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 Movie #2: Shows a VoxelGeo-animated D3D-impedance representation of two interpreted-actual gas reservoirs:
One CIB CARST gas sand reservoir CIO that was un-drilled at the time the 3D seismic was recorded (1995), at Eugene Island Block 46; and
One (most likely slightly depleted) CIB CARST gas sand CIO, at EI-27.
They were both found at an approximate depths of 10,500 feet. As it turned out, Norcen Exploration drilled their #2 well into the edge of the southern, hazier, less compact reservoir CIO. It had produced about 27 billion cubic feet of gas and condensate equivalent (BCFGE), from 1996-2002. In December 2002, EPL drilled their #1 well into the northern reservoir CIO, with the exploratory drill site based on a modest seismic amplitude anomaly on conventionally processed (non-D3D-impedance) data, apparently down-time-dip from the Odeco #4 well. This older, abandoned #4 well had produced over 8 BCFGE (from what is now thought to be the same CIB CARST sand unit, re-perforated by EPL), between 1977 and 1984. The D3D-reprocessing showed that:
The reservoir CIO volume was much larger than the 8 BCFGE already produced, so it was probably not just the "footprint" of the depleted reservoir, and
The CIO had a flat base, suggestive of low density and velocity (i.e., Acoustic Impedance) gas, trapped above a higher impedance fluid, either oil or water.
Acknowledgement
VTV, Incorporated, acknowledges written permission to publish these images, from EPL, and Fairfield Industries (the owner of these multi-client seismic data).
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