RESERVOIR QUALITY DISCRIMINATION OF THE LOWER PART OF BAHARIYA FORMATION IN NORTH QARUN OIL FIELD, WESTERN DESERT, EGYPT

Othman, A.A.A.; Nabawy, B.S.; Abdel Hafeez, T.H.; Saher, M.; AbdelKader, R.R.

doi:10.21608/jegs.2008.380855

RESERVOIR QUALITY DISCRIMINATION OF THE LOWER PART OF BAHARIYA FORMATION IN NORTH QARUN OIL FIELD, WESTERN DESERT, EGYPT

Document Type : Original Article

Authors

¹ Department of Geology, Faculty of Science, AlAzhar University, Cairo

² Department of Geophysical Sciences, National Research Centre, Cairo

³ Department of Geology, Faculty of Science, AlAzhar University, Cairo.

⁴ Apache Oil Company, Cairo

⁵ North Bahariya Oil Company, Cairo

10.21608/jegs.2008.380855

Abstract

The horizontal and vertical permeability values (kH and kV) are dependant mainly upon the measured porosity in a very good direct proportional relationship. Helium porosity values are more precious than the summation fluids porosity for calculating permeability in both vertical and horizontal permeability due to the high clay content.
The statistical analysis of the core data showed good storage capacity properties through the middle and upper parts of the studied sections of Bahariya Formation in N. Qarun Oil Field. It is characterized by high porosity, high permeability, low bulk density and low anisotropy values (< 2.14). The anisotropy values of the other bad storage capacity horizons, may reach up to 35 which gave rise to heterogeneity in the storage capacity distribution in the 3D, more channel and pore throat complexity. This could be attributed to a random effect of the diagenetic factors through the studied depth interval. Presence of some anisotropy fraction values (< 1.0) is attributed mainly to vertical fracture permeability has acted through the vertical plain, whereas presence of very high anisotropy values (up to 35) could be attributed to some fissile beds containing high clay content. However, these anisotropy anomalies are recommended to be used as marker anomalies or traces to follow up the bay zones through the different bore holes.
Application of the technique of Amaefule et al. (1993) allows a more precise definition of reservoir discrimination. Excellent agreement was obtained between the vertical distribution of Reservoir Quality Index (RQI) and Flow Zone Indicator (FZI).