Inclined-well dual laterolog curve correction method

Abstract

The invention discloses an inclined-well dual laterolog curve correction method. The method includes the steps: S1, building an inclined-well dual laterolog forward model; S2, performing forward simulation to determine stratum dip angle and thickness threshold of a target stratum; S3, according to measured dual laterolog data, integrating natural gamma ray logging, imaging and dip logging data for stratum stratification and stratum dip angle determination, and combining with forward result to determine whether data correction needs to be performed or not; S4, if yes, extracting resistivity representative value of the target stratum according to stratification result, and constantly updating stratum resistivity model parameters to enable an error between a dual laterolog value and a measure logging value at a central point of a reconstructed stratum; S5, utilizing a stratum reflectivity value to perform forward simulation of dual laterolog response under straight well condition, adding other environmental influencing factors, and acquiring a dual laterolog curve under the straight well condition. The method is conducive to solving the problem of electric logging based on dual laterolog data and under inclined well condition.

Description

technical field [0001] The invention relates to a method for correcting well logging data, in particular to a method for correcting double laterolog curves of deviated wells, belonging to the field of petroleum exploration and development. Background technique [0002] With the continuous improvement of exploration and development technology, inclined wells (including inclined vertical wells and directional wells) are more and more widely used. In the process of logging in deviated wells, due to the influence of the inclination angle, the curve distortion is caused, especially the amplitude and shape of the electrical logging tool curves in deviated wells are very different from those in straight wells. Electrical logging curves must be specially corrected to be effectively applicable to conventional lithology analysis and logging evaluation. [0003] At present, the correction method of dual laterolog curves in deviated wells is mainly the calibration chart method, which i...

AI Technical Summary

Problems solved by technology

However, there are still the following problems in practical application: 1) The preparation of the dual laterolog correction chart is complicated, and it only considers the case where the resistivity of the surrounding rocks on both sides is equal; 2) The dual laterolog response chart is different under different regional conditions , which has a strong regional dependence

[0004] At the same time, the electrical logging inversion technology can also be used to correct the electrical logging data of deviated wells, but the existing electrical logging inversion technology is usually used in two-dimensional situations, and does not consider the three-dimensional numerical inversion under deviated well conditions, and In 2D inversion, it is necessary to reconstruct the forward logging curve, which greatly reduces the speed of inversion

[0005] Therefore, the current correction method for dual laterolog data in deviated wells is not suitable for actual production applications, and a method for correcting dual laterolog curves that is consistent with actual deviated wells is urgently needed

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