3DSymSam - Geophysical Advice provides advice on 3D seismic survey design based on 3D symmetric sampling theory and offers courses on 3D seismic wavefield sampling and various acquisition techniques.

This website also contains some contributions to current and past geophysical discussions.

In October 2002 the SEG published “3-D seismic survey design” by Gijs J.O. Vermeer. This book is a slightly modified version of Vermeer's PhD thesis, which was published early 2001. The Leading Edge of May 2003 published a rave review of the book. A Chinese translation appeared in 2008.

Dit huis in Oldemarkt met schitterend uitzicht over water en weilanden is te koop. Zie voor meer foto's Zieltjes 28, Beschrijving, Webmagazine. This house in Oldemarkt with a spectacular view across water and farmland is for sale. More pictures at Zieltjes 28.

Huis te Koop, Wonen aan het water, Weerribben, Kop van Overijssel, Oldemarkt, vrijstaande woning, open vaarwater

Some points of interest on the 2010 EAGE Conference in Barcelona are listed in Barcelona.

A web version of 3DSymSam's Acquisition Design Wizard has been installed on this website. Just click “Design Wizard” on the menu on the left to gain access to the Wizard.

Wide-azimuth towed streamer data acquisition is becoming quite popular, albeit very expensive. To increase efficiency it has been proposed to use simultaneous sources. This website now includes a paper that argues that WATS configurations with parallel source and receiver tracks cannot benefit much from simultaneous sources. Instead a zigzag WATS is proposed.

Here follows some text from the introduction

“This paper starts with the description of some characteristics of a typical WATS configuration. Next it is argued that this configuration can be viewed not only as parallel geometry but also as areal geometry, because a major objective of WATS is to acquire 3D shot gathers. If viewed as areal geometry, the inline source sampling is often quite dense, whereas the crossline source sampling is often quite coarse. Other aspects, such as binsize, edge effects and feathering, are discussed as well in the light of what would be an ideal areal geometry. Next, I argue that simultaneous sources will only help to reduce acquisition cost and time of areal WATS configurations in case more than about 8 sources are used.

Geometries that would benefit from simultaneous sources are those that require dense sampling of sources along the source lines. Narrow-azimuth geometry and zigzag WATS are discussed as examples of such geometries. This paper is rounded off with a discussion of pros and cons of zigzag WATS configurations.”

Summary and Full paper

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