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Deep-water marine reservoirs (view source)
Revision as of 14:42, 17 August 2015
, 14:42, 17 August 2015→Deep-water marine reservoirs can be prolific reservoirs
Deep-water marine sandstones can be prolific reservoirs where they occur. They commonly contain oil fields as a result of the interfingering of gravity-flow sandstones with marine oil-prone source rocks. An example is the interfingering of the Upper Jurassic submarine fans of the UK North Sea with the Kimmeridge Clay Formation source rock for the province, e.g., the Magnus and Claymore fields (Shepherd et al., 1990; Harker et al., 1991).
Deep-water marine sandstones can be prolific reservoirs where they occur. They commonly contain oil fields as a result of the interfingering of gravity-flow sandstones with marine oil-prone source rocks. An example is the interfingering of the Upper Jurassic submarine fans of the UK North Sea with the Kimmeridge Clay Formation source rock for the province, e.g., the Magnus and Claymore fields (Shepherd et al., 1990; Harker et al., 1991).
The reservoir quality of deep-marine sandstones is among the best of the various sedimentary environments that comprise reservoirs. Porosities, permeabilities, and net-to-gross ratios are typically high. Under favorable conditions, deep-water sandstones may be ponded and stacked vertically into very thick, sand-rich intervals (Table 30). These reservoirs are very profitable as they can be produced by a small number of wells at very high rates (Weimer and Slatt, 2004).
The reservoir quality of deep-marine sandstones is among the best of the various sedimentary environments that comprise reservoirs. Porosities, permeabilities, and net-to-gross ratios are typically high. Under favorable conditions, deep-water sandstones may be ponded and stacked vertically into very thick, sand-rich intervals (Table 1). These reservoirs are very profitable as they can be produced by a small number of wells at very high rates (Weimer and Slatt, 2004).
{| class=wikitable
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|+ {{Table number|1}} Factors influencing connectivity and reservoir development in deep-water marine reservoirs.
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! Characteristic || Favorable for Reservoir Development || Unfavorable for Reservoir Development
|-
| Under favorable conditions, deep-water marine sandstones can form very thick, high net-to-gross reservoirs || Produce at high rates with high ultimate recovery; can provide reservoirs for very profitable fields ||
|-
| Depositionally isolated channel-fill sandstones in channelized systems || || Create compartmentalized reservoirs requiring a multiwell development scheme
|-
| Widespread amalgamation of channel-fill sandstones in channelized systems || Creates laterally and vertically connected high-volume reservoirs ||
|-
| Shale drapes or late-stage channel-fill shales common in channel-fill sandstones || || Reduces vertical and lateral connectivity between individual channel-fill sandstones
|-
| Preferential water ingress along channel axes || || Banked oil may form along channel margins
|-
| Levee sediments are commonly in poor communication with the channel-fill sandstones in channel-levee complexes || || Bypassed oil in levee sediments
|-
| Levee sediments in channel-levee complexes are thin bedded but can show reservoir connectivity across a large area || Levee sediments can be a production target in their own right
|-
| Laterally extensive mudstones commonly form permeability barriers to vertical flow || Encourages edge-water drive and can suppress early water production || Creates hydraulic units; water overrun is common
|-
| Fill and spill geometries || || Potential to create bypassed oil volumes in cellar oil accumulations
|}
==Typical settings for deep-water marine reservoirs==
==Typical settings for deep-water marine reservoirs==