Digital shaft resistivity simulation method based on homogenized stratum electromagnetic field theory

Abstract

The invention provides a digital shaft resistivity simulation method based on a homogenized stratum electromagnetic field theory, and belongs to the technical field of well logging interpretation and evaluation. The method comprises the steps of: based on the multi-scale digital core, combining the multi-scale digital core with the electric imaging logging data and the stratum element logging data to construct a digital wellbore; for each voxel in the obtained digital wellbore, firstly calculating the conductivity of the mixture of the clay bound water and the free water in each voxel, then calculating the resistivity of the mixture of the apparent formation water and the skeleton in each voxel, determining the voxel conductivity, and finally calculating the conductivity of the mixture of each voxel layer by layer according to the depth to obtain the conductivity of the digital wellbore; and therefore, the digital wellbore resistivity simulation method based on the homogenized stratum electromagnetic field theory is achieved. The problem that an existing digital core is only limited to micro-scale research is effectively solved, meanwhile, a brand new thought is provided for resistivity upscaling simulation, the application range of the digital core is expanded, and high practicability is achieved.

Description

technical field [0001] The invention belongs to the technical field of well logging interpretation and evaluation, and relates to a digital wellbore resistivity simulation method based on the homogeneous formation electromagnetic field theory. Background technique [0002] Electrical logging is still a must-test item for oil and gas exploration. Resistivity is particularly important in the calculation of oil and gas saturation, identification of oil and gas reservoirs and calculation of reserves. The study of electrical characteristics of rocks is still a hot spot. Existing digital core technology mainly focuses on the study of micro-scale physical properties, ignoring the scale effect of digital cores in heterogeneous formations. Establishing large-scale digital wellbore models can better reflect the actual characteristics of formations. At present, the numerical simulation methods of digital core resistivity mainly include finite element method, Kirchhoff circuit node meth...

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Problems solved by technology

[0003] Aiming at the problems existing in the prior art, the present invention provides a digital wellbore resistivity simulation method based on the homogeneous formation electromagnetic field theory, which solves the technical problem of digital wellbore resistivity upscaling simulation, and provides a method for resistivity upscaling simulation new idea

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