Lithologic Reservoirs ›› 2026, Vol. 38 ›› Issue (2): 194-200.doi: 10.12108/yxyqc.20260217

• PETROLEUM ENGINEERING AND OIL & GAS FIELD DEVELOPMENT • Previous Articles    

Evaluation method for water influx in fault-karst reservoirs: Taking Ordovician Yijianfang Formation reservoir in Shunbei-1 area as an example

LIU Hong1(), ZHANG Wenxue2   

  1. 1 School of Science， East China University of Technology， Nanchang 330013， China
    2 No. 4 Oil Production Plant， Sinopec Northwest Oilfield Branch， Akesu 843000， Xinjiang， China
  • Received:2025-07-02 Revised:2025-10-13 Online:2026-03-01 Published:2025-12-05

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Abstract:

The fault-karst reservoir of Shunbei-1 area in Tarim Basin exhibits a non-monotonic trend in formation pressure, initially decreasing and then rebounding as cumulative production increases. This phenomenon cannot be explained by traditional water influx models， but aligns more closely with progressive development behavior. Based on the concept of “sequential mobilization” and material balance theory, the water influx process is divided into pre-water influx and post-water influx, with evaluation models respectively established for dynamic reserves and aquifer volume. The results show that： （1） Ordovician reservoir in Shunbei Oilfield is a typical fault-karst reservoir, characterized by a stereoscopic model of narrow horizontal strips and large vertical spans. It is controlled by the NE-trending strike-slip fault system. The carbonate reservoir of Yijianfang Formation is a “fault-karst” type reservoir with poor physical properties, and fault-karst bodies are continuously distributed along major fault zones. （2） The newly established water influx evaluation model can be used to calculate dynamic reserves, water influx rate, and dynamic aquifer volume of fault-karst reservoirs in the research area, thereby determining single-well controlled geological reserves and aquifer size. The plot of cumulative liquid production (subsurface volume) versus dynamic reserves exhibits a plateau segment, with the plateau onset indicating the start of water influx. The dynamic reserves at this point represent the single-well controlled geological reserves. The plot of cumulative liquid production (subsurface volume) versus mobilized oil-water volume ratio also shows a plateau at its terminus. The plateau height minus 1 yields the aquifer volume ratio. （3） In the study area application, the model successfully calculated a maximum dynamic reserves of 126.17×104 m3 and a maximum mobilized aquifer volume of 182 times the geological reserves. The model provides a rational explanation for the pressure variations observed during water influx in fault-karst reservoirs.

Key words: fault-karst reservoir, water influx, material balance, dynamic reserves, aquifer volume, Yijianfang Formation, Ordovician, Shunbei-1 area, Tarim Basin

CLC Number: 

  • TE344

Fig. 1

Regional location of Shunbei Oilfield （a） and comprehensive stratigraphic column of Ordovician （b）, Tarim Basin"

Fig. 2

Stereoscopic model of Ordovician fault-karst reservoir in Shunbei Oilfield"

Fig. 3

Simplified schematic diagram of water influx in Ordovician fault-karst reservoir， Shunbei Oilfield"

Fig. 4

Variation of dynamic reserves with cumulative liquid production (subsurface volume) of Ordovician Yijianfang Formation in well SHB1-9 of Shunbei-1 area"

Fig. 5

Variation of cumulative liquid production (subsurface volume) with convert volume factor of Ordovician Yijianfang Formation in well SHB1-9 of Shunbei-1 area"

Fig. 6

Variation of mobilized oil-water volume ratio with cumulative liquid production (subsurface volume) of Ordovician Yijianfang Formation in well SHB1-9 of Shunbei-1 area"

Fig. 7

Water influx rate, liquid production rate, and pressure change curves of Ordovician Yijianfang Formation in well SHB1-9 of Shunbei-1 area"

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