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Journal of the Geological Society; 2003; v. 160; issue.3; p. 495-496;
DOI: 10.1144/0016-764902-155
© 2003 Geological Society of London

Discussion on mechanisms and controls on the formation of sand intrusions

D.M.D. James, R.J.H. Jolly & L. Lonergan

Penparc, Cwmystwyth SY23 4AG, UK (e-mail: davidmd.james@ virgin.net) BP Exploration, Chertsey Road, Sunbury-on-Thames, Middlesex, TW16 7LN, UK (e-mail: jollr1@bp.com) Department of Earth Science & Engineering South Kensington Campus, Imperial College London, London SW7 2AZ, UK (e-mail: l.lonergan@ic.ac.uk)



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  		Fig. 1.  Pressure–depth plots relating to the mechanics of sand intrusion. (a) Diagram illustrating the build up and decline of pressure during propagation and cessation: note that the fluid pressure gradient during intrusion, which determines the elevation difference between source and sill, is not hydrostatic. (b) Diagram illustrating how the variables of source-bed pressure decline (P) and the instantaneous dynamic gradient of the injecting slurry (F) yield a vector which determines the sill position.