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The controlling factors and distribution prediction of H2S formation in marine carbonate gas reservoir, China

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Chinese Science Bulletin

Abstract

Generally, there are some anhydrites in carbonate reservoir, as H2S is also familiar in carbonate oil and gas reservoirs. Nowadays, natural gas with high H2S concentration is usually considered as TSR origin, so there is close relationship between H2S and anhydrite. On the contrary, some carbonate rocks with anhydrite do not contain H2S. Recently, researches show that H2S is only a necessary condition of H2S formation. The reservoir porosity, sulfate ion content within formation water, reservoir temperature, oil/gas and water interface, hydrocarbon and some elements of reservoir rock have great controlling effects on the TSR occurrence. TSR deoxidizes hydrocarbon into the acidic gas such as H2S and CO2, and the H2S formation is controlled by TSR occurrence, so the relationship among reaction room, the contact chance of sulfate ion and hydrocarbon, the reservoir temperature has great influence on the TSR reaction. H2S has relatively active chemical quality, so it is still controlled by the content of heavy metal ion. Good conditions of TSR reaction and H2S preservation are the prerequisite of H2S distribution prediction. This paper builds a predictive model based on the characteristic of natural gas reservoir with high H2S-bearing. In the porosity reservoir with anhydrite, the formation water is rich in sulfate and poor in heavy metal ion. Oil and gas fill and accumulate in the gas reservoir with good preservation conditions, and they suffered high temperature later, which indicates the profitable area of natural gas with high H2S-bearing.

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Authors and Affiliations

  1. Research Institute of Petroleum Exploration and Development, PetroChina, Beijing, 100083, China

    Zhu GuangYou, Zhang ShuiChang & Liang YingBo

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  1. Zhu GuangYou
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  2. Zhang ShuiChang
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  3. Liang YingBo
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Correspondence to Zhu GuangYou.

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Zhu, G., Zhang, S. & Liang, Y. The controlling factors and distribution prediction of H2S formation in marine carbonate gas reservoir, China. Chin. Sci. Bull. 52 (Suppl 1), 150–163 (2007). https://doi.org/10.1007/s11434-007-6022-8

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  • DOI: https://doi.org/10.1007/s11434-007-6022-8

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