The north-south differentiation characteristic and its enlightenment on oil-gas exploration of the Neoproterozoic rift basin, Tarim Basin

被引：0
|
作者：
Ren R. [1 ]
Guan S. [1 ]
Wu L. [1 ]
Zhu G. [1 ]
机构：
[1] PetroChina Research Institute of Petroleum Exploration & Development, Beijing
来源：
Guan, Shuwei (guan@petrochina.com.cn) | 1600年 / Science Press卷 / 38期
关键词：
Hydrocarbon source rocks; Lower Cambrian; Neoproterozoic; North-south differentiation; Rift; Tarim Basin;
D O I：
10.7623/syxb201703002
中图分类号：
学科分类号：
摘要：
Comprehensively based on the aeromagnetic, seismic, geological and geochemical data, this paper studies the surficial structures, deposition, distribution characteristics and the deep-seated dynamical mechanism for the north-south differentiation of Neoproterozoic rift basin of Tarim Basin, and reveals the evolutionary characteristics of the rift basin and its controlling effect on the distribution of the early Cambrian sedimentary basin and the deep hydrocarbon source rocks. The southern rift basin of Tarim is the product of superplume activity occurred in the early break-up period of Rodinia Supercontinent, starting from the early Nanhua period (about 780 Ma)and shown as the NE-trending aulacogens that extended deeply inside of Tarim basin. The northern rift belongs to the back-arc rift basin derived from the subduction of Pan-Rodinia oceanic slab, starting from the late Nanhua period (about 740 Ma)and shown as the nearly EW-trending narrow band zone traversing the whole Tarim basin. The formation and evolution process of the Neoproterozoic back-arc rift basin, northern Tarim is quite similar to that of the late Mesozoic-Cenozoic back-arc rift basins in East Asia, both showing the evolutionary characteristics of oceanward migration. Nevertheless, the Tarim rift basin was finally evolved from the early fault depression-sag into the passive continental margin. The Neoproterozoic rift basin of Tarim controlled not only the distribution of syn-rifting hydrocarbon source rocks, but also the development of early Cambrian sedimentary basin, which made the latter similar to the rift basin. Thus, hydrocarbon source rocks in the nearly EW-trending Nanhua-Sinian syn-rift period and the post-rifting period of Lower Cambrian Yuertusi Formation are likely developed between the north Tarim uplift and the central uplift belt. © 2017, Editorial Office of ACTA PETROLEI SINICA. All right reserved.
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页码：255 / 266
页数：11
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