【摘要】 前人对塔里木盆地于奇地区三叠系—侏罗系地层沉积相类型的认识存在较大分歧。在野外剖面观测及钻井岩心观察的基础上,结合岩石颜色、沉积构造、剖面结构、测井相和地震响应等沉积相识别标志认为,该区三叠系—侏罗系地层发育湿地扇三角洲—湖泊沉积体系。对该体系进一步作时空演化系统分析,结果表明:于奇地区三叠纪—侏罗纪古气候湿润,物源主要来自沙雅隆起剥蚀区南缘;三叠系—侏罗系地层可识别出湿地扇三角洲和湖泊沉积相;由于印支运动构造抬升,导致该区缺失三叠系上统地层的顶部、侏罗系中统和上统地层,仅侏罗系下统地层发育湿地扇三角洲平原相。通过此研究,可以更好地了解于奇地区三叠纪—侏罗纪地层的沉积环境,为该区下一步油气勘探提供基础地质资料。更多还原

【Abstract】 Based on detailed field outcrop profiles and the core drilling observation,combining with the rock color,sedimentary structures,profile structures,log facies and seismic response,the sedimentary facies of Triassic-Jurassic formation in Yuqi area of Tarim Basin was analyzed,which is wet fan delta-lacustrine sedimentary system.The time and space evolution analysis result shows that during Triassic to Jurassic,the climate is humid,and the main sources come from the southern margin of Shaya uplift.There are two set of complete depositional cycles in Triassic formation,which are wet fan delta and lake.And due to the tectonic uplift of Indosinian movement,the top of Triassic formation and the Upper-Middle Jurassic formation are absent.Wet fan delta plain is developed in the Lower Jurassic formation.The research results are useful to understand the depositional environment during the period of Triassic to Jurassic,and can provide basic geologic data for oil and gas exploration in this area.更多还原