Quantitative reconstruction of phase states and evolution of condensate and gas in the western Kelasu Thrust Belt, Kuqa Depression, Tarim Basin
Abstract Various oil-gas reservoirs have been discovered in the Lower Cretaceous Beshijiqike Formation in the western Kelasu Thrust Belt, Kuqa Depression, Tarim Basin. However, uncertain evolutionary characteristics, physical properties, and formation process for diverse phase states hinder further...
Saved in:
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2025-06-01
|
| Series: | Scientific Reports |
| Subjects: | |
| Online Access: | https://doi.org/10.1038/s41598-025-03736-8 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850137714272239616 |
|---|---|
| author | Zhihua He Chengsheng Chen Chao Wu Shuyong Shi Tao Mo Min Liu Naidong Chen Yunpeng Wang |
| author_facet | Zhihua He Chengsheng Chen Chao Wu Shuyong Shi Tao Mo Min Liu Naidong Chen Yunpeng Wang |
| author_sort | Zhihua He |
| collection | DOAJ |
| description | Abstract Various oil-gas reservoirs have been discovered in the Lower Cretaceous Beshijiqike Formation in the western Kelasu Thrust Belt, Kuqa Depression, Tarim Basin. However, uncertain evolutionary characteristics, physical properties, and formation process for diverse phase states hinder further petroleum exploration and development. In this study, we reconstructed models of phase state evolution of six wells integrating PVT simulation and basin modeling. The results indicated that the temperature and pressure of reservoirs increased slowly before the Neogene, and then rapidly reached present value. The density and viscosity of the liquid phase decreased gradually, whereas that of the gas phase to the contrary. The reservoir fluids of all wells except for well DB-302 experienced phase differentiation, changing from gas-liquid coexistence phase (GLCP) to liquid or condensate phase. Three evolutional pathways for the reservoir fluids represent three distinct scenarios: (1) Transition from GLCP to liquid phase, resulting from the reservoir formation mechanism by mainly early oil charge with no or minor late gas charge. (2) Transition from GLCP to condensate phase, resulting from the reservoir formation mechanism by early oil charge and subsequent gas charge. (3) Continuous maintenance in the gas phase, resulting from the reservoir formation mechanism by a large amount of late gas charge with no or very small amount of early oil charge. We proposed a pattern of two early stages of oil-filling followed by a later gas-charging stage, and suggested faults and covariations of trap formation timing with main hydrocarbon generation period are the main factors controlling phase states of the study area. Our results are significant for predicting fluid phase state of the study area. |
| format | Article |
| id | doaj-art-61a3ddf729f948d2996d6bfb4fba494b |
| institution | OA Journals |
| issn | 2045-2322 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj-art-61a3ddf729f948d2996d6bfb4fba494b2025-08-20T02:30:46ZengNature PortfolioScientific Reports2045-23222025-06-0115112010.1038/s41598-025-03736-8Quantitative reconstruction of phase states and evolution of condensate and gas in the western Kelasu Thrust Belt, Kuqa Depression, Tarim BasinZhihua He0Chengsheng Chen1Chao Wu2Shuyong Shi3Tao Mo4Min Liu5Naidong Chen6Yunpeng Wang7State Key Laboratory of Deep Earth Processes and Resources, Chinese Academy of SciencesState Key Laboratory of Deep Earth Processes and Resources, Chinese Academy of SciencesResearch Institute of Petroleum Exploration and Development, Tarim Oilfield CompanyState Key Laboratory of Deep Earth Processes and Resources, Chinese Academy of SciencesResearch Institute of Petroleum Exploration and Development, Tarim Oilfield CompanyState Key Laboratory of Deep Earth Processes and Resources, Chinese Academy of SciencesResearch Institute of Petroleum Exploration and Development, Tarim Oilfield CompanyState Key Laboratory of Deep Earth Processes and Resources, Chinese Academy of SciencesAbstract Various oil-gas reservoirs have been discovered in the Lower Cretaceous Beshijiqike Formation in the western Kelasu Thrust Belt, Kuqa Depression, Tarim Basin. However, uncertain evolutionary characteristics, physical properties, and formation process for diverse phase states hinder further petroleum exploration and development. In this study, we reconstructed models of phase state evolution of six wells integrating PVT simulation and basin modeling. The results indicated that the temperature and pressure of reservoirs increased slowly before the Neogene, and then rapidly reached present value. The density and viscosity of the liquid phase decreased gradually, whereas that of the gas phase to the contrary. The reservoir fluids of all wells except for well DB-302 experienced phase differentiation, changing from gas-liquid coexistence phase (GLCP) to liquid or condensate phase. Three evolutional pathways for the reservoir fluids represent three distinct scenarios: (1) Transition from GLCP to liquid phase, resulting from the reservoir formation mechanism by mainly early oil charge with no or minor late gas charge. (2) Transition from GLCP to condensate phase, resulting from the reservoir formation mechanism by early oil charge and subsequent gas charge. (3) Continuous maintenance in the gas phase, resulting from the reservoir formation mechanism by a large amount of late gas charge with no or very small amount of early oil charge. We proposed a pattern of two early stages of oil-filling followed by a later gas-charging stage, and suggested faults and covariations of trap formation timing with main hydrocarbon generation period are the main factors controlling phase states of the study area. Our results are significant for predicting fluid phase state of the study area.https://doi.org/10.1038/s41598-025-03736-8PVT simulationBasin modelingTectonic compressionReservoir trap formationHydrocarbons accumulation process |
| spellingShingle | Zhihua He Chengsheng Chen Chao Wu Shuyong Shi Tao Mo Min Liu Naidong Chen Yunpeng Wang Quantitative reconstruction of phase states and evolution of condensate and gas in the western Kelasu Thrust Belt, Kuqa Depression, Tarim Basin Scientific Reports PVT simulation Basin modeling Tectonic compression Reservoir trap formation Hydrocarbons accumulation process |
| title | Quantitative reconstruction of phase states and evolution of condensate and gas in the western Kelasu Thrust Belt, Kuqa Depression, Tarim Basin |
| title_full | Quantitative reconstruction of phase states and evolution of condensate and gas in the western Kelasu Thrust Belt, Kuqa Depression, Tarim Basin |
| title_fullStr | Quantitative reconstruction of phase states and evolution of condensate and gas in the western Kelasu Thrust Belt, Kuqa Depression, Tarim Basin |
| title_full_unstemmed | Quantitative reconstruction of phase states and evolution of condensate and gas in the western Kelasu Thrust Belt, Kuqa Depression, Tarim Basin |
| title_short | Quantitative reconstruction of phase states and evolution of condensate and gas in the western Kelasu Thrust Belt, Kuqa Depression, Tarim Basin |
| title_sort | quantitative reconstruction of phase states and evolution of condensate and gas in the western kelasu thrust belt kuqa depression tarim basin |
| topic | PVT simulation Basin modeling Tectonic compression Reservoir trap formation Hydrocarbons accumulation process |
| url | https://doi.org/10.1038/s41598-025-03736-8 |
| work_keys_str_mv | AT zhihuahe quantitativereconstructionofphasestatesandevolutionofcondensateandgasinthewesternkelasuthrustbeltkuqadepressiontarimbasin AT chengshengchen quantitativereconstructionofphasestatesandevolutionofcondensateandgasinthewesternkelasuthrustbeltkuqadepressiontarimbasin AT chaowu quantitativereconstructionofphasestatesandevolutionofcondensateandgasinthewesternkelasuthrustbeltkuqadepressiontarimbasin AT shuyongshi quantitativereconstructionofphasestatesandevolutionofcondensateandgasinthewesternkelasuthrustbeltkuqadepressiontarimbasin AT taomo quantitativereconstructionofphasestatesandevolutionofcondensateandgasinthewesternkelasuthrustbeltkuqadepressiontarimbasin AT minliu quantitativereconstructionofphasestatesandevolutionofcondensateandgasinthewesternkelasuthrustbeltkuqadepressiontarimbasin AT naidongchen quantitativereconstructionofphasestatesandevolutionofcondensateandgasinthewesternkelasuthrustbeltkuqadepressiontarimbasin AT yunpengwang quantitativereconstructionofphasestatesandevolutionofcondensateandgasinthewesternkelasuthrustbeltkuqadepressiontarimbasin |