Search found 658 matches

by GuyM
Tue Nov 23, 2021 3:18 am
Forum: Oil and Gas Exploration
Topic: longitude and latitude in SEG Y headers?
Replies: 9
Views: 2875

Re: longitude and latitude in SEG Y headers?

That's a start. You can dump the headers to an ASCII file along with CDP or SHOT, ad then use proj to project them to easting/northing for loading. Only slight wrinkle is you'll have to guess the Geodetic datum, which can give couple of hundred metres error unless it's in a report somewhere. WGS84 i...
by GuyM
Tue Nov 16, 2021 11:10 pm
Forum: Oil and Gas Exploration
Topic: longitude and latitude in SEG Y headers?
Replies: 9
Views: 2875

Re: longitude and latitude in SEG Y headers?

Where are you expecting to be in the world? Are those actually lat-longs in deg-min-sec or decimal degrees?
If the answer is Yemen (45W, 15N) then you''ll still need to do some detective work..
by GuyM
Sun May 02, 2021 2:13 am
Forum: Oil and Gas Exploration
Topic: Seismic survey ships at $20m each?
Replies: 2
Views: 1089

Re: Seismic survey ships at $20m each?

Well, I was thinking more about how Shearwater came into existance when Dolphin went under, but sure
Article suggests they will retire some of their older fleet. Diamond and Emerald are both early 1990s vintage, and the Eagle is late 1990s.
by GuyM
Thu Apr 29, 2021 1:39 pm
Forum: Oil and Gas Exploration
Topic: Seismic survey ships at $20m each?
Replies: 2
Views: 1089

Seismic survey ships at $20m each?

"Shearwater has acquired streamers and related seismic equipment for a total cash consideration of $50 million. The company further purchased six seismic acquisition vessels for $127.5 million, Shearwater informed." Polarcus made use of the Ultsein X-bow design for their ships, which uses ...
by GuyM
Mon Apr 19, 2021 1:56 am
Forum: Oil and Gas Exploration
Topic: If you want to have technical talk, what would you choose?
Replies: 3
Views: 1332

Re: If you want to have technical talk, what would you choose?

Ah - understood

I think anisotropic PreSDM is one area, but at a point it's usually an incremental improvement along the DMO-PreSTM-PreSDM pathway.
Potentially Full Waveform Inversion might be more interesting, as its really taking things in a different direction.
by GuyM
Sat Apr 17, 2021 8:21 pm
Forum: Oil and Gas Exploration
Topic: If you want to have technical talk, what would you choose?
Replies: 3
Views: 1332

Re: If you want to have technical talk, what would you choose?

I'd suggest some kind of cross-over. That is to say how seismic processing is interpretative, and knowledge of processing aids in interpretation. Some examples might be : - how residual statics can introduce or modify structure - the impact of velocity errors on migration and structure - multiples (...
by GuyM
Wed Mar 24, 2021 4:21 am
Forum: General Geophysics and Geoscience
Topic: Possible Nobel Prizewinning Discovery
Replies: 6
Views: 2616

Re: Possible Nobel Prizewinning Discovery

Well being able to model all of the previous reversals that are preserved in the geological record would validate your model.
You'd still need to get the work published in a peer-reviewed journal to gain traction and recognition, however.
by GuyM
Fri Mar 19, 2021 1:33 am
Forum: General Geophysics and Geoscience
Topic: Possible Nobel Prizewinning Discovery
Replies: 6
Views: 2616

Re: Possible Nobel Prizewinning Discovery

You can say that's not Nobel prize worthy, but all the people who have dedicated their lives to solving the major puzzle in whatever field of science they've chosen would probably disagree with you. I know some of the team that found the "new" continent of Zeelandia and while that got the...
by GuyM
Sat Feb 06, 2021 4:51 pm
Forum: General Geophysics and Geoscience
Topic: The Riddle of the Great Chilean Earthquake
Replies: 4
Views: 1953

Re: The Riddle of the Great Chilean Earthquake

I'm tried of theoretical discussions. I'm also not very interested in attacks on other people's opinions, for similar reasons. I'd like to see a falsifiable hypothesis, and the statistically robust experimental or modelling work done to demonstrate it's validity, rather than a theoretical refuting o...
by GuyM
Sat Feb 06, 2021 4:32 pm
Forum: General Geophysics and Geoscience
Topic: Scientists offer possible explanation for how oil and gas activity may have triggered Dallas earthquakes
Replies: 3
Views: 2341

Re: Scientists offer possible explanation for how oil and gas activity may have triggered Dallas earthquakes

I'm curious as to how well the modelling from your approach matches up with the observed data when it comes to induced seismicity. The Oklahoma data would be of particular interest, as that shows a rise and then fall in monitored quakes. I'm also curious about whether your approach could be used to ...
by GuyM
Fri Feb 05, 2021 11:04 pm
Forum: Oil and Gas Exploration
Topic: Another one bites the dust
Replies: 0
Views: 1167

Another one bites the dust

https://gcaptain.com/polarcus-to-cease-operations-and-terminate-all-employees/ There were some cool pictures on LinkedIn showing the ship-track from one Polarcus vessel spelling out the word "bye" Real shame - they were hugely innovative, with the Ulstein X-bow design and their commitment ...
by GuyM
Fri Feb 05, 2021 11:00 pm
Forum: General Geophysics and Geoscience
Topic: The Riddle of the Great Chilean Earthquake
Replies: 4
Views: 1953

Re: The Riddle of the Great Chilean Earthquake

The question to the respected geophysicists of the forum: Have I bored you with my articles on seismology yet? I think mostly the forum posts here tend to be about answering more practical applied exploration geophysics questions rather than theoretical seismology discussions; that's the majority o...
by GuyM
Wed Jan 27, 2021 3:09 am
Forum: General Geophysics and Geoscience
Topic: Thermonuclear Fusion, as a Source of Seismic Phenomena?
Replies: 16
Views: 4045

Re: Thermonuclear Fusion, as a Source of Seismic Phenomena?

Therefore, if we were dealing with the natural process of radiolysis, then the radioactive background and the percentage of helium and radon would be unchanged. The data may say more gas, but that does not imply fusion. Just gas escaping from liquids under pressure, or though cracks and fault lines.
by GuyM
Tue Jan 26, 2021 3:57 pm
Forum: General Geophysics and Geoscience
Topic: Thermonuclear Fusion, as a Source of Seismic Phenomena?
Replies: 16
Views: 4045

Re: Thermonuclear Fusion, as a Source of Seismic Phenomena?

So you are suggesting that Radon and Helium are a result of fusion and not nuclear decay sequences?
by GuyM
Mon Jan 18, 2021 3:28 am
Forum: General Geophysics and Geoscience
Topic: Attack of the bots?
Replies: 2
Views: 1166

Re: Attack of the bots?

admin wrote: Sun Jan 17, 2021 10:59 pm There might be a small group of people trying to test the forum, but they don't look like bots. We certainly don't encourage this kind of posts and the situation is monitored.
That's great; just seemed a bit, well weird.
by GuyM
Sun Jan 17, 2021 7:30 pm
Forum: General Geophysics and Geoscience
Topic: Attack of the bots?
Replies: 2
Views: 1166

Attack of the bots?

So - Some odd patterns in the discussion here, where a newly registered user provides the answer to an old question, sourced from another website https://detectation.com/forum/viewtopic.php?f=18&t=762&p=12951#p12951 https://detectation.com/forum/viewtopic.php?f=2&t=788&p=12950#p12950...
by GuyM
Mon Jan 11, 2021 2:30 pm
Forum: General Geophysics and Geoscience
Topic: Nature and Energy of Earthquakes or Seismology for Dummies
Replies: 17
Views: 4684

Re: Nature and Energy of Earthquakes or Seismology for Dummies

To me that's the yardstick for any new theoretical or modelling approach - the modelled results from that approach have a better (statistical) fit with the observations we make. Without that you don't have a hypothesis that is falsifiable or indeed that can be tested.
by GuyM
Sat Jan 09, 2021 10:09 pm
Forum: General Geophysics and Geoscience
Topic: Nature and Energy of Earthquakes or Seismology for Dummies
Replies: 17
Views: 4684

Re: Nature and Energy of Earthquakes or Seismology for Dummies

Fully agree we haven't mastered gravity because we don't understand it; the models we have still allow us to make extensive use of gravity in exploration, whether that's sub-surface, remote sensing via satellite or sending probes to the far reaches of the solar system. In that sense the predictive m...
by GuyM
Sat Jan 09, 2021 1:57 am
Forum: General Geophysics and Geoscience
Topic: Nature and Energy of Earthquakes or Seismology for Dummies
Replies: 17
Views: 4684

Re: Nature and Energy of Earthquakes or Seismology for Dummies

Only by knowing the source of energy can the mechanism of seismic phenomena be constructed, and knowing the mechanism, it will already be possible to speak about some kind of forecast. I'm not entirely onboard with that. Mostly its the other way round - we develop some form of empirically-derived m...
by GuyM
Thu Jan 07, 2021 2:05 am
Forum: General Geophysics and Geoscience
Topic: Nature and Energy of Earthquakes or Seismology for Dummies
Replies: 17
Views: 4684

Re: Nature and Energy of Earthquakes or Seismology for Dummies

"If we admit that earthquakes cannot be predicted, then we will have to resign and admit the fact that we have spent many years on a chimera. Do we need this? No! Therefore, we will tear with our teeth everyone who goes against us." That's not really how science works where I am! You only ...
by GuyM
Thu Jan 07, 2021 1:58 am
Forum: General Geophysics and Geoscience
Topic: Nature and Energy of Earthquakes or Seismology for Dummies
Replies: 17
Views: 4684

Re: Nature and Energy of Earthquakes or Seismology for Dummies

Remember, earthquake prediction is impossible !!! I don't know any seismologists who claim to be in the quake prediction business; forecasts and models, perhaps, but not predictions. Liej the meteorologists, they choose their words carefully and with good reason - eyes on what happened in Italy. Wa...
by GuyM
Fri Jan 01, 2021 4:32 pm
Forum: General Geophysics and Geoscience
Topic: Nature and Energy of Earthquakes or Seismology for Dummies
Replies: 17
Views: 4684

Re: Nature and Energy of Earthquakes or Seismology for Dummies

I've imaged the subducting tectonic plate that eventually pushes under my house. Sometimes that plate gets stuck, until it jumps free. Sometimes hydrothermal fluids in the subducting slab force themselves upwards under pressure. Sometimes there are slow-slip events that reduce the stress. That's all...
by GuyM
Fri Jan 01, 2021 3:51 pm
Forum: General Geophysics and Geoscience
Topic: Thermonuclear Fusion, as a Source of Seismic Phenomena?
Replies: 16
Views: 4045

Re: Thermonuclear Fusion, as a Source of Seismic Phenomena?

I'm unsure what you mean by "trust these numbers"? Every measurement - direct or indirect - has a limiting accuracy based on a range of constraints, and velocity analysis is no exception. Manual analysis is one thing, however when you start to get into semi-automatic high density velocity ...
by GuyM
Fri Jan 01, 2021 12:02 am
Forum: General Geophysics and Geoscience
Topic: Thermonuclear Fusion, as a Source of Seismic Phenomena?
Replies: 16
Views: 4045

Re: Thermonuclear Fusion, as a Source of Seismic Phenomena?

"Everything that we know from the results of testing rock samples should be forgotten like a bad dream because we can apply Young's modulus only to isotropic samples of small size." Well, we see the self-same issues with measuring seismic velocities from core (or using sonic logs) and the ...
by GuyM
Thu Dec 31, 2020 7:13 pm
Forum: Oil and Gas Exploration
Topic: Meaning of "X = NOTHING Y = EASTING"
Replies: 2
Views: 1337

Re: Meaning of "X = NOTHING Y = EASTING"

Hopefully it says NORTHING rather than NOTHING? Normally you would have X as the EASTING coordinate and the Y as the NORTHING; maps usually have north pointed along the Y-axis. That's a left-handed dataset - if you hold up your left hand and stick out your forefinger and thumb in an L shape, then yo...