The last decade has shown a significant development in resistivity
measurement technology providing directional resistivity at a larger scale than
conventional logging tools. The latest development can identify resistivity
contrasts ten's of meters around the wellbore.
Statoil has tested deep look-around resistivity on a range of fields
during the last 2 years and recorded data in more than 10 wells on the
Norwegian Continental Shelf. The look-around images provides information at a
scale that bridges the gap between conventional logging and seismic and adds
important new pieces to the reservoir characterization puzzle. In good
reservoir conditions, resistivity contrast up to 30 m away from the well-bore
has been observed.
This study will focus on results from the Visund and Åsgard
fields, and will demonstrate how the device was used in a range of different
applications in the geosteering operation:
Detection of the reservoir boundary up to
20m TVD away.
- Detection of oil bearing reservoir from within underlying shale,
through a water zone.
- Detection of Gas-Oil Contact (GOC).
- Detection of Oil-Water Contact (OWC) up to 20m TVD away.
- Detect faulting of the reservoir.
These examples will highlight why deep look-around resistivity is a step
change related to the possibility for doing pro-active well placement of highly
deviated wellbores as well as for gaining a larger reservoir understanding. The
imaged variation in resistivity contrasts can be related to geologic zonation
and fluid content on the reservoir scale, which opens up a much better
cross-disciplinary communication between geophysicists, geologists,
petrophysicists and reservoir engineers. Finally, the deep resistivity images
contribute in optimization of completion solutions when incorporating
information on the reservoir scale.
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