IPR for Trinidad7 Jan 2024 09:40
I expect the CPR for Cory-Moruga this week, as a taster here is an IPR - Incompetent Person's Report - which may give some background to what we could see.
Trinidad has been an interesting location for the last couple of hundred million years. About 150 Ma (million years ago) the North & South American tectonic plates separated, forming the Gulf of Mexico - poor little T & T was left hanging on to the outer edge of the S American plate. For the next 100M years or so it was the Cretaceous period, with lots of organic material deposited in warm shallow seas. Then around 80 Ma, the South American plate split from the African Plate, forming the South Atlantic Ocean (N. Atlantic formed earlier) and once again T & T was left on the outermost corner of its plate. Continuing tectonic movement caused slumping and rifting, with the organic-rich Cretaceous rocks becoming deeply buried, forming a vast hydrocarbon kitchen. I mean VAST. Have a look at this resource map I have posted on Twitter -
https://twitter.com/KQuick20704342/status/1743909817155309710/photo/1
- you can see that Trinidad is at the intersection of the prolific Western Atlantic Margin (Guyana/Suriname Basin), and the Eastern Venezuelan Basin. Venezuela has more oil than any country on earth - more than the KSA. So why is it not a super-rich nation? - the answer is political - Venezuela is in effect a failed state.
Anyway, back to the history. Around 30 Ma, huge influxes of sand from what is now the middle part of Trinidad flowed southwards underwater into a large rift, forming extensive turbidites. These are now called the Herrera Sands. Then during The Miocene (23 - 5 Ma) and Pliocene (5.4 - 2.4 Ma), a series of compressive events occurred as the Caribbean and S. American tectonic plates squeezed together. This caused extensive faulting, folding and even thrusting (sorry, it means something different in geology - thrusting is where one sequence of rock strata gets pushed up over itself, so that you get a repetition of the same rocks - in some Trinidad locations you can drill vertically through the same oil reservoir twice). The main structure beneath the SW Trinida peninsula is the Los Bajos Fault. which runs WNW - ESE, and acts as the feeder from the deep oil kitchen up to the network of lesser faults that run up into the Herrera Sands reservoirs. These reservoirs include anticlines, fault closures, thrust/fault closures, plus the occasional salt diapir. Cory Moruga is just to the NE of the Los Bajos Fault.
The oilfields surrounding Cory-Moruga have been tapped for decades, and are now largely depleted - they need CO2EOR, but that's another story. I have dug up some MEEI data from when these field were in their youth - 1992. Moruga E, W & N -79K Bbl per year, 13.5 MMBbl cumulative from start. Plus Penal-Barrackpore just to the North - 1096K Bbl per year, 101MM Bbl since start. All these fields still produce.