Rock Physics
Analysis from Well Log Data of Carbonates
Choudhury, Suryyendu1, Manika
Prasad1, R.D Chourasiya2 (1) IIT-Bombay, India, Mumbai,
India (2) Oil and Natural Gas Corporation Ltd, Mumbai, India
We have analyzed the well log response of
carbonate sequences from passive margin basin in terms of repeatability of
signals, trend development and examined possible rock physics transforms. The
study incorporated interrelationship of the various logs like GR, Resistivity,
NPHI, RHOB and sonic logs. The relationships between various rock properties
vary from diffused, clustered to well defined trends. For example, bulk
density–neutron porosity are inversely related but are scattered in few
horizons. Neutron porosity-velocity data are scattered: we could not decipher a
trend in some horizons. The repetitiveness of a signal in varying scale (few
meters to 10s' of meters) may be explained by changes in the depositional
pattern of the area. We attempt to explain these observations from geological
point of view thereby tying up the petrophysical observations with the
background geological knowledge. We look upon the
AAPG Search and Discover Article #90063©2007 AAPG Annual Convention, Long Beach, California