Gulf of Mexico Shelf:

   EI-27 and EI-46      CIB CARST Sands

A very slightly depleted and an untapped (at time of the 3D seismic recording) CIB CARST gas sand reservoir, at ~10,500 feet

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.


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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