Method for determining rock electricity parameters of digitalized core

Abstract

The invention relates to a method for determining rock electricity parameter m and n values of a digitalized core, which comprises the following steps of: performing quick nuclear magnetic measurement and calculation on the selected core to obtain nuclear magnetic T2 spectrum and porosity core digitalized data volume; calculating a cementation index m and a saturation index n through a formula respectively; and substituting a logging calculation stratum porosity of an un-cored well field into the established function relations of the cementation index and the saturation index respectively to obtain a cementation index m value and a saturation index n value of the un-cored well field. The method can quickly solve the m and n values, can reach the experimental test effects of the laboratorial conventional standard flow experiments and calculation and acquisition, solves the problem that the rock electricity parameter m and n values cannot be acquired in short time in a laboratory, is convenient and quick to solve, can timely serve or meet the requirements of actual production, and has good application effect.

Description

technical field The invention relates to the technical field of petroleum well logging, in particular to a method for determining the values ​​of rock electric parameters m and n after the digitization of rock cores. Background technique In the field of petroleum exploration and well logging technology, the determination of cementation index m and saturation index n of reservoir rock electrical parameters is usually done by selecting a series of cores that can represent the geological characteristics of the area, according to the "Core Analysis Method (SY / T 5336 -2006)" standard procedures for experiments and calculations to obtain the core porosity φ, wherein the core porosity φ is a decimal; according to the standard procedure of "Rock Resistivity Parameters Laboratory Measurement and Calculation Methods (SY / T 5385-1991)" Carry out experiments and calculations to obtain the core cementation index m value, saturation index n value, lithology coefficient a, b value. The ro...

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Problems solved by technology

The rock-electricity experiment first requires the core to be fully saturated with formation water. However, it often takes a long time period to completely saturate the rock core or reach different degrees of water saturation. For rock-electricity experiments with low porosity and low permeability cores, the The experiment period will be longer. Due to the limitation of production time and conditions, the values ​​of rock electric parameters m and n cannot be in accordance with the standard of "Measurement and Calculation Method of Rock Resistivity Parameters in Laboratory (SY / T 5385-1991)" in a short period of time. The process is obtained through experiments and calculations, resulting in the failure of the rock power parameters m and n values ​​to serve in time and meet the actual needs of production

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