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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2018  >  40(3): 389-396
XU Jianbing, LIANG Yungan, DENG Qian, CHENG Bin, LIAO Zewen. Degradation characteristics of propane in shale rocks and its implication to shale gas composition[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2018, 40(3): 389-396. doi: 10.11781/sysydz201803389
Citation: XU Jianbing, LIANG Yungan, DENG Qian, CHENG Bin, LIAO Zewen. Degradation characteristics of propane in shale rocks and its implication to shale gas composition[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2018, 40(3): 389-396. doi: 10.11781/sysydz201803389
shu

Degradation characteristics of propane in shale rocks and its implication to shale gas composition

doi: 10.11781/sysydz201803389
  • 1.

    State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, Guangdong 510640, China

  • 2. University of the Chinese Academy of Sciences, Beijing 100049, China

  • Received Date: 2017-09-06
  • Rev Recd Date: 2018-04-17
  • Publish Date: 2018-05-28
    Abstract
  • Propane and shale samples taken from the same well and different depths in the Longmaxi Formation in the Sichuan Basin were selected to carry out different series of simulation experiments in order to investigate the influence of the degradation of small molecular hydrocarbons on the composition of shale gas in the shale during the over-mature stage. The constant temperature thermal simulation experiments of a gold tube-restricted system were carried out on C3H8, C3H8 + shale, C3H8 + shale + water at 360℃ and 50 MPa for 72, 216, 360, 720 h. Other pyrolysis experiments were performed using C3H8 and C3H8 + shale samples at 400, 450, 500 and 550℃ with a pressure of 50 MPa for 72 h in order to increase the degradation degree of C3H8. The results showed that the CH4, C2H6 yields and the CH4/C2H6 ratio of C3H8 + shale at 360℃ are higher than those of C3H8 alone. The experiments with S1 shale rock which contains more clay minerals generated more CH4 and C2H6 than those with S2 rock sample, and generally showed higher CH4/C2H6 ratios. After increasing the simulation temperature, the conversion of C3H8 was significantly increased. The yields of CH4 and C2H6 in the C3H8 + shale experiment were all higher than those in the control experiment, and the yield of CH4 was higher than that of C2H6. These results indicated that clay minerals can catalyze C3H8 degradation and produce more CH4. The yields of CH4 and C2H6, and the CH4/C2H6 ratio from the hydrous experiments were higher than those from anhydrous experiments, which indicated that water can promote the cracking of C3H8 to produce more CH4. The positive effect of clay mineral and water in shale on C3H8 cracking increased the dryness index of shale gas. The degradation of small hydrocarbon molecules had an important influence on the composition of shale gas particularly in high-to over-mature shale rocks. It seems that water played a significant role and its effect on the evaluation of shale gas reserve should be thoroughly investigated especially for high-to over-mature shale rocks.

     

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