Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (2): 66-74.doi: 10.12108/yxyqc.20220206

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Thermochemical sulfate reduction(TSR) and reservoir reformation of the upper Paleogene Xiaganchaigou Formation in Yingxi area, Qaidam Basin

ZHAO Sisi1, LI Jianming1,2, LIU Jincheng3, LI Jiyong3, CUI Jun3   

  1. 1. School of Geosciences, Yangtze University, Wuhan 430100, China;
    2. Cooperative Innovation Center of Unconventional Oil and Gas, Yangtze University(Ministry of Education & Hubei Province), Wuhan 430100, China;
    3. Research Institute of Exploration and Development, PetroChina Qinghai Oilfield Company, Dunhuang 736202, Gansu, China
  • Received:2021-10-08 Revised:2021-12-20 Online:2022-03-01 Published:2022-03-14

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Abstract: As an important mechanism of dissolution, thermochemical sulfate reduction(TSR) is of great significance in reservoir research. Through the analysis of core observation, thin section identification, scanning electron microscope and logging data, the TSR characteristics and its effect on reservoir reformation of the upper member of Xiaganchaigou Formation in Yingxi area of Qaidam Basin were studied. The results show that:(1) The reactants of TSR are mainly hydrocarbons and sulfate rocks, and the products are high-content H2S, CO, altered hydrocarbons, calcite, elemental sulfur, pyrite, sulfur-containing organic matter. The initial reaction temperature is 100-140℃, corresponding to the formation depth of 3 113-4 536 m in Yingxi area.(2) TSR of the upper member of Xiaganchaigou Formation in Yingxi area resulted that carbonate pores and fractures were filled with modified minerals such as granular and massive pyrite, elemental sulfur and asphalt. The δ34S value of sulfurbearing minerals is relatively heavy. The hydrocarbon components of natural gas are characterized by high methane content and low heavy hydrocarbon content, and the dryness coefficient is larger. The carbon isotope δ13 C1 and δ13 C2 values are larger, and the TSR products such as H2S and relatively high content of CO2 are common. The salinity of formation water is low.(3) TSR related fluids reformed carbonate reservoir, and burial dissolution developed, forming pore systems of different sizes, with an average pore increase rate of 3.5%, which optimized reservoir physical properties.

Key words: thermochemical sulfate reduction(TSR), dissolved pore and vug, reservoir reformation, upper Xiaganchaigou Formation, Paleogene, Yingxi area, Qaidam Basin

CLC Number: 

  • TE122.2
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