Impact of formation water on the generation of H2S in condensate reservoirs: a case study from the deep Ordovician in the Tazhong Uplift of the Tarim Basin, NW China
投稿时间:2016-09-25  
英文关键词:Formation water, Sulfate-CIPs, TSR, Condensates, Dolomite reservoir, Tarim basin
基金项目:The study is funded by the Natural Science Foundation of China (NSFC, Project No. 41473020) and the CNPC International Cooperation Project (Grant No. 2011A-0203-01). The extraction, separation, GC and GC–MS analyses were performed in the Key Laboratory of Petroleum Geology (KLPG), PetroChina. The Tarim Oilfield Company is thanked for providing the background geological information and data on formation water. The anonymous reviewers are gratefully acknowledged for their constructive comments that substantially improved the quality of this manuscript.
作者单位
Jin Su Key Laboratory of Petroleum Geochemistry, CNPC, Beijing 100083, China; State Key Laboratory for Enhancing Oil Recovery, Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China 
Yu Wang Key Laboratory of Petroleum Geochemistry, CNPC, Beijing 100083, China; State Key Laboratory for Enhancing Oil Recovery, Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China 
Xiao-Mei Wang Key Laboratory of Petroleum Geochemistry, CNPC, Beijing 100083, China; State Key Laboratory for Enhancing Oil Recovery, Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China 
Kun He Key Laboratory of Petroleum Geochemistry, CNPC, Beijing 100083, China; State Key Laboratory for Enhancing Oil Recovery, Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China 
Hai-Jun Yang Research Institute of Tarim Oilfield Company, PetroChina, Korla 841000, Xinjiang, China 
Hui-Tong Wang Key Laboratory of Petroleum Geochemistry, CNPC, Beijing 100083, China; State Key Laboratory for Enhancing Oil Recovery, Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China 
Hua-Jian Wang Key Laboratory of Petroleum Geochemistry, CNPC, Beijing 100083, China; State Key Laboratory for Enhancing Oil Recovery, Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China 
Bin Zhang Key Laboratory of Petroleum Geochemistry, CNPC, Beijing 100083, China; State Key Laboratory for Enhancing Oil Recovery, Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China 
Ling Huang Key Laboratory of Petroleum Geochemistry, CNPC, Beijing 100083, China; State Key Laboratory for Enhancing Oil Recovery, Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China 
Na Weng Key Laboratory of Petroleum Geochemistry, CNPC, Beijing 100083, China; State Key Laboratory for Enhancing Oil Recovery, Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China 
Li-Na Bi Key Laboratory of Petroleum Geochemistry, CNPC, Beijing 100083, China; State Key Laboratory for Enhancing Oil Recovery, Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China 
Zhi-Hua Xiao PetroChina Coalbed Methane Company Limited, Beijing 100028, China 
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英文摘要:
      A number of condensate reservoirs with high concentrations of H2S have been discovered in the deep dolomite reservoirs of the lower Ordovician Yingshan Formation (O1y) in the Tazhong Uplift, where the formation water has a high pH value. In the O1y reservoir, the concentrations of Mg2+ and SO42- in the formation water are higher than those in the upper Ordovician formation. The concentration of H2S in the condensate reservoirs and the concentration of Mg2+ in the formation water correlate well in the O1y reservoirs of the Tazhong Uplift, which indicates a presumed thermochemical sulfate reduction (TSR) origin of H2S according to the oxidation theory of contact ion-pairs (CIPs). Besides, the pH values of the formation water are positively correlated with the concentration of H2S in the condensate reservoirs, which may indicate that high pH might be another factor to promote and maintain TSR. Oil–source correlation of biomarkers in the sulfuretted condensates indicates the Cambrian source rocks could be the origin of condensates. The formation water in the condensate reservoirs of O1y is similar to that in the Cambrian; therefore, the TSR of sulfate-CIPs likely occurred in the Cambrian. High H2S-bearing condensates are mainly located near the No. 1 Fault and NE-SW strikeslip faults, which are the major migration pathway of deep fluids in the Tazhong Uplift. The redox between sulfate- CIPs and hydrocarbons is the generation mechanism of H2S in the deep dolomite condensate reservoirs of the Tazhong Uplift. This finding should be helpful to predict the fluid properties of deep dolomite reservoirs.
Jin Su,Yu Wang,Xiao-Mei Wang,Kun He,Hai-Jun Yang,Hui-Tong Wang,Hua-Jian Wang,Bin Zhang,Ling Huang,Na Weng,Li-Na Bi,Zhi-Hua Xiao,2017.Impact of formation water on the generation of H2S in condensate reservoirs: a case study from the deep Ordovician in the Tazhong Uplift of the Tarim Basin, NW China.Petroleum Science,(3):507~519.
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