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The AAPG/Datapages Combined Publications Database
GCAGS Transactions
Abstract
Malacca 3-D -- A Comprehensive Approach to Seismic
Data
Acquisition
in Transition Zones
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ABSTRACT
A 3-D seismic survey utilizing innovative techniques and technology has been performed in an extremely challenging transition zone program acquired in the Malacca Strait region of Sumatra, Indonesia.
Although this project was nearly antipodal to the Gulf Coast,
it is an excellent example of salt water transition zone and marsh
3-D seismic data acquisition
. In addition to heavy jungle, the
project crossed water with depths of up to 50 meters and tidal
currents of five to seven knots. These conditions would normally
have dictated the use of two different
acquisition
systems for
the project; a
land
/marsh system and a bay-bottom system. Utilizing
two systems introduces several problems to the
acquisition
contractor.
Capital equipment expenditures increase, because the contractor
must either rent or purchase two systems. The contractor also
faces increased logistics in supporting two systems and training
personnel in the use and deployment of two systems. The end user
may also face compromises, because he must merge data sets from
what are essentially discrete surveys recorded by two different
systems. This may introduce
geometry
errors, inconsistent data
quality, and increased data processing costs.
Geo-X System Ltd.'s ARAM24 system offered technology developed in the Gulf Coast of Texas and Louisiana that enabled the contractor to use a single system on the entire project, thereby eliminating the logistical and economic difficulties associated with the two system approach.
The solutions adopted in response to this very difficult acquisition
problem offer a comprehensive approach to seismic data
acquisition
in the transition zone environment.
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