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Glutenite reservoir oil saturation calculation method based on nuclear magnetic resonance

A nuclear magnetic resonance and saturation technology, which is applied in the direction of earthwork drilling and production, wellbore/well components, etc., can solve the problem of not considering the universal relationship, which is not conducive to the establishment of high-precision saturation models, and the inability to accurately calculate the saturation of complex oil and gas reservoirs degree and other issues, to achieve the effect of accurate oil saturation

Active Publication Date: 2015-03-25
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

However, the universal relationship between the variable m value, n value and pore structure is not considered, which is not conducive to the establishment of a high-precision saturation model, and it is impossible to accurately calculate the saturation of complex oil and gas reservoirs

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  • Glutenite reservoir oil saturation calculation method based on nuclear magnetic resonance
  • Glutenite reservoir oil saturation calculation method based on nuclear magnetic resonance
  • Glutenite reservoir oil saturation calculation method based on nuclear magnetic resonance

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Embodiment Construction

[0038] The specific implementation manners provided by the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0039] see figure 1 , a method for calculating the oil saturation of a glutenite reservoir based on nuclear magnetic resonance provided by an embodiment of the present invention includes the following steps:

[0040] Step 101: Select different glutenite cores with different lithologies and pore structures, conduct petrophysical experiments, and measure core porosity Φ, cementation index m, saturation index n, and NMR T 2 Spectrum;

[0041] Step 102: Extract NMR T 2 The spectrum reflects the characteristic parameters of the pore structure;

[0042] Step 103: Using the correlation between the cementation index m, the saturation index n and the characteristic parameters of the pore structure, establish the NMR-based T 2 Spectrum saturation interpretation model;

[0043] Step 104: By NMR T 2 Calculate the ceme...

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Abstract

The invention discloses a glutenite reservoir oil saturation calculation method based on nuclear magnetic resonance. The method includes the steps that glutenite cores of different lithological characters and pore structures are selected, and the porosity phi, the cementation index m, the saturation index n and the nuclear magnetic T2 spectrum of the glutenite cores are measured; the nuclear magnetic T2 spectrum is extracted to reflect the character parameters of the pore structures; through correlation among the cementation index m, the saturation index n and the character parameters of the pore structures, a saturation interpretation model based on the nuclear magnetic T2 spectrum is built; the cementation index m and the saturation index n of a reservoir are calculated through the nuclear magnetic T2 spectrum; the cementation index m and the saturation index n are substituted into the saturation interpretation model to obtain the oil saturation So through calculation. By means of the glutenite reservoir oil saturation calculation method, the quantitative, continuous and highly accurate cementation index m and the saturation index n can be obtained through nuclear magnetic resonance logging data under the condition that no laboratory rock electrical data exist, and the calculated oil saturation is made to be more accurate.

Description

technical field [0001] The invention relates to the technical field of well logging evaluation of complex oil and gas reservoirs in petroleum exploration, in particular to a nuclear magnetic resonance-based oil saturation calculation method in the logging evaluation of glutenite reservoirs with low porosity and low permeability. Background technique [0002] Reservoir oil saturation is an important parameter for reservoir evaluation, and accurate calculation of reservoir oil saturation is one of the important tasks of logging interpretation and evaluation. The commonly used quantitative evaluation method for oil and gas reservoir saturation is established according to the classic Archie formula: [0003] S w = ( abR w φ m R ...

Claims

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Application Information

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IPC IPC(8): E21B49/00
CPCE21B49/00
Inventor 李国利孙宝佃单沙沙万金彬高衍武吴伟肖华胡婷婷范小秦陈国军王长江白松涛
Owner BC P INC CHINA NAT PETROLEUM CORP
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