Improvement In The Truncated Gaussian Method: Combining Several Gaussian Functions

Loc’h, Gaëlle Le; Beucher, Hélène; Galli, Alain; Doligez, Brigitte

doi:10.3997/2214-4609.201411149

Cited by 32 publications

(12 citation statements)

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“…This widely used approach exhibits a special feature that may be undesired in some cases: the generated facies respect a sequential ordering. However, this limitation is easily overcome with pluriGaussian simulation, which involves the truncation of at least two Gaussian random functions (Le Loc'h et al 1994). For simplicity, the description below is restricted to TGS.…”

Section: Sedimentary Facies Modelingmentioning

confidence: 99%

“…When this information is available, it can be integrated into reservoir models, provided that suitable stochastic simulation techniques are applied. For instance, Renard et al (2008) extended the well-known pluriGaussian simulation (PGS) technique (Le Loc'h et al 1994) to get the bivariate pluriGaussian simulation (Bi-PGS) one. Such a method makes it possible to populate reservoir models with spatially varying facies and to account for diagenetic phases with spatially varying influences on facies.…”

Section: Introductionmentioning

confidence: 99%

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Accounting for diagenesis overprint in carbonate reservoirs using parametrization technique and optimization workflow for production data matching

Carrera

Barbier

Ravalec

2018

J Petrol Explor Prod Technol

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Diagenesis is rarely accounted for in the standard modeling workflows for carbonate reservoirs, although it has a huge impact on both porosity and permeability. This can be explained by at least two reasons: first, it is difficult to quantify the influence of diagenetic overprints on porosity and permeability; second, the integration of the diagenetic effects in carbonate reservoir models makes history matching much more difficult. Herein, a modeling methodology is proposed, in which the diagenetic imprints are included in the reservoir model and calibrated with dynamic data. The key point consists in defining a parametrization technique able to capture these diagenetic imprints. We assume that distinct regions of occurrence of a given diagenetic phase can be identified within the reservoir. Therefore, restricting our attention to a facies, we may distinguish regions characterized by low, medium or high proportions of the targeted diagenetic phase. The advantage of this parametrization technique is that the proportions of these regions can be easily driven by a reduced number of proportionality coefficients. Then, the overall modeling approach is integrated in an optimization workflow making it possible to vary the proportions of the region with a given occurrence for a given diagenetic phase, the variograms characterizing the spatial distribution of the regions, or even the way they are spatially distributed. The optimization process is run to adjust these various unknown parameters in order to match production history. The potential of the proposed methodology is finally investigated through the study of a two-dimensional numerical example.

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Section: Sedimentary Facies Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Accounting for diagenesis overprint in carbonate reservoirs using parametrization technique and optimization workflow for production data matching

Carrera

Barbier

Ravalec

2018

J Petrol Explor Prod Technol

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“…Another powerful approach is truncated plurigaussian simulation (Le Loc’h et al 1994; Armstrong et al 2001). Compared to the previous technique, this one is based on two‐point statistics (rather than multiple points).…”

Section: Possible Reasons For the Lack Of Applicationmentioning

confidence: 99%

Stochastic Hydrogeology: What Professionals Really Need?

Renard

2007

Groundwater

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Quantitative hydrogeology celebrated its 150th anniversary in 2006. Geostatistics is younger but has had a very large impact in hydrogeology. Today, geostatistics is used routinely to interpolate deterministically most of the parameters that are required to analyze a problem or make a quantitative analysis. In a small number of cases, geostatistics is combined with deterministic approaches to forecast uncertainty. At a more academic level, geostatistics is used extensively to study physical processes in heterogeneous aquifers. Yet, there is an important gap between the academic use and the routine applications of geostatistics. The reasons for this gap are diverse. These include aspects related to the hydrogeology consulting market, technical reasons such as the lack of widely available software, but also a number of misconceptions. A change in this situation requires acting at different levels. First, regulators must be convinced of the benefit of using geostatistics. Second, the economic potential of the approach must be emphasized to customers. Third, the relevance of the theories needs to be increased. Last, but not least, software, data sets, and computing infrastructure such as grid computing need to be widely available.

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“…In this article, we investigate the applicability of the truncated plurigaussian method (Le Loc’h and Galli 1994). The principle of the method is to simulate one or several continuous Gaussian fields and to truncate them in order to produce a categorical variable.…”

Section: Introductionmentioning

confidence: 99%

“…The truncated plurigaussian simulation method provides a way of using both local and conceptual geological information to infer the distributions of the facies and then those of hydraulic parameters. The method (Le Loc’h and Galli 1994) is based on the idea of truncating at least two underlying multi‐Gaussian simulations in order to create maps of categorical variable. In this article, we show how this technique can be used to assess contaminant migration in highly heterogeneous media.…”

mentioning

confidence: 99%

Truncated Plurigaussian Simulations to Characterize Aquifer Heterogeneity

Mariethoz¹,

Renard

Cornaton

et al. 2009

Groundwater

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Integrating geological concepts, such as relative positions and proportions of the different lithofacies, is of highest importance in order to render realistic geological patterns. The truncated plurigaussian simulation method provides a way of using both local and conceptual geological information to infer the distributions of the facies and then those of hydraulic parameters. The method (Le Loc'h and Galli 1994) is based on the idea of truncating at least two underlying multi-Gaussian simulations in order to create maps of categorical variable. In this article, we show how this technique can be used to assess contaminant migration in highly heterogeneous media. We illustrate its application on the biggest contaminated site of Switzerland. It consists of a contaminant plume located in the lower fresh water Molasse on the western Swiss Plateau. The highly heterogeneous character of this formation calls for efficient stochastic methods in order to characterize transport processes.

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Improvement In The Truncated Gaussian Method: Combining Several Gaussian Functions

Cited by 32 publications

References 0 publications

Accounting for diagenesis overprint in carbonate reservoirs using parametrization technique and optimization workflow for production data matching

Accounting for diagenesis overprint in carbonate reservoirs using parametrization technique and optimization workflow for production data matching

Stochastic Hydrogeology: What Professionals Really Need?

Truncated Plurigaussian Simulations to Characterize Aquifer Heterogeneity

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