Petroleum Science >2013,??Issue 3:??269-281 DOI: https://doi.org/10.1007/s12182-013-0276-3
Tectonic evolution and its control over deposition infault basins: A case study of the Western Sag of theCenozoic Liaohe Depression, eastern China Open?Access
文章信息
Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China 2 Key Laboratory of Saline Lake Resources and Environments, Ministry of Land and Resources, Beijing 100037, China;3 College of Geosciences, China University of Petroleum, Beijing 102249, China 4 State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China;3 College of Geosciences, China University of Petroleum, Beijing 102249, China 4 State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China;5 PetroChina Dagang Company, Tianjin 300280, China;6 Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
文章摘要
experienced two-stage tectonic evolution, i.e., rifting subsidence in the Paleogene and post-rifting thermal
subsidence in the Neogene-Quaternary. The episodic tectonic evolution and syndepositional faulting had
significant influence on the fault basins in terms of accommodation space, deposition rate, and depositional
facies zones. In this study, the tectonic deformation characteristics and the tectonic-depositional evolution
of the Western Sag of the Cenozoic Liaohe Depression were investigated by comprehensive analysis
of the available geological and geophysical data using the modern theory of tectonic geology and the
balanced section technique. The tectonic deformation of the Cenozoic fault basin was characterized by
superimposed faults and depression. In addition, there existed relatively independent but still related
extensional tectonic systems and strike-slip tectonic systems. The tectonic evolution of the fault basin
involved five stages, i.e., initial rifting stage (E2s4), intense faulting stage (E2s3), fault-depression
transition stage (E3s1-2), differential uplifting stage (E3d), and depression stage (N-Q). According to the
characteristics of tectonic development and evolution of the Western Sag, the depositional evolution in
the Cenozoic fault basin was divided into two stages, i.e., multi-episodic rifting filling in the Paleogene
and post-rifting filling in the Neogene-Quaternary. The former rifting stage was further subdivided into
four episodes with different characteristics of depositional development. The episodic faulting controlled
the filling process and filling pattern of the Cenozoic Western Sag as well as the development and spatial
distribution of associated depositional systems, whereas the syndepositional faults that developed in
multiple stages in various tectonic positions controlled the development of depositional systems and sand
bodies in the Western Sag. That is, the fault terraces on steep slopes controlled the development of sand
bodies, the fault terraces on gentle slopes controlled the development of low-stand fan bodies, and the
fault terraces or fault troughs in the central basin controlled the development of fluxoturbidite bodies.
关键词
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Fault basin, syndepositional fault, tectonic evolution, depositional evolution, Western Sag