Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (5): 84-92.doi: 10.12108/yxyqc.20200509

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Formation mechanism and distribution prediction of hydrogen sulfide in Yingxiongling area,Qaidam Basin

TIAN Jixian1, ZHAO Jian2, ZHANG Jing2, KONG Hua1, FANG Yongsheng3, ZENG Xu1, SHA Wei2, WANG Mu2   

  1. 1. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;
    2. Research Institute of Exploration and Development, PetroChina Qinghai Oilfield Company, Dunhuang 736202, Gansu, China;
    3. Department of Exploration, PetroChina Qinghai Oilfield Company, Dunhuang 736202, Gansu, China
  • Received:2019-10-31 Revised:2020-03-02 Online:2020-10-01 Published:2020-08-08

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Abstract: In recent years,gas reservoirs containing high hydrogen sulfide have been found in lacustrine carbonate rocks in the upper member of the lower Ganchaigou Formation(E32)in Yingxiongling area of Qaidam Basin. In order to clarify the genetic mechanism of hydrogen sulfide and predict its distribution effectively,the geochemical characteristic analysis of natural gas and simulated experiment were carried out. The results show that:(1)Hydrogen sulfide is a product of thermochemical sulphate reduction(TSR)in the central of Yingxiongling area,and the higher the temperature,the greater the production. The development of source rocks,the widely distributed salt-rock formation,the high geothermal gradient and the large number of developed pore reservoirs provide favorable conditions for the formation of hydrogen sulfide gas reservoirs.(2)Under the influence of the overall uplift of the Late Himalayan movement,the maximum paleogeothermal temperature experienced by the present strata in historical accumulation period is higher.(3)During E32 deposition period,the rock salt developed in the center of the lake basin,and the oil and gas sealing conditions are good. The development of the pre-salt pore reservoirs is conducive to the enrichment of hydrogen sulfide. It was comprehensively predicted that the pre-salt strata in the central of Yingxiongling-Ganchaigou area are hydrogen sulfide enrichment areas. The research results are of great significance for the exploration,deployment and production safety of hydrogen sulfide gas reservoir.

Key words: hydrogen sulfide, thermochemical sulphate reduction, lacustrine carbonate, salinized lake, Yingxiongling area, Qaidam Basin

CLC Number: 

  • TE122.1
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