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Analysis method for rock induced polarization spectrum for solving permeability

A technology of induced polarization and permeability, which is applied in the field of rock induced polarization spectrum analysis to obtain permeability, can solve the problems of weak measurement attenuation, high logging cost, and low accuracy, and achieve large signal amplitude and low signal-to-noise The effect of high ratio and high precision

Inactive Publication Date: 2005-01-26
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0005] In order to overcome the shortcomings of the existing method of high logging cost, weak signal, large error, and low accuracy, the present invention provides a rock induced polarization spectrum analysis method for obtaining permeability. In this method, the constant current source passes through the control unit Supply power to the power supply electrode to make the core generate a polarization field, and then turn off the power, the polarization field gradually decays with time, and the measured attenuation is weak, perform multi-exponential attenuation inversion on the attenuation spectrum, obtain the relaxation time spectrum, and then calculate the relaxation time The geometric mean value and arithmetic mean value of , combined with the porosity logging data and experimental constants, calculate the permeability curve of the formation

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  • Analysis method for rock induced polarization spectrum for solving permeability
  • Analysis method for rock induced polarization spectrum for solving permeability
  • Analysis method for rock induced polarization spectrum for solving permeability

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Embodiment Construction

[0035] The present invention will be further described below in conjunction with accompanying drawing:

[0036] This method uses the excited polarization theory based on the electric double layer, that is, the rock particles in the deep liquid, especially the clay particles, attract the cations in the solution because of the excess negative ions, and form an electric double layer around them. When a constant external electric field is applied to both ends of the rock, the electric double layer will be deformed or the local concentration will be changed, that is, a polarized electric field will be generated. When the external electric field is removed, due to the diffusion potential, that is, the secondary field decay potential, This is the excited polarization potential.

[0037] Induced polarization logging technology can provide information such as reservoir permeability, formation water salinity, pore size and distribution by detecting the electrical relaxation characterist...

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Abstract

This invention relates to an induced polarization spectrum analysis method for acquiring penetration rate of rock. The characteristics are the following: to gather induced polarization weakening spectrum down-well and get induced polarization relax time spectrum through multiple index weakening match; then to calculate the geometric average and arithmetic average of relax time and ground penetration rate curve with materials of porosity logging and experiment constants. It is with low well logging cost, large signal range, high signal-to-noise ratio and long weakening time and high accuracy of polarization ratio measuring.

Description

Technical field: [0001] The invention relates to an induced polarization spectrum logging method and an interpretation method thereof, in particular to a rock induced polarization spectrum analysis method for obtaining permeability. Background technique: [0002] There are relatively mature logging techniques and interpretation methods for the measurement and evaluation of reservoir porosity, but in determining the permeability, the dominant factor determining the permeability is the reservoir pore structure, and the complexity of the pore structure is extremely serious. Due to the heterogeneity, the permeability logging technology and interpretation methods have not made much progress. At present, laboratory measurement and on-site NMR logging are mainly used. It is difficult to reproduce the formation conditions in the laboratory measurement, and the core will be produced during the coring process. Necessary cracks, these all cause great errors in the measurement of permea...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08G01N21/66
Inventor 童茂松王伟男姜亦忠范清华
Owner BC P INC CHINA NAT PETROLEUM CORP
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