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Source rock condition and the formation of Jurassic lowmaturitygases in the eastern Junggar Basin

Zhang Mingfeng,Xiong Deming,Wu Chenjun,Ma Wanyun,Sun Lina,Tuo Jincai   

  1. (1.Key Laboratory of Petroleum Resources,Gansu Province/Key Laboratory of Petroleum Resources Research,
    Institute of Geology and Geophysics,Chinese Academy of Sciences,Lanzhou 730000,China;
    2.University of Chinese Academy of Sciences,Beijing 100049,China;3.Research Institute of Experiment
    and Detection,Xijiang Oilfield Company,Karamay 834000,China)
  • Received:2015-06-12 Revised:2015-07-24 Online:2016-02-10 Published:2016-02-10

Abstract:

Source rock condition is an important factor in the formation of lowmature gas.The Jurassic source rocks are widely distributed with large thickness in the eastern Junggar Basin.The organic matter type is Ⅲ,and its maturity is less than 1.0%.Geochemical analysis showed that RO(%) changes slightly,basically between 0.5% and 0.8% from 2 200m to 4 500m.The RO(%) variation is small with the increase of the depth of source rocks,indicating that it has not reached the gas generation peak,and this evolutionary stage holds a long geological history of time.To obtain information about the influences of heating time and temperature during the evolution of sedimentary organic matter,with hydrous pyrolysis,twenty experiments were conducted at different temperatures and heating time.The results showed that alkane gas production is low and change little with increasing pyrolysis time (330days) at 330℃ and 350℃.With the increase of  simulation temperature (370℃ and 390℃),the alkane gas production reaches the peak at 1421 days,and after that to the day 30 it showed a slow increase or nearly unchanged,relative to the same temperature for 3 days,the gas production increased 23 times,i.e.,RO increased by 0.2%0.3%.The amount of hydrocarbons gas increased significantly.That means,the effect of time on the evolution of lowmature gas may be related to the maturity.

Key words: Eastern Junggar Basin, Source rock of Jurassic, Hydrous pyrolysis experiments, Pyrolysis time and temperature, Lowmaturity gases formation

CLC Number: 

  • TE122.1

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