Gradient formation resistivity logging response calculation method and device
A technology of resistivity logging and calculation method, which is applied in earthwork drilling, wellbore/well components, etc., can solve the problems of inaccurate logging response results and uneven radial distribution of physical parameters.
Active Publication Date: 2018-10-12
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 following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0061] like figure 1 As shown, the 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 invasion function with a transition zone index of 2 and a resistivity exponential invasion function with a transition zone index of 2.
[0063] Step 102, the conductivity contained in the A, B, G and H matrix elements of the numerica...
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The invention provides a gradient formation resistivity logging response calculation method and device and relates to the technical field of formation resistivity logging response. The gradient formation resistivity logging response calculation method comprises the steps that conductivities contained in a matrix element A, a matrix element B, a matrix element G and a matrix element H in a numerical mode matching method in formation resistivity logging response are replaced through a conductivity index invasion function with the transitional zone index being 2, and the matrix elements are further calculated through an analytic expression, wherein the conductivity index invasion function is used for describing variation of the gradient formation resistivity; reciprocals of the conductivitiescontained in the matrix element A, the matrix element B, the matrix element G and the matrix element H of the numerical mode matching method in formation resistivity logging response are replaced through a resistivity index invasion function with the transitional zone index being 2, and the matrix elements are further calculated through the analytic expression, wherein the resistivity index invasion function is a reciprocal of the conductivity index invasion function. Thus, the problems that as for a radial gradient formation, the logging response result of an existing numerical mode matchingmethod is inaccurate and low in speed are solved.
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 gradually changing formations. Background technique [0002] Resistivity logging is the basic method to detect oil and gas distribution in complex formations. Its basic principle is to send signals to the formation through the instrument’s transmitting probe, and the receiving probe receives the signal that the transmitted signal flows back through the formation. Since the instrument passes through different formations when moving along the wellbore, it will As a result, the signals received by the measuring probes are different. Further, the oil and gas distribution in complex formations can be determined by converting the measured signals into apparent resistivity according to the characteristics of the instrument, and then performing inversion and interpretation. However, the...
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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