塔里木盆地沙雅隆起与柯坪露头中上奥陶统地层对比及烃源岩分布

发布时间：2018-04-16 22:13

本文选题：萨尔干组 + 中上奥陶统　；参考：《石油实验地质》2016年02期

【摘要】：柯坪露头奥陶系地层是塔里木盆地大型碳酸盐岩台地的西延部分,两者经历了相同的沉积演化过程。以古生物资料为基础,通过碳同位素地层对比,认为沙雅隆起中奥陶统一间房组发育的中达瑞威尔阶碳同位素正漂移(MDICE)和上奥陶统良里塔格组内发育的凯迪阶早期古登伯格碳同位素正漂移(GICE),分别对应于柯坪露头萨尔干组下部和其浪组中下部的正漂移,推测其浪组上部存在加里东中期Ⅱ幕构造运动的不整合面,不整合面之上的其浪组和印干组地层对应于沙雅隆起上奥陶统桑塔木组。受早—中奥陶世全球海平面上升的影响,塔里木盆地北部中下奥陶统台地东侧表现为陡坡,台地厚度向西北逐渐减薄,沙雅隆起西北地区和阿瓦提—柯坪北部地区属于斜坡—盆地沉积体系。萨尔干组海相烃源岩主要由达瑞威尔阶中晚期凝缩段沉积构成,结合露头和沙雅隆起钻井电性特征,认为该套烃源岩在阿瓦提和沙雅隆起西北地区也有分布。良里塔格组沉积时期,柯坪、塔中和沙雅隆起小型碳酸盐岩台地之间的凹陷是GICE对应的良里塔格组烃源岩有利发育地区。印干组烃源岩分布范围最广,在阿瓦提和沙雅隆起均有分布。
[Abstract]:The Ordovician strata in Keping outcrop are part of the western extension of large carbonate platform in Tarim Basin, and they have undergone the same sedimentary evolution process.Based on paleontological data, carbon isotopic stratigraphic correlation,It is considered that the positive drift of carbon isotopes of the Middle Daraville order developed in the Middle Ordovician Intermediate formation in the Shaya uplift and in the Litagar formation of the Upper Ordovician Tagger formation, and the positive drift of the early Cedenberger carbon isotopes in the upper Ordovician formation correspond to those of Kopinglu, respectively.The positive drift of the lower part of the Tosargan formation and the middle and lower part of its wave formation,It is inferred that there is an unconformable surface in the middle Caledonian second act tectonic movement in the upper part of the Qilang formation, and the strata of the Qilang formation and the Ingan formation above the unconformable surface correspond to the Upper Ordovician Santamu formation in the Shaya uplift.Influenced by the rise of global sea level in the Early-Middle Ordovician, the eastern side of the Meso-Lower Ordovician platform in the northern part of the Tarim Basin shows a steep slope, and the thickness of the platform gradually decreases to the northwest.The northwest area of Shaya uplift and the northern Awati-Keping area belong to the slope-basin sedimentary system.The marine source rocks of the Sargan formation are mainly composed of the late condensed member deposits of the Darivier stage. Combined with the electrical characteristics of outcrop and Shaya uplift, it is considered that the source rocks are also distributed in the northwest area of Awati and Shaya uplift.The depression between the small carbonate platform of Keping, Tazhong and Shaya uplift in the sedimentary period of Lianglitag formation is the favorable area for the source rocks of the Lianglitag formation corresponding to GICE.The source rocks of the Ingan formation are most widely distributed, both in Awati and Shaya uplift.
【作者单位】：成都理工大学油气藏地质及开发工程国家重点实验室;中国石化西北油田分公司勘探开发研究院;
【基金】：国家科技重大专项(2011ZX05005-004,2016ZX05005-002) 国家重点基础研究发展计划(973计划)项目(2012CB214806)资助
【分类号】：P618.13

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