Approaches to large scale unsaturated flow in heterogeneous, stratified, and fractured geologic media

Ababou, Rachid

doi:10.2172/138205

Cited by 23 publications

(13 citation statements)

References 67 publications

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“…Une des techniques d'homogénéisation la plus connue est celle développée par Oda (1986) et améliorée depuis par Ababou (1991). Elle permet de prendre en compte non seulement l'ouverture et l'orientation de chacune des fractures, mais aussi leur extension, ainsi que leurs caractéristiques mécaniques.…”

Section: Détermination Des Caractéristiques Hydromécaniques éQuivalenunclassified

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Modélisation du comportement hydromécanique d’un versant calcaire poreux et fracturé – Impact de simplifications géométriques et d’une homogénéisation des propriétés hydromécaniques sur la qualité des prédictions

2016

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-Cet article présente une analyse numérique de résultats d'essais d'injection et de pompage réalisée dans le site laboratoire de Coaraze avec mesures simultanées en forage de variations de pressions hydrauliques et de déformations. Le site de Coaraze est un petit réservoir calcaire poreux et fracturé (échelle décamétrique) qui affleure à une trentaine de kilomètre au nord de Nice. Nous avons développé des approches tridimensionnelles pour simuler le comportement hydromécanique des fractures les plus importantes couplé avec celui d'un milieu poreux équivalent représentant la matrice rocheuse intacte et les autres fractures. Nous avons, en particulier, évalué l'impact de simplifications géométriques et d'homogénéisations sur la qualité des prédictions du comportement hydromécanique du réservoir durant les expérimentations. Inclure dans le modèle uniquement les fractures "clé", jouant un rôle important hydrauliquement et/ou mécaniquement, s'avère aussi efficace qu'exécuter une homogénéisation prenant en compte l'ensemble des fractures.

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Section: Détermination Des Caractéristiques Hydromécaniques éQuivalenunclassified

“…Ces caractéristiques équivalentes sont déterminées selon une démarche d'homogénéisation numérique mise au point antérieurement (Ababou, 1991 ;Min et al, 2004 ;Oda, 1986 ;Thoraval et Renaud, 2004). Il s'agit tout d'abord d'identifier la géométrie de chacun des « blocs » à homogénéiser (matrice découpée par des fractures secondaires).…”

Section: Introductionunclassified

Modélisation du comportement hydromécanique d’un versant calcaire poreux et fracturé – Impact de simplifications géométriques et d’une homogénéisation des propriétés hydromécaniques sur la qualité des prédictions

2016

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“…In the context of subsurface hydrology and toxic waste contamination, extensive field investigations have shown that the hypothesis of random field heterogeneity is consistent with observed spatial distribution of material properties and with the resulting contamination patterns. A comprehensive review of field measurements, including both saturated and unsaturated as well as continuous and fhctured media, can be found in Ababou (1991).…”

Section: A Elastic Wave Propagation In Random Geological Media: 1d Smentioning

confidence: 99%

Characterization of fracture reservoirs using static and dynamic data: From sonic and 3D seismic to permeability distribution

Parra¹,

Hackett²,

Brown³

et al. 1998

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This report has been reproduced directly from the best available copy. 111. INTRODUCTION AND SUMMARY OF PROJECT A. BackgroundIn low porosity, low permeability zones, natural fractures are the primary source of permeability which affect both production and injection of fluids. The open fractures do not contribute much to porosity, but they provide an increased drainage network to any porosity. They also may connect the borehole to remote zones of better reservoir characteristics. An important approach to characteag the fracture orientation and fiacture permeability of reservoir formations is one based on the effects of such conditions on the propagation of acoustic and seismic waves in the rock.The objective of this project is to evaluate acoustic logging and surface seismic measurement techniques as well as fluid flow and transport methods for mapping permeability anisotropy and other petrophysical parameters in a fracture reservoir. We w i l l also determine fracture connectivity using multiphase production data.The work includes theoretical and numerical model studies linked with a balanced petrophysical and engineering program for the development of advanced concepts of borehole and surface seismic to understand the reservoir fracture system and to predict fracture coNKctivity using multiphase production data.The project is organized in three phases. Phase I includes the development of theoretical models using deterministic interwell seismic solutions, petrophysical analysis, and rapid simulation of multiphase flow in reservoirs using a semianalytic streamline approach. Phase 11 includes the development of theoretical models using stochastic solutions, fractured connectivity using inversion of production data, and interwell seismic and sonic logs signal analysis. Phase III includes numerical modeling, analysis, and integration of geophysical and petrophysical data, and application of the inversion method to production data and reconciliation with geophysical data to characterize fr-acture reservoirs.In this second year annual report, the topics of research have been slightly modified h m those originally proposed. The reasons for the modifications is given below. Thus, the second year of this project involves petrophysical analysis and basic theoretical analysis in geophysics and petroleum engineering. Geophysical techniques include the analysis of plane-harmonic seismic waves in a random geological media, development of scattering correction techniques for extracting the intrinsic properties of the media, and several processing techniques that are required to interpret well logs and interwell seismic data at the Buena Vista H i l l s field. Petroleum engineering techniques include the development of an inversion method for production data and reconciliation with geophysical data. The petrophysical analysis consists of evaluating the Buena Vista H i l l s field (partially owned by Chevron) and completing the evaluation of the Twin Creek fractured reservoir (owned by Union Pacific Resources) in the overthr...

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“…Fracture modelling techniques have been summarized by Sagar and Gureghian (1991). In addition, Ababou (1991) has discussed the effective permeability of a fracture network. The scope of fracture models is very large and currently under extensive investigation.…”

Section: A8 Consideration Of Fracturesmentioning

confidence: 99%

“…Within the scope of this research project, however, fracture modeling is afforded limited investigation. For more extensive developments, the reader is referred to Gureghian and Sagar (1991) and Ababou (1991) among others. Three of the techniques, known as the effective-continuum, the dual-continuum, and explicit representation z.re briefly discussed here.…”

Section: A8 Consideration Of Fracturesmentioning

confidence: 99%

Theoretical and experimental investigation of thermohydrologic processes in a partially saturated, fractured porous medium

Green¹,

Manteufel

Dodge³

et al. 1993

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The performance of a geologic repository for high-level nuclear waste will be influencedto a large degree by thermohydrologic phenomena created by the emplacement of heat-generating radioactive waste. The importance of these phenomena is manifest in that they can greatly affect the movement of moisture and the resulting transport of radionuclides from the repository. Thus, these phenomena must be well understood prior to a definitive assessment of a potential repository site. For this reason the Thermohydrology Research Project was initiated, An investigation has been undertaken along three separate avenues of analysis to attain the objectives of the research project: (i) laboratory experiments, (ii) mathematical models, and (iii) similitude analysis. A summary of accomplishments to date is as follows. s A comprehensive review of the literature on the theory of heat and mass transfer in partiallysaturatedporous medium was completed and documented.

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Approaches to large scale unsaturated flow in heterogeneous, stratified, and fractured geologic media

Cited by 23 publications

References 67 publications

Modélisation du comportement hydromécanique d’un versant calcaire poreux et fracturé – Impact de simplifications géométriques et d’une homogénéisation des propriétés hydromécaniques sur la qualité des prédictions

Modélisation du comportement hydromécanique d’un versant calcaire poreux et fracturé – Impact de simplifications géométriques et d’une homogénéisation des propriétés hydromécaniques sur la qualité des prédictions

Characterization of fracture reservoirs using static and dynamic data: From sonic and 3D seismic to permeability distribution

Theoretical and experimental investigation of thermohydrologic processes in a partially saturated, fractured porous medium

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