Metric Space

Pre-History Match Screening of the Prior Model

History matching is tremendously time-consuming for the reservoir engineer.  And, without question, a great deal of effort by reservoir engineers has been expended trying to history match models where there have been faulty or incorrect assumptions and interpretations input into the model.  Ideally, these assumptions and interpretations, which we denote as the "prior model", should be test before launching into the time-consuming history matching process.

History Matching in Metric Space

An extremely useful aspect of MDS is that we can visualize the location of the true reservoir (yellow "cross" in the figure below) and compare it to the set of reservoir models in space.  This comparison is useful for pre-history match screening. 

Metric space methods - key concepts

Introduction

In mathematics, a metric space is a set where a distance (called a metric) is defined between elements of the set.

Sensitivity Analysis and Screening

What is Sensitivity Analysis?  What is Screening?

The purpose of sensitivity analysis is to:
  • Aid in the understanding of reservoir dynamics
  • Quantify the impact of the engineering and geological assumptions on reservoir behavior
  • Identify the important uncertain parameters for history matching and uncertainty quantification

The purpose of screening is to select models which have particular features or characteristics.

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