Open AccessNEURAL NETWORK INVERSION OF RESISTIVITY DATA FOR DETERMINATION OF DISTANCE TO A BED BOUNDARY
Author(s) -
Dmitry Kushnir,
Nikolay N. Velker,
D. V. Andornaya,
Yuriy Antonov
Publication year - 2021
Publication title -
interèkspo geo-sibirʹ
Language(s) - English
Resource type - Journals
ISSN - 2618-981X
DOI - 10.33764/2618-981x-2021-2-2-95-102
Subject(s) - inversion (geology) , artificial neural network , pointwise , electrical resistivity and conductivity , cascade , computer science , algorithm , synthetic data , boundary layer , artificial intelligence , data mining , pattern recognition (psychology) , geology , mathematics , engineering , mathematical analysis , aerospace engineering , paleontology , structural basin , chemical engineering , electrical engineering
Accurate real-time estimation of a distance to the nearest bed boundary simplifies the steering of directional wells. For estimation of that distance, we propose an approach of pointwise inversion of resistivity data using neural networks based on two-layer resistivity formation model. The model parameters are determined from the tool responses using a cascade of neural networks. The first network calculates the resistivity of the layer containing the tool measure point. The subsequent networks take as input the tool responses and the model parameters determined with the previous networks. All networks are trained on the same synthetic database. The samples of that database consist of the pairs of model parameters and corresponding noisy tool responses. The results of the proposed approach are close to the results of the general inversion algorithm based on the method of the most-probable parameter combination. At the same time, the performance of the proposed inversion is several orders faster.