Petro-Ed

presents

A.V.O.: (Amplitude-Versus-Offset)

Duration: 2 days

Designed for: The course is applied rather than theoretical and with its practical approach and exercises will benefit geologists, engineers and technical assistants as well as geophysicists who have little experience of the method.

The introduction of Amplitude-versus-Offset (A.V.O.) as a stratigraphic modelling and interpretation methodology in the early nineteen eighties produced a sense of optimism that the seismic toolbox was now complete and that the threat of artificial "Bright Spots" was gone.

Initial success in some clastic reservoirs was followed by a lack of success in other clastic reservoirs and a pervasive feeling that carbonate reservoirs would not be amenable to the technique.

While the fundamental theory based on the Zoeppritz equations is valid there are many aspects of seismic data modelling, acquisition and processing which were not compatible with evolving technology. Serious problems were encountered with the amplitude effects of the geophone array, thin bed tuning, multiple interference, partial gas saturation, inadequate offset and overly simplistic modelling algorithms. These and other problems must be dealt with systematically before A.V.O. methods can be properly applied.

This two-day course will address the fundamentals of A.V.O., emphasise the problems and provide methods of dealing with the problems to make A.V.O. an effective stratigraphic tool.