CIG   05423
CENTRO DE INVESTIGACIONES GEOLOGICAS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Virtual Outcrop Models and their Value for Building Geocellular Models: An Example from the Windermere Turbidite System (British Columbia, Canada)
Autor/es:
SCHWARZ, E., BUCKLEY, S.J., TERLAKY, V., HOWELL, J.A. Y ARNOTT, R.W.C.
Lugar:
Mar del Plata
Reunión:
Congreso; VII Congreso de Exploración y Desarrollo de Hidrocarburos; 2008
Institución organizadora:
Instituto Argentino del Petroleo y Gas
Resumen:
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ABSTRACT
A Virtual Outcrop Model (VOM) is a three-dimensional, photorealistic
representation of the exposed geology of a specific area, and consists of a georeferenced
digital terrain surface rendered with high-resolution imagery. This cutting-edge
technique is especially useful for outcrop studies where the extraction of
accurate geometric data is the primary objective. In addition, using a VOM, petroleum
geologists have the opportunity to study geobodies in a reservoir analogue from
different perspectives (3D visualization), to map and correlate key stratal surfaces,
and to compare the digital outcrop with other field data (e.g. sedimentary
logs, stratigraphic surfaces, outcrop gamma-ray logs).
A virtual outcrop also provides a revolutionary tool for building
outcrop geocellular models. A geocellular model is a computer-based
representation of a geological volume, which in most cases represents a
subsurface reservoir. An outcrop-based geocellular model is similar, but
constrained by outcrop data such as mapped surfaces and logs. The same software
that is routinely used in the oil industry to build subsurface reservoir models
can be adapted to manipulate data extracted from the VOM to build models of the
outcrop (e.g. RMS by ROXAR, Petrel by Schlumberger and GoCad by Paradigm). In a
typical workflow, stratigraphic surfaces are digitized in a VOM and exported
into RMS. Once recreated in 3D, these surfaces are used to define zones where lithofacies
and/or objects (geobodies) can be modeled. Lithofacies and geobodies are then used
to control the distribution of petrophysical properties within the model, which
can eventually be interrogated both statically and dynamically. Results from
these analyses can provide important insights and improve input variables to
build more realistic subsurface reservoir models.
In this contribution we present an innovative method for the
creation of a virtual outcrop model for strata of the Windermere Supergroup at
Castle Creek (west-central British
Columbia). The virtual outcrop model was created by
draping high-resolution aerial images onto a topographic model, and then
integrating this aerial dataset with ground-based laser scanning surveys of the
cliffs that were not clearly represented in the aerial imagery. The utility of
this VOM for subsurface studies is illustrated by the ability to show that
accurate geometric data can be extracted from the outcrop model and imported
into a reservoir modelling package. This aids in the recreation of zone
boundaries in an outcrop-based reservoir model of a seismic-scale
channel-levee system.