An explanation is given of both where and why there are several major steps in the reservoir characterisation and modelling process in which geostatistics are of little avail and for which other technologies must be used before geostatistics can then be invoked. A workflow is presented which overcomes one of the more intractable problems in reservoir characterisation: that of moving petrophysical properties, including saturation-dependent properties, from a fine scale to a coarser scale in the absence of suitable grids. Without a rigorous solution to this problem, the subsequent use of geostatistical algorithms to distribute what may be poor quality properties data is questionable. The solution, termed the CUSP workflow, uses a unique parametrisation based on Characteristic Length Variables (CLVs) which honour the principles of hydraulic similitude. A Bayesian-based Probabilistic Multivariate Clustering Analysis is used to carry out the Classification and Propagation of petrophysical properties based on the CLVs. The CUSP workflow is scale independent and has been implemented in readily available software. An example of the application of the workflow to move petrophysical properties from the core-plug scale to the wireline log scale is presented and an example for moving from the log scale to the geocell scale is provided.


Article metrics loading...

Loading full text...

Full text loading...


  1. Curtis, A.A.
    [2000] Lithotype Based Reservoir Characterisation: An Improved Method for Describing, Analysing and Integrating Rock Properties for Modelling. 7th EAGE European Conference on the Mathematics of Oil Recovery, Baveno, Italy, 5–8 Sep.
    [Google Scholar]
  2. [2015] Multi-scale Reservoir Characterisation from Pore Scale to Simulation Scale: Concepts and Workflows. Paper SPE 175560. SPE Reservoir Characterisation and Simulation Conference, Abu Dhabi, UAE, 14–16 Sep.
    [Google Scholar]
  3. Curtis, A. A., Eslinger, E., and Nookala, S.
    [2019] Core-Log-Geomodel Integration: Advanced Classification and Propagation Workflows for the Consistent, Rigorous, and Practical Upscaling of Petrophysical Properties. 59th SPWLA Annual Symposium, The Woodlands, TX, USA, 15–19 Jun.
    [Google Scholar]
  4. Hwang, N.
    [1981] Fundamentals of Hydraulic Engineering Systems.Prentice-Hall.
    [Google Scholar]

Data & Media loading...

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error