Fluvial
Reservoir Architecture from Near-Surface 3D Seismic Data, Block B8/32,
Samorn, Hathaiporn1
(1) Chevron
This study aims to document the
distribution and internal architecture of fluvial sand bodies using 3D seismic
data from the
Multiple channel systems are imaged.
Compiled measurements from each channel include channel width, channel-belt
width, cumulative length along each channel, channel length, half-meander
wavelength, amplitude, asymmetry, azimuth, sinuosity, point-bar sizes and volumes,
channel gradient, thickness of each channel, width/thickness aspect ratio, and paleocurrent direction.
The most clearly defined evidence for
incised valleys is the presence of small tributaries. Also, incised valleys
tend to be deep and wide systems that cut across older seismic reflectors. Six
sequence boundaries are interpreted in this study interval, based on the
presence of six levels of incised valleys. Channels that are not tributaries to
incised valleys or incised valleys, are classified as unincised fluvial channels. These channels do not have
tributaries. They are also smaller in size, and it is hard to see point bars
and other internal architecture within the seismic data. They are imaged in
only a few successive slices, as their thicknesses are significantly less than
the incised-valley systems.
AAPG Search and Discover Article #90063©2007 AAPG Annual Convention, Long Beach, California