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OTC 2004 = four days of cutting edge geophysics and geology

OTC Geophysical Technical Program Committee

The first 20% of the full text of this article appears below.

This year OTC will attract well over 50 000 attendees, making it the world's largest petroleum technology venue. The exhibition floor will be filled with vendors selling everything from the furthest upstream exploration services all the way to equipment for actually producing that "black gold." The technical program will run concurrently with the exhibition. This article summarizes some sessions aimed directly at the working geoscientist:

	TimeLapse Seismics, summary by session cochairmen Dan Ebrom and Gene Sparkman

 
If there's a single technology that is making engineers actually want to sit down with a geophysicist for a workstation session, it's time-lapse seismics. Time-lapse technology is delivering on its promise as the key to increased production, decreased operating costs, and improved recovery rates. This session presents talks from each of the three supermajors, talks from two leading major oil companies, and two significant 4D contractors. This session will have the first public results from Valhall, the world's largest 4C permanently instrumented field to date. Here's a smattering of teasers from participants.

Brackin Smith: "We find that 4D seismic response to pressure changes can give surprising brightening of amplitudes—even though velocities increase as effective pressure increases, the V_P/V_S ratio can decrease, brightening far stack amplitudes."

Dave Davies: "Interbedded shales (and other nonreservoir rocks) in and near the reservoir sequence in a field have 4D pressure responses that can be removed from combined fluid and pressure effects in the reservoir to yield accurate . . . [Full Text of this Article]