Permian Basin Maturity Modeling Study (delivered June 2015)

The study was carried out by Sirius Exploration Geochemistry using our proprietary Novva software, which provides a new and unique tool not only for 1-D maturity modeling, but also for geologic investigation and integration. The study includes 103 wells spread across the Permian Basin. The great majority of those wells penetrate into or through the Ordovician Ellenburger Group, and all models constructed will cover the entire stratigraphic section from Ellenburger to the surface.

Permian Basin Basic Map

Map of the study area, showing the locations of the 103 modeled wells.

The benefits and deliverables for this study include the following:

  • Carefully constructed geohistory curves for all models, with superimposed tectonic events and tectonic-subsidence curves.
  • Maps of a variety of input and output data. An example of mapped input data is basal heat flow. In addition, Ro and Transformation Ratio are mapped for each modeled source-rock interval, which range in age from Devonian through Permian.
  • Time plots showing cumulative oil and gas generated and expelled through time for each suggested source interval in each modeled well.
  • Plots showing the anticipated in-situ hydrocarbon mixtures (e.g., GOR) for each suggested source-rock interval and all proposed reservoirs in each modeled well.
  • Maps of anticipated hydrocarbon composition within each unconventional reservoir across the study area. Those maps are influenced both by the mixture that is generated directly from kerogen, and any cracking of oil to gas that may have occurred.
  • Full documentation of all details of the model-building and optimization processes, including comprehensive discussion of our reconstruction of the tectonic, erosional, and thermal history of the study area. All assumptions will be clearly identified and justified.
  • Comprehensive written report in electronic form, with appendices showing output data for all models.
  • All input data for models in Excel format and as Novva files.

ghc D-15

Geohistory plot for a modeled well in the Delaware Basin, showing proposed tectonic events and tectonic subsidence (red line).

Permian Basin Basal Heat flow

Colored contour work map of basal heat flow across the greater Permian Basin.

chc-ogr b-Wfd V-9

Cumulative hydrocarbons generated and expelled at the base of the Woodford at a modeled location in the Val Verde Basin, showing timing of generation and expulsion for each product. Also shown in blue is the rate of oil generation through time.

Because of the care we take in building and calibrating our models, and because of our ability to choose the most-appropriate kinetics for each source rock, our calculated levels of hydrocarbon generation and cracking have a high level of confidence. Consequently, our maps of generation are the most-accurate available, and are directly applicable and essential for making a variety of exploration decisions, such as entry or exit from specific plays, risking and prioritizing of resources, and expansion or contraction of acreage positions. We do not use calculated or measured Ro or Ro equivalents as a proxy for generation and cracking, but rather employ those data to calibrate our proposed burial and thermal histories. We calculate generation and cracking directly using kinetic equations and source-rock kinetics derived for this study.

Z-Ro D-14

Present-day calculated Ro profile at a modeled location in the Midland Basin, with stratal boundaries shown in gray for reference. Green points are Ro equivalents obtained from measured mean activation energy values (Mean Ea) generated for this study.

Less-obvious but also important for making exploration decisions is the improved understanding of the integrated geologic history that can be obtained from careful and thoughtful 1-D modeling studies.  This study includes a comprehensive review of the tectonic histories of the different parts of the study area, including detailed analysis of the significance of the tectonic-subsidence curves. It will aid in understanding the causes and consequences of events during unconformities, and the links among water depth, elevation, tectonic events, lithologies, eustasy, and isostasy through time. This information can then be linked to deposition of source-rock and reservoir facies, and to thermal history.

Please contact us for further information about this study, including current pricing.