1999 Conference Abstracts

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1999 Abstract: Martinius et al.

Multi-Scale Characterization and Modeling of Heterolithic Tidal Systems, Offshore Mid-Norway

Allard W. Martinius, Philip S. Ringrose, Arve Næss
Statoil Research Centre
7005 Trondheim  Norway

Renjun Wen
Geomodeling Research Corp.
30, 840-6th Avenue SW
Calgary T2P 3E Canada


The Lower Jurassic Tilje Formation on the Halten Terrace, offshore mid-Norway, forms an important reservoir in a number of hydrocarbon fields. A high volume fraction (80 percent) of the formation is heterolithic in nature, showing various styles of sandstone-mudstone intercalated bedding at several scales. The depositional model is based on a general facies classification scheme applicable to all fields. The stratigraphic interval discussed was deposited in a narrow basin during overall rising relative sea level as a tide/wave-dominated, mud-rich delta with well-developed prodelta, delta-front, and estuarine-type distributary- channel facies. The main heterolithic deposits are found in the prodelta, delta-front, and distal parts of the estuarine- type distributary-channel-mouth areas, whereas relatively "clean" facies occur in medial areas of these distributaries.

Lithofacies associations are modeled in 3D using stochastic, object-based methods, and the heterolithic architecture at the lithofacies scale is modeled using a process-based sedimentary architecture tool. Multiple data sources (core, log, and outcrop-analogs) are used to establish a data-rich procedure for estimating the effective reservoir properties within a step-wise upscaling procedure. Our results show the importance of integrating multi- scale data with good sedimentary models to accurately estimate reservoir properties in these heterolithic formations. We derive effective property functions (for example kv/kh) for different facies and identify important reservoir flow units using flow simulations of stochastic realizations.