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DOI:10.1306/01242418082
The evolution of the early Paleozoic carbonate platform in the Central uplift, Tarim Basin, northwestern China, and hydrocarbon accumulation
Huabiao Qiu12 , Wei Lin2 , Shang Deng13 , Huixi Lin1 , Zhongpei Zhang1 , Zicheng Cao3 , Cheng Huang3 , and Jun Han3
1 Petroleum Exploration and Production Research Institute, Sinopec, Beijing 100083, China
2 State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
3 Exploration and Development Research Institute, Sinopec Northwest Oilfield Company, Urumqi 830011, China
Ahead of Print Abstract
The Tarim Basin is the largest superimposed and oil-bearing basin in China, presented as an episodic tectonic superposition in the Central uplift. Understanding hydrocarbon differential accumulation in the Central uplift requires a proper view of the evolution of the early Paleozoic carbonate platform. Through detailed 2-D seismic interpretation, paleogeography and paleotectonic reconstructions of the carbonate platform are performed. Tying hydrocarbon accumulation elements to dynamic evolutionary process of the carbonate platform, this paper provides new insights into hydrocarbon differential accumulation in the Tazhong and Bachu uplifts. Due to ongoing compression from the south, the Hetian paleohigh and the Tazhong uplift initially formed in the Cambrian–Middle Ordovician carbonate platform interior in the latest Middle Ordovician. The climax of uplifting and northward tilting of preexisting paleohighs occurred in the latest Ordovician and latest Middle Devonian, respectively. The carbonate platform suffered polyphase exposures in these paleohighs and strike-slip faulting in the northern slope of the Tazhong uplift, forming favorable karst reservoirs and strike-slip fault-controlled reservoirs. Following the latest Permian uplifting of the northwestern Hetian paleohigh, the Bachu uplift nucleated in the northern Hetian paleohigh in the Cenozoic. The southwestern Hetian paleohigh was inverted into a southwest-dipping monocline. In the Bachu uplift, the allochthonous hydrocarbons from the southwestern Hetian paleohigh underwent episodic migration, accumulation, adjustment, and destruction during the evolution of these uninherited paleohighs. The hydrocarbons mainly remain in structural-stratigraphic traps in the southern margin of the Bachu uplift. Only multiple periods of gentle tilting has occurred in the Tazhong uplift since the Late Devonian. Episodic migrating hydrocarbons from autochthonous and neighboring source rocks in the north are enriched in the northern flank of the inherited Tazhong uplift.
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