Formation water mineralization degree test method based on nuclear magnetic resonance technology

Abstract

The invention relates to a formation water mineralization degree test method based on the nuclear magnetic resonance technology. Nuclear magnetic T2 spectrum curves of distilled water and formation waters with different mineralization degrees are drawn on the same map, so that a standard chart is established; distribution curves of nuclear magnetic T2 spectra of distilled water and simulated formation waters with different mineralization degrees under saturated states 0.01 Mu m, 0.1 Mu m, 1.0 Mu m and 10.0 Mu m are drawn on the same map, and the influence of the mineralization degrees on the occurrence states of the formation waters in different pore throat spaces is analyzed; T2 spectrum area differences Delta Si between areas surrounded by the nuclear magnetic T2 spectrum curves of distilled water and formation waters with different mineralization degrees and the axis X are calculated; a database of the areas surrounded by the nuclear magnetic T2 spectrum curves of distilled water and formation waters with different mineralization degrees and the X axis and the T2 spectrum area differences thereof is created; a fitting relation diagram between the mineralization degrees and the T2 spectrum area differences Delta Si is drawn, and a relation between both is established. The formation water mineralization degree test method based on the nuclear magnetic resonance technology cancharacterize the occurrence states of formation waters in different pore throat spaces and quickly and accurately calculate the mineralization degrees of the formation waters.

Description

technical field [0001] The invention particularly relates to a method for obtaining the salinity of formation water in the petroleum field, in particular to a method for testing the salinity of formation water based on nuclear magnetic resonance technology. Background technique [0002] The amount of inorganic salt contained in formation water is expressed by salinity, and the unit is generally expressed in mg / L. Studying the salinity of formation water has important practical guiding significance for the exploration and development of oilfield water, coalfield water, geothermal resources and other mines. At present, the methods for determining the salinity of oilfield formation water can basically be classified into two types: [0003] (1) Calculating formation water salinity by using logging data, including determining the formation water salinity of the well according to adjacent well formation water salinity data, using Archie's formula to determine formation water resi...

AI Technical Summary

Problems solved by technology

The test method has many steps and involves the determination of the core pore volume. For tight reservoirs, a large part or all of the formation water is distributed in the micropores, but the existing core pore volume testing technology is difficult to accurately determine the micropore volume. Pore ​​volume, leading to low accuracy in calculating formation water salinity

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