[First Hit]

Datapages, Inc.Print this page

Click to view article in PDF format (~0.8 mb). 

 

Previous HitReservoirNext Hit Modeling of Small-Scale Heterogeneities in Channelized Turbidite Systems: Digital Outcrop Studies of the Ross Formation, SW Ireland*

By

Cathrine Pedersen1, John Howell2, Trond Lien1,  Ellinore Bjørk Vipond1, John Thurmond1, Tore Løseth1, and Ole Martinsen1

 

Search and Discovery Article #40267 (2007)

Posted November 25, 2007

 

*Adapted from extended abstract prepared for presentation at AAPG Annual Convention, Long Beach, California, April -4, 2007

 

1Hydro Oil & Energy, Bergen, Norway ([email protected])

2University of Bergen, CIPR, Bergen, Norway

 

Abstract 

Deep-water channelized turbidite deposits represent architecturally complex hydrocarbon reservoirs, especially at the facies scale. Due to resolution of seismic and core/log-data, the population of coarse flow Previous HitsimulationNext Hit grid cells with realistic and effective permeabilities is a key challenge for Previous HitreservoirNext Hit modeling.  

Facies architecture data from outcrops bridge the scale gap between seismic data and well data. By building small (50x50x2-6m), detailed (>0.02m vertical resolution) and accurate facies-based Previous HitreservoirNext Hit models of outcrops (“Previous HitsimulationNext Hit cell mini-models”), it is possible to bridge the gap between core/log-data and field-scale Previous HitsimulationNext Hit models (Figure 1). The accurate representation of the facies architecture in these small-scaled models produces a geometric framework, within which sensitivity testing can be conducted.  

The models presented were built from the Carboniferous Ross Formation in County Clare, Ireland (Figure 2). Photorealistic mapping was used to create a virtual outcrop model from which the geometric data, necessary to create the structural framework for a series of Previous HitsimulationNext Hit cell mini-models, were extracted. The three-dimensional digital outcrop was supplemented by traditional section logging techniques and several 2-D ground-penetrating radar lines. All of the collected information has been included into the Previous HitreservoirNext Hit models, providing detailed 3D representation of the facies architecture within channel spillover-overbank deposits and channel fill deposits.  

The detailed models were subsequently upscaled to one single Previous HitsimulationNext Hit grid cell using different upscaling methods, which were then compared to each other. The results of this Previous HitstudyNext Hit produced effective permeability estimates and represent improved input values for the single Previous HitsimulationNext Hit grid cells in a larger-scale flow Previous HitsimulationNext Hit.

 

Figure and Table Captions

Figure1. Levels of sedimentological Previous HitreservoirNext Hit heterogeneity, showing the Previous HitSimulationNext Hit Cell Mini-model within a larger perspective in both a sedimentological and modeling perspective. A represents channel spillover / overbank deposits and B that of submarine channel fill. Left figure modified from the work of Weber and of Dreyer, with co-workers. Each Previous HitSimulationNext Hit Cell Mini-model is 50 x 50 meters, and range from 2 to 6 meters vertically.

Figure 2. Location map for County Clare, Ireland.

 

Selected Bibliography 

Dreyer, T., 1990, Sand body dimensions and infill sequences of stable, humid-climate delta plain channels, in North Sea Oil and Gas Reservoirs; II, Proceedings of the North Sea Oil and Gas Reservoirs Conference, p. 337-351.

Dreyer, T., 1992, Significance of tidal cyclicity for modeling of Previous HitreservoirNext Hit heterogeneities in the Lower Jurassic Tilje Formation, mid-Norwegian Shelf: Norsk Geologisk Tidsskrift, v. 72, p. 159-170.

Dreyer, T., 1993, Geometry and facies of large-scale flow units in fluvial-dominated fan-delta-front sequences, in Advances in Previous HitReservoirNext Hit Geology: Geological Society of London Special Publications. 69; p. 135-174.

Dreyer, T., 1993, Quantified fluvial architecture in ephemeral stream deposits of the Esplugafreda Formation (Palaeocene), Tremp–Graus Basin, northern Spain, in Marzo, M., and Puigdefabregas, C., eds., Alluvial Sedimentation: International Association of Sedimentologists Special Publication 17, p. 337-362.

Dreyer, T., Falt, L.-M., Hoy, T., Knarud, R., Steel, R., and Cuevas, J.-L., 1993, Sedimentary architecture of field analogues for Previous HitreservoirNext Hit information (SAFARI): a case Previous HitstudyNext Hit of the fluvial Escanilla Formation, Spanish Pyrenees, in Flint, S.S., and Bryant, I.D., eds., The Geological Modelling of Hydrocarbon Reservoirs and Outcrop Analogues: International Association of Sedimentologists Special Publication 15, p. 57-80.

Dreyer, T., and Wiig, M, 1995, Previous HitReservoirNext Hit architecture of the Cook Formation on the Gulfaks field based on sequence stratigraphic concepts, in Steel, R. J., Felt, V. L., Johannessen, E. P. and Mathieu, C., eds., Sequence Stratigraphy on the Northwest European Margin: Norwegian Petroleum Society Special Publication 5, p. 109-141.

Weber, K.J., 1986, How heterogeneity affects oil recovery, in Lake. L.W., and Carrol, Jr., H.B., eds., Previous HitReservoirTop Characterisation: Academic Press Inc., Orlando, p. 487-544.

Return to top.