The University of Southampton
University of Southampton Institutional Repository

Deep-water massive sands: nature, origin and hydrocarbon implications

Deep-water massive sands: nature, origin and hydrocarbon implications
Deep-water massive sands: nature, origin and hydrocarbon implications
Deep-water massive sands (DWMS) are here defined as very thick (>1 m) sand beds or units that are devoid of primary sedimentary structures and that occur in association with other deep-water sediments — the massive sand facies association. Following careful examination of some 70 examples of massive sands drawn from deep-water successions of all ages and lithologies, we are confident that the shroud of mystery surrounding these deposits can be lifted, their origin and nature can be explained and their importance as hydrocarbon reservoirs can be brought sharply into focus.
Besides their very thick bedding and structureless aspect, key features of DWMSs are the common presence of water escape structures, subtle amalgamation surfaces and shale clasts. Typically they show poor to moderate sorting and compositional immaturity. The two key processes involved in their long-distance transport and emplacement are sandy debris flows (SDFs) and high-density turbidity currents (HDTs). Post-depositional liquefaction and sand injection can significantly affect either type. They generally occur as part of a thicker sand-dominated sequence or sand body (sand/shale ratios 7:1 to >9:1) fed from a clean sand and/or gravel-rich source. The variety of scales and geometries is dependent upon the depositional setting: chutes, scours, flow-slides and lobe sheets on smaller-scale fan-deltas; channel, ribbon and tongue-like bodies on open slopes and proximal fans; lobate and lensoid bodies more distally; and trough/basin sand bodies that are broadly lensoid to tabular. The process/facies type and depositional setting profoundly affect both the internal architecture and external geometry of DWMS bodies.
SEDIMENTS, DEEP WATER, HYDROCARBONS, FACIES, SEDIMENT TRANSPORT
0264-8172
145-174
Stow, D.A.V.
434350cd-0ae5-4bb3-b71f-e1da90587f74
Johansson, M.
32b32757-d424-4bad-89e5-757c35359198
Stow, D.A.V.
434350cd-0ae5-4bb3-b71f-e1da90587f74
Johansson, M.
32b32757-d424-4bad-89e5-757c35359198

Stow, D.A.V. and Johansson, M. (2000) Deep-water massive sands: nature, origin and hydrocarbon implications. Marine and Petroleum Geology, 17 (2), 145-174. (doi:10.1016/S0264-8172(99)00051-3).

Record type: Article

Abstract

Deep-water massive sands (DWMS) are here defined as very thick (>1 m) sand beds or units that are devoid of primary sedimentary structures and that occur in association with other deep-water sediments — the massive sand facies association. Following careful examination of some 70 examples of massive sands drawn from deep-water successions of all ages and lithologies, we are confident that the shroud of mystery surrounding these deposits can be lifted, their origin and nature can be explained and their importance as hydrocarbon reservoirs can be brought sharply into focus.
Besides their very thick bedding and structureless aspect, key features of DWMSs are the common presence of water escape structures, subtle amalgamation surfaces and shale clasts. Typically they show poor to moderate sorting and compositional immaturity. The two key processes involved in their long-distance transport and emplacement are sandy debris flows (SDFs) and high-density turbidity currents (HDTs). Post-depositional liquefaction and sand injection can significantly affect either type. They generally occur as part of a thicker sand-dominated sequence or sand body (sand/shale ratios 7:1 to >9:1) fed from a clean sand and/or gravel-rich source. The variety of scales and geometries is dependent upon the depositional setting: chutes, scours, flow-slides and lobe sheets on smaller-scale fan-deltas; channel, ribbon and tongue-like bodies on open slopes and proximal fans; lobate and lensoid bodies more distally; and trough/basin sand bodies that are broadly lensoid to tabular. The process/facies type and depositional setting profoundly affect both the internal architecture and external geometry of DWMS bodies.

Full text not available from this repository.

More information

Published date: 2000
Keywords: SEDIMENTS, DEEP WATER, HYDROCARBONS, FACIES, SEDIMENT TRANSPORT

Identifiers

Local EPrints ID: 8760
URI: https://eprints.soton.ac.uk/id/eprint/8760
ISSN: 0264-8172
PURE UUID: df2c5867-7629-41d1-9dd5-24c4dc4ab8ad

Catalogue record

Date deposited: 14 Sep 2004
Last modified: 17 Jul 2017 17:12

Export record

Altmetrics

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of https://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×