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A multi-well complex lithology intelligent identification method and system based on logging data

A technology of well logging data and complex lithology, applied in borehole/well parts, character and pattern recognition, measurement, etc., can solve the problems of high cost of coring, low accuracy of lithology identification results, single characteristic logging curve, etc. problem, to achieve the effect of improving speed and accuracy

Inactive Publication Date: 2019-06-21
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

[0003] The present invention provides a method based on well logging data to solve the defects in the prior art that the cost of coring in the whole area is too high, the identification of lithology in the whole area is difficult, and the characteristic logging curve is too single, which leads to the low accuracy of lithology identification results. Multi-well complex lithology intelligent identification method, which reasonably and effectively introduces technical principles such as artificial intelligence machine learning training, intelligent analysis and comparison, and automatic prediction results based on models, to efficiently, quickly and reliably complete the intelligent identification of multi-well complex lithology in the whole area. identification, greatly improving the speed and accuracy of lithology identification

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  • A multi-well complex lithology intelligent identification method and system based on logging data
  • A multi-well complex lithology intelligent identification method and system based on logging data

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Embodiment Construction

[0033] The invention relates to an intelligent identification method of multi-well complex lithology based on well logging data. Firstly, the target well logging data file is determined and the format conversion and normalization preprocessing are performed, and then according to the key core wells in the whole area in the core well Based on the known lithology of each key core well, the log curve data of each key core well is screened and / or feature combination expanded to obtain the log curve data sensitive to lithology, and then according to the known lithology of the core well section, the The logging curve data sensitive to lithological response is tagged and calibrated to form a sample database. At the same time, the unlabeled logging curve data of other wells in the whole area except key core wells are used to form a database to be tested, and then the data in the sample database is used to Combine several machine learning algorithms for machine learning training and aut...

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Abstract

The invention relates to a multi-well complex lithology intelligent identification method and system based on logging data. The method comprises the following steps: firstly, determining a target logging data file and carrying out format conversion and normalization preprocessing; performing feature screening and / or feature combination expansion on the logging curve data according to the known lithology of the key coring well in the whole region in the coring well section to obtain the logging curve data sensitive to the lithology; performing labeling calibration on the logging curve data sensitive to the lithology response to form a sample database, and forming a to-be-tested database by using the logging curve data which are not labeled in the whole region; utilizing data of the sample databaseto carry out machine learning training by combining a plurality of machine learning algorithms, and then automatically establishing a plurality of lithology recognition models. An optimal modelis selected through a classification performance evaluation rule, the optimal model is used for carrying out lithology prediction on the data in the database to be tested so as to realize intelligentidentification of multi-well complex lithology in the whole region, and the method is efficient, convenient, applicable in the whole region and very accurate in automatic intelligent prediction result.

Description

technical field [0001] The invention relates to the technical field of geological engineering lithology identification, in particular to an intelligent identification method and system for multi-well complex lithology based on logging data. Background technique [0002] Lithology identification has always been a key analysis problem in geological engineering research, and for reservoir description, the most basic problem is to solve the lithology problem of multiple wells in the work area. Lithology identification in the prior art mainly includes geological research method, intersection map method, and lithology identification using mathematical algorithms. The lithology of the cored section can be obtained by observing the cored samples for analysis, but the cost of coring is high and difficult, and the prior art for lithology identification is only a single key well, each time only A very small number of cores can be taken, which means that the lithology data of most well...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/62E21B47/00
Inventor 魏周城王志章王如意裴升杰杨笑王伟方夏小健李冰涛雷祥辉
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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