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AK it's open to
"By definition, basement rocks cannot overlie younger sedimentary source rocks, and so hydrocarbons will not have migrated directly upwards into them, as occurs in a classic petroleum system. However, in areas where basement has been uplifted so that it is adjacent to a deep source, a migration pathway can exist either through the basement itself or through a carrier bed that connects the source rock to the basement. An alternative migration route could be from a source rock that is draped over the basement high, allowing hydrocarbons to be expelled directly into the basement underneath. "
THere's a graphic to support DSPP's own interpretations on migration of oil from adjacent source below the hill.
https://www.geoexpro.com/articles/2017/01/hiding-in-the-basement
*I did type "[open to] interpretation" but looks like I deleted the word before posting.
Wellwell,
"THere's a graphic to support DSPP's own interpretations on migration of oil from adjacent source below the hill.."
Yeah, OK, touche. But NOT below the aquifer!
:-)
Fractured basement hydrocarbon reservoirs are recognized worldwide, but they are relatively poorly understood and underexploited (Trice, 2014). In such plays, oil migrates laterally from an organic-rich source rock into a subsurface paleohigh of fractured crystalline basement, forming a so-called “buried hill” trap (Biddle and Wielchowsky, 1994). The seal is provided by a blanketing sequence of clay-rich mudstone.
Given the very low matrix permeability of most crystalline basement rocks, oil and other associated fluids are transported and stored via well-connected fracture systems. The geological characteristics of these fracture systems are not well understood because they are poorly imaged in seismic reflection data, and core samples are sparse. Critically, the processes involved in fluid transport and storage are also uncertain, although it is often assumed that migration into the basement high is primarily a passive process driven by the relative buoyancy of hydrocarbons following maturation at the source (e.g., Trice, 2014).
The less technical version from the website
https://www.hurricaneenergy.com/assets/basement-reservoirs
shedful,
"Critically, the processes involved in fluid transport and storage are also uncertain, although it is often assumed that migration into the basement high is primarily a passive process driven by the relative buoyancy of hydrocarbons following maturation at the source (e.g., Trice, 2014)."
Yes, well pointed out. A lot of the 'mechanisms' still require explanation, and it's quite possible that no generic model exists that applies in general terms between one FB reservoir and another. The same applies to 'conventional', of course, but these days it's fairly easy to recognise what sort of model a given conventional reservoir fits into, and then a wealth of past knowledge can be applied as how to best exploit it.
However, reverting to Dspp's graphic on Lemonfool, the suggestion that there is 'oil migration' taking place below the aquifer that provides the pressure drive on Rona is ipso facto absurd. And just before anybody really knowledgable starts quoting the huge W.Canadian Elmsworth gas fields where the gas is below the water, that's a different animal altogether!
Technical from the HUR website
https://www.hurricaneenergy.com/assets/technical-library
AD This is also important though I believe they HUR would have progressed their knowledge over the past 5/6 years regarding the cracks, but due to the Warwick which was Plugged and the rubbish knocked on by many about water cut these are the reasons why the SP is at where it is and it will take HUR drilling results to show they can accomplish what they say they can and move this company from an explorer to producer in peoples thinking then it will massively rerate IMO.
From the link on my post at 18:54.
Given the very low matrix permeability of most crystalline basement rocks, oil and other associated fluids are transported and stored via well-connected fracture systems. The geological characteristics of these fracture systems are not well understood because they are poorly imaged in seismic reflection data, and core samples are sparse.