Implementing Technology with Efficiency: A Case History of 3D Seismic in Egypt
By
David J Monk1, John Bedingfield2, Ashraf Orabi2, Brian Boutte3
(1) Apache Corporation, Houston, TX (2) Apache Egypt Company, Maadi, Egypt (3) Khalda Apache Company, Maadi, Egypt
In 2000, Apache became involved in what subsequently became one of the
largest 3D land
surveys ever to have been shot in Egypt (close to 5000 sq km of
data will be finally processed). By performing an evaluation of the traditional
methods of seismic
acquisition
which had been implemented at the beginning of
the survey, and making fundamental design changes, it proved possible to improve
the seismic data, and
acquisition
in all ways: Data Quality through higher fold
and better noise attenuation; Longer offsets; Broader Azimuth distribution and
of equal importance, better efficiency of
acquisition
. For such a large survey,
small improvements in efficiency can have a large impact on the total cost of
the survey.
In this paper we will review the changes that were made from the traditional
approach that was initially implemented, and show examples of the improvements.
By reviewing the ideas that were implemented to change the fundamental
philosophy for shooting data, we will show how balancing the various aspects of
work on a seismic crew can lead to better overall efficiency, in this case
increasing the average acquisition
area per day by 40%. Additionally, an
examination of the azimuth distribution in the data shows why better azimuth
distribution can (and did) lead to more noise attenuation.