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HYDROCARBON DISTRIBUTIONS AND CARBON ISOTOPE
VARIATIONS IN THE SURFACE PETROLEUM OCCURRENCES
AND POTENTIAL SOURCE ROCKS
IN NORTHWEST LEYTE

RAYMUNDO A. REYES, JR.

 

 

 

 

ABSTRACT



Surface hydrocarbon occurrences and potential source rocks in the north western peninsula of Leyte were subjected to vitrinite reflectivity, organic-geochemical and carbon isotope studies to establish geochemical trends and probe possible genetic relationships. Results indicate that (1) landĚderived organic matter has contributed strongly to the potential source materials of the Taog, Tagnocot and Bata formations (2) the bitumen impregnated in the sandstone members of the Bata formation is not autochtonous and must have migrated from a prolific source rock (3) the surface hydrocarbon occurrences originated from a common source (4) biodegradation processes have altered the seeps and bitumen in varying degrees (5) the Taog formation has relatively the best source potential and maturity level for hydrocarbon generation in the area. A certain degree of correlation exists between the surface shows and the Taog formation although it is probable that the shows have been derived from more mature sections of the formation rather than from the stratigraphic horizons of the samples studied.
 

 

 

 

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