造带,以岩浆岩和变质岩母岩区为主,仅有少量沉积岩母岩供给,阿合组比阳霞组具有更高的砂、泥质量比。库车坳陷东部地区阿合组及阳霞组沉积相的分布特征决定了研究区北部为油气勘探的有利区域。

Based on a large number of field outcrop data, core data and logging interpretation results, combined with rock thin section, heavy minerals and cathodoluminescence analysis and test data, the provenance and sedimentary facies of lower Jurassic ahe formation and Yangxia formation in the east of Kuqa depression are studied in detail. The results show that the provenance of lower Jurassic ahe formation and Yangxia formation in the east of Kuqa depression mainly comes from the southern Tianshan structural belt in the north, mainly from the parent rock area of magmatic rocks and metamorphic rocks. Only a small amount of sedimentary parent rock is supplied, and the ahe formation has a higher sand/mud ratio than the Yangxia formation. The distribution characteristics of sedimentary facies of ahe formation and Yangxia formation in the eastern part of Kuqa depression determine that the northern part of the study area is a favorable area for oil and gas exploration.