Shale pore network and seepage simulation of Huai Hin Lat Formation
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Abstract
Gas shale is a type of petroleum rock associated with physical properties that simplify fluid migration pathways, necessary for the development of petroleum extraction and recovery in the region. Furthermore, it provides a carbon capture and storage (CCS) seal with low permeability and porosity. Shale porosity challenges the measurement of connected micropores. This study aims to investigate pore morphology, pore networks, and rock simulations of gas shale from Dat Fa sub-member of Huai Hin Lat Formation. The geochemical compositions were assessed using XRD and XRF techniques to identify the rock type. Scanning electron microscopy (SEM) analyzed the 2D pore morphology, distribution, and total porosity. X-ray tomographic microscopy generates pore network models that calculate total and effective porosity for seepage flow simulations, enhancing the analysis of gas transport mechanisms in rock formations. Geochemical analysis categorizes the rock types as calcareous shale and dolomitic shale. SEM images of calcareous shale typically reveal parallel flat pores and pinch-out along the laminations. Dolomitic shale exhibited the lamination of dolomite and calcite, with micropores surrounding mineral grains. The total porosity values for calcareous shale and dolomitic shale are 5.54% and 3.04%, respectively. Micro-CT image analysis revealed that the total porosity of calcareous shale ranged from 2.86% to 4.65%, while the effective porosity decreased down to 0.83% and 1.75%. The total porosity of dolomitic shale was estimated to range from 3.51% to 3.70%, with effective porosity ranging from 1.99% to 3.27%. Seepage simulations provide that calcareous shale has more diffusivity in parallel laminations, while dolomitic shale demonstrates greater diffusivity in perpendicular laminations.
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Copyright © 2008 Department of Geology, Faculty of Science, Chulalongkorn University. Parts of an article can be photocopied or reproduced without prior written permission from the author(s), but due acknowledgments should be stated or cited accordingly.
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