Dynamic reserve calculation method and system for fracture and cave type carbonatite oil reservoir fracture and cave unit

Abstract

The invention relates to a dynamic reserve calculation method and system for a fracture and cave type carbonatite oil reservoir fracture and cave unit. The method comprises a fracture and cave unit type division step, a material balance equation simplification step and a dynamic reserve calculation step. According to the method, firstly, the driving types of the fracture and cave unit are divided according to the communication relationship between the fracture and cave unit and a water body; then, a simplified material balance equation is obtained according to different driving types; then, the dynamic reserve calculation parameters in the material balance equation are optimized by combining production dynamic data through the combined relationship of the ground crude oil density, the natural gas relative density and the gas-oil ratio and the relationship between the elasticity modulus and the porosity; and the dynamic reserve in the dynamic reserve calculation parameters is calculated. The method and the system have the advantages that the precision and the accuracy of the dynamic reserve calculation result are improved; and the basis is provided for the oil reservoir development and exploration and the engineering layout.

Description

technical field [0001] The invention relates to the field of calculation methods for dynamic reserves of carbonate rock reservoirs, in particular to a method and system for calculating dynamic reserves of fracture-cavity units under fracture-cavity carbonate rock reservoirs. Background technique [0002] Most of the oil reservoirs rich in geological resources such as petroleum are buried deep underground, which is very unfavorable for the monitoring of direct exploitation and utilization. Only through monitoring can we indirectly grasp the static and dynamic data combined with experience to understand the oil reservoirs to be developed, grasp the dynamic changes of the reservoirs and The factors that affect the dynamic change of the reservoir provide the basis for the development and adjustment of the reservoir. At present, the calculation of dynamic reserves of reservoirs mostly adopts pressure drop curve method, pressure drop recovery curve method, water drive curve method...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problems in the prior art that the calculation of dynamic reserves by rough material balance simplification method or complex curve method leads to cumbersome calculation process of dynamic reserves, low calculation accuracy and poor accuracy, and provides a fracture-cavity carbonate rock oil The calculation method of dynamic reserves of fractured-vuggy units can define fractured-vuggy units and divide them according to different driving types of carbonate reservoirs, and combine the respective characteristics of the divided fracture-vuggy units with various measured and experimental data. The data simplifies the material balance equation, and then calculates the dynamic reserves of the reservoir. The material balance equation simplified by this method is simple and exquisite, so the calculation process is simple, and the dynamic reserve calculation has high precision and accuracy

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