Variations in the Degree of Catagenesis and Hydrocarbon Generation in the Source Rocks of the Sirt Basin, Libyaстатья
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Дата последнего поиска статьи во внешних источниках: 19 сентября 2015 г.
Аннотация:Abstract—The thermal history of the Sirt Basin and realization of its hydrocarbon potential were modeled
using the GALO numerical simulation system and a refined database of temperatures measured at various
depths, vitrinite reflectance, and detailed data on vertical sections of the basin. These models are more accu
rate than preexisting basin models, which were underlain by the assumption that the temperature gradient
remained unchanging throughout the whole evolutionary history of the basin. The burial history, temperature
variations, and the maturity of organic matter in the sedimentary rocks of major tectonic structures in the Sirt
Basin were numerically simulated with regard for multiple tectonic (stretching) and thermal reactivation of
the lithosphere beneath the basin. The modeling was conducted for eight seismic sections arranged along a
profile trending from east to west, from the Cyrenaica Platform in the eastern flank of the basin to the Hun
graben in its western flank. Along with the traditionally analyzed Sirt source rocks of Campanian age, we ana
lyze the outlooks of hydrocarbon generation in the preCampanian rocks. Our modeling results suggest that
organic matter (OM) of Lower Cretaceous rocks in the Hameimat, Ajdabiya, and Maradah troughs was
highly mature when some hydrocarbons (HC) could decompose into gas and coke in the course of their sec
ondary cracking. The rocks of the Upper Cretaceous formations (95–65 Ma), including the widely known
source rocks of the Sirt Shale, Formation, can be viewed as intensely generating oil within all modeled areas
of the basin, except only the Hun graben and the Zelten and Dahra platforms.