line-level: 2" class=MsoNormal>Characteristics of Kerogens and Their Carbon Isotope Implications for the ShengliRiver Oil Shale in QiangtangBasin, Northern Tibet
///The ShengliRiver oil shale in the southern part of northern Qiangtang Depression within northern Tibetan Plateau has a EW-extending length of more than 34 km and a width of 9 m in the north-south direction. Such oil shale is of great importance in the assessment of oil and gas resources in Qiangtang Basin. The oil shale has high kerogen contents and H/C ratios (1.11~1.19) and low O/C values (0.08~0.25); implying a fairly ideal source rock. The oil shale and interbedded marl from the ShengliRiver area in Qiangtang Basin have a remarkably heavy Ckerogen isotopic composition, ranging in δ13C values of the bulk organic matter from -20.79‰ to -21.78‰. The enrichment of 13C in the ShengliRiver oil shale can be attributed to a combination of the high growth rate and the sedimentary environment, with the paleo-lagoon environment obviously controlling the spatial distribution and size of oil shale.