CATAGENESIS OF ORGANIC MATTER OF OIL SOURCE ROCKS IN UPPER PALEOZOIC COAL FORMATION OF THE BOHAI GULF BASIN ( eastern China )
Li Rongxi, Li Youzhu, Gao Yunwen
Changan University, 126 Yanta Road, Xian, 710054, China
Keywords: Oil source rocks; coal formation; Carboniferous-Permian system; Bohai Gulf basin
Pages: 415-421
Abstract
The Bohai Gulf basin is the largest petroliferous basin in China. Its Carboniferous-Permian deposits are thick (on the average, ca. 600 m) and occur as deeply as 5000 m. Coal and carbonaceous shale of the Carboniferous Taiyuan Formation formed in inshore plain swamps. Their main hydrocarbon-generating macerals are fluorescent vitrinite, exinite, alginite, etc. Coal and carbonaceous shale of the Permian Shanxi Formation were deposited in delta-alluvial plain. Their main hydrocarbon-generating macerals are vitrinite, exinite, etc. The carbonaceous rocks of these formations are characterized by a high thermal maturity, with the vitrinite reflectance R0 > 2.0%. The Bohai Gulf basin has been poorly explored so far, but it is highly promising for natural gas.
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