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The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
Abstract: Seismic Guided
Log
Property Mapping:
A Controlled Study
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A good understanding of the spatial
distribution of hydrocarbon reservoir
properties, such as porosity, water saturation,
permeability and formation volume
fractions makes the task of planning
developmental drilling and estimating
reserves more tractable. When we have
3D seismic data over the reservoir, we use
it routinely and effectively to estimate the
structure of the reservoir body (or at
least the geological structure controlling
the reservoir). On the other hand, when
it comes time to create maps of reservoir
or rock properties, log
data and regional
geological information are used to the
exclusion of the seismic. Today the technology
is at hand to analyze 3D seismic
attributes with borehole data to identify
statistically significant relationships, and
then to generate seismic guided property
maps which show both increased resolution
(detail) and increased accuracy
(ability to predict).
To demonstrate the increased accuracy
of maps created in this fashion, we
made a controlled study on a producing
field in a marine environment. The
reservoir was covered by good quality 3D
seismic data, while fifteen logged wells
provided spatial control for maps of
properties. Estimates of the distributions
of two properties, porosity and water saturation,
were made for a producing layer
from well
data, both with and without
seismic attribute guidance. Five differing
development scenarios were simulated,
where wells were withheld from the
analysis
, and used for validation. The
maps generated with seismic guidance
gave increased detail in all cases, and
increased predictive accuracy in four of
the cases. In the best result, which came
from a stepout scenario, maps generated
using seismic guidance were two times
more accurate for porosity, and two and
one half times more accurate for water
saturation. The results of controlled
studies, such as this one, suggest a simple
but profound conclusion: we get better
estimates of the distribution of rock and
reservoir properties away from
well
control
when using 3D seismic attribute
guidance.
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