RE: Geological round-up.12 May 2024 16:05
Caterham7
Posted in: PRD
Posts: 763
Price: 11.375
No Opinion
RE: Continuity, or not...29 Jun 2023 15:22
Mariachi - your comments regards turbidite continuity are largely incorrect.
Examples of sub-meter sands proven to be laterally continuous over many kilometres, are observable in both field outcrops and field well databases. Good examples can be read in this very nice paper, starting at bottom of page 37.
https://eprints.whiterose.ac.uk/131925/7/1-s2.0-S0264817218302551-main.pdf
You make two incorrect statements
1. “These are turbiditic sands and the thickness directly relates to the size of the event.”
2. “ plenty of sands to go after but individually small as not extensive laterally”
In reality, it is proven that turbidite thickness and lateral connectivity are controlled by the complex interplay of the following variables (rather than “the size of the event”)
1. Is the turbidite system sand rich (low efficiency) or mud rich (high efficiency). Remember that the finer grained sands generally found in thinner beds will travel further, ie, classic Bouma sequence.
2. The volume and energy of the turbidite flow (commonly referred to as the ‘stroke’)
3. Where abouts in the fan lobe are you measuring the thickness? A non-tabular turbidite bed will feather and thin toward the lobe margins.
4. How confined is the basin floor on which the turbidite is deposited? An unconfined basin will let the lobes spread laterally for great distances, resulting in better developed marginal thin-bed facies.
Lot of public domain literature on Google, giving many examples of thin bed turbidites with immense lateral continuity.
https://core.ac.uk/download/pdf/199293397.pdf
https://spiral.imperial.ac.uk/bitstream/10044/1/82011/3/Puasa-I-2018-PhD-Thesis.pdf
If you want to better understand the geology of turbidites, I highly recommend exploring the extensive outcrops of Arnot Basin (France), Tabarnas Basin (Spain), and Karoo Basin (South Africa). I have taught Turbidite field classes in all locations, and I used to teach classes in deep-water depositional systems for a major oil company whose logo is the Pecten Shell.
Apologies for my extended absence from this BB. I was involved in a horrific car crash (not my fault) in April. Fifteen broken bones, cranial fracture, and seven weeks in hospital. Still house bound. Following my investments seemed rather irrelevant. Still holding all my PRD shares, and happy to leave BB in Keith’s capable hands.
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