Jonny Hesthammer1,
Francisco Porturas2
(1) Statoil, 5020 Bergen, Norway
(2) FP Geo, 4041 Hafrsfjord, Norway
Abstract: Subsurface Integration - the Fifth Dimension: A Case
Study From the Gullfaks Field
, Northern North Sea
In order to fully understand the
structural reservoir characteristics, it is necessary to integrate results from
detailed analysis of core data
, dipmeter
data
, image
data
, well log correlation
data
, seismic
data
and
field
analogue
data
. Such an integrated approach will
allow for a fuller understanding of variations in fluid flow patterns within
the reservoir and optimal placing of wells.
We present an example
of
integrated analysis carried out on the Gullfaks
Field
, Northern North Sea. In
this case study, dipmeter
data
(here exemplified by the use of resistivity
imaging
data
)from well 34/10-B-12 and seismic
data
helped in finding the orientation
of a fault associated with 69 m missing section (as observed from well log
correlation
data
). Core
data
from the well allowed for examination of
deformation structures as well as permeability and porosity measurements. From
thin section analysis it is possible to observe how phyllosilicates effectively
seals the micro-fractures (deformation bands), thus restricting fluid flow
across the fractures. Core
data
demonstrates that all faults in the sandstone
reservoir on the Gullfaks
Field
are associated with numerous deformation bands
in a narrow damage zone near the fault. Since each of the deformation bands
restrict fluid flow, an understanding of the spatial distribution (from well
data
, seismic
data
and
field
analogue
data
) and petrophysics (permeability and
porosity) associated with faults on the Gullfaks
Field
is crucial in order to
optimize
field
development and in cases where 'downhole factories' could be the
future scenario.
AAPG Search and Discovery Article #90914©2000 AAPG Annual Convention, New Orleans, Louisiana