| dc.description.abstract | A study of depositional material and environment of specific organic rocks
Abstract
Although the mechanism of coalification process had been well discussed in literature, detailed studies of special organic rocks are still lacking. In this study, samples from China including torbanites from Fushun and Zibo, as well as oil shales from Maoming were studied and compared with humic coals from Lifung, Taiwan. Methods employed in this study include petrographic analysis, elemental analysis, Rock-Eval pyrolysis, and GC/biomarker analysis. The following conclusions are drawn after combining experimental results and regional geologic information of each sample: (1) Torbanites from Zibo might be formed in a swamp covered by shallow water, whereas its source organic matters might be originated from wax-dominated plant. In addition, its depositional environment might be close to other organic source, since Zibo torbanite contained some reworked organic matters；(2) Results of GC/biomarker analysis indicate the organic matter of torbanite from Fushun shares similar characteristics with that of Zibo. Furthermore, the vitrinite reflectance histogram of Fushun torbanite shows it does not have any other organic materials included from nearby sources；(3) Although the coal of Lifung has less liptinite content than Zibo and Fushun, it has the least liptodetrinite content in liptinite groups. The coal of Lifung is thus believed to be less affected by depositional activities than other three samples during coalification； (4) The organic matter of oil shale from Maoming consists of algae and land plants. The results of Rock-Eval pyrolysis indicate that although the Maoming oil shale possess good hydrocarbon source potential, its organic carbon content is relatively low, comparing with other three samples.
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