
Originally Posted by
tenderheart bear
Part of the problem in any discussion on oil is the terms being used.
What's the difference between 'resource' and 'reserve'? Are people using reserve when they should be using resource? What's the difference between a recoverable resource and recoverable reserve? What does recoverable mean, and how does it change through time? Are these resources unconventional or conventional? How does that effect recoverability?
From my limited exposure to oil exploration, until everyone is clear on those terms and questions, any discussion is guarenteed to be a gong show.
Excellent observation. these terms are not well understood even in the industry.
While it is likely that there is a massive amount of oil in place Western US and Canada as well, much of the oil is likely to be difficult and very expensive to recover in the short term. I won't speculate on the "total hydrocarbons in place" meaning pretty much what it says, the total mass of hydrocarbons ( crude oil, gas and gas condensates). "Resources" is a term not well defined but generally refers to total hydrocarbons both in place and already recovered. Since this group of deposits make recovery difficult for reasons already discussed, total HC is far, far, far greater that what anybody estimates is recoverable. To make things worse once the easy stuff is recovered the harder stuff gets much much harder or even impractical even as methods improve. It's almost like a one shot deal so timing is very important.
Reserves on the other hand refer to HC with book value. In order to book a reserve, you must be able to show that the HC volume is something that you can be reasonably expected to get out of the ground with technology you have on hand.
"Estimated reserves" are just that .... ballpark estimates.
"Unproved reserves" are reserves that you can infer is there and can reasonably be expected to recover.
"Proved reserves" are reserves that are well understood and accounted for by some form of direct measurement without making any significant further investment to delineate it. The wells and equipment are likely in place to recover it, but further modifications are required to produce it.
"Recoverable reserves" are fully developed with no additional equipment required.
A well may penetrate a producible zone but is cased over so you cannot produce from it without modifying the well. These reserves are proved but not recoverable. A well may be able to produce from a zone but the gas has excessive sulfur and your equipment can't process it ... Not recoverable.
I have many views around the wisdom of developing resources but that will have to wait.