Method for analyzing heterogeneous property of oil reservoir

Abstract

The invention relates to a method for analyzing the heterogeneous property of an oil reservoir. The method comprises the following steps that 1, water injection parameters of a water injection well are collected, and a relative apparent water injectivity index Xi reflecting the water absorbing capacity of the oil reservoir is obtained; 2, the water injection intensity of each layer of a water absorbing profile of the water injection well is collected, and a water absorbing profile Lorentz coefficient Vi reflecting the heterogeneous property of the water absorbing profile of the water injection well is obtained through the Lorentz coefficient method; 3, fluid producing parameters of an oil well are collected, and a fluid producing intensity Lorentz coefficient Yi reflecting the fluid producing intensity of the oil well is obtained through the Lorentz coefficient method; 4, water cut rising parameters of the oil well are collected, and a well group water cut rising variable coefficient Wi reflecting the water cut rising differences of the oil well is obtained; 5, the fluid producing intensity of each layer of a production profile of the oil well is collected, and a production profile Lorentz coefficient Zi reflecting the heterogeneous property of the production profile of the oil well is obtained through the Lorentz coefficient method; and 6, a fuzzy decision-making evaluation model is built, and a comprehensive decision-making factor Fi is obtained. According to the method for analyzing the heterogeneous property of the oil reservoir, the heterogeneous property of the oil reservoir is quantified, and bases are provided for development and adjustment of oil fields.

Description

technical field [0001] The invention belongs to the field of well logging geology, and in particular relates to a method for analyzing the heterogeneity properties of oil reservoirs. Background technique [0002] Reservoir development and adjustment is often carried out around the heterogeneity of the reservoir. For low-permeability reservoirs with a single layer thickness of about 1.0m and multi-layer joint production and injection, the description of interlayer and plane heterogeneity is as follows: appears to be very important. Reservoir heterogeneity refers to the property that various properties of the reservoir change with its spatial location, mainly manifested in the heterogeneity of rock material composition and the heterogeneity of pore space. At present, the identification of reservoir heterogeneity is directly obtained by drilling reservoir cores, and the statistical or Dykstrah method is used to analyze the difference in reservoir permeability. This method is t...

AI Technical Summary

Problems solved by technology

However, the application in low-permeability reservoirs has limitations, as the depressurization process of injection wells in low-permeability reservoirs is slow, and this method cannot reflect the heterogeneity between layers.

Images