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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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