Lower limit computation method for reservoir forming physical property of effective reservoir layer under restraint of reservoir forming power and pore structure

Abstract

The invention relates to a lower limit method for the reservoir forming physical property of an effective reservoir layer under the restraint of reservoir forming power and pore structure, comprising the following step of: on the basis of building a function relationship between the tension force of an oil-water interface and the temperature of a stratum system, building a function relationship between the semidiameter and the permeability of a maximum through hole throat of a reservoir layer, and building a function relationship between K / phi and K of the reservoir layer under the restraint of hole throat structure type, computing the reservoir forming physical property lower limit of the effective reservoir layer under the restraint of the reservoir forming power and the pore structure under different stratum temperature conditions. The research result of the method is combined with the research result of the physical property recovery and the reservoir forming power recovery of the reservoir layer in the geological historical period, so that the effectiveness of the reservoir layer in the geological historical period can be evaluated, and the oil gas distribution law in the reservoir forming period can be analyzed, therefore, the method has an important meaning for guiding the oil-gas exploration and deployment.

Description

technical field [0001] The invention relates to the field of petroleum and natural gas exploration and development, in particular to a method for determining the lower limit of physical properties of effective reservoir accumulation under the constraints of accumulation dynamics and pore structure. Background technique [0002] The lower limit of effective reservoir physical properties refers to the minimum permeability and porosity of the reservoir that can seepage and store oil and gas under certain conditions of accumulation dynamics and oil-water properties during the oil and gas accumulation period. The lower limit of physical properties of effective reservoir accumulation is mainly affected by factors such as accumulation dynamics, fluid properties, reservoir properties, and formation temperature and pressure conditions. For example, the increase of accumulation power, the decrease of crude oil density and viscosity, and the decrease of secondary pore content in the re...

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Problems solved by technology

However, the current research on the lower limit of physical properties of effective reservoirs is mainly to find the lower limit of physical properties of effective reservoir recovery, and there is no research report on the lower limit of physical properties of effective reservoir accumulation

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