RE: Guercif Basin and the hot kitchen4 Nov 2023 02:44
Since the TDFI is approaching the 50% level, may I add a few comments to this highly interesting thread started by our friend Seabright on 15 Oct 2023 19:49? I suspect what I have to say will push the Indicator into crisis mode. I suggest you first re-read Seabright's post, key sentence: "Yes it’s huge, it’s all connected by major deep faults and it’s very hot in the kitchen", then consider GRH's short but to the point view repeated yesterday: "It's all BIG. It's all CONNECTED".
You will quickly appreciate that to form hydrocarbons, you need heat + organic material.
🦕 Heat
Some may be asking what is the heat in the kitchen all about? For the organic material in sediments to turn into oil, it needs to be 'cooked' at around 60-175°C - this is the 'oil window'. Gas is cracked from oil at around 175-225°C - the 'gas window'. This usually happens at considerable depth within the Earth's crust. I have posted a couple of charts on X:
https://twitter.com/KQuick20704342/status/1720617262783008771
showing the window temperatures at normal depths, plus a map showing the rather exceptional conditions around Guercif. How exceptional? I dug up this rather obscure paper showing a staggering 110°C per km depth just NE of Guercif.
http://www.lovegeothermal.org/pdf/IGAstandard/WGC/2010/1162.pdf
My view is that because of the high temperatures at shallow depths, we will see mostly gas rather than oil - this is good, since there is no functional oil infrastructure (pipeline, etc) in Morocco, and the only oil refinery has been mothballed for years. We wouldn't want an oil asset that is potentially stranded.
🦕 Organic material
Basically dead plant & animal matter deposited along with the other stuff making up sediments - usually expressed as %TOC (total organic carbon). Here's some info from a scientific paper that's also referenced in the PRD 2022 CPR under S. 4.1.2 - Source Rocks: p.1478 of Beauchamp, W. 1996 (very long link, suggest you just Google it) :
"Pliensbachian source rocks yield total organic carbon values between 1.66 and 3.87%" and "Maastrichtian source rocks yield high total organic values ∼18% and have excellent potential for generating hydrocarbons"
🦕 How much gas?
A useful rule of thumb is that for every 1% TOC, 1km³ of source rock will yield 3-12 BCM of methane (= 105-420 BCF). I'm not going to do this sum, for fear of ending up in the same loony bin as GRH if he reveals how much gas he thinks there is around Guercif. Why not assume the Guercif graben is 15 x 50km (it's bigger), with sediments 5km deep (they're deeper), with a TOC of 1% (it's more).
In the next couple of weeks, we will have confirmation whether all this gas has been trapped (it has) and can be flowed economically (it will) and if someone is prepared to buy it (they will).
Everything (in brackets) is my own view, you should not consider it reliable information on which to base an investment.
See you in the fun