Journal of Petroleum Geology, Vol.15,
No.1, pp. 71-86, 1992
©Copyright 2000 Scientific Press,
EFFICIENCY OF PETROLEUM
IN MAJOR PETROLIFEROUS BASINS
* Faculty of Earth Sciences, King
Abdulaziz University, Jeddah, Saudi Arabia.
The ratio of the concentration (barrels of
oil equivalent/sq. km) of accumulated oil in the richest
sedimentary basin to that in the poorest basin, among those
basins containing "giant" and "super-giant"
fields is more than 500 to 1. By contrast, the ratio of the
richest to the poorest petroliferous basin in terms of average
organic concentration may be less than 20 to 1. Such a large
discrepancy between these two ratios suggests that organic
concentration alone cannot account for petroleum concentration in
commercial reservoirs, because significant quantities of
petroleum may be lost to the surface and be disseminated
throughout the sedimentary sequence if the trapping conditions
are not suitable. Most of this disseminated petroleum cannot be
produced economically using present-day technology.