Calculation method and device for resistivity logging response of graded formation
A technology of resistivity logging and calculation method, which is applied in the direction of earthwork drilling and production, wellbore/well components, etc., can solve the problems of inaccurate logging response results, uneven radial distribution of physical parameters, etc., and avoid simple approximation, The effect of increasing calculation speed and improving calculation accuracy
Active Publication Date: 2022-03-01
PETROCHINA CO LTD +2
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[0017] Embodiments of the present invention provide a method and device for calculating the resistivity logging response of gradually changing formations to solve the problem that due to the uneven radial distribution of the physical parameters of the actual formations, for radially changing formations, the existing numerical pattern matching method The problem of inaccurate logging response results
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[0060] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0061] like figure 1 As shown, an embodiment of the present invention provides a method for calculating the resistivity logging response of a graded formation, including:
[0062] Step 101 , generating a conductivity exponential intrusion function with a transition zone index of 2 and a resistivity exponential intrusion function with a transition zone index of 2.
[0063] Step 102 , replace the conductivity included in the matrix ele...
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The invention provides a method and device for calculating the resistivity logging response of a gradually changing formation, and relates to the technical field of the resistivity logging response of the formation. The method includes: replacing the conductivity contained in the A, B, G and H matrix elements of the numerical pattern matching method in the resistivity logging response of the formation with a conductivity index invasion function with a transition zone index of 2, and further analyzing Expressions compute matrix elements; Conductivity Exponential Intrusion function is used to describe changes in conductivity of graded formations; Conductivities included in A, B, G, and H matrix elements of numerical pattern matching method in resistivity log response to formations The reciprocal is replaced by the resistivity exponential invasion function whose transition zone index is 2, and the matrix elements are further calculated by analytical expressions; the resistivity exponential invasion function is the reciprocal of the conductivity exponential invasion function. In this way, the problems of inaccurate logging response and slow speed of the existing numerical pattern matching method are solved for radially graded formations.
Description
technical field [0001] The invention relates to the technical field of formation resistivity logging response, in particular to a method and device for calculating the resistivity logging response of a graded formation. Background technique [0002] Resistivity logging is a basic method to detect oil and gas distribution in complex formations. Its basic principle is to transmit signals to the formation through the transmitter probe of the instrument, and the receiver probe to receive the transmitted signal and return the signal through the formation. As a result, the signals received by the measuring probes are different. Further, the measured signals are converted into apparent resistivity according to the characteristics of the instrument, and then inversion and interpretation are performed to determine the oil and gas distribution in complex formations. However, inversion of logging signals requires massive forward calculation, which requires a fast and high-precision for...
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IPC IPC(8): E21B49/00
CPCE21B49/00
Inventor 唐章宏程文娟许月晨熊焱春代明忠唐宇田园诗刘刚宋永杨
Owner PETROCHINA CO LTD