Vandromme, Rosalie (2007) Approche des mécanismes de l'injection sableuse per descensum. PhD thesis Dynamique et ressources des bassins sédimentaires, Centre de Géosciences, ENSMP p.250.

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Abstract

The outcrops of Bevons, Nyons and Rosans in south-eastern France, like the Numidian ones (Sicily, Tunisia,Morocco...) or Tourelle ones (Canada) are excellent spots for the observation of many sandy injectites supplied by turbiditic channels. Two types of injectites are present: sills (horizontal) and dykes (vertical), dykes resulting from sills. Depending on the authors, their creation processescan either be upward (per ascensum), postdepositonal, or, probably more often, downward (per descensum), contemporaneous of the sand feeder set up and object of this study. The study and the modeling the mechanisms at work in this fractured network has two major benefits. First, the ability to predict the hermeticity of the argillaceous materials, with the prospect of using them as waste storage sites. Second, since sandy injectites can be found between hydrocarbon-richreservoirs, they could help predict fluid circulations and cross-flows during the exploitation of those reservoirs.

A geometrical model has been established from the observation of the outcrops and has led to certain assumptions on the mechanisms being taken into account in the modeling of either the fracturings or the injections. Several approaches have been carried out in parallel:

- the study of the compaction of argillaceous sediments prior to injection

- the use of the hydraulic fracturing as injection mechanism

- the use of a yield stress fluid in a stochastic network (with probabilities adjusted so that the realizations are consistent with those actually observed)

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