A New Procedure for History Matching Naturally Fractured Reservoirs
Abstract/Contents
- Abstract
- History matching, within the context of oil reservoir simulation, entails the adjustment of the geological description, or other model parameters, in order to achieve agreement between simulation predictions and actual production data. History matching of naturally fractured reservoirs is especially challenging, particularly when these models are represented using discrete fracture models (DFMs). DFMs, which represent each fracture individually, can achieve high degrees of geological realism. Standard pixel-based (i.e., Cartesian grid-based) history matching techniques cannot be applied to DFMs, however, as the DFMs are represented using generally unstructured grids. The goal of this work is to develop and test a prototype workflow for the history matching of naturally fractured reservoirs. This workflow includes two key components that are used in combination: a previously developed pixel-based history matching procedure and a calibration technique that establishes appropriate grid block parameters for the pixel models. The history matching procedure is gradient-based and applies kernel principal component analysis to represent geological models characterized by multipoint geostatistics. The calibration procedure is new and entails the use of an adjoint-based technique that determines pixel model parameters such that the flow responses from these models match those of the corresponding DFMs. The two procedures are first applied individually for two-dimensional systems containing several wells. Waterflood examples, including the effects of capillary pressure, are considered. The methods are both shown to perform reasonably well, especially for field-level quantities, when used as stand-alone applications. The prototype history matching procedure is then applied to three different (two-dimensional) systems. The method is shown to be effective for achieving field-level agreement in total injection rate and oil and water production rates. Degradation in the level of agreement is however observed in the well by well results. Although the general method does appear to have some advantageous features, additional investigation is required before it can be considered for practical problems.
Description
| Type of resource | text |
|---|---|
| Date created | April 2008 |
Creators/Contributors
| Author | Rojas Paico, Danny Hubert |
|---|---|
| Primary advisor | Durlofsky, Louis J. |
| Degree granting institution | Stanford University, Department of Energy Resources Engineering |
Subjects
| Subject | School of Earth Energy & Environmental Sciences |
|---|---|
| Genre | Thesis |
Bibliographic information
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Preferred citation
- Preferred Citation
- Rojas Paico, Danny Hubert. (2008). A New Procedure for History Matching Naturally Fractured Reservoirs. Stanford Digital Repository. Available at: https://purl.stanford.edu/yz752hc2178
Collection
Master's Theses, Doerr School of Sustainability
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