Publicado

2015-07-01

Vertical and lateral variation of gas content associated with coal seams

Variación vertical y lateral del contenido de gas metano asociado a los mantos de carbón

Palabras clave:

Coal seam, ply, coal bed methane, vertical and lateral variation (en)
Mantos de carbón, ply, gas asociado, variación vertical y lateral (es)

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Autores/as

  • Luis D. Caro Universidad Nacional de Colombia - Sede Medellín
  • Astrid Blandón Universidad Nacional de Colombia - Sede Medellín
  • Jorge M. Molina Universidad Nacional de Colombia - Sede Medellín - Facultad de Minas

Vertical and lateral gas content variation associated within a coal seam and its relation to porosity and geology was researched. Several seams of high sub-bituminous and bituminous coal volatile C from Amaga formation were selected. Channel samples were taken and were subdivided into the different plies (lithotypes associations), performing proximal analysis; Petrographic (maceral counting and determining the vitrinite reflectance); furthermore desorption testing and porosity.

The higher gas content was in intermediate plies. It was possible to identify that the gas content, and micropores and mesopores has a direct relationship; also, there is a direct relationship between the content of liptinites macerals and gas content. In some cases, these relationships were not clear, since there is influence of geological factors such as the presence of faults favor migration and degassing of the mantles studied.

Se investigó la variación vertical y lateral del contenido de gas asociado dentro de un mismo manto de carbón y su relación a la porosidad y la geología. Varios mantos de carbón sub-bituminoso y bituminoso altos en volátiles C de la Formación Amagá fueron seleccionados. Se tomaron muestras de canal y fueron subdivididos en sus diferentes plies (asociaciones de litotipos), realizando análisis próximos completos; petrográficos (conteo maceral y determinación del poder reflector de la vitrinita); además pruebas de desorción y porosidad.

El mayor contenido de gas se presentó en los plies intermedios. Fue posible identificar que el contenido de gas en microporos y mesoporos tiene una relación directa; también existe una relación directa entre el contenido de macerales liptiniticos y el contenido de gas. En algunos casos estas relaciones no fueron claras, dado que allí hay influencia de factores geológicos, como la presencia de fallas favorecen la migración y desgasificación de los mantos estudiados.

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