Gravitational differentiation characteristics of condensate gas reservoir with fault-controlled fracture-cavity structure in second block of Shunbei Oil and Gas Field: A case study of No. 4 fault zone
The condensate gas reservoirs with fault-controlled fracture-cavity structures in Shunbei area represent a significant breakthrough in oil and gas exploration within Tarim Basin in recent years. Its efficient development holds great importance for formulating the oil and gas resource strategy in wes...
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Editorial Office of Petroleum Geology and Recovery Efficiency
2025-01-01
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| Series: | Youqi dizhi yu caishoulu |
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| Online Access: | https://yqcs.publish.founderss.cn/thesisDetails#10.13673/j.pgre.202310007&lang=en |
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| author | MA Longjie HU Wenge HE Xinming CAO Fei LI Zongyu BAO Dian |
| author_facet | MA Longjie HU Wenge HE Xinming CAO Fei LI Zongyu BAO Dian |
| author_sort | MA Longjie |
| collection | DOAJ |
| description | The condensate gas reservoirs with fault-controlled fracture-cavity structures in Shunbei area represent a significant breakthrough in oil and gas exploration within Tarim Basin in recent years. Its efficient development holds great importance for formulating the oil and gas resource strategy in western China. The second block of Shunbei Oil and Gas Field provides the primary production of oil and gas in this area， characterized by thick and plate-like reservoir spaces. Both field production and laboratory experiments confirmed that gravitational differentiation significantly influences the vertical distribution of fluids， thereby affecting the formulation of effective development policies. However， there is less research on quantifying gravitational differentiation. The No. 4 fault zone in the second block of Shunbei Oil and Gas Field was taken as the research objective in this paper， and high-temperature and high-pressure fluid phase experiments were conducted on production wells within this study area， along with visual phase experiments to achieve quantitative characterization of gravitational differentiation. Additionally， a component gradient theoretical model was constructed based on thermodynamics and molecular dynamics principles. Exhaustion and gas injection experiments revealed that gravity sedimentation exacerbates reverse condensation phenomena while demonstrating clear evidence of gravity overlap between dry and wet gases during injection processes. By utilizing both theoretical models derived from component gradients and experimental results， the paper successfully quantified a gravitational differentiation index and determined that the theoretical model of non-isothermal component gradients was more suitable for quantitatively characterizing the gravitational differentiation index within the study area. The results show that the influence of gravitational differentiation on light components and heavy components is more significant， but its impact on intermediate components is relatively small. With the increase in depth， the proportion of heavy components increases gradually， and condensate gas reservoirs change into volatile reservoirs. The influence of gravity on the density of condensate gas reservoirs with high molar content of heavy components is more significant. The gas injection experiment results show that the gravity overlap between dry and wet gases is obvious， and the condensate gas and dry gas show an obvious gas-gas interface. The top gas injection is dominated by gravity displacement and supplemented by diffusion mixing， while the bottom gas injection is the opposite. |
| format | Article |
| id | doaj-art-2a585d63d07140989e4b880aa2a91a10 |
| institution | DOAJ |
| issn | 1009-9603 |
| language | zho |
| publishDate | 2025-01-01 |
| publisher | Editorial Office of Petroleum Geology and Recovery Efficiency |
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| series | Youqi dizhi yu caishoulu |
| spelling | doaj-art-2a585d63d07140989e4b880aa2a91a102025-08-20T02:45:02ZzhoEditorial Office of Petroleum Geology and Recovery EfficiencyYouqi dizhi yu caishoulu1009-96032025-01-0132111610.13673/j.pgre.2023100071009-9603（2025）01-0001-16Gravitational differentiation characteristics of condensate gas reservoir with fault-controlled fracture-cavity structure in second block of Shunbei Oil and Gas Field: A case study of No. 4 fault zoneMA Longjie0HU Wenge1HE Xinming2CAO Fei3LI Zongyu4BAO Dian5SINOPEC Geophysical Research Institute， Nanjing City， Jiangsu Province， 211103， ChinaResearch Institute of Exploration and Development， Northwest Oilfield Company， SINOPEC， Urumąi， Xinjiang， 830011， ChinaResearch Institute of Exploration and Development， Northwest Oilfield Company， SINOPEC， Urumąi， Xinjiang， 830011， ChinaResearch Institute of Exploration and Development， Northwest Oilfield Company， SINOPEC， Urumąi， Xinjiang， 830011， ChinaResearch Institute of Exploration and Development， Northwest Oilfield Company， SINOPEC， Urumąi， Xinjiang， 830011， ChinaResearch Institute of Exploration and Development， Northwest Oilfield Company， SINOPEC， Urumąi， Xinjiang， 830011， ChinaThe condensate gas reservoirs with fault-controlled fracture-cavity structures in Shunbei area represent a significant breakthrough in oil and gas exploration within Tarim Basin in recent years. Its efficient development holds great importance for formulating the oil and gas resource strategy in western China. The second block of Shunbei Oil and Gas Field provides the primary production of oil and gas in this area， characterized by thick and plate-like reservoir spaces. Both field production and laboratory experiments confirmed that gravitational differentiation significantly influences the vertical distribution of fluids， thereby affecting the formulation of effective development policies. However， there is less research on quantifying gravitational differentiation. The No. 4 fault zone in the second block of Shunbei Oil and Gas Field was taken as the research objective in this paper， and high-temperature and high-pressure fluid phase experiments were conducted on production wells within this study area， along with visual phase experiments to achieve quantitative characterization of gravitational differentiation. Additionally， a component gradient theoretical model was constructed based on thermodynamics and molecular dynamics principles. Exhaustion and gas injection experiments revealed that gravity sedimentation exacerbates reverse condensation phenomena while demonstrating clear evidence of gravity overlap between dry and wet gases during injection processes. By utilizing both theoretical models derived from component gradients and experimental results， the paper successfully quantified a gravitational differentiation index and determined that the theoretical model of non-isothermal component gradients was more suitable for quantitatively characterizing the gravitational differentiation index within the study area. The results show that the influence of gravitational differentiation on light components and heavy components is more significant， but its impact on intermediate components is relatively small. With the increase in depth， the proportion of heavy components increases gradually， and condensate gas reservoirs change into volatile reservoirs. The influence of gravity on the density of condensate gas reservoirs with high molar content of heavy components is more significant. The gas injection experiment results show that the gravity overlap between dry and wet gases is obvious， and the condensate gas and dry gas show an obvious gas-gas interface. The top gas injection is dominated by gravity displacement and supplemented by diffusion mixing， while the bottom gas injection is the opposite.https://yqcs.publish.founderss.cn/thesisDetails#10.13673/j.pgre.202310007&lang=enfracture-cavity structurecondensate gas reservoirgravitational differentiationtheoretical model of component gradientshunbei |
| spellingShingle | MA Longjie HU Wenge HE Xinming CAO Fei LI Zongyu BAO Dian Gravitational differentiation characteristics of condensate gas reservoir with fault-controlled fracture-cavity structure in second block of Shunbei Oil and Gas Field: A case study of No. 4 fault zone Youqi dizhi yu caishoulu fracture-cavity structure condensate gas reservoir gravitational differentiation theoretical model of component gradient shunbei |
| title | Gravitational differentiation characteristics of condensate gas reservoir with fault-controlled fracture-cavity structure in second block of Shunbei Oil and Gas Field: A case study of No. 4 fault zone |
| title_full | Gravitational differentiation characteristics of condensate gas reservoir with fault-controlled fracture-cavity structure in second block of Shunbei Oil and Gas Field: A case study of No. 4 fault zone |
| title_fullStr | Gravitational differentiation characteristics of condensate gas reservoir with fault-controlled fracture-cavity structure in second block of Shunbei Oil and Gas Field: A case study of No. 4 fault zone |
| title_full_unstemmed | Gravitational differentiation characteristics of condensate gas reservoir with fault-controlled fracture-cavity structure in second block of Shunbei Oil and Gas Field: A case study of No. 4 fault zone |
| title_short | Gravitational differentiation characteristics of condensate gas reservoir with fault-controlled fracture-cavity structure in second block of Shunbei Oil and Gas Field: A case study of No. 4 fault zone |
| title_sort | gravitational differentiation characteristics of condensate gas reservoir with fault controlled fracture cavity structure in second block of shunbei oil and gas field a case study of no 4 fault zone |
| topic | fracture-cavity structure condensate gas reservoir gravitational differentiation theoretical model of component gradient shunbei |
| url | https://yqcs.publish.founderss.cn/thesisDetails#10.13673/j.pgre.202310007&lang=en |
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