Automatic core homing method and system based on sliding window method

Abstract

The invention provides a method and system for automatically homing rock cores based on the sliding window method. The method sequentially includes a preliminary depth matching step, a sliding window construction step, a correlation coefficient calculation step, and a screening step. The sliding window method is combined with logging data and The preliminary depth matching of the experimental data measured by the core and the calculation of the correlation coefficient between the two when the porosity parameter slides along the logging curve Carry out the intelligent calculation and processing of the core automatic homing to minimize the system gap between the cable depth and the drill pipe depth Error, in order to improve the calculation efficiency and accuracy of core homing.

Description

technical field [0001] The invention relates to the technical field of geological engineering, in particular to an automatic rock core homing method and system based on a sliding window method. Background technique [0002] The first-hand data for obtaining geological information in the field of geological engineering is the core data, which is the basis for logging reservoir evaluation, and the accuracy of the core data directly affects the follow-up scientific research work. In practical application, since the depth of the core and its experimental data is recorded by the depth of the drill pipe, and the logging data is recorded by the depth of the cable, the measurement system error is generated due to the difference in the compression coefficient of the cable and the drill pipe, resulting in the inconsistency of the core data. There is a systematic error in the depth, so before the analysis and research of the core data, the first task is to carry out the core homing, wh...

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Problems solved by technology

[0004] The present invention aims at the problems of slow speed and low accuracy caused by the similar method of artificial core porosity and log curve rhythm trend in the prior art. The present invention provides an automatic core homing method based on the sliding window method. Steps such as matching, building sliding windows and calculating correlation coefficients, using the sliding window method for automatic homing of cores, minimizing the systematic error between cable depth and drill pipe depth, so as to improve the calculation efficiency and accuracy of core homing

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