Research articles
ScienceAsia 46S (2020):ID 102-109 |doi:
10.2306/scienceasia1513-1874.2020.S015
Organic geochemical characteristics of Mae Teep coal
deposits, Thailand
Patthapong Chaiseanwanga, Piyaphong Chenraia,b,*
ABSTRACT: The organic geochemical data presented for sixteen rock samples including nine coals, five shales and two
mudstones from Mae Teep coal mine located in Lampang province. The total organic carbon (TOC) content of the coal
samples ranges from 30.12-73.71 wt.% whereas shale and mudstone values range between 4.81 and 19.49 wt.%. The
extractable organic matter (EOM) of all studied samples, which is yielded from bitumen extraction, values between
313.3-9764 ppm representing good to excellent hydrocarbon-generation potential. The thermal maturity and organic
matter type of the samples were determined from organic geochemical data. The thermal maturity of the samples
is consistent with their being of immature stage. Gas chromatograms obtained from the samples are dominated by
long chain n-alkanes and high Carbon Preference Index (CPI replica watches) values, indicating terrestrial organic matter input. The
biomarker parameters obtained from mass spectrometer data on m/z 191 and m/z 217 indicate that the depositional
environments are divided into three main environments: (1) coal seams are deposited in aquatic terrestrial environment
under relatively oxic condition; (2) oil shale are deposited in aquatic terrestrial environment under relatively anoxic
condition and; (3) mudstones are interpreted to be organic-lean sediment supply in terrestrial environment.
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| a |
Basin Analysis and Structural Evolution Special Task Force for Activating Research (BASESTAR),
Department of Geology, Faculty of Science, Chulalongkorn University, Bangkok 10330 Thailand |
| b |
M.Sc. Program in Petroleum Geoscience, Faculty of Science, Chulalongkorn University, Thailand |
* Corresponding author, E-mail: piyaphong.c@chula.ac.th
Received 3 Nov 2019, Accepted 19 Feb 2020
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