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Denver 2004

An interpreter's overview of the SEG Technical Program

consultant, Centerville, Texas, USA

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

The 2004 SEG Annual Meeting in Denver had over 6500 attendees, 275 companies and universities exhibiting, 908 booths, and 550 oral and 160 poster presentations. Without question the atmosphere of the convention was more upbeat than it has been in over five years. Even the seismic acquisition portion of our industry has seen a noticeable increase in activity. As Mick Lambert (moderator of the TLE Forum on Globalization of the Energy Business) stated, "the industry is in a state of optimistic uncertainty."

The following is a summary of the 2004 technical oral program. All of the presentations are not included, but those I feel are most important to interpreters. There were several excellent poster sessions this year and I suggest reviewing the Technical Program Expanded Abstracts CD to peruse these presentations.

	AVO

 
In an effort to gain more information from long offset data, a three-parameter AVO expression was presented which includes a quadratic term in the shear velocity reflectivity. This appears to be helpful in deriving density reflectivity from noisy data.

Another paper derived a new method that uses curvelet and wavelet transforms to stabilize the three-term inversion. On synthetic data, this approach seems to handle unconformities along the ray parameter direction of the AVO response and can correct for local reflector dip.

To derive density information from three-term AVO inversion, one author employed constraints to regularize the problem of NMO stretch and offset dependent tuning. This approach was successful with synthetic data.

Another presentation addressed the problem in AVO analysis where there is a frequency difference between the near and far offset data. To correct for these frequency effects, a method was employed to first correct for NMO stretch then for absorption (Q) in a deterministic spectral balancing ap-proach.

A thin-layer modeling approach was used in offshore Brazil to estimate . . . [Full Text of this Article]