GEOCHEMICAL EVALUATION OF THE POSSIBLE SOURCE
ROCKS IN THE OCTOBER FIELD, GULF OF SUEZ, EGYPT.
MAGDI A. EL-GHAMRI AND
ALAA R. MOSTAFA1
Geology Dept, Faculty of Science, Alexandria University, 21511 Moharam Bek,
Egypt..
1Dept. of Environmental Sciences, Alexandria University, 21511 Moharam Bek, Egypt.
|
Three representative crude oil samples from the main producing zones in the October field together with four-source rock samples have been compared in order to evaluate the genetic relationships among them and to characterize geochemically each source rock facies.
The geochemical signatures of the investigated crude oils suggest the presence of two sources that exhibit different geochemical properties. The n-C 15+ saturated fractions for Lower Eocene Thebes Formation and Lower Carboniferous Nubia "B" extracts show characteristics expected for marine derived organic matter. On the other hand, the Upper Senonian bitumen exhibits a normal paraffin distribution skewed towards the higher homolog. This type of signature appears to indicate the dominant input of terrestrial organic matter.
The pattern of oil gravity distribution in the October Field demonstrate that the migration routes are complex and require downward expulsion from the source rocks to charge the reservoir rocks.
|
|