Thanks!!! I am looking for that by Steve Holditch but I get the idea from how you describe fracking as oil extracted directly from source rock, instead of from oil that has pooled from source rock.
With full disclosure, it technically is not from the source rock itself, which is typically a shale where kerogen is transformed to a volatile oil/gas over time and lots of temperature/pressure. Shales are just not brittle enough to ‘frac’. The unconventionals that are being fracced by the thousands are in more brittle zones immediately nearby these shales.
Conventional oils typically migrate a long way(maybe miles) prior to being trapped and are ‘buoyant’ or float on top of the water. Unconventionals do not need buoyancy and are in zones much less permeable so require fraccing.
Didn’t mean to spring too much technical jargon your way, but someone who knows more might draw exception to what I had insinuated previously.