EXPLORATION • DRILLING • FIELD SERVICES
Paleo-depositional reconstruction of the study field
MODELLING
eservoir geomodelling is an effective tool in exploration, development or even during production for studying geological stages of
any field lifecycle. Improvements in algorithmic logic of subsurface parameters is the key in achieving greater accuracy in delineating potential prospects and/or fields. Keeping this in mind, Dimension Strata has developed an advanced 3D geomodelling system in-house, using its own 3D geomodelling software, OrbStrata. Te system was put into test and has successfully performed in several prominent oil/gas fields; the latest being a gas field in Brunei Darussalam, in which
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Dr AKM Eahsanul Haque details a pioneering approach to determining potential geobodies beneath our feet
FACIES PALEO-TREND R
the advanced 3D geomodel achieved a staggering zoomed-in capability of down to 502m zone per grid cell without loss of resolution of the cell grids, thereby enabling identification of previously undetected/ unexplored potential zones of interest. Te study was deliberately performed
with a very limited dataset to test with only a single 3D seismic depth cube and one geological report, and the geomodelling algorithm was accurately able to delineate probable structural features and prospective depositional geobodies within the field. Two-phase approaches were used for the study; construction of a structure having lithological characteristics, followed by
Facies Paleo-Trend Modelling (FPTM) of the modelled geobodies to simulate the interpreted layers within the 3D model. In the context of this study, a novel stochastic method was used along with a proprietary algorithm that provided a considerably improved structural framework as well as the 3D facies framework of the field. Te study combined volume-based modelling (VBM) with Dimension Strata’s 3D seismic interpretation and reservoir geomodelling system, in which amplitude anomaly-based seismic interpretation is used and amplitude anomaly factor (ANF) is employed in determining different amplitude classes for specific horizons
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