Genesis and major controlling factors for the enrichment of hydrogen sulfide accumulation in the condensate gas reservoir of the Shunbei No. 4  fault zone,  Tarim Basin

XU Zhengyao; HAN Qiang; JIA Xingliang; YANG Hongcai; BU Xuqiang

doi:10.19826/j.cnki.1009-3850.2024.08001

2025 Vol. 45, No. 2

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XU Zhengyao, HAN Qiang, JIA Xingliang, YANG Hongcai, BU Xuqiang. 2025. Genesis and major controlling factors for the enrichment of hydrogen sulfide accumulation in the condensate gas reservoir of the Shunbei No. 4 fault zone, Tarim Basin. Sedimentary Geology and Tethyan Geology, 45(2): 305-316. doi: 10.19826/j.cnki.1009-3850.2024.08001

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XU Zhengyao, HAN Qiang, JIA Xingliang, YANG Hongcai, BU Xuqiang. 2025. Genesis and major controlling factors for the enrichment of hydrogen sulfide accumulation in the condensate gas reservoir of the Shunbei No. 4 fault zone, Tarim Basin. Sedimentary Geology and Tethyan Geology, 45(2): 305-316. doi: 10.19826/j.cnki.1009-3850.2024.08001

Genesis and major controlling factors for the enrichment of hydrogen sulfide accumulation in the condensate gas reservoir of the Shunbei No. 4 fault zone, Tarim Basin

1.
Experimental Testing Technology Center of Northwest Oilfield Branch Company, SINOPEC, Urumqi 830011, China
2.
Research Institute of Exploration and Exploitation, SINOPEC Northwest Company, Urumqi 830011, China

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Corresponding author: HAN Qiang, 105289562@qq.com

Received Date: 16 March 2024

Revised Date: 18 July 2024

Accepted Date: 13 August 2024

Publish Date: 20 June 2025

Abstract

Abstract

This study investigates the origin and enrichment process of hydrogen sulfide in the condensate gas reservoirs of the Shunbei No. 4 fault zone in the Tarim Basin. Gas samples from Ordovician gas reservoirs at different depths in Well Shunbei No. 4 were analyzed by chromatographic method to determine hydrogen sulfide and carbon dioxide concentrations. The geological origins of hydrogen sulfide were studied, and its controlling factors of enrichment were discussed. The results show that: (1) The fractured-cavity type condensate gas reservoirs from the Ordovician carbonates generally contain hydrogen sulfide, with concentrations ranging from 0.3% to 1.6%, which meets the standard of estimating hydrogen sulfide gas reserves and has good comprehensive utilization value. Moreover, the hydrogen sulfide concentrations positively correlate with the carbon dioxide concentrations, decreasing from south to north, indicating a low-sulfur hydrogen gas reservoir. (2) Hydrogen sulfide and carbon dioxide of the carbonate fracture-type in condensate gas reservoirs of the Shunbei No. 4 fault zone are products of thermochemical sulfate reduction (TSR). The deep, widely distributed Middle Cambrian salt rock provides the material basis for hydrogen sulfide generation, while hydrocarbon reservoirs formed in Cambrian subsalt strata provide hydrocarbons for the TSR process. The long-term increase in temperature due to the deep burial of Cambrian subsalt oil and gas reservoirs has created favorable conditions for the TSR process. (3) Strike-slip faults function as migration pathways for deep hydrogen sulfide into the Ordovician reservoirs. The thick Upper Ordovician mudstone provides excellent preservation conditions for the enrichment of hydrogen sulfide gas reservoirs. Consequently, geological factors such as Cambrian salt-rock, strik-slip fault connections, Upper Ordovician tight sealing and late-stage deep burial with high temperature have contributed to the enrichment of hydrogen sulfide in the Ordovician condensate gas reservoirs in eastern Shunbei, indicating the potential existence of high hydrogen sulfide gas reservoirs in deep Cambrian reservoirs of the Shunbei area.
- hydrogen sulfide origin /
- thermochemical sulfate reduction /
- strike-slip fault /
- Shunbei oil and gas field /
- Tarim Basin

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