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One Geoscientist
Denmark
เข้าร่วมเมื่อ 9 ธ.ค. 2020
Hi all.
As a geoscientist, I decided to share some of my ideas, knowledge, and experience in this TH-cam channel. I try to provide contents in which both students and professionals can benefit. I have been working in the mineral exploration industry as data analyst, geophysicist, and GIS officer for several years. Recently, I shifted my focus to hydrogeophysics.
If you have any enquiries, contact me by email.
Thank You & Good Luck!
Seyyed Reza Mashhadi
As a geoscientist, I decided to share some of my ideas, knowledge, and experience in this TH-cam channel. I try to provide contents in which both students and professionals can benefit. I have been working in the mineral exploration industry as data analyst, geophysicist, and GIS officer for several years. Recently, I shifted my focus to hydrogeophysics.
If you have any enquiries, contact me by email.
Thank You & Good Luck!
Seyyed Reza Mashhadi
ERT - Session 9: Some tips for the interpretation of resistivity and IP data
A few tips regarding the interpretation of ERT data
Share your interpretation tricks and tips that I have not mentioned in the video
You can download the presentation file here:
drive.google.com/file/d/1gyqyshwAw_xkmUnmZjgaFdhmOrWRYviZ/view?usp=sharing
If you have any enquiries, contact me by email.
Share your interpretation tricks and tips that I have not mentioned in the video
You can download the presentation file here:
drive.google.com/file/d/1gyqyshwAw_xkmUnmZjgaFdhmOrWRYviZ/view?usp=sharing
If you have any enquiries, contact me by email.
มุมมอง: 1 056
วีดีโอ
ERT - Session 8: Checking the reliability of ERT inversion results
มุมมอง 1.6K2 ปีที่แล้ว
A few tips regarding the reliability of ERT inversion results which is extremely important for all people who want to work on resistivity and IP tomography data You can download the presentation file here: drive.google.com/file/d/1WweZiUO06eX_Z1IO9hDDqH07DqMmZGkO/view?usp=sharing If you have any enquiries, contact me by email.
ERT - Session 7: Suitable Selection of Inversion Parameters
มุมมอง 1.7K2 ปีที่แล้ว
How can we select suitable inversion parameters? This is probably one of the most important videos in the ERT playlist. I have discussed the mentioned question in brief. I have also examined a few examples that would make you more interested in the topic. You can download the presentation file here: drive.google.com/file/d/1iuPl_BuAPQPhcbI-riQaG31xKH6y4wwF/view?usp=sharing The two main referenc...
ERT - Session 6: Understanding Inversion Procedure for Resistivity or IP Data
มุมมอง 6K3 ปีที่แล้ว
Describing inversion procedure in Res2dinv/Res3dinv in a simple approach without going deep into the mathematics You can download the Dr. Loke course notes for free from the following link: geotomosoft.com/coursenotes.zip You can download the presentation file here: drive.google.com/file/d/1qjt_nfLKoUFBlth1nAcHAgoQSOaMagf1/view?usp=sharing If you have any enquiries, contact me by email.
Exploring Moon and Mars with “Google Earth”
มุมมอง 1.2K3 ปีที่แล้ว
Don’t miss this amazing option. It is for the people interested in planetary science. Also, if you are a geologist / geoscientist, you will enjoy watching our bright MOON and our red friend MARS. (: I just showed some examples, you can explore for more. Here is a link to a paper about the red planet if you are interested to know more about our red neighbor, the mysterious Mars with its wonderfu...
Finding UTM zone with Google Earth
มุมมอง 14K3 ปีที่แล้ว
A brief note on Universal Transfer Mercator (UTM) coordinate system together with "how to find UTM zones easily in Google Earth" for any location. Don't forget to check other videos in my TH-cam Channel. If you have any enquiries, contact me by email.
Google Earth for Geoscientists - a few tips for Geologists, Geochemists, & Geophysicists
มุมมอง 1.9K3 ปีที่แล้ว
Watch the whole video if you are a Geologists, Geochemists, & Geophysicists. This overview discusses: 1. What kind of information can be extracted from google earth that can be useful for geoscientists? 2. How do we usually use google earth in our geoscientific surveys? 3. Is Google Earth useful for “large scale” surveys? 4. What is the greatness of Google Earth? Download the presentation file ...
3D Geological Map in Google Earth
มุมมอง 5K3 ปีที่แล้ว
This is a toturial to create 3D geological map in Google Earth. I really appreciate your support. It gives me energy to create more videos: 1. Please give me feedback. Write your comments, questions, ideas, etc. 2. Don't forget to "Subscribe". :) 3. If you enjoyed any of the videos, please press "like". If you have any enquiries, contact me by email.
Time Series Analysis by Google Earth (Historical Imagery Option)
มุมมอง 9903 ปีที่แล้ว
A few examples about the simple and effective use of historical imagery in Google Earth. This is just a quick and overall information that can be used in some cases, especially when there is no information available about the activities performed in the past. It is sometimes effective in geology / mineral exploration. Sometimes, it is also effective when the satellite data in a special area is ...
Planning Your Field Trip to Remote Locations by Google Earth
มุมมอง 1.7K3 ปีที่แล้ว
If you are a field crew, geologist, geophysicist, geochemist, etc. and you want to go to the field OR You want to go to remote locations for enjoying natural landscapes, etc. You will find it useful. Convert KML/KMZ to GPX format: www.gpsvisualizer.com/convert_input If you have any enquiries, contact me by email.
Quick Introduction to Res2dinv software
มุมมอง 22K3 ปีที่แล้ว
A quick introduction to Res2dinv software and its menu It is just a brief explanation as a necessity to get familiar with the software itself before starting some points regarding pre-processing, inversion, and interpretation of electrical resistivity and IP data in detail. If you don't have any data to import, look at the comments below to find out what to do. It is highly recommended to follo...
Effectiveness of Pseudo-Gravity Transformation in Mineral Exploration (my EAGE paper)
มุมมอง 2223 ปีที่แล้ว
It is a pre-recorded presentation of my paper for EAGE conference series (NSG2020). For those who are interested in mineral exploration and magnetic surveying. www.earthdoc.org/content/papers/10.3997/2214-4609.202020015 To Access & Follow My Publications: www.researchgate.net/profile/Seyyed-Mashhadi scholar.google.com/citations?user=42SLfsYAAAAJ&hl=en I hold online courses on Geosoft, ArcGIS, R...
Res2dmod Software Tutorial- Incorporation of topography into forward model
มุมมอง 4.6K3 ปีที่แล้ว
Electrical Resistivity Tomography (ERT) - from Zero to Hero How to work with Res2dmod to incorporate topography data This is an addition to Res2dmod learning in Session 5 by working with the most up-to-dated version. Since topography is an important factor, we showed how you can incorporate topography in resistivity forward modeling. Res2dmod free software is available at: www.geotomosoft.com/d...
ERT - Session 5: Forward Modeling of Resistivity Data with Res2dmod software
มุมมอง 8K3 ปีที่แล้ว
Electrical Resistivity Tomography (ERT) - from Zero to Hero Session 5: Forward vs. Inverse Modeling together with 2D Forward Modeling of Resistivity Data by Res2dmod - Forward Modeling vs. Inverse Modeling (Inversion) - Non-uniqueness - How to create Res2dmod input file - Working with Res2dmod software The presentation file is available at: drive.google.com/file/d/1kDbKhAlQmuFFCdEoP4go5MruZBxLq...
ERT - Session 4: Pseudo-section vs. Inverted Model
มุมมอง 5K3 ปีที่แล้ว
Electrical Resistivity Tomography (ERT) - from Zero to Hero Session 4: Pseudo-section vs. Inverted Model - Definition of resistivity pseudo-section - Pseudo-section for interpretation? - Some Examples of Pseudo-section for different arrays over identical structures - How Section (inverted/inversed Model) is different from Pseudo-section? "The captions / subtitle of this video is reviewed so you...
ERT - Session 3: Sensitivity Function & Depth of Investigation
มุมมอง 6K3 ปีที่แล้ว
ERT - Session 3: Sensitivity Function & Depth of Investigation
ERT - Session 2: Resistivity Surveying (Electrical Resistivity Method)
มุมมอง 18K3 ปีที่แล้ว
ERT - Session 2: Resistivity Surveying (Electrical Resistivity Method)
ERT - Session 1: Introduction to basic concepts
มุมมอง 9K3 ปีที่แล้ว
ERT - Session 1: Introduction to basic concepts
Electrical Resistivity Tomography (ERT) from Zero to Hero - Opening Session
มุมมอง 8K3 ปีที่แล้ว
Electrical Resistivity Tomography (ERT) from Zero to Hero - Opening Session
What is Oasis Montaj (Geosoft)? introduction together with a review of its amazing menus
มุมมอง 2.1K3 ปีที่แล้ว
What is Oasis Montaj (Geosoft)? introduction together with a review of its amazing menus
Create Topographic Map (DEM) by "Google Earth"
มุมมอง 43K3 ปีที่แล้ว
Create Topographic Map (DEM) by "Google Earth"
معرفی نرم افزار ژئوسافت Oasis Montaj Geosoft
มุมมอง 4803 ปีที่แล้ว
معرفی نرم افزار ژئوسافت Oasis Montaj Geosoft
آموزش تهیه نقشه توپوگرافی با نرم افزار گوگل ارث
มุมมอง 7K3 ปีที่แล้ว
آموزش تهیه نقشه توپوگرافی با نرم افزار گوگل ارث
Thanks a lot!
+Hi Reza, just a note on what a resistivity "contrast" is. For a 2-layer case (resistivity p1 for overburden, p2 for bedrock) it is the reflection coefficient i.e.(p2-p1)/(p2-p1). If this ratio is more than about 30, the resolution saturates and the method cannot distinguish between two high values of bedrock resistivity. So, paradoxically, the resistivity method is very sensitive to relatively small contrasts and insensitive to large ones. This applies to the modelling in 2D and 3D. In fact if you look at 1-D soundings, and increase the resistivity of the second layer, you will see it asymptotically approach a limit. The only way to see large contrasts is to use MT as 1D soundings or 2D profiles with FE inversion.
Hi Thank you for the comment. You probably meant (p2-p1)/(p2+p1)…? :) I am not a modeling guy but I get your point Distinguishing 10000 vs 100000 ohm meter interface should be difficult or maybe impossible (or 1 and 0.1 ohm.m interface when looking at conductive cases) and that can also be a reason that you also reach your measurement accuracy limits (?) and very low SNR But I of course consider common or usual cases that you usually face on the ground But good comment, thanks for sharing
@@OneGeoscientist Yes, well spotted! If the overburden (where the electrodes are emplaced) is 100 ohm-m, and the bedrock resistivity values on each side of a vertical contact below the overburden layer are 3,000 and 10,000 ohm-m, there will be no difference in the apparent resistivity measured on the surface above that contact. as both sides will be >= 30x the overburden resistivity. It is a function of the fractional current flow in the upper and lower media, not just measurement accuracy or SNR. This is actually a fairly common situation, especially where conductive tropical or glacial overburden overlies resistive granitic or metamorphic rocks. The problem is that as it is cannot be seen in the data, it is not suspected!
Thank you sir
Why a barren intrusion has a lower resistivity with respect to a similar intrusion but with disseminated metallic ore,as you pointed out?
There is a series of articles from Andre revil that discusses a lot of details about IP and resistivity and effect of various parameters. Look at these two, I guess the reason is mentioned here: dx.doi.org/10.1190/GEO2014-0577.1 dx.doi.org/10.1190/GEO2014-0578.1 As far as I remember the current tends to enter the conductive grains and then it have to come out of it and so on and so on. As there are many grains very close together, it complicates the current path and that seems to be the reason of that. Check the references to ensure my response is the exact reason of this
Thanks a lot for sharing. I have been asked to prepare a report on electrical resistivity interpretation. Could you help me in creating a structure, how should i arrange important steps in the interpretation stage, just topics, please?
Look at reports etc Depending on your case you may add remove combine sections etc Abstract Introduction Theory (brief) Study area Project design Data acquisition Processing Interpretation Conclusion References Appendix
thnkz alot sir I'm v.glad to get a channel like yours teşekkür ederim gerçekten
Thanks very much for the lesson
I need your help or to reverse electrical resistivity tomography data. THANKS
How can I help you?
Hello, good job
Pls do more on sofrware use in geophysics. thank you
Merci Sayyed :)
Hi Reza Great course. I really appreciate what you have done to prepare this mini-course. May I ask what the name of books or lecture notes you mentioned in this session was?
Hi They are mainly from: Geophysics for the mineral exploration geoscientists geotomosoft.com/coursenotes.zip
Very very useful. Thank you so much !!
thank you so mush for the video u have no idea how mush u helped me but i cant find the pfd support
In the link that I have mentioned for downloading the res2dmod, you can find the pdf manual inside one of the zip files: www.geotomosoft.com/r2dmodwin.zip
سلام استاد برنامه گوگل ارث داخل وبه یا برنامههه؟
این نرم افزارش بود به صورت وب هم هست ولی نمیدونم همین کار رو بشه انجام داد در نسخه وب یا نه
Hey, great video! Are there any programms like surfer that are online, or at least free?
There should be several softwares but the one comes to my mind is QGIS You can also plot a contour map via python (ask ChatGPT to help you) :)
@@OneGeoscientist That is so helpful thank you very much!
Thanks for your effort, you mentioned in this video that there is an article discuss the characteristics of different array { Ping; Zoë 2004) but I did not recognize the spelling, any link for this paper plz?
A numerical comparison of 2D resistivity imaging with 10 electrode arrays Torleif Dahlin, Bing Zhou onlinelibrary.wiley.com/doi/10.1111/j.1365-2478.2004.00423.x
Thank you so much sir ji
Thenks 😊
درود بر شما ، صدا خیلی ضعیف هست
Thanks for your lectures sir, I really appreciate. I'm a recent graduate, I've learnt a lot
Bitte machen Sie unbedingt weiter so! Ihre Videos sind eine wertvolle Quelle des Lernens und der Inspiration für viele von uns. Ich freue mich bereits auf zukünftige Inhalte und darauf, mehr von Ihrem fundierten Wissen zu erfahren.
Ihre Erklärungen sind äußerst verständlich und lehrreich. Es ist offensichtlich, dass Sie viel Mühe darauf verwenden, komplexes Wissen auf eine Weise zu vermitteln, die für jeden zugänglich ist. Bitte machen Sie unbedingt weiter so! Ihre Videos sind eine wertvolle Quelle des Lernens und der Inspiration für viele von uns. Ich freue mich bereits auf zukünftige Inhalte und darauf, mehr von Ihrem fundierten Wissen zu erfahren.
I am glad that is helpful.
Hello Please write a link to the surfer program
Cuse i have windous 7
Hi. Sorry for the late reply. Here is the link. www.goldensoftware.com/products/surfer
@@OneGeoscientist How can we activate it if the free trial ends, thank you very much
I enjoy it
hello my friend can i ask you When I used Google Earth Map and go back in time, many colors appeared, including yellow, blue, brown, red, black and white. What do the colors indicate? Can you help me?🫶
Hey. I don't get your question but if you mean the tune of the colors, maybe it is because of the different times of the day that the satellite picture is taken but I am not sure
@@OneGeoscientist thanks YOU brother🌹
Hi! Can you tell me what is the software to show the section with points of value ERT?
You can do it in many ways, just need to have x,y then you can plot it anywhere such as excel
really easy tutorial, thank you so much!
Can you help me with some question realated to ert
send me an email
Thank you! I wish I had seen it sooner. It was very useful. You explained it clearly in a short amount of time
What is the utm zone for Guyana south America
UTM zone 21N
Hello, please tell the prerequisite playlist you told to watch about dr rook. I cant find it
Dr Loke's notes not videos. www.geotomosoft.com/coursenotes.zip
What is the contour level of the generated map? What is the accuracy?
Accuracy depends on the DEM used in google earth in each area which could be different. This is only for a regional topo where an approximate data works
OMG thankful!
you are great🌹
Besten Dank für für die hilfreiche Informationen und Videos.
Thank you very much. Sir
Sir please explain how we can integrate our ERT/ERS results with the ground image as you present in one of the title images at the start of the video.
That is just for the sake of beauty as it was possible due to the cliff. That is done in corel draw (same as photoshop).
ممنون استاد، خیلی آموزنده و سریع. دست شما درد نکنه
عرض سلام و ادب خدمت استاد بزرگوار، ممنون از معرفی این سافت.
🤩😇
🤩
🤩
damavand🤩
How to present a Geologic map on Google Maps?
I have not tried to do it with google maps. I even use google earth app on my mobile which is really nice.
Dude next level 🤩 rocking delivery
Although I didn't become a hero, I certainly end this series of videos with much greater knowledge. Thank you very much.
No worries. I am not a "hero" myself, maybe a semi-hero, :) I tried to share some of the things I learned and read in a few videos. Hope it helps.
Thanks for sharing your knowledge. You have a great didatics.
thank you for this great topic. keep up the good work.
Thank you