Quantifying
Reservoir Uncertainty in Highly-Compacted Depositional Environments Using
Reflectivity Models from
Fuqua, D. Alan1 (1) Chevron
Nigeria Limited,
The use of the seismic amplitude method
for recognizing Direct Hydrocarbon Indicators (DHIs) is generally restricted to
Class 3 and Class 2n AVA reflectivity. When the reservoirs of interest are more
compacted and indurated the seismic signature is generally Class 1 or Class 2p
AVA. In this scenario our ability to recognize fluid effects is severely
diminished, and in many cases our ability to recognize reservoir is
significantly subdued as a result of the large geological ambiguity in the
system, i.e., determining shale-shale reflectivity from shale-reservoir reflectivity
is extremely difficult. As we explore and develop in deeper water environments
our need for the capability to seismically identify reservoir and fluid in the
presence of geological ambiguity becomes more prevalent. This paper introduces
a workflow to quantify our ability to recognize reservoir and/or DHIs in the
presence of Class 1 and Class 2p AVA reflectivity and the large geological
ambiguity that arises from these classes of reflectivity. Half space models are
constructed from
AAPG Search and Discover Article #90063©2007 AAPG Annual Convention, Long Beach, California