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The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
Abstract: Case Studies Using Sequence Stratigraphy on an Interactive 3-D Seismic
Workstation
By
1The Energists
2Landmark Graphics Corporation
Interpretation
of 2-D and 3-D seismic data
using workstations has greatly enhanced
our exploration and exploitation efforts.
The ratios of successful/nonsuccessful
wells have improved, and finding costs
have been reduced. The primary emphasis
of these efforts has been
structural
interpretations,
however. This has been dictated
largely by the available software. The
stratigraphic
component has been underutilized
and not exploited. Review of many case
histories that describe the traps as being
structural
shows stratigraphy to be a significant
component of the traps.
Stratigraphic
analysis of seismic data on
workstations is now possible; software is
available from several sources. We have
applied these tools to
interpretation
problems
in the Gulf of Mexico, North Sea,
North Africa, South America, and southeast
Asia. The methodology involves describing
and assigning values for seismic
attributes such as the external geometry,
internal reflection configuration, amplitude,
and continuity to areas bounded horizontally
by horizons and vertically by internal
partitions ("schzaa M" lines). These attributes
and well data are used to make
lithofacies, systems tracts, and depositional
environment predictions for each interval
of interest. The predictions are then interactively
projected to map view. Their values
are electronically contoured to produce
maps of the seismic facies, external geometry,
continuity, amplitude, systems tracts,
lithofacies, and depositional environments;
these can easily be plotted at various scales.
It is also possible to effect a
chronostratigraphic analysis and restore
missing intervals.
We will present case histories from the Gulf of Mexico and North Sea that will show the application of these types of analyses to carbonate ramps, deltaic clastics, submarine fans, and basin inversion and erosion.
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