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Statistical Pattern Recognition and Geostatistical Data Integration

  • Jef Caers
  • Sanjay Srinivasan
Part of the Studies in Fuzziness and Soft Computing book series (STUDFUZZ, volume 80)

Summary

Statistical pattern recognition, particularly the neural network approach, has found many applications in reservoir characterization, enabling the use of multi-variate, imprecise and uncertain reservoir data. Geostatistics is a well-established field for 3D spatial modeling and uncertainty quantification of the reservoir facies and petro-physical properties. In this paper we present a theoretical and practical framework for developing and applying pattern recognition tools within the traditional geostatistical framework. We show that the power of soft computing tools within a geostatistical framework allows the modeler to make maximum use of the reservoir data. Geostatistics aims at integrating geophysical and reservoir engineering data, yet at the same time honoring geological continuity information provided by well data or by analog outcrop information. However, the traditional geostatistical framework does not allow an easy integration of “non-linear” reservoir data. Due to the nature of the governing physical laws, seismic amplitude data and production history data both exibit a non-linear and multiple point relationship with petrophysical properties such as porosity and permeability. In this paper we show how statistical pattern recognition tools can be integrated into traditional and novel geostastical simulation methods in order to deal with the imprecise and non-linear aspects of reservoir data. Probabilistic type neural networks such as the proposed logistic regression network are ideal tools to model the probabilistic relation between reservoir data and reservoir properties. The output of these types of neural networks is a conditional probability, rather than the single estimate provided by more traditional neural networks. A framework is presented where these networks can be integrated within any geostatistical simulation algorithm. We provide two examples of this novel approach. First we show how neural networks axe trained to build a non-linear relation between seismic amplitude data and reservoir facies. The trained neural network is used to constrain a fluvial reservoir to seismic amplitude data. A second example shows the worth of using neural networks in understanding and calibrating the non-linear relationship between the permeability heterogeneity and well test response data. The resultant neural network calibrated relationship is then used to condition multiple reservoir models to well test data using an iterative Gaussian simulation method.

Keywords

Markov Chain Monte Carlo Seismic Data Training Image Pressure Profile Permeability Model 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2002

Authors and Affiliations

  • Jef Caers
    • 1
  • Sanjay Srinivasan
    • 2
  1. 1.Petroleum EngineeringStanford UniversityStanfordUSA
  2. 2.Petroleum EngineeringUniversity of CalgaryAlbertaCanada

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