Method of Extracting Parameters from Measurement Data of Acoustoelectric Effect Downhole Detector

Abstract

The invention discloses a method for extracting parameters from acoustoelectric effect underground detector measurement data. The method for extracting parameters from the acoustoelectric effect underground detector measurement data comprises the following steps of calculating an energy ratio of an intrinsic wave and an accompany converted wave at every predetermined depth of a plurality of predetermined depths, performing normalization processing on the energy ratios of the intrinsic waves and the accompany converted waves and obtaining a first normalization ratio curve which changes along with depth within a target well section range; calculating an energy ratio of an interface converted wave and an intrinsic wave at every predetermined depth of a plurality of predetermined depths, performing normalization processing on the energy ratios between the interface converted waves and the intrinsic waves and obtaining a second normalization ratio curve which changes along with depth within a target well section range; simultaneously solving a coupled acoustic-electromagnetic coefficient curve according to the first normalization ratio curve and the second normalization ratio curve; evaluating the in-place permeability according to the coupled acoustic-electromagnetic coefficient curve in combination with log data. The method for extracting parameters from the acoustoelectric effect underground detector measurement data solves the problem that majority logging method cannot directly evaluate the in-place permeability.

Description

technical field [0001] The invention relates to the field of applied geophysics, in particular to a method for extracting parameters from the measurement data of an acoustic-electric effect downhole detector. Background technique [0002] Theoretical and experimental studies have proved that the oil-water interface can be distinguished by using the acoustic-electric effect, the geological parameters related to the reservoir can be detected, and the fracture zone and formation structure characteristics can also be detected. Acoustoelectric logging can be directly applied to detect formation properties related to pore fluids, such as conductivity, porosity, viscosity, ion concentration, and permeability, etc., especially to solve the problem that most logging methods cannot directly detect formation permeability. question. In addition, elastic waves can also cause acoustic and electric effects when propagating in fractures. Acoustic and electric logging will provide more frac...

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Problems solved by technology

[0004] The present invention provides a method for extracting parameters from the measurement data of an acoustic-electric effect downhole detector, to at least solve the problem that the prior art cannot provide an effective method for the extraction of key parameters in the actual acoustic-electric effect downhole detector measurement data processing, and then The problem that the formation permeability cannot be directly evaluated

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