Gas Saturation Determination - Solutions
Challenge

Integrate different geophysical data types into the reservoir characterization workflow to provide accurate volumetric estimates of rock and fluid properties, on which sound exploration and development decisions can be based.

RSI Solutions

  • Developing rock physics models at well control points and advanced modelling to examine the sensitivity of seismic and EM data to the rock and fluid  properties of interest  (iMOSS)

  • WISE: Integrated workflows in which seismic, CSEM and well log data are combined to provide quantitative estimates of sub-surface rock and fluid properties.  The workflow is illustrated in figure 1.  Seismic data are inverted to provide acoustic impedance volumes, which can used to yield good estimates of porosity and high resolution structure using well log calibrated rock physics models.    CSEM data can be inverted, using the seismic structural constraints, to give sub-surface resistivity, which when combined with well-log calibrated rock physics models, and the seismically derived porosity, can constrain the gas volume in the sub-surface

 

gas sat

Figure 1. The RSI WISE interpretation workflow to estimate gas volume. CSEM and seismic data are inverted for resistivity and impedance, respectively. These physical properties are then combined using well log calibration to provide an accurate estimate of gas volume.