Method, device and equipment for determining reservoir permeability based on nuclear magnetic resonance data

A nuclear magnetic resonance and data determination technology, applied in the field of oil and gas exploration, can solve problems such as inapplicability

Active Publication Date: 2021-09-10
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Claims
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Problems solved by technology

Commonly used models for obtaining reservoir permeability based on NMR logging are the Coates model and the SDR model, but a large number of core experiment data show that they are not suitable for reservoirs with complex pore structures

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  • Method, device and equipment for determining reservoir permeability based on nuclear magnetic resonance data
  • Method, device and equipment for determining reservoir permeability based on nuclear magnetic resonance data
  • Method, device and equipment for determining reservoir permeability based on nuclear magnetic resonance data

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Embodiment Construction

[0064] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described The embodiments are only some of the embodiments in this specification, not all of the embodiments. Based on the implementations in this specification, all other implementations obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of this specification.

[0065] The existing schemes for determining reservoir permeability do not consider the heterogeneity of reservoir space. Therefore, the accuracy of reservoir permeability evaluation for tight oil and gas and unconventional oil and gas needs to be improved. In fact, the pore structure of unconventional oil and gas reservoirs is complex, and it...

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Abstract

Embodiments of the present specification provide a method, device, and device for determining reservoir permeability based on nuclear magnetic resonance data, the method comprising: acquiring permeability, porosity, and nuclear magnetic resonance echo trains of reservoir rock samples; Inverting the resonant echo train to obtain the nuclear magnetic resonance T2 distribution of the reservoir rock sample; determining the single fractal dimension feature and multifractal dimension feature of the nuclear magnetic resonance T2 distribution; according to the single fractal dimension feature, The multifractal dimension feature, the porosity and the permeability generate a reservoir permeability prediction model; the reservoir permeability of the work area corresponding to the reservoir rock sample is predicted according to the reservoir permeability prediction model. The embodiments of the present specification can improve the permeability prediction accuracy of complex pore structure reservoirs.

Description

technical field [0001] This description relates to the technical field of oil and gas exploration, in particular to a method, device and equipment for determining reservoir permeability based on nuclear magnetic resonance data. Background technique [0002] Permeability is an important parameter reflecting the seepage ability of reservoir fluid in rock pores. Permeability evaluation is of great significance for reservoir classification, productivity prediction and reservoir modeling. [0003] At present, the regional empirical formula for calculating permeability is usually established by using the statistical relationship of parameters such as core analysis permeability and porosity. However, this method is not suitable for the calculation of the permeability of reservoirs with complex pore structures (such as ultra-low permeability reservoirs, etc.). NMR logging can obtain information such as reservoir porosity and pore size distribution, and has unique advantages in eva...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N24/08G01N15/08
CPCG01N15/08G01N15/088G01N24/081
Inventor 谢然红刘秘
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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