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Application Of Core Nuclear Magnetic Resonance
Aug 10, 2017

The nuclear magnetic resonance response characteristics of the core have important basic guidance for the application of nuclear magnetic resonance technology to the development of oil and gas resources. The characteristics of hysteresis NMR T2 spectral response, magnetic porosity, tangential fluid T2 cutoff and rock specific surface distribution were studied by using NMR, gas centrifugation and other experimental techniques. Rock Core NMR & MRI The results show that the shale T2 spectrum can be divided into three types, namely, the unimodal T2 spectrum, the double peak T2 spectrum with isolated right peak and the bimodal T2 spectrum of the left and right peak distribution, the vast majority of shale The relaxation time is less than 10ms, Rock Core NMR & MRI and the fracture pores in the reservoir account for about 9.16% of the total pore space. The surface area of the shale based on the NMR spectrum is mainly distributed in the range of 3.59-80.51μm-1. Shale magnetic porosity is generally less than the measured porosity, the average error is about 22.33%, and clay pore, fracture pore development and other factors. Rock Core NMR & MRI The results show that the T2 cutoff value of the hydrodynamic fluid in the shale reservoir is 3.87-16.68ms, the average is 8.29ms, and the average of the free gas saturation of the rock mass is about 9.72%.

Core nuclear magnetic resonance applications

Development test and indoor core analysis

Nuclear magnetic resonance analysis

A, core hole permeability measurement:

1) Permeability

2) total porosity

3) movable fluid saturation

4) to bind fluid saturation

5) Oil saturation

6) Original free fluid saturation

B, pore size distribution analysis

C, fluid flow, distribution determination

D, sample water characteristics of the study

Core nuclear magnetic resonance imaging

A, two-dimensional imaging at any level

B, multi-level two-dimensional imaging

C, pore imaging observation

D, moisture content distribution rheological imaging observation

E, high pressure displacement environment of fluid distribution changes in two-dimensional imaging

On - site drilling cuttings and borehole coring analysis

1, nuclear magnetic cuttings logging analysis

2, lithologic logging reservoir evaluation, reduce the amount of coring, Rock Core NMR & MRI greatly increase the reservoir geological information. Rock Core NMR & MRI Real-time access to reservoir geological information, to guide the production

3, nuclear magnetic resonance borehole coring analysis

4, to provide mobile water content, quickly determine the flooding situation

Calibration of nuclear magnetic logging scale

Can carry out nuclear magnetic resonance logging scale calibration work, Rock Core NMR & MRI a substantial increase in nuclear logging interpretation accuracy