A method and a device for intelligently optimizing electrode system structure parameters of a resistivity logging instrument

Abstract

The invention relates to the field of resistivity logging, and discloses a method and a device for intelligently optimizing electrode system structure parameters of a resistivity logging instrument. The method comprises the following steps: acquiring a plurality of input factors influencing electrode system structure parameters of the resistivity logging instrument; according to the multiple objective functions corresponding to the multiple factors, carrying out summation by using a preset weight to obtain an overall objective function of a plurality of instrument models which can be constructed through an algorithm and are composed of electrode system structure parameter groups; constructing and calculating an overall objective function according to an algorithm, and performing adaptive adjustment on the weights of the multiple objective functions to enable the influences of the disturbance of the multiple objective functions on the overall objective function to be equal; Output of optimization results. According to the method, an optimization effect sheet caused by factors which have very small objective function values but have the same important influence on electrode system structure parameter optimization of the resistivity logging instrument can be prevented from being covered by too large objective function values, so that an optimization effect which has more comprehensive influence on the electrode system structure parameters of the resistivity logging instrument is obtained.

Description

technical field [0001] The invention relates to the field of resistivity logging, in particular to a method and device for intelligently optimizing structural parameters of an electrode system of a resistivity logging instrument. Background technique [0002] Under the condition of low-resistivity mud, resistivity logging is an important method to detect the resistivity of oil and gas reservoirs, such as dual lateral resistivity logging tools, array lateral resistivity logging tools, array azimuth resistivity logging tools, etc. . The electrode system structure parameters such as the electrode structure and interval size of the resistivity logging tool determine the detection characteristics of the instrument. It is closer to the true value of formation resistivity; on the other hand, the instrument can provide a variety of detection modes, and different detection modes have uniform radial distribution of detection depth, which can more clearly reflect the formation invasio...

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Problems solved by technology

[0003] However, in the optimization of the electrode system parameters of the resistivity logging tool in the prior art, multiple objective functions are established according to the main factors affecting the characteristics of the resistivity logging tool. The speed and the expansion of its calculation scale make the calculation efficiency not high; it also does not take into account that some objective function values ​​are too large, which will cover up some objective function values ​​that are small but have an equally important influence on the electrode system structural parameters of the resistivity logging tool. Factors, the influence of some factors with small objective function values ​​cannot be reflected in the optimization results to match their importance, making the optimization results one-sided; and the current ratio of the main electrode to the shielding electrode of the instrument is not controlled in the prior art , so that the optimized instrument cannot work under the condition of high resistivity formation due to the low main electrode-shielding electrode current ratio

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