塔里木新元古代裂谷盆地南北分异及油气勘探启示

发布时间：2018-02-10 13:34

本文关键词： 新元古代裂谷南北分异下寒武统塔里木盆地烃源岩　出处：《石油学报》2017年03期 　论文类型：期刊论文

【摘要】：综合航磁、地震、地质和地球化学资料,研究了塔里木新元古代裂谷盆地南北分异的表层构造、沉积、分布特征及深层动力学机制,揭示了裂谷盆地演化及其对寒武纪早期沉积盆地和深层烃源岩分布的控制作用。塔里木南部裂谷盆地是罗迪尼亚超大陆裂解早期超级地幔柱活动的产物,开启于南华纪早期(约780 Ma),表现为深入塔里木盆地内部的NE向坳拉槽,而北部裂谷是泛罗迪尼亚大洋板块俯冲产生的弧后裂谷盆地,开启于南华纪后期(约740 Ma),呈近EW向狭长带状横穿整个塔里木盆地。塔里木北部新元古代弧后裂谷盆地与东亚地区晚中生代—新生代弧后裂谷盆地群的形成和演化过程十分相似,均显示向洋迁移的演化特征,但塔里木裂谷盆地从早期的断陷-拗陷最终演化成被动陆缘。塔里木新元古代裂谷盆地不仅决定同裂谷期烃源岩的分布,更控制早寒武世沉积盆地的发育,使得后者"向前相似",在现今塔北隆起与中央隆起带之间很可能发育近EW向展布的南华系—震旦系同裂谷期和下寒武统玉尔吐斯组沉积期后裂谷期烃源岩。
[Abstract]:Combined with aeromagnetic, seismic, geological and geochemical data, the surface structure, deposition, distribution characteristics and deep dynamic mechanism of the north-south differentiation of the Neoproterozoic rift basin in Tarim were studied. It is revealed that the evolution of rift basin and its control on the distribution of early Cambrian sedimentary basins and deep hydrocarbon source rocks. The southern Tarim rift basin is the product of the supermantle plume activity in the early stage of the division of the Rodinian supercontinent. It was opened in the early South China (about 780 Mai), which is represented by the NE trench deep inside the Tarim basin, while the northern rift is a back-arc rift basin caused by the subduction of the pan-Rhodinia oceanic plate. It was opened in the late South China (about 740 Ma), with a narrow and narrow band near EW across the whole Tarim basin. Formation and formation of Neoproterozoic Rear Arc Rift Basin in Northern Tarim and late Mesozoic to Cenozoic Back-Arc Rift Basin Group in East Asia. The process is very similar. But the Tarim rift basin evolved from the early fault-depression to the passive continental margin. The Tarim Neoproterozoic rift basin not only determined the distribution of the source rocks in the same rift period, but also developed into a passive continental margin. Controlling the development of early Cambrian sedimentary basins, This makes the latter "forward similar", and the source rocks of the South China and Sinian synrift periods and the lower Cambrian Yultui formation depositional period are likely to be developed between the present Tarim uplift and the central uplift belt in the near EW-trending direction of the South China system and the post-rift period of the Lower Cambrian Yultuisi formation.
【作者单位】：中国石油勘探开发研究院;
【基金】：中国石油天然气股份有限公司“油气勘探新领域、新理论、新方法、新技术研究”项目(2014A-02) 中国博士后科学基金项目(2015M581129)资助
【分类号】：P618.13

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