4D fIxED InStaLLatIon SEISMIC 25
Increasing array of 4D kit as the
market shows steady growth
ne of the most important interrogation unit situated on surface facilities.
Since 4D and related
management tools is utilising ocean Interestingly, no subsea electrical power is
systems came into use
bottom systems ... generically required for the array – a feature of the Fosar
in the mid-1990s, there
O
has been a steady
know as 4D seismic ... in order to system that the company says makes it inherently
growth in the market
assess hydrocarbons migration within a reservoir more robust and much more reliable than
and growing array of
and therefore how best to boost recovery rates, comparable electrical systems in harsh subsea
kit and techniques
perhaps through waterflood and CO
2
injection. environments.
designed to improve Since 4D and related systems came into use A vessel, equipped with an airgun seismic
data quality and in the mid-1990s, there has been been a steady source, acquired a 3D grid of shot-points over
therefore provide
growth in the market and growing array of kit and the array; with resulting data from the seabed
better reservoir
techniques designed to improve data quality and receivers recorded using the system’s compact
management tools.
therefore provide better reservoir management interrogation unit.
Jeremy Cresswell
reports.
tools. Stingray sans that analysis of the data-set
Latest into this stable are new confirmed the geophysical
systems by Stingray Geophysical performance characteristics
Seit 4D- und
(Fosar), of the system,
vergleichbare Systeme Schlumberger notably low
Mitte der 1990er (Deep Reading) noise floor,
eingeführt wurden,
and Ion high vector
hat der Markt in
Geophysical’s fidelity, and
diesem Bereich stetig
new acquisition capability to
zugelegt und es
werden immer mehr
optimisation record seismic signals over an
Kits und Verfahren
services 180dB dynamic range – a range
angeboten, um die
arrangement with 1,000 times greater than typical
Qualität der Daten zu
PGS. electrical systems.
steigern und dadurch Stingray has The company says this
bessere Instrumente only just revealed proves that Fosar system can
zur Lagerstätten-
that it has achieved handle even the largest airgun
überwachung zu
successful results arrays at close proximity to the
erhalten. Ein Bericht
from its analysis sensor.
von Jeremy Cresswell.
of data recorded Fosar comprises of four-
during the final component, passive fibre-
Desde que empezaron
sea trial leading to optic sensors comprising
a utilizarse los
commercialization of one hydrophone and
primeros sistemas its Fosar permanent three “orthogonally”
cuatridimensionales y reservoir monitoring mounted
otros sistemas
(seismic PRM) system. accelerometers per
relacionados a
The company says that station or optical sensing
mediados de los 90 se
its system demonstrated unit.
ha producido un
crecimiento estable en
“excellent geophysical It possesses proprietory, highly
el mercado, así como
response” characteristics. efficient, optical multiplexing architecture
una ampliación de la
The offshore evaluation developed in-house to minimize the number of
gama de herramientas
was carried out optical fibers
y de técnicas diseñadas in November
Fig. 1. DeepLook-EM system provides detailed resistivity
required for a
para mejorar la calidad 2008. An array
profiles between wells up to one kilmetre apart.
high channel-
de los datos y por
of multi- count array,
tanto, ofrecer mejores
component receivers, deployed in more than giving it flexibility and making it easy to install
herramientas de
260m water depth, was trenched into the seabed with less impact on oilfield infrastructure than
gestión de los
depósitos. Jeremy
for optimum geophysical coupling and protection alternative seabed seismic systems.
Cresswell informa.
from mechanical damage. A fibre-optic riser cable Stingray claims that the successful sea trials
joined the seabed array to an opto-electronic mean that it has achieved all objectives of the
➠
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