Causes of variation in the concentration and distribution of H2S in carbonate reservoirs of the Feixianguan Formation, Lower Triassic in the eastern Sichuan Basin

Wang, Guangwei; Hao, Fang; Zou, Huayao; Li, Pingping

doi:10.1016/j.geoen.2022.211381

Cited by 4 publications

(1 citation statement)

References 26 publications

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“…The acidity of abundant H 2 S will cause corrosion and sulfide deposits in the pipelines during gas extractions 1 , 2 , and the toxic H 2 S may endanger the successful completion of the operation 3 , 4 . Therefore it is of great challenge to develop deeply-buried carbonate reservoir under complex geological conditions, e.g., high temperature and pressure, high H 2 S and CO 2 content 5 , 6 , and it is essential to assess the concentration of H 2 S before drilling 7 . The H 2 S-rich gas resource in China is up to 1 × 10 10 m 3 , which is widely distributed in large sedimentary basins with thick carbonate reservoirs, e.g., Bohai Bay Basin, Sichuan Basin, Tarim Basin and Ordos Basin 8 , 9 .…”

Section: Introductionmentioning

confidence: 99%

Microbial communities and their roles in the Cenozoic sulfurous oil reservoirs in the Southwestern Qaidam Basin, Western China

Jiao

Wang³

et al. 2023

Sci Rep

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The latest discovery of sulfurous natural gas marked a breakthrough in the Cenozoic natural gas exploration in the southwestern margin of Qaidam Basin. The 16S rRNA analyses were performed on the crude oil samples from H2S-rich reservoirs in the Yuejin, Shizigou and Huatugou profiles, to understand the sulfurous gas origin, which was also integrated with carbon and hydrogen isotopes of alkane and sulfur isotopes of H2S collected from the Yingxiongling Area. Results show that the microorganisms in samples can survive in the hypersaline reservoirs, and can be classified into multiple phyla, including Proteobacteria, Planctomycetes, Firmicutes, Bacteroidetes, and Haloanaerobiaeota. Methanogens are abundant in all of the three profiles, while sulfate-reducing bacteria are abundant in Yuejin and Huatugou profiles, contributing to the methane and H2S components in the natural gas. The carbon, hydrogen and sulfur isotopes of sulfurous natural gas in the Yingxiongling Area show that the natural gas is a mixture of coal-type gas and oil-type gas, which was primarily derived from thermal degradation, and natural gas from the Yuejin and Huatugou profiles also originated from biodegradation. The isotopic analysis agrees well with the 16S rRNA results, i.e., H2S-rich natural gas from the Cenozoic reservoirs in the southwest margin of the Qaidam Basin was primarily of thermal genesis, with microbial genesis of secondary importance.

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