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Featured links  
 
TERRASCIENCES, Inc.
Innovative PC & UNIX based geological and well log analysis software, including a state-of-the-art borehole image processing & interpretation package.
FracMan® Technology Group
The FracMan® Technology Group of Golder Associates provides a complete range of consulting services, custom software development and technical support.
Subsurface Consultants and Associates, LLC
A full service upstream petroleum consulting and training company.  SCA is a world leader in petroleum exploration, development and training services.
Allied Geophysical Laboratories
This industrial/academic consortium at the University of Houston is a world leader in applied geophysics.  What else would you expect from an institution located in the Hollywood of the oil industry?
 
Selected links by category 

INDUSTRIAL
      Fluid inclusions  
      Structure and fracture software  
      Well logging services, software & equipment  
      Engineering services & software  
GOVERNMENT SERVICES
      U.S. state & federal  
      International & non-U.S. national  
SOCIETIES
      Houston & Gulf Coast  
      International and U.S. national  
RESEARCH
      Industrial, academic and/or government consortia  
      Earth science researchers  
      Materials science researchers  
INFO: Useful information, reference material & link lists  
      Calculators & converters  
      Chemistry  
      Geoscience link lists  
      Geomagnetism  
      Mapping  
      Plate tectonics  
      Structural geology  
      The business of oil  
        The end of cheap oil and industrial civilization  Exciting new subsection!
      Geologic time  
      The current time  
      Tides & astronomical  
      Weather  
      Well logging  
My wife 


Last update:   18 March 2005

Trading links.  Would you like a link to your website posted here?  If yes, then please link to this website and let us know that you did.  We'll reciprocate if we think you have a quality site.  

Help me out!  Please send suggestions for links and report dead links to: Webmaster@NaturalFractures.com

Micro-editorial: Every website should have links.  The World Wide Web would not be a web at all without links, which is one reason this site has a substantial page of quality links in addition to the links embedded in the Technical pages.  Unfortunately, many websites do not have links pages.  Failing to post links does a disservice to the site's readers and the entire online community by limiting both the site's scope and the connectivity of the web.  A good links page will increase a site's traffic.  Conclusion: Every website should have a links page.

A point of linking policy.  Note that some of these links connect to competitors' websites.  Such links are taken down eventually if the competitor doesn't believe in their own products and services enough to reciprocate by linking to this site.  I apologize to this site's visitors for the inconvenience and limited scope that this policy causes, but to do otherwise is unfair to ourselves.



INDUSTRIAL  

 
 

Fluid inclusions  

 
Fluid Inclusion Technologies, Inc.
FIT offers a variety of laboratory fluid-inclusion analytical services including some previously proprietary technologies developed at Amoco Production Research Labs. Services include fluid inclusion "logging" by rapid bulk analysis of well cuttings and near real-time quadrapole mass-spectrometer analysis of mud gas.
 
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Structure and fracture software  

 
FracMan® Technology Group
The FracMan® Technology Group of Golder Associates provides leading-edge quantitative fracture characterization and Discrete Fracture Network (DFN) modeling and flow-simulation software including the famous FracMan Software Suite and the new geoFractal.
 
Midland Valley Exploration Ltd.
2D Move, 3D Move, and other modules provide a complete suite of 2D and 3D structural restoration and modeling software including a fracture generator module.
 
Geo-Logic Systems, LLC
LithoTect provides state-of-the-art structural geology tools in an open, distributed, collaborative, n-D earth modeling environment. Development of LithoTect is funded by a consortium of major oil companies.
 
Paradigm Geophysical Ltd.
Paradigm sells GeoSec®, which is the first software suite that was developed by the founders of the Geo-Logic Systems, LLC (previous link).
 
Rock Deformation Research
Juxtaposition analyzes and models the develop of fault-rock and fault-seal types. RDR operates as a business unit of the University of Leeds, England.
 
Stereonet, FaultKin, Fault/Fold & others
Rick Allmendinger and his students at Cornell have written an excellent set of Mac and Windows programs that are essential tools for structural geologists.
 
Stereo Nett
A nifty little shareware program for stereonet plotting, orientation statistics, and simple paleostress analysis.
 
Rod Holcombe's software page
Structural geology, mapping, and GIS software.
 
Beicip-Franlab
Locace: Structural interpretation. Fraca: Fracture network modeling. This company markets commercial releases of IFP-developed software.
 
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Well logging services, software & equipment  

 
Advanced Logic Technology
Software and hardware for borehole geophysics and geology. The company offers a slimhole acoustic televiewer.
 
Baker Atlas
This "Big Three" integrated oil & gas services company offers wireline open & cased-hole acoustic televiewers and a wireline microresistivity imager.
 
COLOG
Slimhole geophysical, hydrophysical and water quality logging and log interpretation, including optical televiewer logging.
 
Computalog
International oilfield services company specializing in wireline logging and directional and horizontal drilling technologies. Computalog offers Halliburton's EMI electrical imaging tool.
 
Dowhole Surveys Pty. Ltd.
Specializing in borehole directional surveying, geophysical logging (including an acoustic televiewer) and interpretation for the mining, mineral exploration and civil engineering industries throughout Australia, New Zealand and S.E. Asia.
 
Halliburton Energy Services
This "Big Three" integrated oil & gas services company offers wireline: Open & cased-hole acoustic televiewers, a microresistivity imager, and a conventional video imager (not an optical televiewer). Unfortunately, this website is useless.
 
Mount Sopris Instruments
Manufacturers of borehole geophysical logging systems for the geological, natural resource, and environmental communities. No imaging tools.
 
OYO Corporation, Ltd. - English
OYO Corporation, Ltd. - Japanese
Geophysical logging tool and testing equipment manufacturer offers both slimhole acoustic and optical televiewers with bundled software.
 
PathFinder Energy Services, Inc.
The only independent MWD & LWD supplier.
 
RaaX
Inventors of the optical televiewer technology.
 
Robertson Geologging, Ltd.
Slimhole borehole logging equipment, well logging instrumentation and contract logging services for civil engineering, geotechnical, water well management, environmental and mining surveys on every continent. Equipment includes acoustic and optical televiewers and video inspection systems.
 
Schlumberger
This "Big Three" integrated oil & gas services company offers wireline open & cased-hole acoustic televiewers, several types of wireline microresistivity imagers (including slimhole), and LWD density and microresistivity imagers.
 
Sondex
Manufacturer of logging equipment including multifinger caliper imaging and video logging tools.
 
TERRASCIENCES, Inc.
Innovative PC & UNIX based geological and well log analysis software, including a state-of-the-art borehole image processing and interpretation package.
 
geoPLUS Corporation
Log analysis and other PC-based software packages.
 
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Engineering services & software  

 
Gemini Solutions, Inc.
Comprehensive engineering services covering evaluation, development and management of oil and gas reservoirs.  Powerful, user-friendly, PC-based, reservoir-simulation software.

 CONTENTS 


GOVERNMENT SERVICES 
 
  U.S. state & federal
 
Texas Bureau of Economic Geology

U.S. Bureau of Indian Affairs - Division of Energy and Mineral Resources

U.S. Bureau of Land Management

U.S. Department of Energy

U.S. Department of Energy - Office of Fossil Energy

U.S. National Geodetic Survey

U.S. Geological Survey

U.S. Minerals Management Service

Gas Technology Institute  Formerly GRI and IGT.

 
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International & non-U.S. national

 
United Nations - UNESCO Division of Geosciences

Argentina - Instituto Geographico Militar

Australia - Geoscience Australia

Canada - Natural Resources Canada

Great Britain - British Geological Survey

India - Geological Survey of India

Japan - Geological Survey of Japan

Mexico - Instituto Nacional de Estadística, Geografía e Informática (INEGI)

Norway - Norwegian Geological Survey

New Zealand - Institute of Geological and Nuclear Sciences

New Zealand - Land Information (the national mapping office)

South Africa - Council for Geoscience, Geological Survey of South Africa

Sweden - Geological Survey of Sweden

The Netherlands - Institute of Applied Geoscience TNO - National Geological Survey


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SOCIETIES  

 
 

Houston & Gulf Coast societies 

 
Houston Geological Society

Geophysical Society of Houston  The local chapter of SEG.

Society of Petroleum Engineers - Gulf Coast Section

Society of Professional Well Log Analysts - Houston Area

GCSSEPM   The Gulf Coast Section of the Society for Sedimentary Geology. Please don't ask me where they get the initials from.
 
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International & U.S. national societies 

 
American Association of Petroleum Geologists

American Geological Institute

American Geophysical Union

Association for Women Geoscientists

Association of Polish Geomorphologists

Environmental and Engineering Geophysical Society

Geological Society of America

International Commission on Stratigraphy

International Society of Downhole Imagers

International Union of Geological Sciences

Minerals and Geotechnical Logging Society  This is an at-large chapter of SPWLA.

National Association for Black Geologists and Geophysicists

National Cartographic Information Society

SEPM (Society for Sedimentary Geology)  Again, please don't ask me about the initials.

Society of Exploration Geophysicists

Society of Petroleum Engineers

Society of Professional Well Log Analysts

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RESEARCH 

 
 

Industrial, academic and/or government consortia

 
Fracture Research and Application Consortium
Univ. of Texas at Austin & Texas Bureau of Economic Geology
This large consortium (8 faculty, 11 staff) focuses on finding new methods to understand and successfully predict, characterize, and simulate fractures and other reservoir-scale structures.
 
The Seal Evaluation Consortium
Professor Terry Engelder, The Pennsylvania State University (Penn State)
The Penn State Seal Evaluation Consortium (SEC) supports research on brittle fracture under overpressured conditions in sedimentary basins. Fluid-driven or fluid-assisted brittle fracture plays a critical role in seal integrity, hydrocarbon migration, and fractured reservoir development at depth.
 
The Stanford Rock Fracture Project
Professor David Pollard & Professor Atilla Aydin, Stanford University
The Stanford Rock Fracture Project is one of the largest groups in the world devoted to research on problems of rock fracture, crustal deformation, and fluid flow with special attention to petroleum industry needs.
 
Rock Deformation Research
Professor Rob Knipe, University of Leeds
Rock Deformation Research (RDR) is a group of geoscientists doing commercial consulting, service work and sponsored research in structural geology and fluid flow for the petroleum and minerals industries. RDR is a business unit of the University of Leeds.
 
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Earth science researchers

 
Professor Terry Engelder, The Pennsylvania State University (Penn State)
One of the world's leading workers in natural rock fractures and earth stress.
 
Professor Mike Gross, Florida International University
Prof. Gross quantitatively analyzes field and subsurface data to understand deformation processes in layered rocks and characterize fractured rock masses. Specific issues addressed are: Joint spacing, high-permeability fracture zones, fold development, fault growth, and understanding tectonic history from regional fractures.
 
Professor John Shaw, Harvard University
Prof. Shaw's research emphasizes the development of new technologies for petroleum exploration and production and studies of active faults for the assessment of earthquake hazards.
 
Professor Richard Allmendinger, Cornell University
Research in structural geology and tectonics, especially regional tectonics of the Andes, active tectonics, trishear fault-propagation folding, kinematic and statistical analysis of fault populations, and structural interpretation.  Rick and his students have written an excellent set of stereonet, fault kinematic analysis, and various other essential structural geology programs.
 
Professor Arvid Johnson, Purdue University
Home page  -  Engineering geology  -  Viscoelastic folding demo software
Prof. Johnson's research emphasizes rigorous studies of physical processes in geology, especially mathematical analysis of properly formulated theories of mechanical behavior. Although academically focused, his work on viscoelastic folding is of particular interest to geologists in the oil & gas industry.
 
 CONTENTS 


 

Materials science researchers

 
Professor John J. (Jack) Mecholsky, Jr., University of Florida
One of the world's leading workers in ceramic fractography and fracture mechanics.


 CONTENTS 


INFO: Useful information, reference material & link lists 
 
 

Calculators & converters  

 
OnlineConversion.com
Convert just about anything to anything else.  Over 5,000 units and 50,000 conversions.
 
ConvertIt.com
Converters & calculators for: Measurements, currency, time, math, finance, geography, Roman numerals... it goes on and on. Tons of reference info too.
 
Earth impact effects program
I'm not sure if this belongs in this section, but I don't know where else to put it and it is a calculator!  This program allows you to calculate the effects of an asteroid impact.  A useful tool for people studying craters and the ultimate toy for disaster paranoiacs.
 
Dictionary of measures, units and conversions
Conversion tables & constants, definitions of units, explanations of SI prefixes, links.
 
NIST - Physical reference data
Reference site on Constants, Units, and Uncertainty by the U.S. National Institute of Standards and Technology.
 
XE.com - The Universal Currency Converter
Currency converter and live foreign exchange rates.
 
OANDA.com - FXConverter
Multi-lingual currency converter with 164 currencies. The Traveler's currency cheat-sheet page allows you to print-out a table for your next trip.
 
Yahoo! Finance - Currency conversion
 
Yahoo! directory of online converters
 
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  Chemistry
 
Periodic table of the elements - WebElements
Detailed data and properties for all of the elements: Ionic radii, bond enthalpies, electronic and physical properties...  Brought to us by the Chemistry Department of the University of Sheffield.  Note that they have other utilities and calculators.   The Orbitron is interesting.
 
Periodic table of the elements - Los Alamos Lab
Intended for elementary through high-school students.
 
Thermodynamic data and property sites on the web
Links to property databases, calculators, programs, organizations & bibliographies. There is a vast amount of information here.
 
 CONTENTS 


  Geoscience link lists
 
British Geological Survey - Geoportal
Geoscience links, addresses, phone and fax numbers.
 
University of California, Berkeley - Earth Science & Map Library
 
Illinois State Academy of Science
 
University of Calgary Earth Sciences Library
 
Structural geology on the web
 
Structural geology and metamorphic petrology on the web
 
Yahoo! Geosciences
 
Geology Resources
Geology related news, books and link lists.
 
KwMap.net - Browse the Keyword Map of NaturalFractures.com
This site is an alternative to conventional search-engines.  As of this posting (Feb. '04) it's still short on data and can wander off-subject pretty badly, but it's a good idea and with a little rooting you can turn-up things that you might not find otherwise.  If it's ever perfected, takes-off, and becomes the next Google then remember that you saw it here first.
 
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  Geomagnetism
 
National Geophysical Data Center - Online magnetic field computations
Compute the correct declination and inclination for correcting wellbore survey data, or for setting the declination on your compass.
 
U.S.G.S. - Geomagnetism
Lots of information and a short link list.
 
British Geological Survey - Geomagnetism
Contains an excellent set of downloadable charts and both British and International magnetic field calculators. Contains important discussions of the effects of space weather on directional drilling. Note that this information is equally applicable to the accuracy of image log orientations.
 
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  Mapping
 
ReliefShading
A beautiful and well-designed site about shaded-relief maps.
 
TerraServer.com
TerraServer.com offers online remote-sensing data for the entire world and allows free viewing at 8-meter and coarser resolutions.  The subsite MapTech.com provides similar free viewing and sales of topographic maps and of nautical and aeronautical charts and software.
 
 CONTENTS 


  Plate tectonics
 
Plate tectonics by U.C. Berkeley, Museum of Paleontology
Elementary theory & history for non-geologists and plate tectonic animations.
 
The Global Earth History pages by Dr. Ron Blakey, University of Northern Arizona
Fabulous stuff. The paleomaps are detailed and beautiful. Lots of other good stuff.
 
Paleomap project by Dr. Chris Scotese, University of Texas, Arlington
Way cool stuff. Fun for the whole family, including the geologist. Check out the 3D virtual reality paleoglobes.
 
ODSN Plate Tectonic Reconstruction Service
Make your own plate tectonic reconstructions.
 
 CONTENTS 


  Structural Geology
The majority of links on this page concern structural and/or petroleum geology, so perhaps you are wondering What is this section for?  This new structural geology subsection focuses on education, reference, general-interest, and unclassifiable sites.
 
Prakash Roday's Structural Geology Portal
Yes, this site is worth digging through.  Never mind the annoying music, utterly over-the-top design, poor layout, distracting animations, ads, malfunctioning computational gizmos...  If you can hang-in there you'll find loads of free educational material, links, software downloads, and other good stuff.  Much of the material is general interest, although the overall orientation is pretty academic.
 
 CONTENTS 


 

The Business of Oil  

 
Cambridge Energy Research Associates
The leading independent firm that sells predictions of the energy future. The firm specializes in energy markets, technology, geopolitics, and strategy.
 
Energy Information Administration: Petroleum
This U.S. Department of Energy website includes data on oil and gas prices; an overview of imports and exports, supplies; and information on domestic exploration and production.
 
International Energy Agency
Autonomous agency linked with the Organization for Economic Co-operation and Development (OECD).
 
Oil price history and analysis
History and analysis of crude oil prices.
 
Oilnergy
My favorite place to check oil prices, futures, etc.
 
OPEC
The mother of all cartels.
 
The coming energy crisis?
An analysis of short-term U.S. energy-supply vulnerability.
 
Energy links from Rentech
This is the Links page of the Rentech corporate website. I include it here because it is an outstanding and different collection of energy-related links.
 

Oil & gas news.  The world news is my soap opera, and the unfolding of the ultimate energy crisis is the most exciting and interesting story yet.
 
Energy Bulletin
 
Schlumberger - Today's news
Schlumberger - This weeks news
 
Trade Arabia - Energy/oil & gas news
The energy section of an on-line Saudi-based business news magazine.
 
Oil & gas journal
 
World Oil
 
Oil.com
 
Bloomberg News Service
 
Yahoo! Oil & gas news
   

The end of cheap oil and industrial civilization.   Industrial civilization as we know it is coming to an end.   I am not joking.  The world is in the process of driving off an energy cliff and it is not going to be pretty.  However, I personally think that when we finally recover from the crash we will find that life is better, albeit leaner and slower.  This is not Y2K, a giant meteor, the end of the Mayan Calendar etc. and I am not a kook with an axe to grind.  This is real science and economics and it is not new - the famous geologist M. King Hubbert started the science of resource depletion, he has repeatedly been proven right, and subsequent work ever since has confirmed his results.  North American natural gas production peaked in 2001.  As of this writing (March '05) most responsible forecasters think that global oil production will peak sometime between Q4 2005 and 2008.  Yes, this is great career news for those of us who work in the upstream oil & gas industry.  However, the economic, social, and political consequences of peak oil production will affect everyone regardless of profession.  For the sake of yourself, your family, and your responsibilities as a citizen and voter you need to be informed. 
 
Peak oil primer and links
The Peak Oil Primer of the news site Energy Bulletin.  This site provides an excellent just-the-facts introduction to Peak Oil. 
 
Life After the Oil Crash
This newly-revised site by Matt Savinar provides an excellent introduction to the coming debacle in an easy-to-read question-and-answer format.  The discussion is non-quantitative and is intended for a general audience.  However, it is an excellent and very readable introduction to the subject for folks with a technical background as well.  Give the site a thorough read and follow the links.  I am slightly less pessimistic than Mr. Savinar about the economic and social consequences of the coming oil crash, but perhaps this is just an indication of my natural optimism since I can't find hard arguments against his conclusions.
 
The Association for the Study of Peak Oil and Gas
ASPO was founded by Colin Campbell, who is an experienced petroleum industry geologist, a former executive vice-president of Fina, and is one of the leading researchers in the field of hydrocarbon-resource depletion.  This website is excellent and the monthly APSO newsletters are essential reading material. 
 
Crisis Energética - Respuestas a los retos energéticos del SXXI
Spanish-language energy-crisis and oil-depletion website.  This site provides Spanish translations of the ASPO newsletters and other important material.
 
Oil Depletion Analysis Centre
The Oil Depletion Analysis Centre (ODAC) is an independent, UK-registered educational charity working to raise international public awareness and promote better understanding of the world's hydrocarbon-resource depletion problem.
 
BP-Amoco statistical analysis of world energy
Every year BPAmoco puts out a statistical analysis of world energy.  This is good collection of relevant data and is readily accessible.  You can read the report online or download it as a PDF file, the raw data can be downloaded as Excel spreadsheets, or you can use the interactive, web-based "Energy charting tool" to make your own downloadable graphs of any and all of the data and even do statistics on it.  If reading these other sites doesn't disturb you, then go to the BP-Amoco website and spend some time looking at data. 
 
DIE OFF - A population crash resource page
This website is an archive of articles, many of them scholarly, on the progress and consequences of humanity's overshoot of our resource base.  The subject matter is comprehensive - it is not confined to hydrocarbon resources.  The synopsis is excellent.  I find the Economic Theory section interesting because it details the fallacies of economics with regard to resource issues.  Sorry folks, but there is no magical Market God to save us.
 

Books.  Al's essential reading list. 
 
The Party's Over: Oil, War and the Fate of Industrial Societies
This 2003 book by Richard Heinberg provides a clear, well-written, excellent introduction to peak oil.
 
Hubbert's Peak: The Impending World Oil Shortage
An interesting 2002 book by Princeton professor Kenneth Deffeyes, who was a colleague of Hubbert at Shell.  Deffeyes' website has a Current Events page where Deffeyes occasionally posts concise comments on how events are unfolding.
 
The Oil Factor: How Oil Controls the Economy and Your Financial Future
Investment advice for the oil-crash aware from a Wall Street guru.
 
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  Geologic time
 
The official ICS geological time scale
The latest and greatest geologic time scale from the International Commission on Stratigraphy. This is a really great site that includes free PDF downloads of the detailed geologic time scale, lots of free information, and even the official U.S.G.S. and Commision de la Carte Geologique du Monde color codes for the geological time intervals. Go up one level to the ICS site for even more good info.
 
The DNAG geologic time scale
A PDF of the time scale chart produced by the Geological Society of America as part of its Decade of North American Geology project. This black & white download is an alternative to the ICS time scale charts and includes a magenetic stratigraphy column.
 
The Geological Time Scale
The basic geologic time scale courtesy of U.C. Berkeley.
 
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  The current time
 
World Time Server
Accurate current local times adjusted for Daylight Savings Time.  I recommend downloading the free utility that keeps your computer's clock synchronized with the atomic clock at the U.S. National Institute of Standards and Technology (NIST), which is accurate to +/- 1 second in 20 million years.  Never again will you wonder if your watch is correct.
 
The official U.S. time
 
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  Tides & astronomical
 
U.S. Naval Observatory Astronomical Applications Department
Complete sun, moon and other astronomical data including the dates of the solstices, equinoxes & eclipses; celestial navigation data; an interactive sun and moon data calculator for anywhere in the world; and the dates of Easter and Ramadan.  Fabulous educational material too.
 
Fourmilab - Earthview
Interactively make views of the earth and moon from space, plus more interesting links than you can stand. Go to the home page for even more cool stuff.
 
WWW Tide and Current Predictor
Ocean tide and current predictions for key locations around the world.  This is my favorite tide site despite the clunky appearance.  I never go fishing without consulting it.
 
Tides Online
Ocean tide predictions, historical data, and real-time storm-surge monitoring from the U.S. National Oceanic and Atmospheric Administration.
 
Red tide updates for the Texas coast
These nasty single-celled organisms can really ruin a fishing trip or a weekend at the beach.  Generally only of concern from mid-July to mid-October.
 
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  Weather
 
National Weather Service Houston/Galveston
Local & marine forecasts, condtions, satellite images etc. for the Houston/Galveston area.
 
National Weather Service clickable U.S. forecast map
Local and marine forecasts, conditions, satellite images, radar, etc. for the entire U.S..
 
Intellicast - Houston metro radar loop
  Intellicast - Houston regional radar loop
  Intellicast - Texas radar loop
  Intellicast - U.S. radar loop
  Intellicast - Boat & beach weather  Amazingly accurate wind forecasts.
  Intellicast - Clickable world forecast map
 
Operational wave predictions
State-of-the-art wave forecasts for the Gulf of Mexico and the Gulf of Maine from the Department of Maritime Systems Engineering at Texas A&M at Galveston.
 
Satellite Meteorology
Fabulous images and animations from the U.S. Naval Research Laboratory's Satellite Meteorology Team.
 
Operational Significant Event Imagery
High-resolution remotely-sensed images of significant environmental events such as hurricanes, forest fires, volcanoes etc. courtesy of the U.S. National Oceanic and Atmospheric Administration.
 
Tropical weather sites. Tropical weather is a topic of great interest to those of us who live in drained subtropical swamps on low, flat hurricane-prone coastlines.
 
U.S. National Hurricane Center - Tropical Prediction Center
 
Weather Underground - Tropical Weather
Provides the National Hurricane Center forecasts & graphics in a convenient format.
 
Naval Research Laboratory - Tropical Cyclone Page
The hurricanes, typhoons and tropical cyclones website of the U.S. Naval Research Laboratory's Marine Meteorology Division.
 
Storm-surge monitoring (U.S. only)
Real-time storm-surge monitoring by the U.S. National Oceanic and Atmospheric Administration.
 
 CONTENTS 


  Well logging
 
SPWLA - Logging mnemonics
Database of log curve and other mnemonics courtesy of the Society of Professional Well Log Analysts.


 CONTENTS 


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