1. Yes, fraccing can help naturally fractured reservoirs because...

1. Yes, fraccing can help naturally fractured reservoirs because it helps the wellbore intersect more fractures, but if the reservoir is already nicely fractured it may not be necessary

2. Yes, low porosity and permeability are the main factors influencing the choice of fraccing

3. The combination of low porosity and limited natural fracturing definitely makes a prospect unproductive, in that situation you have a shale play and the success or failure of the play is dependent on being able to frac it effectively

4. No, it just means it's a large structure

Palm Valley is already extensively fractured and you can see it in the surface expression. You see long lines of shrubs criss-crossing the landscape at 90 degrees to each other, growing in the fractures. It's quite impressive to see. Whether the fracturing is as extensive in the deeper targets I don't know and that will determine whether the PV Deep well needs a horizontal frac or just a horizontal.

Your questions are more relevant to Ooraminna where the reservoir is tight and there appears to be some natural fracturing, but the two wells drilled to date have had difficulty intersecting them. That might be a situation where fraccing might help connect up the natural fractures.