Posted on October 31, 2018 by Geoteric
For a faster way of screening anomalies to confidently interpret your geology, GeoTeric incorporates RMS amplitude calculations in the iso-proportional slicing tool and also allows the creation of a volumetric RMS cube using processes and workflows. Learn more and follow our step by step guide to create an RMS volume in your GeoTeric project.
One of the most common seismic attributes used in reservoir characterisation is the RMS Amplitude. The RMS amplitude (root mean square) or quadratic mean is independent of phase and will highlight the magnitude of the amplitude response over a certain footprint.
GeoTeric incorporates RMS amplitude calculations in the iso-proportional slicing tool. Here the user can tick the RMS Energy option when setting the parameters for the slicing and the RMS amplitude will be calculated for each of the generated slices.
GeoTeric’s Iso-proportional slicing incorporates the ability of calculating RMS amplitude for each of the generated slices
In many cases, it can be useful to have an RMS volume, which provides a faster way of screening for anomalies.
If your data is not in floating point, you will need to convert your data to floating point as not to clip the integer data. To check if your data is in floating point format or not, under File -> Project Manager -> Volumes.
To convert to floating point:
Go to Workflows -> Processes and Workflows -> Processes -> Utilities -> Convert. Select your input volume, select Float on the “convert to” dropdown menu, give the output volume a name and click Run Workflow.
In order to compute the RMS volume in GeoTeric we will first calculate the square of the reflectivity, then take the mean of that volume by smoothing. Lastly, the square root of the mean volume will be calculated.
Time slice showing the RMS amplitude volume for the HCA2000 dataset (Data provided by Geoscience Australia)
Alternatively, we have a batchjob file available which can be downloaded here. This batchjob file can be loaded directly into GeoTeric by going to Workflows -> Processes and Workflows -> File -> Open… Then we have to set the input volume in the first tab (Convert#1), select the z footprint in the third tab (Smoothing#1), and press Run Workflow to generate the RMS volume.