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Biological markers in bitumens and pyrolyzates of Upper Cretaceous bituminous chalks from the Ghareb Formation (Israel)

Biological markers in bitumens and pyrolyzates of Upper Cretaceous bituminous chalks from the Ghareb Formation (Israel). Rullkoetter, Juergen; Aizenshtat, Zeev; Spiro, Baruch (Inst. Pet. Org. Geochem., Kernforschungsanlage Juelich G.m.b.H., Juelich D-5170/1, Fed. Rep. Ger.). Geochim. Cosmochim. Acta, 48(1), 151-7 (English) 1984. CODEN: GCACAK. ISSN: 0016-7037. 71117-87-8 and 67597-29-9 are cas registry numbers of chemicals which are used as reagents here. DOCUMENT TYPE: Journal CA Section: 51 (Fossil Fuels, Derivatives, and Related Products) Section cross-reference(s): 30, 32 The sterane and triterpane distributions of 3 bituminous chalks from the title formation were investigated both in the original extractable bitumens and in exts. obtained after pyrolysis of whole rock and isolated kerogen samples at 450°. Pyrolysis was performed in a closed system under hydrous (whole rock) and anhyd. conditions (isolated kerogens). The C no. distributions of steranes and triterpanes differ significantly between original bitumen and pyrolyzates. Unlike the bitumens, in which diasteranes were not detected, the anhyd. pyrolyzates contain small amts. of diasteranes. The presence of water during pyrolysis leads to an increase of sterane isomerization, the abundant formation of diasteranes and an increase of the 18a(H)-trisnorneohopane [55199-72-9]/17a(H)-trisnorhopane [53584-59-1] ratio. Sterane isomerization maturation parameters show a closer match between original bitumen and pyrolyzates after pyrolysis in a closed system when compared with pyrolysis in an open system. .

Biological marker distribution in coexisting kerogen, bitumen and asphaltenes in Monterey Formation diatomite, California

Biological marker distribution in coexisting kerogen, bitumen and asphaltenes in Monterey Formation diatomite, California. Tannenbaum, Eli; Ruth, Edward; Huizinga, Bradley J.; Kaplan, Isaac R. (Inst. Geophys. 53584-59-1 and 60305-22-8 are also occured in this study. Planet. Phys., Univ. California, Los Angeles, CA 90024, USA). Org. Geochem., 10(1-3), 531-6 (English) 1986. CODEN: ORGEDE. ISSN: 0146-6380. DOCUMENT TYPE: Journal CA Section: 51 (Fossil Fuels, Derivatives, and Related Products) The Monterey Formation diatomite from California contains 18.2% org. matter (94% bitumen and 6% kerogen). Biol. markers from the bitumen and from pyrolyzates of the coexisting asphaltenes and kerogen were analyzed. While 17a(H),18a(H),21a(H)-28,30-bisnorhopane (I) [107172-46-3] was present in the bitumen and in the pyrolyzate of the asphaltenes, it was not detected in the pyrolyzates of the kerogen. A C40-isoprenoid with "head to head" linkage, however, was present in pyrolyzates of both kerogen and asphaltenes, but not in the bitumen from the diatomite. The maturation level of the bitumen, based on the extent of isomerization of steranes and hopanes, was that of a mature oil, whereas the pyrolyzate from the kerogen showed a considerably lower maturation level. These relations indicate that the bitumen may not be indigenous to the diatomite and that it is a mature oil that migrated into the rock. Possibly, however, some of the I-rich Monterey Formation oils were not generated through thermal degrdn. of kerogen, but expelled from the source rock at an early stage of diagenesis. .