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
| Autor: | Yu Wang, Bin Zhang, Ling Huang, Jin Su, Huajian Wang, Huitong Wang, Xiaomei Wang, Na Weng, Haijun Yang, Kun He, Lina Bi, Zhi-Hua Xiao |
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| Rok vydání: | 2017 |
| Předmět: |
Science
020209 energy Dolomite Tarim basin Geochemistry Energy Engineering and Power Technology 02 engineering and technology Fault (geology) Structural basin 010502 geochemistry & geophysics 01 natural sciences chemistry.chemical_compound Geochemistry and Petrology 0202 electrical engineering electronic engineering information engineering Sulfate Petrology 0105 earth and related environmental sciences Sulfate-CIPs geography geography.geographical_feature_category Formation water Petroleum engineering Dolomite reservoir QE420-499 Geology equipment and supplies Geotechnical Engineering and Engineering Geology Mineral resource classification TSR Geophysics Fuel Technology Condensates Source rock chemistry Ordovician Economic Geology |
| Zdroj: | Petroleum Science, Vol 14, Iss 3, Pp 507-519 (2017) |
| ISSN: | 1995-8226 1672-5107 |
| DOI: | 10.1007/s12182-017-0176-z |
| Popis: | 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 SO4 2− 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 strike-slip 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. |
| Databáze: | OpenAIRE |
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