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Modeling of flow in faulted and fractured media

Abstract

The work on this thesis has been done as part of a collaborative and inter disciplinary effort to improve the understanding of oil recovery mechanisms in fractured reservoirs. This project has been organized as a Strategic University Program (SUP) at the University of Bergen, Norway. The complex geometries of fractured reservoirs combined with flow of several fluid phases lead to difficult mathematical and numerical problems. In an effort to try to decrease the gap between the geological description and numerical modeling capabilities, new techniques are required. Thus, the main objective has been to improve the ATHENA flow simulator and utilize it within a fault modeling context. Specifically, an implicit treatment of the advection dominated mass transport equations within a domain decomposition based local grid refinement framework has been implemented. Since large computational tasks may arise, the implicit formulation has also been included in a parallel version of the code. Within the current limits of the simulator, appropriate up scaling techniques has also been considered. Part I of this thesis includes background material covering the basic geology of fractured porous media, the mathematical model behind the in-house flow simulator ATHENA and the additions implemented to approach simulation of flow through fractured  More>>
Authors:
Publication Date:
Mar 01, 2004
Product Type:
Thesis/Dissertation
Report Number:
NEI-NO-1534
Reference Number:
RN05145271; TVI: 0520
Resource Relation:
Other Information: TH: Thesis (Dr Scient)
Subject:
02 PETROLEUM; PETROLEUM; RESERVOIR FLUIDS; RESERVOIR ROCK; NORWAY; OIL FIELDS; PETROLEUM GEOLOGY; EXPLORATION; NATURAL GAS DEPOSITS; PETROLEUM DEPOSITS; GEOLOGIC FAULTS; COMPUTERIZED SIMULATION; NUMERICAL SOLUTION; A CODES; POROSITY; FLUID FLOW
OSTI ID:
20656654
Research Organizations:
Bergen Univ. (Norway). Dept. of Physics
Country of Origin:
Norway
Language:
English
Other Identifying Numbers:
Other: ISBN 82-92160-27-2; TRN: NO0505440
Availability:
Commercial reproduction prohibited; OSTI as DE20656654
Submitting Site:
NW
Size:
158 pages
Announcement Date:

Citation Formats

Oeian, Erlend. Modeling of flow in faulted and fractured media. Norway: N. p., 2004. Web.
Oeian, Erlend. Modeling of flow in faulted and fractured media. Norway.
Oeian, Erlend. 2004. "Modeling of flow in faulted and fractured media." Norway.
@misc{etde_20656654,
title = {Modeling of flow in faulted and fractured media}
author = {Oeian, Erlend}
abstractNote = {The work on this thesis has been done as part of a collaborative and inter disciplinary effort to improve the understanding of oil recovery mechanisms in fractured reservoirs. This project has been organized as a Strategic University Program (SUP) at the University of Bergen, Norway. The complex geometries of fractured reservoirs combined with flow of several fluid phases lead to difficult mathematical and numerical problems. In an effort to try to decrease the gap between the geological description and numerical modeling capabilities, new techniques are required. Thus, the main objective has been to improve the ATHENA flow simulator and utilize it within a fault modeling context. Specifically, an implicit treatment of the advection dominated mass transport equations within a domain decomposition based local grid refinement framework has been implemented. Since large computational tasks may arise, the implicit formulation has also been included in a parallel version of the code. Within the current limits of the simulator, appropriate up scaling techniques has also been considered. Part I of this thesis includes background material covering the basic geology of fractured porous media, the mathematical model behind the in-house flow simulator ATHENA and the additions implemented to approach simulation of flow through fractured and faulted porous media. In Part II, a set of research papers stemming from Part I is presented. A brief outline of the thesis follows below. In Chapt. 1 important aspects of the geological description and physical parameters of fractured and faulted porous media is presented. Based on this the scope of this thesis is specified having numerical issues and consequences in mind. Then, in Chapt. 2, the mathematical model and discretizations in the flow simulator is given followed by the derivation of the implicit mass transport formulation. In order to be fairly self-contained, most of the papers in Part II also includes the mathematical model. Thus, the main purpose of this chapter is to go into more details on the various parameters and derivations compared to the papers. Details of the ATHENA simulator is presented in Chapt. 3, including both earlier and recent additions. The main focus of this chapter is on code development issues like platform portability, 'safe' parallel programming and general improvements. Due to the code specific details, the content of this paper is for the most part not covered in the Part II papers. Chapt. 4 includes the domain decomposition framework and details on the parallel implementation. Based on the fault modeling aspects introduced in Chapt. 1, a brief review of existing numerical fracture flow techniques are given in Chapt. 5. Also, a hierarchical approach for including fractures at different scales within the ATHENA simulator is given here. This includes both discretization issues and methods for up scaling. After summary and conclusions in Chapt. 6, Part I ends with Chapt. 7 including suggestions on further work within the ATHENA simulator framework in particular and on numerical techniques for fractured porous media flow in general.}
place = {Norway}
year = {2004}
month = {Mar}
}