玛湖凹陷西南地区二叠系油气藏相态类型及凝析油气地球化学特征

doi:10.12108/yxyqc.20240614

Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (6): 149-159.doi: 10.12108/yxyqc.20240614

• PETROLEUM EXPLORATION • Previous Articles Next Articles

Geochemical characteristics of Permian condensate oil and gas and phase types in southwest of Mahu Sag

WANG Yifeng^1,2, TIAN Jixian^1,2, LI Jian^1,2, QIAO Tong^3,4, LIU Chenglin^3,4, ZHANG Jingkun^3,4, SHA Wei⁵, SHEN Xiaoshuang⁵

1. Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China;
2. Key Laboratory of Gas Reservoir Formation and Development, CNPC, Langfang 065007, Hebei, China;
3. State Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum(Beijing), Beijing 102249, China;
4. College of Geosciences, China University of Petroleum(Beijing), Beijing 102249, China;
5. Research Institute of Petroleum Exploration & Development, PetroChina Qinghai Oilfield Company, Dunhuang 736200, Gansu, China

Received:2023-10-25 Revised:2023-12-26 Online:2024-11-01 Published:2024-11-04

Abstract

Abstract: The genetic types and its source of condensate oil and natural gas in Permian Formation，in southwest of Mahu Sag，is under controversy，the type of fluid phases is complex，which restricts the further expansion of deep oil and gas exploration in Mahu Sag. In this study，PVT phase simulation software was used to recover original reservoir fluid components oil and natural gas in Permian Formation，in southwest of Mahu Sag，com bined empirical statistical methods with P-T phase diagram to determine the phase types of discovered oil-gas reservoirs. The source and genetic types of different phase types of oil and gas is clarified by multiple means of geochemical analyses. The results show that：（1）The Permian oil and gas reservoirs in southwest of Mahu Sag are mainly distributed in Fengcheng and upper Urho Formation. The phase types of oil-gas reservoirs are multiple， black oil reservoir comes first，near critical high volatile reservoir and condensate gas reservoir（condensate gas reservoirs with oil rings and near-critical condensate gas reservoirs）comes second. Condensate gas reservoirs are mainly developed in Fengcheng Formation. The reservoir fluid components are mainly methane，and the content of C₇⁺ hydrocarbons is relatively small.（2）The parent organic matter type of the different phases oil in the Permian are slightly sapropelic，all of which are the products of the mature stage source rocks in the Fengcheng Formation. The condensate oil maturity is slightly higher than the other phase oil，and its physical properties are better than others，with the characteristics of low viscosity，low freezing point and low wax content.（3）The natural gas components in the Permian are mainly hydrocarbon gas，of which the average methane mole fraction is 86.21%， the non-hydrocarbon gas content is low，the maturity varies greatly，the value of R_o is 0.52%-2.39%. It is mainly the product of sapropelic source rocks in the Fengcheng Formation. The maturity of natural gas of the upper Urho Formation is higher，with an average R_o value of 1.99%，while the natural gas maturity of Fengcheng Formation is lower，with an average R_o value of 0.71%. The natural gas average R_o of the condensate gas reservoirs of the Fengcheng Formation is 0.85%.（4）Due to the influence of the Fengcheng Formation source rocks thermal evo lution difference and the difference reservoir physical properties，The Permian developed two sets of oil and gas accumulation systems，the oil and gas reservoirs of Fengcheng Formation are self-generation and self-reservation within the source rock，and the upper Urho Formation is lower-generation and upper-reservation outside the source rock.

Key words: fluid phases, condensate gas reservoir, oil-source correlation, sapropelics, methane, Fengcheng Formation, upper Urho Formation, Permian, Mahu Sag

CLC Number:

TE122.1

WANG Yifeng, TIAN Jixian, LI Jian, QIAO Tong, LIU Chenglin, ZHANG Jingkun, SHA Wei, SHEN Xiaoshuang. Geochemical characteristics of Permian condensate oil and gas and phase types in southwest of Mahu Sag[J].Lithologic Reservoirs, 2024, 36(6): 149-159.

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Geochemical characteristics of Permian condensate oil and gas and phase types in southwest of Mahu Sag

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