Journal of Jilin University(Earth Science Edition) ›› 2019, Vol. 49 ›› Issue (6): 1518-1528.doi: 10.13278/j.cnki.jjuese.20180243

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Filling Characteristics and Research Significance of Permian in Tainan Depression of Tuha Basin

Li Rubin   

  1. Exploration and Development Research Institute of Daqing Oilfield Co Ltd., Daqing 163712, Heilongjiang, China
  • Received:2018-09-18 Published:2019-11-30
  • Supported by:
    Supported by National Natural Science Foundation of China (41430322)

Abstract: Taking high resolution sequence stratigraphy as a guidance, combined with episodic tectonic evolution characteristics of Tainan depression, the author analyzed the Permian stratigraphic sequences of Tainan depression by using core observation, oil test data, geophysical and geochemical data. The studies show that the filling characteristics of stratigraphic sequences, source rocks and reservoir distribution are controlled by tectonic evolution with significant stages. The lithology stacking patterns and sedimentary distribution are controlled by the structural characteristics:during the LSC1 deposition period, the southern Sleep Tarot Mountains rose, the northern steep slope developed fan delta and underwater fan deposits, and the southern gentle slope developed braided river delta sedimentary system; during the LSC2 deposition period, the western Luxi uplift and eastern Takequan uplift gradually formed, and the provenance decreased in the south, but increased in the east and west; during the LSC3 deposition period, the northern Bogda Mountains rose, the strata tilted from north to south, the provenance gradually developed in the north, the fan delta developed on the short axis of the fault depression, and the fan delta sedimentary system-braided river delta sedimentary system-lacustrine depositional system transited gradually on the long axis of the fault depression. Through the analysis of the sequence stratigraphy of source rocks and reservoirs, the author believes that the mudstones developed in the late stage of LSC2 transgressive system tract and early stage of high system tract are the main hydrocarbon rocks, and the sandstones developed in the upper LSC3 low water level system tract are the main reservoirs of oil and gas.

Key words: Tainan depression, Permian, high-resolution sequence stratigraphy, systems tract, sedimentary facies, source rock, Tuha basin

CLC Number: 

  • P618.13
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