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Burial history and the evolution of hydrocarbon generation in Carboniferous-Permian coal measures within the Jiyang super-depression, China
Registro de enterramiento de carbones del Carbonífero-Pérmico y su impacto en la generación secundaria de hidrocarburos en la subcuenca de Jiyang, China
DOI:
https://doi.org/10.15446/esrj.v24n4.63220Keywords:
Burial history, Hydrocarbon-generating evolution, C-P coal measures, Carboniferous-Permian, Jiyang super-depression (en)registro de enterramiento, Carbonífero-Pérmico, subcuenca Jiyang, evolución de desarrollo, generación secundaria de hidrocarburos (es)
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In the Jiyang Sub-basin, Carboniferous-Permian (C-P) coal-measure source rocks have experienced complex multi-stage tectonics and therefore have a complex history of hydrocarbon generation. Because these coal measures underwent multi-stage burial and exhumation, they are characterized by various burial depths. In this study, we used the basin modeling technique to analyze the relationship between burial history and hydrocarbon generation evolution. The burial, thermal and maturity histories of C-P coals were reconstructed, including primary hydrocarbon generation, stagnation, re-initiation, and peak secondary hydrocarbon generation. The secondary hydrocarbon generation stage within this reconstruction was characterized by discontinuous generation and geographical differences in maturity due to the coupled effects of depth and a delay of hydrocarbon generation. According to the maturity history and the delay effect on secondary hydrocarbon generation, we concluded that the threshold depth of secondary hydrocarbon generation in the Jiyang Sub-basin occurred at 2,100 m during the Yanshan epoch (from 205 Ma to 65 Ma) and at 3,200 m during the Himalayan period (from 65 Ma to present). Based on depth, residual thickness, maturity, and hydrocarbon-generating intensity, five favorable areas of secondary hydrocarbon generation in the Jiyang Sub-basin were identified, including the Chexi areas, Gubei-Luojia areas, Yangxin areas, the southern slope of the Huimin depression and southwest of the Dongying depression. The maximum VRo/burial depth (%/km) occurred in the Indosinian epoch as the maximum VRo/time (%/100Ma) happened in the Himalayan period, indicating that the coupling controls of temperature and subsidence rate on maturation evolution play a significant role in the hydrocarbon generation evolution. A higher temperature and subsidence rate can both enhance the hydrocarbon generation evolution.
En la subcuenca de Jiyang, rocas madre del Carbonífero tardío y del Pérmico temprano (C-P) han experimentado multifases tectónicas complejas que además tienen una historia de generación de hidrocarburos. Debido a que estas rocas estuvieron sometidas a un enterramiento multifásico y a exhumación, estas se caracterizan por una variedad de profundidades de enterramiento. En este estudio se usó la técnica de modelado de cuenca para analizar la relación entre la historia de enterramiento y la evolución de generación de hidrocarburos. Se reconstruyeron el enterramiento y los registros termal y de desarrollo de las rocas fuente, incluida la generación de hidrocarburos primarios, el estancamiento, el reinicio, y el pico secundario de la generación de hidrocarburos. La fase secundaria de generación de hidrocarburos en esta reconstrucción se caracterizó por la generación discontinua y las diferencias geográficas de desarrollo debido a los efectos acoplados de profundidad y un retraso en la generación de hidrocarburos. De acuerdo con el registro de desarrollo y el efecto de retraso en la segunda fase de generación de hidrocarburos, se concluyo que el umbral de profundidad de esta fase en la subcuenca Jiyang ocurre a 2100 metros durante la época Yanshan (de 205 Ma a 65 Ma) y a 3200 metros durante la época Himalaya (de 65 Ma al presente). Con base en la profundidad, el grosor residual, el desarrollo y la intensidad de generación de hidrocarburos, se identificaron cinco áreas favorables de la segunda fase de generación en la subcuenca Jiyang, que incluye las áreas de Chexi, Gubei-Luojia, y Yangxin, la pendiente al sur de la depresión de Huimin y el suroccidente de la depresión de Dongying. La profundidad máxima VRo/enterramiento (%/km) ocurrió en la época Indosina, mientras que el máximo VRo/tiempo (%/100 Ma) ocurrió en la época del Himalaya, lo que indica que el acoplamiento de controles de temperatura e índice de subsidencia en la evolución del desarrollo juegan un rol significante en la evolución de generación de hidrocarburos. Una mayor temperatura y un mayor índice de subsidencia pueden mejorar la evolución de generación de hidrocarburos.
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