Injection-production pattern constructing method for carbonatite fault-karst reservoir

Abstract

The invention discloses an injection-production production pattern constructing method for a carbonatite fault-karst reservoir. The method includes the steps that a geophysics method is used for recognizing and representing a fracture-cavity structure of carbonatite fault-karst; based on recognition and representation of the fracture-cavity structure, a conceptual model of the carbonatite fault-karst is obtained in an abstract equivalent way; based on representation and the conceptual model for the fracture-cavity structure, a mechanism model for the carbonatite fault-karst is established, and according to the mechanism model, an injection-production pattern for the carbonatite fault-karst reservoir is designed.

Description

technical field [0001] The invention belongs to the technical field of energy development of unconventional oil and gas reservoirs, and in particular relates to an injection-production well pattern construction method for carbonate rock fault-karst reservoirs. Background technique [0002] At present, the development of injection-production well patterns for conventional clastic rock reservoirs has been relatively mature. The existing injection-production well patterns mainly include regular well patterns and irregular well patterns, and regular well patterns include row-column well patterns and area well patterns. Row-column well patterns are suitable for reservoirs with large distribution area, good ductility, and good physical properties; area well patterns are suitable for reservoirs with poor ductility and low flow coefficient; irregular well patterns are suitable for oil reservoirs with small oil-bearing area, A reservoir with uneven distribution of oil layers. [000...

AI Technical Summary

Problems solved by technology

[0005] 1. Conventional injection-production well patterns are mainly suitable for sandstone reservoirs with relatively complete reservoir structure, certain ductility, certain continuity on the reservoir plane, and certain regularity in oil-water distribution, while carbonate rock fault-karst reservoirs The type of reservoir space is mainly karst caves, the regularity of reservoir distribution is poor, and the ductility on the plane is extremely poor, so conventional well patterns are difficult to apply

[0006] 2. The well pattern deployment mode of carbonate rock fault-karst reservoirs in Tahe Oilfield is generally based on oil wells, and only when the oil wells have no production potential will they consider re-injection. Although this method of repairing the dead has some effects, the side effects are also very serious obvious

First of all, the relationship between it and adjacent wells is not clear, which may easily lead to ineffective water injection or water flooding of adjacent wells; secondly, the well layout method without the guidance of a unified well pattern construction method greatly reduces the displacement efficiency between injection and production wells

[0007] To sum up, the traditional injection-production well pattern deployment method is not suitable for carbonate fault-karst reservoirs, and there is currently no well pattern deployment idea and method for reference in this type of reservoir

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