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Distribution of Nanhua-Sinian rifts and proto-type basin evolution in southwestern Tarim Basin, NW China
Petroleum Exploration and Development ( IF 7.5 ) Pub Date : 2020-12-22 , DOI: 10.1016/s1876-3804(20)60130-1
Lei TIAN , Huquan ZHANG , Jun LIU , Nianchun ZHANG , Xiaoqian SHI

Based on seismic data, outcrop evidence, logging data and regional aeromagnetic data, the distribution of Nanhua–Sinian rifts in the southwestern Tarim Basin was analyzed, and on the basis of restoration of lithofacies paleogeography in different periods of Neoproterozoic–Cambrian, the evolution model of the proto-type rift basin was discussed. The Neoproterozoic Rodinia supercontinent split event formed the trigeminal rift system at the edge and inside of the craton in the southwestern Tarim Basin located in the Kunlun piedmont and Maigaiti slope. The rift in Kunlun piedmont zone was distributed along the E-W direction and was the oceanic rift in the trigeminal rift system. Two decadent rifts in N-E strike developed in the Luonan and Yubei areas of Maigaiti slope, and the interior of the rifts were characterized by a composite graben-horst structure composed of multiple grabens and horsts. The Neoproterozoic–Cambrian proto-type basin evolution in the southwestern Tarim Basin can be divided into three stages: rift in the Nanhua, embryonic passive continental margin in the Sinian, and stable passive continental margin in the Cambrian. Despite the regional tectonic movements in the end of Nanhua and Sinian, the tectonic framework of the southwestern Tarim Basin had not changed significantly, the sedimentary center of Nanhua rift basin showed the characteristics of succession in the Sinian–Early Cambrian. The Nanhua rift in Kunlun piedmont evolved into a craton marginal depression during the Sinian–Early Paleozoic, while the Luonan decadent rift in the midsection of Maigaiti slope evolved into a sag inside platform in Early Cambrian, constituting the paleogeographic framework of “two paleouplifts and one sag” with the paleouplifts in east and west sides of the slope. The later evolution of the Luonan decadent rift in the midsection of the Maigaiti slope formed two sets of reservoir-forming assemblages, the Sinian and the Lower Cambrian ones, which are important exploration targets in future.



中文翻译:

塔里木盆地西南部南华-震旦纪裂谷分布及原型盆地演化

根据地震数据,露头证据,测井数据和区域航空磁数据,分析了塔里木盆地西南部南华-震旦裂谷的分布,并在恢复新元古代-寒武纪不同时期岩相古地理的基础上,建立了演化模型讨论了原始裂谷盆地的构造。新元古代罗迪尼亚超大陆分裂事件在西南昆仑山前和麦盖提斜坡的塔里木盆地西南部克拉通边缘和内部形成了三叉裂谷系统。昆仑山前地带的裂谷沿EW方向分布,是三叉系裂谷系统中的大洋裂谷。在迈盖蒂坡的洛南和渝北地区,东北地区发生了两次decade裂。裂谷的内部特征是由多个grab和组成的复合grab-hor结构。塔里木盆地西南部的新元古代—寒武纪原型盆地演化可分为三个阶段:南华裂谷,震旦纪新生被动大陆边缘和寒武纪稳定被动大陆边缘。尽管南华和震旦纪末期发生了区域性构造运动,但塔里木盆地西南部的构造框架并未发生明显变化,南华裂陷盆地的沉积中心表现出震旦纪-早寒武世的演替特征。震旦—早古生代,昆仑山前的南华裂谷演化为克拉通边缘洼地,麦盖提斜坡中段的洛南decade陷裂谷演化为寒武纪早期台地内部的凹陷,构成了“两个古隆起和一个凹陷”的古地理框架,其东,西两侧为古隆起。麦盖提斜坡中段洛南decade陷裂谷的后期演化形成了两组油气成藏组合,震旦系和下寒武统,这是未来的重要勘探目标。

更新日期:2020-12-22
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