Contact Sales
Sign Up Log In

Volumetrics Module

PetrophysicsJuly 30, 2025

Volumetrics Calculations

This video will review the Volumetrics module, which allows you to calculate oil and gas in place. An update for using the Vasquez-Beggs and Hall-Yarborough calculations is provided below.

Update: Using the Vasquez-Beggs and Hall-Yarborough Options

The default options for volumetrics calculations allow you to:

  1. Select the primary fluid type (oil or gas) by formation
  2. Set the area by formation
  3. Set the FVF for oil or gas (Bo or Bg) by formation
  4. Set the gas oil ratio or liquids yield. by formation
  5. Set whether to perform the calculation using the gross reservoir, net reservoir, or net pay criteria
  6. Set whether to perform the calculation using the effective (PhiE) or total porosity (PhiT)

An update has been added to provide you the additional option to “Calculate Oil and Gas FVF”, with options “Fixed Value” or “Vasquez and Beggs”. Selecting the latter will update the display so that you will now have options to:

  1. Select the primary fluid type (oil or gas) by formation
  2. Set the area by formation
  3. Set the oil and gas gravity (gas gravity only if gas is the primary fluid type)
  4. Set the liquids yield if gas is the primary fluid
  5. Set the reservoir pressure model
  6. Set whether to perform the calculation using the gross reservoir, net reservoir, or net pay criteria
  7. Set whether to perform the calculation using the effective (PhiE) or total porosity (PhiT)

When the Vasquez-Beggs option is selected the Bo (Oil FVF) and GOR is determined via the methods outlined by Vasquez and Beggs (“Correlations for Fluid Physical Property Prediction”, M.E. Vasquez and H.D. Beggs, JPT 968 – 70, June 1980.) using the pressure and temperature conditions at every depth step. To determine the Bg (Gas FVF) correlations from Hall and Yarborough (1974) are used in conjunction with the coefficients outlined by Whitson and Brule (SPE Monograph vol. 20, Phase Behavior, 2000).

Tags

Related Insights

DCA

DCA: Type well curves

In this video I demonstrate how to generate a well set filtered by a number of criteria and generate a multi-well type curve. Before starting this video you should already know how to load your data and create a DCA project. If not, please review those videos. Type well curves are generated by creating a decline that represents data from multiple wells.

July 29, 2025
DCA

DCA: Loading Production data

In this video I demonstrate how to load production and well header data for use in a decline curve analysis project. The first step is to gather your data. You’ll need: Production data – this can be in CSV, Excel, or IHS 298 formats. For spreadsheet formats you’ll need columns for API, Date, Oil, Gas, Water (optional), and days of production for that period (optional). Well header data – this can be in CSV, Excel, or IHS 297 formats.

July 29, 2025
General

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?

July 9, 2025by Cameron Snow

Get a Personal Demo

Unlock the subsurface with Danomics