Hi psi81, just wondering if you think the silica plugging at...

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diggingyourselfintoahole

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19/06/19

01:15

Post #: 39122987
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Originally posted by psi81: ↑

Yes and quartzites are, by definition, full of this silica which fills and blocks all porosity, both intergranular and fractures. I suspect the Heavitree isn't a true quartzite in the metamorphic sense (which requires full recrystallisation of the grains) but rather a quartzose sandstone with near total cementation of porosity with diagenetic silica, but in reservoir terms the difference is pretty academic.

The only way there will be fracture porosity here at Dukas is if a fracture network has developed after the rock has already been turned into quartzite, and there hasn't been another major burial period or introduction of hot fluids after that.

It is possible and does happen but the chance is fairly low. I don't know enough about the burial history of the Amadeus to know if it's feasible, it would depend on the timing of burial and compressional or extensional events. I know there have been several of each since the time of Heavitree deposition so... maybe!

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Hi psi81, just wondering if you think the silica plugging at Mereenie is likely to be amenable to acid stimulation without fracking? Is this do-able in Australia - not sure if there are local limitations on what they are allowed to put down the well eg hydrofluric acid/HCl/sodium hypochlorite etc and whether the well drilled at Mereenie would be suitable. Would they have already tried this?

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Hi psi81, just wondering if you think the silica plugging at...

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