Well logging with reduced usage of radioisotopic sources

G - Physics – 06 – N

Patent

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G06N 3/02 (2006.01) G01V 5/04 (2006.01)

Patent

CA 2604738

Logging systems and methods are disclosed to reduce usage of radioisotopic sources. Some embodiments comprise collecting at least one output log of a training well bore from measurements with a radioisotopic source; collecting at least one input log of the training well bore from measurements by a non- radioisotopic logging tool; training a neural network to predict the output log from the at least one input log; collecting at least one input log of a development well bore from measurements by the non-radioisotopic logging tool; and processing the at least one input log of the development well bore to synthesize at least one output log of the development well bore. The output logs may include formation density and neutron porosity logs.

L'invention concerne des systèmes et des procédés de diagraphie permettant de réduire l'usage de sources radioisotopiques. Certains modes de réalisation consistent à recueillir au moins un diagramme de sortie d'un puits de forage de perfectionnement à partir de mesures obtenues à l'aide d'une source radioisotopique, à recueillir au moins un diagramme d'entrée du puits de forage de perfectionnement à partir de mesures obtenues à l'aide d'un outil de diagraphie non radioisotopique, à fournir des données nécessaires à un réseau neuronal pour prédire le diagramme de sortie à partie dudit diagramme d'entrée, à recueillir au moins un diagramme d'entrée d'un puits de forage de développement à partir de mesures obtenues à l'aide de l'outil de diagraphie non radioisotopique, et à traiter ledit diagramme d'entrée du puits de développement pour synthétiser au moins un diagramme de sortie du puits de développement. Les diagrammes de sortie peuvent comprendre des diagrammes relatifs à la densité de formation et à la porosité-neutrons.

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