Example Flow: Writing Petrophysics Results to Grids
This Flow demonstrates how to write petrophysics results to a static grid file. This is useful to lock in petrophysics results for display in a map file. This Flow will have the following tools:
- LogInput >> Brings the log data into the Flow
- CpiLogCalc >> Calculates the curves for gridding
- PointsToGrid >> Converts the points to a grid format
- GridOutput >> Writes out the .grid file.
Here is an example showing the Flow to grid several properties:
The LogInput allows us to bring the log data into the Flow. The CpiLogCalc similar to our other Flows is where the heavy lifting is done. It calls the CPI file and writes the equations. Note that in this example it is set to output Points and not curves. Also note that we are calling the summary curves like, AVG_SW and NET_PAY_SUMMARY and not Sw or Net_Pay. This is because we need it to be averaged or added over the zone before we grid it.
PointsToGrid groups the properties by Property and Zone and then does the gridding.
GridOutput writes the result.
Note that in Danomics we have a multi-grid format. So this Flow will make the grid for every selected property for every zone - in this example where there are 30 properties and 10 zones that is 300 grids being written into one file.
Tips and Tricks
- Remember to add summary properties, not curves to the Config Equations (e.g., Avg_Sw, not Sw.) in the CpiLogCalc tool.
- Make sure to select the correct output mode in the CpiLogCalc tool.
- To ensure grids are displayed as expected it is useful to have a specified projection either in your folder or selected in the Flow.
Related Insights
Quick Start Module
Purpose The Quick Start module is designed to help users quickly set dozens of common parameters by selecting a handful of basic options from dropdown menus. Parameters There are three parameters that are set on a zone-by-zone basis and two parameters that are set on a full-well basis. These are as follows. Discussion The parameters are linked to what are called named_defaults in the software. These are collections of defaults that can be set through assigning a single parameter.
Sample data to get started
Need some sample data to get started? The files below are from data made public by the Wyoming Oil and Gas Commission. These will allow you to get started with petrophysics, mapping, and decline curve analysis. Well header data Formation tops data Deviation survey data Well log data (las files) Production data (csv) or (excel) Wyoming counties shapefile and projection Wyoming townships shapefile and projection Haven’t found the help guide that you are looking for?
NMR Interpretation Module
Purpose The NMR interpretation module allows users to calculate porosity, bound and free fluids from the measure T1 and T2 distributions from NMR tools. Primary Outputs Discussion In oil and gas well logging, the $T_2$ distribution is used as a high-resolution "map" of the formation's pore system. While a standard porosity tool tells you how much fluid is there, NMR tells you where that fluid is trapped and whether it will flow.