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Copyright © 2023. The American Association of Petroleum Geologists. All rights reserved.
DOI:10.1306/12212318282
Multi-phase pools caused by gas invasion in deep Ordovician carbonates from the Tazhong area, Tarim Basin, China
Zhiyao Zhang11 , Yijie Zhang2 , Guangyou Zhu2 , Jianfa Han3 , and Linxian Chi2
1 School of Earth Resources, China University of Geosciences, Wuhan 430074, China
2 Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
3 Research Institute of Petroleum Exploration and Development, Tarim Oilfield Company, PetroChina, Korla 841000, China
Ahead of Print Abstract
invaded
previously charged oil pools in Ordovician carbonates, changing the reservoir fluid characteristics and fluid phases. Thus, condensates were formed owing to the introduction of excessive deep gas into the primary oil. The amount of gas invasion decreased with increasing distance from the strike-slip faults, thus forming multi-phase pools with a spatial distribution pattern. Oil pools near strike-slip faults are more affected by gas invasion than weakly altered volatile oil pools and unaltered oil pools with greater distances away. The oil pools near the faults form condensate pools that show enrichment of H2S and carbon isotopic fractionation in C2-C4 gas components. This study provides new insights into the causal mechanism and distribution of multi-phase pools in superdeep strata and has great potential for petroleum exploration in deeply buried Ordovician carbonates in the Tarim Basin.
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