Abstract
The Talimu Basin in China consists of a Paleozoic platform and a Meso-Cenozoic land block series. On the basis of sedimentological and tectonic studies of the Talimu Basin, it is proposed in this paper that two different kinds of oil-generating sub-basins and source beds are present, and responsible for the formation and accumulation of both marine and nonmarine hydrocarbons. A preliminary evaluation for different source beds within the basin has been carried out using the disciplines of sedimentology, lithofacies-paleogeography and organic geochemistry. We distinguish various depositional settings, with different oxidation and/or reduction features, by showing systematic differences in relative molecular distributions. These include characteristic facies-related biomarkers, such as tricyclic terpanes, pregpanes, fluorenes, dibenzofurans and dibenzothiophenes. Types of organic matter in source rocks are revealed by the presence/absence of land plant-derived biomarkers, including pimarane, abietane, dehydroabietane, fluoranthenes, chrysenes and perylenes. Kerogens, from black mudstones of the Saergan Formation and the Yingan Formation at the northwestern margin of the basin, have been selected for detailed examination of their hydrocarbon potential. Favorable regions for hydrocarbon prospecting in the basin are also discussed.
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