Dual Energy CT (DECT) Model


Recent advances in core-scanning technology have provided the necessary data to output basic reservoir volume models at extremely high resolution using non-destructive techniques.  Output data from Dual Energy Computed Tomography (DECT) includes both porosity and rock matrix information. 

Given standard core spectral gamma scans (K, U and Th) and Dual Energy CT (DECT) scans, it is possible to solve for several reservoir components both in conventional and non-conventional reservoirs.  The model can be either calibrated or un-calibrated to other lab data.

The DECT Model solves for a limited number of rock matrix components to define an apparent matrix

DECT core scanning yields both bulk density and effective atomic number curves; the latter is equivalent to the wireline photoelectric effect (Pef) log by an exponential mathematical relationship.  The DECT model can be defined to solve for matrix only, or can be used to solve for an apparent porosity and requires both core gamma and DECT core scans.  

CT and now Dual Energy CT scanning combine with core gamma is offered all around the world, administered by highly trained technicians.

Weatherford has extensive experience with CT scanning and is now moving into new frontiers of providing the next generation of Dual Energy CT scans.  These new scans output high-resolution core logs that aid in the modeling of geologic formations, their mineral components and rock properties.

Key Advantages of Dual Energy CT Scanning and Modeling:

  • Helps charaterize reservoirs

  • Improve selection of core plugs

  • Obtain high resolution core logs with output model of basic reservoir components

  • Quicklook estimation of rock matrix

  • Prescreening for potentially high quality reservoir rock

As one of the first procedures performed on core arriving at the lab, CT scans and now DECT scans provide a digital record of the core prior to additional testing, and aid in subsequent analysis.