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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2019  >  41(2): 268-273
HOU Guoru. Genesis of hydrogen sulfide in Du 84 block, Liaohe Oilfield[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2019, 41(2): 268-273. doi: 10.11781/sysydz201902268
Citation: HOU Guoru. Genesis of hydrogen sulfide in Du 84 block, Liaohe Oilfield[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2019, 41(2): 268-273. doi: 10.11781/sysydz201902268
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Genesis of hydrogen sulfide in Du 84 block, Liaohe Oilfield

doi: 10.11781/sysydz201902268

  • Liaohe Oilfield Company, PetroChina, Panjin, Liaoning 124010, China

  • Received Date: 2018-06-19
  • Rev Recd Date: 2019-01-28
  • Publish Date: 2019-03-28
    Abstract
  • During the thermal recovery of extra heavy oil in the Liaohe Oilfield, the concentration of H2S increased, which results in the increased cost of the desulfurization facility and oil-and-gas treatment. Crude oil, associated gas, formation water and reservoir minerals were analyzed and the H2S production had no significant correlation with the sulfur content in the crude oil and the SO42- concentration in the formation water, but had a good covariance with the pyrite content in reservoir. The sulfur in pyrite had biological source, and its isotopic range was basically consistent with that of crude oil, which originates in the thickening stage of crude oil and forms in large quantities in the thermal recovery stage of heavy oil. Except for the thermal decomposition of organic sulfur compounds (TDS) and thermochemical sulfate reduction (TSR), the thermal simulation experiment shows that the decomposition of pyrite is also one of the ways to produce H2S in the process of steam thermal recovery. When injected, lower salinity steam dilutes the formation water and pyrite decomposition becomes the main source of H2S. The production concentration of hydrogen sulfide was controlled by reservoir geology, the thermal recovery method, heating time and temperature.

     

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