DENSITY EFFECTS ON SEISMIC REFLECTIVITY OF THE UPPER CRETACEOUS ROCK UNITS IN THE NORTH OF QARUN LAKE, NORTHEAST WESTERN DESERT, EGYPT

The density of rocks is a significant physical parameter in geophysical studies, particularly in gravity and seismic interpretation, as the anomaly sources is due to local variation in density. Formation density compensated logs are useful tools to study the density distribution within the thickness range of the sedimentary section.
The present study is concerned to set some relationships between seismic reflectivity and the physical properties (porosity and density) and the lithologic composition of the Upper Cretaceous rock units (Abu Roash and Bahariya Formations) in the area located to the north of Qarun lake, northeast Western Desert, Egypt. The available well logging data are used to determine the lithologic components, porosity and density of the studied rock units in four wells (Qarun G-1X, East Qarun-1X, N.B.Q.-2X and Gindi Deep-1X).
The velocity and density data are interpreted in order to define the seismic reflectivity at the interface of the rock units. The results proved that the reflection coefficient estimated from velocity and density is maximum at the boundaries between clastic and non-clastic rocks