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Sponsored by the U.S. Department of Energy under award DE-EE0002850 to the Arizona Geological Survey acting on behalf of the Association of American State Geologists.
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Sponsored by the U.S. Department of Energy under award DE-EE0002850 to the Arizona Geological Survey acting on behalf of the Association of American State Geologists.
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Has anyone else encountered this problem?
My name is Tiffany and I am with the Indiana Geological Survey. Going through some of the logs I discovered that some wells with temperature logs that also contain another log such as Induction, Gamma, etc. are not consistent. The Bottom Hole Temps and Max Temps do not list the same temp for very similar depths. They vary from 5-10 degrees which is a significant difference when the average depth variation is less than 100 feet. We took a closer look at the logs and found that in many situations like this the logs were logged during different circumstances such as time of year, open hole vs cased hole, type of fluid in hole, etc.
Has anyone else encountered this problem?Which log should be used since both temperatures given could be accurate? Should priority be given to a temperature well? Or should both be kept? I could really use some ideas as to what others have been doing about this. Thanks, Tiffany
One person's experience
From Rick Bowersox at the Ky Geological Survey:
The borehole is cooled during drilling by the circulation of the drilling fluid. The bottom hole temperature (BHT)recorded on the first log after circulation has stopped will be the lowest and least accurate. As the borehole temperature equalizes over time, the BHT will rise if no fluid has been subsequently circulated
Well Log Data temperatures
The well log data should be entered on the WellLogData template with one entry for each log type. If a well has several logs associated with it, then all the logs should be entered into the WellLogData template. The maximum temperature from each log is recorded along with other information from the log header record and well data. Each well log record is dereferenced back the the WellHeader record and perhaps the Bottom Hole Temperature record by the WellURI. The end user will use specific information provided to calculate or decide on the most accurate temperature which is why there are fields for time since circulation, case sizes, measurement depth, muds etc.
Diane Love AZGS
Posted in error
oops, I thought I was replying to the first comment....
Fluid temperature logs submittal
I work for the NJ Geological Survey and we are preparing to submit fluid temperature logs from water wells. I have some questions: 1. Which spreadsheet template(s) should be filled out? 2. Are these templates considered metadata templates? 3. What format should the data submittal be in? LAS files, CSV files, images/pdfs and how should they be named? 4. Can I fill out one metadata template containing entries for each log/well or should I fill out individual metadata templates for each log/well?
Response to NJGS content model questions
Hi NJGS,
1) Use the AqueousChemistryTemplate found at http://www.stategeothermaldata.org/data_delivery/content_model_templates . This template is the Content Model used to place data into the NGDS schema for interoperability. The top row 'Feature Headers' are the key to interoperability which allows data to be collected and used with minimal manipulation (end user friendly). Data from across all the states will have similar attributes and will be able to be used in maps and data programs without further cumbersome manipulation. The Aqueous Chemistry template data is related to the either the Thermal/HotSpringsFeature or the Well Header templates which provides the basic name, owner, feature ty[pe, location, driller, temp, related resources, source etc. Both the Header and Chemistry template share the same WellURI or SpringURI that connects the two datasets to provide the most complete information.
2) the Metadata template is for Documents, reports, maps - scanned files or files with online links to open/download the document.
3) The data will be entered (or mapped from your dataset) directly into the content model Excel sheets. For states that already have a service with sufficient data 'Features" they can often set up a second service by mapping the 'FeatureHeaders' from their schema into the NGDS schema. A few Content Models are geo-databases that are submitted with shape files (fault lines, polygon features) such as ActiveFaults and Geologic Units.
4) The Content Models are set up to enter all like data (well logs, well headers, document metadata, AqueousChemistry etc) into one content model where each record is one row of data. Thus you may have 5 well headers (5 rows in the WellHeader template) and 4 logs for each well header (20 rows in the WellLogData template). The Aqueous Chemistry template is set up so you can enter your data into a small suite or two of like analytes, or use the complete everything sheet with numerous columns that we hope cover most geothermal chemistry suites.
Feel free to contact us anytime. Also - check the USGIN reposiotry collections to view other states' submissions: http://repository.usgin.org/collection
Reply to dlove: Data Content Models and NJGS Data
dlove:
Thank you for your quick reply. It has cleared up a number of questions even though it seems that I had asked the wrong questions in the first place.
Upon reading your reply, it became clear to me that I had misunderstood the purpose of the data templates; they are entry forms used to populate the NGDS database with discrete data entries. The NJGS data does not fit that model as they are continuous geophysical logs of temperatures in a water column and as such will be submitted as individual files (to be made available for download) with the metadata template. Which again brings up the question of the metadata, is it sufficient to fill out one metadata spreadsheet with multiple entries (each row representing one log) or does each file have to have its own metadata template?
Thanks again for your reply.
Metadata entries
You will only need to complete one Metadata template with each log having one record (row).
Please pay attention to the Title and Description columns (usually this is where folks mess up).
The Title is the name of the Document (text name) not the file.ext name [i.e. Digital Geophysical Temperature-Depth Logs for Water Wells from New Essex County, VT]
The Description should describe the document (similar to an abstract) [i.e. The Geophysical log recording continuous temperatures by depth for water well NEC-12345 in New Essex County, VT] . It can be one line or as much as you can provide. The contact / resource provider / metadata provider / originator information can usually be copied on down the column if the documents have the same source or from the same agency. Should go fairly easy.
Diane Love
Thank you!
Thank you so much for your assistance.