ZHANG Xuejuan, RONG Pengfei, LU Shuangfang, ZHANG Xi, GUO Tianran, WANG Min. Physical simulation of volumetric charging of volcanic rock: case study of volcanic rock in Yingcheng Formation of Xujiaweizi Fault Depression in Songliao Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2018, 40(6): 864-870. doi: 10.11781/sysydz201806864
Citation: ZHANG Xuejuan, RONG Pengfei, LU Shuangfang, ZHANG Xi, GUO Tianran, WANG Min. Physical simulation of volumetric charging of volcanic rock: case study of volcanic rock in Yingcheng Formation of Xujiaweizi Fault Depression in Songliao Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2018, 40(6): 864-870. doi: 10.11781/sysydz201806864

Physical simulation of volumetric charging of volcanic rock: case study of volcanic rock in Yingcheng Formation of Xujiaweizi Fault Depression in Songliao Basin

doi: 10.11781/sysydz201806864
  • Received Date: 2018-09-09
  • Rev Recd Date: 2018-10-23
  • Publish Date: 2018-11-28
  • Full-diameter volcanic rock core samples of the Yingcheng Formation in the Xujiaweizi Fault Depression of the Songliao Basin were used in a transparent experimental device with pressure resistance. An initial filling pressure was selected to carry out a constant volume exhaust gas filling experiment. Experimental results showed that the crack-type medium needs a certain opening pressure and opening time to have high-efficiency transport ability, and once the crack is opened, even if the charging pressure is lower than the opening pressure, it still has the ability to transport until the charging pressure difference drops to zero. Among the porosity-permeability-type heterogeneous rock samples, gas migration path can be expressed as a finger plunging feature in medium porosity and permeability core. However, in the high porosity and permeability volcanic rock medium, a regular curtain-type periodic migration process of each pore-permeating unit during the filling process was observed. Overall, the constant volume filling pressure and decay time has an attenuation feature with an exponential relationship, and with the attenuation of filling pressure, natural gas migration speed is accompanied by the curtain characteristics of wave fluctuation. As the filling pressure continuously reduces, the range of curtain transport paths gradually reduces.

     

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