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The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
Abstract: Advances in Subsurface Prediction Using
Borehole
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By
Schlumberger Wireline & Testing
The high vertical and radial resolution of
modem borehole
imaging
provides a detailed,
three-dimensional insight into how
a reservoir is put together. Since this information
is presented in an image or picture
format, it is easy to assimilate and utilize
on workstations. The excellent repeatability
of most images fosters confidence in
their usability. Micro-resistivity, resistivity,
and acoustical measurements and an expanding
array of software to analyze them,
are being utilized worldwide.
Borehole
imaging
can be used to analyze
the structural and stratigraphic aspects of a
reservoir, as well as to describe it in great
detail and in a variety of different scales
and formats. Image evaluation, especially
when done on a workstation, provides an
in-depth understanding of a reservoir, making
improved subsurface predictions possible.
Two specific applications illustrate
the power of these images.
The use of imaging
in "low resistivity pay"
sands, such as the prolific deep water sands
of the Gulf of Mexico, affords the ability
to evaluate thin (as small as 1 cm) beds that
are well below the resolution of other
wireline logs. It also provides a better understanding
of the type and distribution of
the shales within the sands, which greatly
influence the lateral continuity of the reservoir.
Net pay is more accurately determined,
and this routinely results in additional
pay.
Borehole
imaging
is also changing the way
we evaluate carbonates, as in the Lodgepole
Formation of North Dakota and the
various carbonates of West Texas. Current
evaluation techniques seem to often underestimate
the ultimate production of these
reservoirs. The high vertical resolution and
multidirectional (radial) nature of the
imaging
measurements allow for corrections
to other logs, especially pad
devices
such
as the density log. The distribution and
interconnectivity of vugs and fractures,
which are keys to the performance of these reservoirs, can be "seen" and more fully
delineated.
Exciting new types of imaging
measurements,
including "measurements while
drilling," as well as improved ways of presenting
and evaluating the data, continue
to be developed by a variety of companies,
making
borehole
imaging
a truly emerging
technology.
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