MULTISCALE ANALYSIS OF CYCLICITIES IN WELL LOGS FROM THE WAVELET TRANSFORM, APPLIED TO CAMPO COLORADO
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Universidad Industrial de Santander
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Este artículo muestra la aplicación de la herramienta matemática de la transformada de ondícula para el análisis de registros de Rayos Gamma (GR) y Resistivos (ILD), en los pozos C54, C56, C63, C65, C66 y C68 del campo Colorado, ubicado en la Cuenca del Valle Medio del Magdalena (Colombia). Los registros fueron procesados a través de la herramienta de la transformada de ondícula en el Wavelet Toolbox de MATLAB 7.1. Con esta herramienta se obtuvieron 12 escalogramas que permitieron corroborar los topes estratigráficos de las (Zonas B1-B2) y la Zona C de la Formación Mugrosa. Los topes fueron establecidos por la presencia de señales de alta intensidad en los escalogramas. Con la transformada de ondícula discreta se realizó un análisis multi-resolución de registros de Rayos Gamma (GR) en la Zona B de la Formación Mugrosa para los pozos C63, C65, C66 y C68. En los pozos C63, C65 y C68 se encontró que la relación 1:2 muestra las periodicidades de precesión 20 ka y oblicuidad 41 ka de los ciclos de Milankovitch. Sin embargo, la ausencia de una descripción sedimentológica detallada no permite mostrar la relación de estas ciclicidades con el modelo sedimentario para cada pozo. Estas periodicidades se relacionaron con las electroformas de canal y llanura de inundación definidas en el modelo sedimentológico y estratigráfico de Campo Colorado.
This paper shows the application of the mathematical tool wavelet transform to the analysis of Gamma Ray (GR) and Resistivity (ILD) logs from the C54, C56, C63, C65, C66 and C68 wells of campo Colorado, located in the Middle Magdalena Basin (Colombia). Records were processed through the tool wavelet transform in the Wavelet Toolbox from MATLAB 7.1. With this tool, 12 scalograms were obtained, which allowed corroborating stratigraphic tops of the Zones B1-B2 and the Zone C of the Mugrosa Formation. Tops were established by the presence of high intensity signals in scalograms. With the discrete wavelet transform the multiresolution analysis of logs GR was realized in the Zone B of the Mugrosa Formation from C63, C65, C66 and C68 wells. In the wells C63, C65 and C68 it was found that the relation 1:2 showed the periodicities of 20 ka precessions and 41 ka obliquity from Milankovitch cycles. However, the absence of detailed sedimentological description does not let showing the relationship of these cyclicities with the sedimentary model for each well. These periodicities are related with electroforms channel and flood plain defined sedimentological and stratigraphic model of campo Colorado.
This paper shows the application of the mathematical tool wavelet transform to the analysis of Gamma Ray (GR) and Resistivity (ILD) logs from the C54, C56, C63, C65, C66 and C68 wells of campo Colorado, located in the Middle Magdalena Basin (Colombia). Records were processed through the tool wavelet transform in the Wavelet Toolbox from MATLAB 7.1. With this tool, 12 scalograms were obtained, which allowed corroborating stratigraphic tops of the Zones B1-B2 and the Zone C of the Mugrosa Formation. Tops were established by the presence of high intensity signals in scalograms. With the discrete wavelet transform the multiresolution analysis of logs GR was realized in the Zone B of the Mugrosa Formation from C63, C65, C66 and C68 wells. In the wells C63, C65 and C68 it was found that the relation 1:2 showed the periodicities of 20 ka precessions and 41 ka obliquity from Milankovitch cycles. However, the absence of detailed sedimentological description does not let showing the relationship of these cyclicities with the sedimentary model for each well. These periodicities are related with electroforms channel and flood plain defined sedimentological and stratigraphic model of campo Colorado.
Keywords
wavelet transform, scalograms, stratigraphic tops, multiresolution analysis, Mugrosa Formation, transformada de ondícula, escalogramas, topes estratigráficos, análisis multi-resolución, Formación Mugrosa