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Geological Society, London, Special Publications; 2006; v. 254; p. 289-300;
DOI: 10.1144/GSL.SP.2006.254.01.15
© 2006 Geological Society of London

Extrusive sandstones (extrudites): a new class of stratigraphic trap?

Andrew Hurst1, Joseph A. Cartwright2, Mads Huuse2 & Davide Duranti1

1 University of Aberdeen, Department of Geology & Petroleum Geology, Kings College, Aberdeen AB24 9UE, UK
2 3D Lab, School of Earth, Ocean and Planetary Sciences, Cardiff University, Main Building, Park Place, Cardiff CF10 3YE, Wales, UKwww.3dlab.org.uk

(e-mail: a.hurst{at}abdn.ac.uk)

(e-mail: joe{at}ocean.cf.ac.uk)

(e-mail: m.huuse{at}earth.cf.ac.uk)

Extrusive sandstone bodies are identified as entirely stratigraphic traps associated with sand injectites. They may be difficult to recognize but have four-way dip closure and are invariably connected through underlying lower permeability strata to parent sandbodies by sandstone dykes or transgressive sills that belong to sand injectite complexes. Extrusive sandstones (extrudites) constitute an immature exploration target, which is largely untested by deliberate exploration wells. Using seismic data alone, the distinction between extrudites and intrusive sills, and between extrudites and depositional sands, may be problematic. Sedimentological criteria may make differentiation possible when core is available. Extrudites are likely to have been drilled and misinterpreted as conventional deep-water turbidites within deep-water systems affected by sand injection.





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[Abstract] [PDF]