Getting Started with Petrophysics
This guide walks you through how to perform a petrophysical interpretation in Danomics. This tutorial can be completed in its entirety in less than two hours and covers everything from loading data through finalizing and exporting your results.
If at any point in the process you need help, please contact us at firstname.lastname@example.org.
For this tutorial you will need well log, well header, and formation tops data. You can download them using these links:
- Well log data
- Well header data
- Formation tops data
- Production data (CSV format / Excel format)
- Wyoming Counties Shapefile and Projection
- Wyoming Townships Shapefile and Projection
The well log, header, and production data were collected from the the State of Wyoming’s oil and gas commission website. The formation tops are a Danomics work product. The shape files were downloaded from the USGS. Please note that we do not guarantee the completeness or accuracy of any of this data and recommend against using it outside of this demo.
Step 1: Loading Data
To get started you will first need to upload some data to Danomics. In the video below we show how to upload well log, well header, well tops, production, and shapefile data.
Step 2: Creating a New Project
After loading your data you are ready to start a new petrophysical interpretation. In the video below we demonstrate how to create a new petrophysical interpretation, change the window layouts, modify the log displays, and set a key well. Remember to save your work with File >> Save or using Ctrl + S.
Danomics uses the concept of a “key well”. Parameters set in a key well will be used to build up an “interpretation blueprint” that will be automatically applied to non-key wells. Using a key well isn’t required, but is recommended as it will save you significant button clicking in projects with multiple wells.
Step 3: Setting Petrophysical Zones
Danomics lets you interpret either from top to top or by using defined zones. Using defined zones helps you make apples-to-apples interpretations across an area, handle pinch outs and unconformities, and deal with missing tops more effectively. In the video below we demonstrate setting up zones.
Step 4: Interpretation Ready Data
Danomics has significant data conditioning and clean-up workflows. When you pull your data into a project Danomics aliases your data, performs unit conversions and lithologic corrections, and ensures your data is ready to work with. Danomics has one-click curve normalization and automated, machine-learning powered washout repair tools. In the video below we demonstrate these capabilities.
After completing the tutorial through the videos above your data should now be Interpretation Ready. In the following videos you will build up and interpretation using Danomics core petrophysical workflow.
Step 5: Clay Volume Interpretation
The first step in Danomics petrophysical workflow is to estimate the clay volume. In this video we demonstrate how to use the Clay volume module, as well as how to set parameters in cross-plots and by dragging and dropping parameter lines on the well log track.
Step 6: TOC Analysis
In the video below we continue our interpretation with an estimation of the total organic carbon (TOC), demonstrating how to perform the interpretation with several different methods.
Step 7: Mineral Inversion
Mineral inversion is an advanced technique that allows you to estimate the mineral volumes in your wells. This type of mineral modeling can help you develop a more accurate interpretation of porosity, especially in complex or mixed lithology systems. In the vide below we demonstrate how to set up the inversion and QC the results.
Note that to use the mineral inversion results in your porosity calculation, you will need to specify that in the Porosity Interpretation module. The following section demonstrates this.
Step 8: Porosity Interpretation
Danomics offers several methods for determining the porosity. In this video we demonstrate how to use this functionality.
Step 9: Water Saturation Interpretation
In the video below we continue our interpretation by progressing to the water saturation interpretation module.
Step 10: Cutoffs Interpretation
Now that we have made interpretations for key properties such as clay volume, porosity, and water saturation we will flag reservoir intervals as gross reservoir, net reservoir, and net pay as shown in the video below.
The table below shows the cutoffs set in the video.
|@phie >= 0.06 && @gross_res
|@sw <= 0.65 && @net_res
|@phit >= 0.05 && @gross_res
|(@sw <= 0.65 || @resd_final > 10) && @net_res
Step 11: Volumetrics
In this video we continue building upon our interpretation and will perform and estimation of the oil and gas in place.
At this point we have now completed our interpretation. In the subsequent videos we will demonstrate how to export your results, generate maps and cross-sections. In Step 14, we demonstrate how to use grid-based parameter interpolation.
Step 12: Exporting Results
In the video below we demonstrate how to export the results of your interpretation. This includes exporting the log interpretations as LAS files and a well-by-well and zone-by-zone summary.
Step 13: Maps and Cross-sections
In this video we demonstrate how to generate a property map to help you visualize and QC, change the basic styling of the map, and make cross-sections.
Step 14: Grid-based Parameter Interpolation (Advanced)
In this optional step we demonstrate how to use Danomics spatial interpolation that lets you populate properties using gridded data. We demonstrate this using maturity data, but this can be performed for nearly any property.
The example data used for making the maturity grid is available here: Example maturity data.
Congratulations on completing the Welcome tutorial. The concepts learned in this tutorial will provide a solid base for performing petrophysical interpretations using Danomics. Remember that you can always access our full range of help articles here: Danomics Help Articles and if you need support you can contact us at email@example.com.