They have been drilling for oil around here since at least the 1950's. I found that out earlier this year when I did a bit of research on the subject. The bore hole closest to me produced gas & oil (without fracking), but not (at that time) in commercial quantities. It was however significantly, the first to produce Jurassic oil onshore in this country.
More info here....
https://ogauthority.maps.arcgis.com/...545d222e57ddaa
And here ……….
https://ukogl.org.uk/
So they know for certain what's down there and how much it will produce. I'm am unable to determine from Google what they will get from undertaking aerial surveys, perhaps someone in the know
, could enlighten me.