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Title: Analytical Model to Detect Fault Permeability Alteration Induced by Fault Reactivation in Compartmentalized Reservoirs

Abstract

Underground fluid injection induces changes in in situ stress condition of the target formation and local faults that can potentially lead to fault reactivation, which may result in the leakage of injected and/or native fluids into neighboring formations. In this paper, we introduce an analytical method to detect fault reactivation caused by fluid injection into deep faulted aquifers considering across-fault leakage. The fundamental assumption made in our model is that fault permeability will be altered upon fault slip. Therefore, we model fault reactivation as a sudden change in fault permeability at the onset of fault slip. The fault is modeled as a linear interface between two permeable formations with equal rock and fluid properties. The governing equations are coupled through the fault interface and are solved using the Laplace-Fourier integral transform technique. Based on the analytical solution, we find the characteristic bottomhole pressure and pressure derivative responses that enable detecting fault reactivation using diagnostic plots. We observe that pressure derivative undergoes a rapid change at the onset of fault slip followed by a late-time trend to attain a new equilibrium governed by the altered fault permeability. Furthermore, we discuss the evolution of the across-fault leakage rate upon and after faultmore » slippage. Here, the results from this study are presented in the form diagnostic plots and type curves that may be used for reservoir and fault characterization purposes.« less

Authors:
ORCiD logo [1]; ORCiD logo [1]
  1. Louisiana State Univ., Baton Rouge, LA (United States)
Publication Date:
Research Org.:
Louisiana State Univ., Baton Rouge, LA (United States)
Sponsoring Org.:
USDOE Office of Fossil Energy (FE)
OSTI Identifier:
1539768
Alternate Identifier(s):
OSTI ID: 1467743
Grant/Contract Number:  
[FE0029274]
Resource Type:
Accepted Manuscript
Journal Name:
Water Resources Research
Additional Journal Information:
[ Journal Volume: 54; Journal Issue: 8]; Journal ID: ISSN 0043-1397
Publisher:
American Geophysical Union (AGU)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; Environmental Sciences & Ecology; Marine & Freshwater Biology; Water Resources

Citation Formats

Molina, Oscar M., and Zeidouni, Mehdi. Analytical Model to Detect Fault Permeability Alteration Induced by Fault Reactivation in Compartmentalized Reservoirs. United States: N. p., 2018. Web. doi:10.1029/2018wr022872.
Molina, Oscar M., & Zeidouni, Mehdi. Analytical Model to Detect Fault Permeability Alteration Induced by Fault Reactivation in Compartmentalized Reservoirs. United States. doi:10.1029/2018wr022872.
Molina, Oscar M., and Zeidouni, Mehdi. Tue . "Analytical Model to Detect Fault Permeability Alteration Induced by Fault Reactivation in Compartmentalized Reservoirs". United States. doi:10.1029/2018wr022872. https://www.osti.gov/servlets/purl/1539768.
@article{osti_1539768,
title = {Analytical Model to Detect Fault Permeability Alteration Induced by Fault Reactivation in Compartmentalized Reservoirs},
author = {Molina, Oscar M. and Zeidouni, Mehdi},
abstractNote = {Underground fluid injection induces changes in in situ stress condition of the target formation and local faults that can potentially lead to fault reactivation, which may result in the leakage of injected and/or native fluids into neighboring formations. In this paper, we introduce an analytical method to detect fault reactivation caused by fluid injection into deep faulted aquifers considering across-fault leakage. The fundamental assumption made in our model is that fault permeability will be altered upon fault slip. Therefore, we model fault reactivation as a sudden change in fault permeability at the onset of fault slip. The fault is modeled as a linear interface between two permeable formations with equal rock and fluid properties. The governing equations are coupled through the fault interface and are solved using the Laplace-Fourier integral transform technique. Based on the analytical solution, we find the characteristic bottomhole pressure and pressure derivative responses that enable detecting fault reactivation using diagnostic plots. We observe that pressure derivative undergoes a rapid change at the onset of fault slip followed by a late-time trend to attain a new equilibrium governed by the altered fault permeability. Furthermore, we discuss the evolution of the across-fault leakage rate upon and after fault slippage. Here, the results from this study are presented in the form diagnostic plots and type curves that may be used for reservoir and fault characterization purposes.},
doi = {10.1029/2018wr022872},
journal = {Water Resources Research},
number = [8],
volume = [54],
place = {United States},
year = {2018},
month = {8}
}

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