ABSTRACT: Brunei deepwater exploration; 3D seismic
facies of low net-to-gross
channel-levee systems on the Brunei slope
Tromp, Jan Pieter, Zulkifli B. Ahmad, and Yoshi Pang , Brunei Shell Petroleum Company, Seria, Brunei
The Miocene-Recent Brunei continental slope is punctuated by mobile clay ridges that
run parallel to the present day shelf edge. A three dimensional seismic
facies
interpretation, calibrated with well data, shows that very large but low
net-to-gross channel-levee systems are locally present on the outboard side of these
clay ridges.
Recognition of the gull-wing geometries of the channel-levee systems on seismic
strike
sections is problematic due to the subtle relief of the compacted levees, the relatively
wide and shallow channel valleys and the modification by erosive events. It appears that,
with increasing burial depth and decreasing
seismic
resolution, these systems are more
readily recognised by their convergent thinning geometry on dip sections.
The relationships between the channel-levee systems and other slope processes, like
canyon formation and mass flow deposition, have been studied in a shallow 3D seismic
analogue from the Brunei slope. This high resolution example also shows how the lateral
and
vertical
development of canyon-confined channel-levee systems are controlled by the
syn-depositional movement of the clay ridges.
AAPG Search and Discovery Article #90913©2000 AAPG International Conference and Exhibition, Bali, Indonesia