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Method for quantitatively representing sandstone reservoir hole throat structure by nuclear magnetic resonance coupling constant-speed mercury injection

A constant-speed mercury intrusion and nuclear magnetic resonance technology, which is applied in the directions of using nuclear magnetic resonance for analysis, material analysis through resonance, and measurement devices, can solve problems such as poor consistency and adaptability limitations, and is convenient for popularization, application and application. wide range of effects

Active Publication Date: 2019-08-16
RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires that the left peak of the quasi-full pore distribution and the NMR T 2 The spectra are basically the same. When the internal pore throat structure of the rock sample is complex, the quasi-full pore distribution and NMR T 2 There are multiple peaks in the spectrum, the consistency between the two becomes poor, and the adaptability of the method is limited

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  • Method for quantitatively representing sandstone reservoir hole throat structure by nuclear magnetic resonance coupling constant-speed mercury injection
  • Method for quantitatively representing sandstone reservoir hole throat structure by nuclear magnetic resonance coupling constant-speed mercury injection
  • Method for quantitatively representing sandstone reservoir hole throat structure by nuclear magnetic resonance coupling constant-speed mercury injection

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Embodiment 1

[0034] A method for quantitatively characterizing the pore-throat structure of sandstone reservoirs coupled with NMR coupled constant-speed mercury injection, the method is as follows:

[0035] 1) Select the full-scale core of the target sandstone reservoir, drill n pieces of small rock samples with a diameter of 38.1 mm or 25.4 mm and a length of 35-50 mm, and carry out NMR experiments on dry samples and saturated simulated formation water conditions respectively, and then Get the T in the saturated state after eliminating the influence of the dry sample 2 The relaxation time curve is further converted into T 2 Relaxation time proportion distribution curve;

[0036] Such as figure 1 as shown, figure 1 is the T under the saturation state after eliminating the influence of the dry sample obtained from the NMR experiment 2 The relaxation time curve, further transformed to obtain T 2 The distribution curve of the proportion of relaxation time, the abscissa is T 2 Relaxation...

Embodiment 2

[0042] A method for quantitatively characterizing the pore-throat structure of sandstone reservoirs coupled with NMR coupled constant-speed mercury injection, the method is as follows:

[0043] 1) Select the full-scale core of the target sandstone reservoir, drill n pieces of small rock samples with a diameter of 38.1 mm or 25.4 mm and a length of 35-50 mm, and carry out NMR experiments on dry samples and saturated simulated formation water conditions respectively, and then Get the T in the saturated state after eliminating the influence of the dry sample 2 The relaxation time curve is further converted into T 2 Relaxation time proportion distribution curve; where, T 2max for T 2 The maximum T with a non-zero proportion on the relaxation time proportion distribution curve 2 relaxation time;

[0044] 2) Carry out a constant-speed mercury injection experiment on all the above n small rock samples to obtain a constant-speed mercury injection pore-throat proportion distributio...

specific Embodiment

[0057] Sandstone tight reservoir in a certain area

[0058] 1) Select typical full-scale cores of tight sandstone reservoirs at the same horizon in this area, and drill 4 small rock samples (diameter 25.4mm, length 35.4-36.1mm);

[0059] 2) In accordance with the "Experimental Measurement Specifications for NMR Parameters of Rock Samples" (SY / T 6490-2014), the NMR experiments were carried out on four small rock samples under dry sample conditions, and then the small cores were subjected to saturated simulated formation water conditions. NMR experiment, get the T in saturation state after eliminating the influence of dry sample 2 The relaxation time curve is further converted into T 2 The relaxation time proportion distribution curve, such as Figure 4 shown; Figure 4 is the T of the 4 experimental rock samples 2 The relaxation time proportion distribution curve expresses the T 2 The distribution of relaxation times. It can be seen that the curves of the four experimenta...

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Abstract

The invention relates to a method for quantitatively representing a sandstone reservoir hole throat structure by nuclear magnetic resonance coupling constant-speed mercury injection. The method for quantitatively representing the sandstone reservoir hole throat structure by nuclear magnetic resonance coupling constant-speed mercury injection comprises the steps of selecting a full-size core of a target sandstone reservoir, drilling a small rock sample, and performing nuclear magnetic resonance experiment to obtain a T2 relaxation time duty ratio distribution curve; performing constant-speed mercury injection on the small rock sample to obtain a constant-speed mercury injection hole throat duty ratio distribution curve; coupling maximum relaxation time T<2max> and maximum hole throat radiumr<max> of the same small rock sample to obtain surface relaxation rate Phi of each small rock sample so that the surface relaxation rate Phi is used as the surface relaxation rate Phi of the target sandstone reservoir; and performing calculation to obtain complete effective hole throat radius duty ratio distribution map according to a nuclear magnetic resonance principle. By the method, thecomplete and effective hole throat relaxation time distribution characteristic can be non-destructively detected, the complete and effective hole throat radium duty ratio distribution map of the reservoir sandstone is obtained, and the quantitative representation of the effective hole throat structure distribution of the sandstone reservoir is achieved.

Description

technical field [0001] The invention belongs to the technical field of reservoir description of oil and gas reservoirs, and in particular relates to a method for quantitatively characterizing the pore throat structure of sandstone reservoirs by nuclear magnetic resonance coupled constant-speed mercury injection. Background technique [0002] The methods for evaluating reservoir pore-throat structure mainly include nuclear magnetic resonance, high-pressure mercury intrusion, constant-speed mercury intrusion, and scanning electron microscopy. Scanning electron microscopy cannot quantitatively characterize the three-dimensional pore-throat characteristics of reservoirs. High-pressure mercury injection reflects the throats corresponding to the pressure less than the maximum mercury injection and the pores controlled by them. Constant-speed mercury injection can only reflect the distribution characteristics of some throats and pores. Due to limitations of technical means and expe...

Claims

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Application Information

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IPC IPC(8): G01N24/08
CPCG01N24/081Y02A90/30
Inventor 王香增张磊辛翠平乔向阳施里宇李娜和向楠冯婷婷郭锦涛白慧芳王振国杜永慧刘喜祥
Owner RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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