Large-scale Sand Injection in the Paleogene of the North Sea: Modeling of Energy and Flow Velocities
Published:January 01, 2007
Davide Duranti, 2007. "Large-scale Sand Injection in the Paleogene of the North Sea: Modeling of Energy and Flow Velocities", Sand Injectites: Implications for Hydrocarbon Exploration and Production, Andrew Hurst, Joseph Cartwright
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Large-scale injection complexes, which border many Paleogene deep-water sandstone accumulations in the North Sea, are modeled as emplaced in a single phase by sand fluidization into preexisting fractures and as extruding on the sea floor. The energy involved in the emplacement of the large-scale dikes and extrusions is at least in the order of 1013 J and is mainly expended when lifting the large mass (3.1 × 1011 kg) of granular material and fluid. Minor amounts of energy are dissipated as frictional effects. The flow velocity at the exit point on the sea floor is calculated to...
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Sand Injectites: Implications for Hydrocarbon Exploration and Production
Sand injectites are described in scientific literature as an increasingly common occurrence in hydrocarbon reservoirs, in particular in deep-water clastic systems, where they are known to influence reserves distribution and recovery. Seismically-detectable injected sand bodies constitute targets for exploration and development wells and, subseismic sand bodies provide excellent intra-reservoir flow units that create field-wide vertical communication through depositionally extensive, low-permeability units. As sand injectites form permeable conduits in otherwise low-permeability units they facilitate the expulsion of basinal fluids; hence they act both as a seal risk and mitigate timing and rate of hydrocarbon migration. Injected sand bodies form intrusive traps, which are distinct from structural or stratigraphic traps. Included in this publication are 10 chapters on subsurface examination of sand injectites, 1 chapter on theoretical considerations, and 13 outcrop analogs in reservoirs across the world. Captured in this volume is at least a taste of the global and stratigraphic distribution of sand injectites, and an attempt to introduce readers to sand injectites and their significance in the context of hydrocarbon exploration and production. The book is not intended as a complete review of the field-based literature, but emphasizes high quality case studies from the surface and subsurface. The geographic scope of the book is large, and illustrates the diversity of geological settings in which these fascinating and economically significant features are found.