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Low-permeability sandstone reservoir pore structure quantitative inversion method based on nuclear magnetic resonance

A pore structure, nuclear magnetic resonance technology, applied in permeability/surface area analysis, measurement device, suspension and porous material analysis, etc., can solve the problem of not taking into account the maximum mercury saturation problem

Inactive Publication Date: 2015-08-05
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

[0032] Method 1 is an improvement to Method 2. Different power functions are used to construct pseudo-capillary pressure curves, and the agreement with the capillary pressure curves obtained by mercury intrusion has improved to some extent compared with the previous ones. 2 It is obtained by integrating the spectrum, and its maximum saturation is 100%, which does not take into account the problem of maximum mercury saturation, which has certain limitations

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  • Low-permeability sandstone reservoir pore structure quantitative inversion method based on nuclear magnetic resonance
  • Low-permeability sandstone reservoir pore structure quantitative inversion method based on nuclear magnetic resonance
  • Low-permeability sandstone reservoir pore structure quantitative inversion method based on nuclear magnetic resonance

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[0114] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0115] A nuclear magnetic resonance-based quantitative inversion method for the pore structure of low-permeability sandstone reservoirs, comprising the following steps:

[0116] The first step is to select the basic sample, the basis for the selection of the basic sample:

[0117] a. The sample needs to use the data of the supporting nuclear magnetic experiment and mercury intrusion experiment,

[0118] b. The samples must be conventional logging information,

[0119] c. Samples include different pore structure types;

[0120] The second step is to classify the pore structure types of low-permeability sandstone reservoirs based on the mercury injection data:

[0121] Due to the complex pore structure of low-permeability sandstone, the characteristics...

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Abstract

The invention discloses a low-permeability sandstone reservoir pore structure quantitative inversion method based on nuclear magnetic resonance. The method comprises the following steps: I, selecting a basic sample; II, classifying the type of a pore structure; III, establishing a well logging chart for identifying the pore structure; IV, establishing a pore throat distribution inversion formula according to the type of the pore structure; V, verifying the accuracy of the formula; VI, identifying the type of the pore structure of a shaft section by utilizing the well logging chart; VII, quantitatively inverting the distribution of free fluid pore throats by utilizing a nuclear magnetic resonance well logging T2 spectrum. The method has the following beneficial effects: a reliable method and technology are provided for quantitatively evaluating the pore structure, and the research concept of the current method can be broken through. The continuous free fluid pore throat distribution can be inverted by virtue of the nuclear magnetic resonance well logging, so that direct evidence is provided for evaluating the effectiveness of the low-permeability sandstone reservoir, application of the well logging information in the quantitative inversion of the micro pore structure of the reservoir is favorably explored, and the application and development of the nuclear magnetic well logging technology can be promoted.

Description

technical field [0001] The invention relates to the fields of core nuclear magnetic resonance, mercury injection experiment and nuclear magnetic resonance logging, in particular to a quantitative inversion method for the pore structure of low-permeability sandstone reservoirs based on nuclear magnetic resonance. Background technique [0002] NMR is based on the interaction of the magnetic properties of atomic nuclei and their applied magnetic fields. Under the action of an external magnetic field, the protons in the formation fluid are polarized, and the spatial orientation of nuclear spins changes from disorder to order. After polarization, turn off the external magnetic field, and measure the time (relaxation time) of the spin system from the unbalanced state to the balanced state, that is, measure the longitudinal relaxation time T 1 , the transverse relaxation time T 2 . [0003] The original data of magnetic resonance logging is the spin echo train that decays with t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
Inventor 闫建平温丹妮李尊芝耿斌何旭贾将张帆崔宇诗
Owner SOUTHWEST PETROLEUM UNIV
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