Seismic and Image Log Data Integration; a New Approach to Reservoir Quality Evaluation
Frass, Manfred 1
(1)Weatherford Intl., Houston, TX.
3D Seismic, is the lowest vertical
resolution
data available to
start with any reservoir characterization study and on the other hand, image
logs are a data source with the highest
vertical
resolution
used to perform
detailed analysis of a reservoir. The lateral coverage is best achieved with
the 3D seismic and is mostly the only data available, while the image logs are
restricted to the well drilled within the area covered by the seismic. So, in
order to integrate both data sets different processes have been developed and
are applied on a daily bases, and in the past were limited to big features like
tops, structural dip, or any other structural feature, present along the
interval intersected by the well trajectory. From the image logs, now new data
can be derived like a curve defining a sorting index of a sand sequence, or
define the grain sizes of the sand sequence, or a permeability curve derived
from the grain size distribution within a sand sequence, all these curves could
be used to guide inversion processes of seismic data, in order to generate 3D
volumes representing these parameters which were not available before, or were
just points derived from cores along standard logs, but not on a continuous
log. This new methodology opens now the possibility to generate these 3D
volumes, integrating the two most different
vertical
resolution
data sets of
sub surface evaluation of reservoir quality.
AAPG Search and Discovery Article #90135©2011 AAPG International Conference and Exhibition, Milan, Italy, 23-26 October 2011.