Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (4): 116-127.doi: 10.12108/yxyqc.20220411

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Hydrocarbon generation kinetics of source rocks of Permian Fengcheng Formation in Mahu Sag,Junggar Basin

BAI Yu1, WANG Fei1, NIU Zhijie1, JIN Kailai2, LI Peiyi2, XU Duonian3, CHEN Gangqiang2   

  1. 1. Research Institute of Exploration and Development, PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China;
    2. Faculty of Petroleum, China University of Petroleum-Beijing at Karamay, Karamay 834000, Xinjiang, China;
    3. PetroChina Research Institute of Petroleum Exploration & Development-Northwest, Lanzhou 730020, China
  • Received:2021-11-05 Revised:2021-12-04 Online:2022-07-01 Published:2022-07-07

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Abstract: The total proven reserves in Mahu Sag and its surrounding areas in Junggar Basin are nearly 30×108 t, and the oil mainly comes from the alkali lacustrine source rocks of Permian Fengcheng Formation in the sag. Based on thermal simulation data of gold tube experiment,combined with the calculation with Kinetic software, various hydrocarbon yields and kinetic parameters of the source rocks of Permian Fengcheng Formation in Mahu Sag were obtained,the hydrocarbon generation model was established,and then the hydrocarbon generation capacity of this set of source rocks was evaluated. The results show that:(1)The total hydrocarbon yield of alkali lacustrine source rocks of Fengcheng Formation in Mahu Sag is as high as 412.24 mg/(g·TOC),in which the liquid hydrocarbon yield first increases and then decreases with the increase of temperature,the peak temperature is between 420℃ and 460℃,the gaseous hydrocarbon yield continues to increase,the total oil production rate is higher than the gas production rate, and the carbon isotope of gaseous hydrocarbon has the characteristics of oil-formed gas.(2)The peaks of activation energy of C1, C2-C5, C6-C14 and C14+ of the source rocks of Fengcheng Formation are 268 kJ/mol, 255 kJ/mol, 251 kJ/mol and 247 kJ/mol respectively.(3)The hydrocarbon generation model of alkali lacustrine source rocks of Fengcheng Formation in Mahu Sag is similar to that of source rocks in 14 different basins at home and abroad. It has the characteristics of early oil generation peak and late continuous gas generation, and per unit TOC has upper-middle hydrocarbon generation capacity.

Key words: hydrocarbon generation kinetics, source rocks, gold tube thermal simulation, oil-formed gas, Fengcheng Formation, Permian, Mahu Sag, Junggar Basin

CLC Number: 

  • TE122.2
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