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Title: Characterizing the Impact of Fractured Caprock Heterogeneity on Supercritical CO 2 Injection

Abstract

We present a set of multiphase flow simulations where supercritical CO 2 (scCO 2) displaces water at hydrostatic conditions within three-dimensional discrete fracture networks that represent paths for potential leakage through caprock above CO 2 storage reservoirs. The simulations are performed to characterize and compare the relative impact of hydraulic and structural heterogeneity in fractured media on the initial movement of scCO 2 through these caprock formations. In one scenario, intrinsic fracture permeabilities are varied stochastically within a fixed network structure. In another scenario, we generate multiple independent, identically distributed network realizations with varying fracture network densities to explore a wide range of geometric and topological configurations. Analysis of the simulations indicates that network structure, specifically connectivity and the presence of hanging fractures, plays a larger role in controlling the displacement of water by scCO 2 than variations in local hydraulic properties. Finally, we identify active surface area of the network as a single-phase feature that could provide a lower bound on the percentage of the network surface area reached by scCO 2.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Dept. Water Resources and Drinking Water, EAWAG, Dubendorf (Switzerland); ETH Zurich (Switzerland); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE Office of Fossil Energy (FE), Clean Coal and Carbon (FE-20); USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1601404
Report Number(s):
LA-UR-19-25316
Journal ID: ISSN 0169-3913
Grant/Contract Number:  
89233218CNA000001; 20180621ECR
Resource Type:
Accepted Manuscript
Journal Name:
Transport in Porous Media
Additional Journal Information:
Journal Volume: 131; Journal Issue: 3; Journal ID: ISSN 0169-3913
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; 97 MATHEMATICS AND COMPUTING; 54 ENVIRONMENTAL SCIENCES; Discrete fracture networks; Multiphase flow; Active surface area; Carbon sequestration; Fractured porous media

Citation Formats

Hyman, Jeffrey De'Haven, Jimenez-Martinez, Joaquin, Gable, Carl Walter, Stauffer, Philip H., and Pawar, Rajesh J. Characterizing the Impact of Fractured Caprock Heterogeneity on Supercritical CO2 Injection. United States: N. p., 2019. Web. doi:10.1007/s11242-019-01372-1.
Hyman, Jeffrey De'Haven, Jimenez-Martinez, Joaquin, Gable, Carl Walter, Stauffer, Philip H., & Pawar, Rajesh J. Characterizing the Impact of Fractured Caprock Heterogeneity on Supercritical CO2 Injection. United States. doi:10.1007/s11242-019-01372-1.
Hyman, Jeffrey De'Haven, Jimenez-Martinez, Joaquin, Gable, Carl Walter, Stauffer, Philip H., and Pawar, Rajesh J. Thu . "Characterizing the Impact of Fractured Caprock Heterogeneity on Supercritical CO2 Injection". United States. doi:10.1007/s11242-019-01372-1.
@article{osti_1601404,
title = {Characterizing the Impact of Fractured Caprock Heterogeneity on Supercritical CO2 Injection},
author = {Hyman, Jeffrey De'Haven and Jimenez-Martinez, Joaquin and Gable, Carl Walter and Stauffer, Philip H. and Pawar, Rajesh J.},
abstractNote = {We present a set of multiphase flow simulations where supercritical CO2 (scCO2) displaces water at hydrostatic conditions within three-dimensional discrete fracture networks that represent paths for potential leakage through caprock above CO2 storage reservoirs. The simulations are performed to characterize and compare the relative impact of hydraulic and structural heterogeneity in fractured media on the initial movement of scCO2 through these caprock formations. In one scenario, intrinsic fracture permeabilities are varied stochastically within a fixed network structure. In another scenario, we generate multiple independent, identically distributed network realizations with varying fracture network densities to explore a wide range of geometric and topological configurations. Analysis of the simulations indicates that network structure, specifically connectivity and the presence of hanging fractures, plays a larger role in controlling the displacement of water by scCO2 than variations in local hydraulic properties. Finally, we identify active surface area of the network as a single-phase feature that could provide a lower bound on the percentage of the network surface area reached by scCO2.},
doi = {10.1007/s11242-019-01372-1},
journal = {Transport in Porous Media},
number = 3,
volume = 131,
place = {United States},
year = {2019},
month = {11}
}

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