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AAPG/GSTT HEDBERG CONFERENCE

Mobile Shale Basins – Genesis, Evolution and Hydrocarbon Systems”

June 4-7, 2006 – Port of Spain, Trinidad & Tobago

 

 

Clastic injectites: a comparative analysis of mud, sand and conglomerate injectites

 

Mads Huuse1, Richard J. Davies2, Steve Hubbard3, Joe A. Cartwright4, Andrew Hurst1

 

1Department of Geology and Petroleum Geology, University of Aberdeen

2Department of Earth Sciences, Durham University

3School of Earth Sciences, Stanford University

43Dlab, School of Earth, Ocean and Planetary Sciences, Cardiff University

 

 

Clastic injectites are a long-recognized but enigmatic type of geological structure straddling the fields of sedimentary and structural geology. They form by post-depositional remobilization and injection of clastic sediments and comprise remobilised, diapiric and injected masses of mud, sand, or, occasionally, conglomerate. Here, we show examples of deca- to hundred-metre scale mud, sand and conglomerate injectites in outcrop and km-scale mud and sand injectites seen in seismic data. Our comparative analysis serves to highlight their common occurrence, their similarities and differences in terms of geometries, fill and geological context in terms of: tectonic setting, host rock lithology, depth of burial of the injectite source bed(s), the (inferred) pressure conditions and absence or presence of hydrocarbons at the time of injection. A global database of observations would suggest that mud injections are more common in compressional settings, whilst sand injectites dominantly occur in deepwater slope and basin settings along relatively passive margins.

AAPG Search and Discovery Article #90057©2006 AAPG/GSTT Hedberg Conference, Port of Spain, Trinidad & Tobago