沉积与特提斯地质2025，Vol.45Issue(2)：305-316,12.DOI:10.19826/j.cnki.1009-3850.2024.08001
塔里木盆地顺北4号断裂带凝析气藏硫化氢成因与富集主控因素
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
摘要
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.关键词
H2S成因/热化学硫酸盐还原反应(TSR)/走滑断裂/顺北油气田/塔里木盆地Key words
hydrogen sulfide origin/thermochemical sulfate reduction/strike-slip fault/Shunbei oil and gas field/Tarim Basin分类
天文与地球科学引用本文复制引用
徐征遥,韩强,贾星亮,杨红彩,卜旭强..塔里木盆地顺北4号断裂带凝析气藏硫化氢成因与富集主控因素[J].沉积与特提斯地质,2025,45(2):305-316,12.基金项目
"十三五"国家重大科技专项(2016ZX05005-004) （2016ZX05005-004）
中国石化科技部项目(P21085-8,P23244) （P21085-8,P23244）
