Structural Modelling
The structure of a field is often one of the most critical components
of the reservoir model and can account for the greatest uncertainty
in terms of in-place reserves. Combine this with the time it can take
to build accurate models, and the limitations in many approaches,
and you have a significant drain on the asset team and a significant
source of uncertainty in the field model. In RMSStructure, you have
one of the most significant productivity and accuracy enhancement
opportunities available in reservoir management or field
development planning today.
IN SUMMARY
• Easily produce complex geologic models – from thrust
faults to salt domes.
• Cutting edge technology produces geologically accurate
grids with many intersecting faults.
• Nested workflows build models from interpreted horizons
and isochore derived horizons.
• Advanced fluid contact handling and model gridding yields
better simulation results.
Fast, Simple Structural Modelling
Roxar’s structural modelling solution provides tools and workflows
for getting from data to grid in the minimum number of steps
without compromising the structural integrity of the model. The
integrated structural modelling system is helping clients to achieve
maximum reservoir performance from better decisions made
through quick and accurate characterisation of their reservoirs.
Image with air interpretation
The tools and technology for fault and horizon modelling can reduce
the time required to build a structural framework from weeks to
days. This releases users to either build more scenarios to improve
the level of uncertainty understanding of the reservoir, or to work on
other projects, significantly enhancing productivity.
When combined with the workflow management tools, the model
update process is fast and streamlined. This ensures timely decisions,
yielding a much higher ROI on data acquisition and
interpretation time. Models can also be updated in real time as part
of Roxar’s geosteering workflows.
Structural Modelling
Real Faults
Improved Reservoir Simulation
Roxar’s structural modelling can handle thousands of faults, allowing
extremely complicated structural models without requiring
over-simplification. The level of structural complexity modelled is
now a user choice rather than a software limitation. Fault surfaces
closely honour the input data while users retain detailed control.
Fault surfaces honour well picks, they may die out laterally or in
depth, and can be truncated by unconformity surfaces. Any type of
antithetic and synthetic fault intersections can be modelled,
including Y faults, lambda faults, K faults, as well as crossing
conjugate or X faults. Fault truncations can be a combination of
automatic and interactively defined in 3D. Finally, a fault QC tool
guides the user through checking fault surface shape, fault/fault
intersections, and truncations. This tool is indispensable for ensuring
high quality models.
The 3D grid building, designed to work with the structural
framework building, ensures that as much of the structural
complexity as possible is incorporated into the grid. Any set or subset
of faults may be treated as pillar or stair-stepped faults. The unique
methodology used for stair-stepping reverse faults eliminates the
shadow zone problems often seen in corner point grids, and
maintains layer connections across the fault blocks. The grid layering
can be proportional, conformal, or a combination of the two, which
reduces the number of inactive cells when zones are truncated by
unconformities. Boundaries between zones may be regularised,
eliminating wedge-shaped cells and improving flow simulation.
Geologically accurate grid layering is generated using extrapolated
interpretations of eroded stratigraphy to control layering under
unconformities. Flexible control line tools aid the design of
simulation grids. The results are grids which are not only more
geologically accurate, and therefore better for reservoir modelling,
but also simulation friendly and suitable for accurate predictions of
production.
Reaching The Far Horizon
Horizon surfaces can be generated directly from interpreted seismic
data or calculated using well and thickness data. Truncation by
unconformities is handled precisely and accurately. The entire
stratigraphic modelling process can be done in a single step or as a
nested process. Integrated isochore modelling creates thickness
surfaces (isochores) from input data and a reference structural
model. Isochores may be calculated as true vertical thickness or true
stratigraphic thickness. Multivalued intrusion features, such as salt
domes, are easily modelled and included not only in the stuctural
framework but also in the grid. Roxar’s horizon modelling can utilise
zone logs to control the horizon surfaces and ensure that the
structural framework honours all the information from horizontal
wells, without the addition of pseudo data. As with the fault
modelling, there are QC tools to ensure the highest quality result.
To learn more please visit www.roxarsoftware.com or email
us on [email protected].
Modelling Fluid Fill
Roxar 2014
Improvements to Contact handling have been made in RMS to
resolve the issues arising from areas with varying contact levels.
Different regions can be defined based on the structural model and
these are used to map differing contacts in separate regions and
zones. These can be mapped accurately using structural maps or
cross sections.
ROXAR AS, GAMLE FORUSVEI 17, PO BOX 112, 4065 STAVANGER, NORWAY TELEPHONE +47 51 81 8800 FAX +47 51 81 8801 WWW.ROXAR.COM