Physical and chemical properties of rocks and rock fluids (non-linear geostatistics using copulas)

January 2015August 2016
Current techniques, which rely on linear relationships between variables, are limited in their ability to represent the variation that occurs in sub-surface conditions and this affects the accuracy of the resulting estimates

Physical and chemical properties of rocks and rock fluids (non-linear geostatistics using copulas)

This project assessed how copulas (a non-linear, multivariate statistical technique) can be applied to improve spatial estimation of petrophysical parameters for petroleum reservoirs and aquifers and identified opportunities to tailor these techniques for unconventional resource development.

Petrophysicists use information about the physical and chemical properties of rocks and rock fluids to develop an understanding of where hydrocarbons and aquifers occur in the subsurface and the way fluids (oil, gas and water) flow through the subsurface system. Reservoir modelling, one of the main techniques used in the identification and evaluation of hydrocarbon reservoirs such as coal seam gas reserves, relies on using geostatistical techniques to estimate the distribution of these properties over large areas. Current techniques, which rely on linear relationships between variables, are limited in their ability to represent the variation that occurs in sub-surface conditions and this affects the accuracy of the resulting estimates.

This project assessed how copulas (a non-linear, multivariate statistical technique) can be applied to improve spatial estimation of petrophysical parameters for petroleum reservoirs and aquifers and identified opportunities to tailor these techniques for unconventional resource development. The potential for development of commercial software was also assessed.

Related Project:
Impact of Geostatistical Techniques on Technically Recoverable Resources and Fluid flow - Petrel Plug-In

PROJECT OUTPUTS

  • Research poster: Non-linear geostatistics, Centre Annual Review (2015)
  • Review: Literature review regarding current utilisation of copula-based geostatisics in geoscience and environmental applications.
  • Report: Report on capability assessment and commercial feasibility.
  • Software product: Being developed in a related project: Impact of Geostatistical Techniques on Technically Recoverable Resources and Fluid flow - Petrel Plug-In.
  • Project status: Complete
  • Project title: Non-Linear geostatistics using copulas
  • Project leader: Professor Steve Tyson
  • Research group: The University of Queensland Centre for Natural Gas (formerly known as The University of Queensland Centre for Coal Seam Gas) & The University of Queensland School of Earth Sciences
  • Timeframe: January 2015 - August 2016
  • Project funders: APLNG, Arrow Energy, Santos, QGC, University of Queensland