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Method and system for optimizing nuclear magnetic resonance logging parameters, storage medium and electronic equipment

A nuclear magnetic resonance and well logging technology, which is applied in the use of nuclear magnetic resonance spectrum for measurement, magnetic resonance measurement, and electronic magnetic resonance/NMR detection, etc. Effects of optimizing reservoir parameters

Pending Publication Date: 2022-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The invention provides a method for optimizing nuclear magnetic resonance logging reservoir parameters, which solves the technical problem that the evaluation accuracy of nuclear magnetic resonance logging reservoir parameters decreases due to T2 spectral length relaxation noise, and completely eliminates the T2 spectral length relaxation noise, improving the accuracy of NMR logging reservoir parameter evaluation

Method used

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  • Method and system for optimizing nuclear magnetic resonance logging parameters, storage medium and electronic equipment
  • Method and system for optimizing nuclear magnetic resonance logging parameters, storage medium and electronic equipment
  • Method and system for optimizing nuclear magnetic resonance logging parameters, storage medium and electronic equipment

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no. 1 example

[0056] figure 1 It is a schematic flowchart of the method for optimizing NMR logging reservoir parameters in this embodiment.

[0057] In statistical mechanics and thermodynamics, relaxation time represents the time required for a system to go from an unstable steady state to a stable steady state. In synergetics, relaxation time can characterize the degree of influence of fast variables, and a short relaxation time indicates that fast variables are easy to eliminate. After a system in equilibrium is momentarily disturbed by the outside world, it must be able to return to the original equilibrium state after a certain period of time. This period of time experienced by the system is the relaxation time.

[0058]There are two types of relaxation time, namely T1 and T2. T1 is the spin-lattice or longitudinal relaxation time, and T2 is the spin-spin or transverse relaxation time.

[0059] T1 is spin lattice or longitudinal relaxation time, and the time constant T1 of longitudina...

no. 2 example

[0095] Fig. 5 is an effect diagram of the application of the denoised T2 spectrum in calculating the reservoir parameters of Well A in this embodiment.

[0096] In statistical mechanics and thermodynamics, relaxation time represents the time required for a system to go from an unstable steady state to a stable steady state. In synergetics, relaxation time can characterize the degree of influence of fast variables, and a short relaxation time indicates that fast variables are easy to eliminate. After a system in equilibrium is momentarily disturbed by the outside world, it must be able to return to the original equilibrium state after a certain period of time. This period of time experienced by the system is the relaxation time.

[0097] There are two types of relaxation time, namely T1 and T2. T1 is the spin-lattice or longitudinal relaxation time, and T2 is the spin-spin or transverse relaxation time.

[0098] T1 is spin lattice or longitudinal relaxation time, and the time ...

no. 3 example

[0128] Figure 6 It is a schematic flow chart of the method for obtaining denoised T2 in this embodiment

[0129] The present invention determines the T2 cut-off value of the T2 spectrum long relaxation noise by analyzing the NMR logging T2 spectrum form, calculates the denoising coefficient of the T2 spectrum, and then corrects the T2 spectrum to eliminate the influence of the long relaxation noise, providing well logging interpreters A more accurate T2 spectrum is used for logging reservoir interpretation and evaluation.

[0130] In this embodiment, a method for eliminating the relaxation noise of T2 spectral length in nuclear magnetic resonance logging includes:

[0131] First, analyze the NMR logging T2 spectrum shape to determine its noise T2 cut-off value,

[0132] The T2 spectral denoising coefficient distribution is then calculated according to its T2 cutoff value,

[0133] Finally, according to the T2 spectrum denoising coefficient distribution, the T2 spectrum is ...

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Abstract

The invention discloses a method and system for optimizing nuclear magnetic resonance logging reservoir parameters, a storage medium and electronic equipment. The method comprises the following steps that T2 values at different time points of nuclear magnetic resonance logging and corresponding amplitude values are obtained, and a T2 spectrum is obtained; obtaining a T2 cutoff value meeting a preset condition by searching the T2 spectrum; based on each T2 value and the T2 cut-off value, obtaining denoising coefficient distribution through calculation; and obtaining a denoised T2 spectrum through a second calculation formula based on each T2 value and the denoising coefficient distribution. According to the method, the porosity, the movable fluid volume and the permeability are calculated through the accurately denoised T2 spectrum, the accuracy and effectiveness of reservoir parameter evaluation are improved, and drilling of a detection oil well is facilitated.

Description

technical field [0001] The invention relates to the technical field of geophysical well logging in oil and gas exploration, in particular to a method, system, storage medium and electronic equipment for optimizing nuclear magnetic resonance logging reservoir parameters. Background technique [0002] Nuclear magnetic resonance imaging technology, also known as magnetic resonance imaging, uses the principle of nuclear magnetic resonance to detect the emitted electromagnetic waves through an external gradient magnetic field. Based on this, it can be drawn into an image of the internal structure of the object. has been widely applied. [0003] As a special logging method, nuclear magnetic resonance logging is also a physical measurement of formation rocks like resistivity, radioactivity, and acoustic logging. The attenuated echo strings it collects are fluid relaxation signals in rock pores. Reaction. The pore fluid properties and physical properties required by geological res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/32G01V3/38G01R33/46
CPCG01V3/32G01V3/38G01R33/4625
Inventor 邹友龙刘秘李军胡松苏俊磊张军
Owner CHINA PETROLEUM & CHEM CORP
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