Fibrous calcite characteristics and petroleum potential source rock of Permian carbonate, central Thailand
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Abstract
The outcrop samples of the Permian carbonate in Phetchabun, central Thailand have been studied to determine the characteristics and the occurrence of bedding-parallel calcite fibrous veins. Field occurrence, petrographic study, and geochemical investigations are conducted to interpret the formation mechanism of the veins and to assess petroleum potential in two Permian carbonate rock localities, including Khao Khwang and Nam Duk Formations. Total organic carbon (TOC) and extractable organic matter (EOM) analysis are performed in order to evaluate source rock potential of the samples and pyrolysis. The bedding-parallel fibrous calcite vein is divided into two forms, including beef veins and cone-in-cone structure. Both characters present adjacent parallel growing of fibrous calcite veins to host rock bedding and they are approximately perpendicular to the bedding based on petrography. As the total organic carbon (TOC), extractable organic matter (EOM), and pyrolysis analyses conclude that both the Khao Khwang and the Nam Duk Formations have a capacity to produce hydrocarbons which are mainly gas-types as a dry gas prone source rock.
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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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