Geological Conditions on Forming Oil-gas Field from Jurassic Coals in Tuha Basin

Zhao Changyi; Zhao Wenzhi; Cheng Keming; Niu Jiayu; Zhang Yan; Li Wei

The Tuha basin is a typical coal-derived oil-gas basin. Through analyzing the geological and geochemical conditions formingcoal-derived oil in this basin, the coal-derived oil pool is rnnsidered to be formed under a specially designated geological condition.(1) The development of source rocks and reservoir of coal measures is controlled by the tectonic evolution of basin. (2) Low-ma-lure source materials are favorable for the expulsion of h州rocarbons. ( 3 ) Redox environments of coal-forming swamp and coal-forming plants result in the difference of hydrogen-rich degree in coal. Lower delta plain and interdistributary bay swamps are fa-vorable for the development of coal-derived hydrocarbon, and running water swamp facies is the most favorable facies zone for hy-drocarbon generation from coal. (4) Appropriate paleogeothermal gradient and inherited development of basin is advantageous tomaturation of source rock, and the development of overlying lake deposit is beneficial to the preservation of the expulsive hydrocar-boas from coalbed. (5) Suitable tectonic compressing is favorable for the expulsion and migration of coal-derived oil.

Research Institute of Petroleum Exploration and Development,CNPC,Beijing 100083

Received Date: 1996-12-30

Publish Date: 1997-12-31

Key words:

Abstract: The Tuha basin is a typical coal-derived oil-gas basin. Through analyzing the geological and geochemical conditions formingcoal-derived oil in this basin, the coal-derived oil pool is rnnsidered to be formed under a specially designated geological condition.(1) The development of source rocks and reservoir of coal measures is controlled by the tectonic evolution of basin. (2) Low-ma-lure source materials are favorable for the expulsion of h州rocarbons. ( 3 ) Redox environments of coal-forming swamp and coal-forming plants result in the difference of hydrogen-rich degree in coal. Lower delta plain and interdistributary bay swamps are fa-vorable for the development of coal-derived hydrocarbon, and running water swamp facies is the most favorable facies zone for hy-drocarbon generation from coal. (4) Appropriate paleogeothermal gradient and inherited development of basin is advantageous tomaturation of source rock, and the development of overlying lake deposit is beneficial to the preservation of the expulsive hydrocar-boas from coalbed. (5) Suitable tectonic compressing is favorable for the expulsion and migration of coal-derived oil.

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Reference (13)

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Geological Conditions on Forming Oil-gas Field from Jurassic Coals in Tuha Basin

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