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Title: Development and calibration of a reactive transport model for carbonate reservoir porosity and permeability changes based on CO2 core-flood experiments

Abstract

Here, beneficial pore space and permeability enhancements are likely to occur as CO2-charged fluids partially dissolve carbonate minerals in carbonate reservoir formations used for geologic CO2 storage. The ability to forecast the extent and impact of changes in porosity and permeability will aid geologic CO2 storage operations and lower uncertainty in estimates of long-term storage capacity. Our work is directed toward developing calibrated reactive transport models that more accurately capture the chemical impacts of CO2-fluid-rock interactions and their effects on porosity and permeability by matching pressure, fluid chemistry, and dissolution features that developed as a result of reaction with CO2-acidified brines at representative reservoir conditions. We present new results from experiments conducted on seven core samples from the Arbuckle Dolostone (near Wellington, Kansas, USA, recovered as part of the South-Central Kansas CO2 Demonstration). Cores were obtained from both target reservoir and lower-permeability baffle zones, and together these samples span over 3–4 orders of magnitude of permeability according to downhole measurements. Core samples were nondestructively imaged by X-ray computed tomography and the resulting characterization data were mapped onto a continuum domain to further develop a reactive transport model for a range of mineral and physical heterogeneity. We combine these new resultsmore » with those from previous experimental studies to more fully constrain the governing equations used in reactive transport models to better estimate the transition of enhanced oil recovery operations to long-term geology CO2 storage. Calcite and dolomite kinetic rate constants (mol m–2 s–1) derived by fitting the results from core-flood experiments range from kcalcite,25C = 10–6.8 to 10–4.6, and kdolomite,25C = 10–7.5 to 10–5.3. The power law-based porosity-permeability relationship is sensitive to the overall pore space heterogeneity of each core. Stable dissolution fronts observed in the more homogeneous dolostones could be accurately simulated using an exponential value of n = 3. Furthermore, unstable dissolution fronts consisting of preferential flowpaths could be simulated using an exponential value of n = 3 for heterogeneous dolostones, and larger values (n = 6–8) for heterogeneous limestones.« less

Authors:
; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1393290
Alternate Identifier(s):
OSTI ID: 1357368
Report Number(s):
LLNL-JRNL-713709
Journal ID: ISSN 1750-5836; S1750583616303796; PII: S1750583616303796
Grant/Contract Number:  
AC52-07NA27344; LLNL-JRNL-713709
Resource Type:
Published Article
Journal Name:
International Journal of Greenhouse Gas Control
Additional Journal Information:
Journal Name: International Journal of Greenhouse Gas Control Journal Volume: 57 Journal Issue: C; Journal ID: ISSN 1750-5836
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 58 GEOSCIENCES; 02 PETROLEUM; CO2 storage; carbonate reservoirs; kinetics; reactive transport parameters

Citation Formats

Smith, M. M., Hao, Y., and Carroll, S. A.. Development and calibration of a reactive transport model for carbonate reservoir porosity and permeability changes based on CO2 core-flood experiments. Netherlands: N. p., 2017. Web. https://doi.org/10.1016/j.ijggc.2016.12.004.
Smith, M. M., Hao, Y., & Carroll, S. A.. Development and calibration of a reactive transport model for carbonate reservoir porosity and permeability changes based on CO2 core-flood experiments. Netherlands. https://doi.org/10.1016/j.ijggc.2016.12.004
Smith, M. M., Hao, Y., and Carroll, S. A.. Wed . "Development and calibration of a reactive transport model for carbonate reservoir porosity and permeability changes based on CO2 core-flood experiments". Netherlands. https://doi.org/10.1016/j.ijggc.2016.12.004.
@article{osti_1393290,
title = {Development and calibration of a reactive transport model for carbonate reservoir porosity and permeability changes based on CO2 core-flood experiments},
author = {Smith, M. M. and Hao, Y. and Carroll, S. A.},
abstractNote = {Here, beneficial pore space and permeability enhancements are likely to occur as CO2-charged fluids partially dissolve carbonate minerals in carbonate reservoir formations used for geologic CO2 storage. The ability to forecast the extent and impact of changes in porosity and permeability will aid geologic CO2 storage operations and lower uncertainty in estimates of long-term storage capacity. Our work is directed toward developing calibrated reactive transport models that more accurately capture the chemical impacts of CO2-fluid-rock interactions and their effects on porosity and permeability by matching pressure, fluid chemistry, and dissolution features that developed as a result of reaction with CO2-acidified brines at representative reservoir conditions. We present new results from experiments conducted on seven core samples from the Arbuckle Dolostone (near Wellington, Kansas, USA, recovered as part of the South-Central Kansas CO2 Demonstration). Cores were obtained from both target reservoir and lower-permeability baffle zones, and together these samples span over 3–4 orders of magnitude of permeability according to downhole measurements. Core samples were nondestructively imaged by X-ray computed tomography and the resulting characterization data were mapped onto a continuum domain to further develop a reactive transport model for a range of mineral and physical heterogeneity. We combine these new results with those from previous experimental studies to more fully constrain the governing equations used in reactive transport models to better estimate the transition of enhanced oil recovery operations to long-term geology CO2 storage. Calcite and dolomite kinetic rate constants (mol m–2 s–1) derived by fitting the results from core-flood experiments range from kcalcite,25C = 10–6.8 to 10–4.6, and kdolomite,25C = 10–7.5 to 10–5.3. The power law-based porosity-permeability relationship is sensitive to the overall pore space heterogeneity of each core. Stable dissolution fronts observed in the more homogeneous dolostones could be accurately simulated using an exponential value of n = 3. Furthermore, unstable dissolution fronts consisting of preferential flowpaths could be simulated using an exponential value of n = 3 for heterogeneous dolostones, and larger values (n = 6–8) for heterogeneous limestones.},
doi = {10.1016/j.ijggc.2016.12.004},
journal = {International Journal of Greenhouse Gas Control},
number = C,
volume = 57,
place = {Netherlands},
year = {2017},
month = {2}
}

Journal Article:
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https://doi.org/10.1016/j.ijggc.2016.12.004

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Works referencing / citing this record:

A review of geochemical–mechanical impacts in geological carbon storage reservoirs
journal, May 2019

  • Akono, Ange‐Therese; Druhan, Jennifer L.; Dávila, Gabriela
  • Greenhouse Gases: Science and Technology, Vol. 9, Issue 3
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An Experimental Study of Matrix Dissolution and Wormhole Formation Using Gypsum Core Flood Tests: 1. Permeability Evolution and Wormhole Geometry Analysis
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  • Li, Wei; Einstein, Herbert H.; Germaine, John T.
  • Journal of Geophysical Research: Solid Earth, Vol. 124, Issue 11
  • DOI: 10.1029/2018jb017238

Pore‐Scale Dissolution by CO 2 Saturated Brine in a Multimineral Carbonate at Reservoir Conditions: Impact of Physical and Chemical Heterogeneity
journal, April 2019

  • Al‐Khulaifi, Yousef; Lin, Qingyang; Blunt, Martin J.
  • Water Resources Research, Vol. 55, Issue 4
  • DOI: 10.1029/2018wr024137

An Experimental Study of Matrix Dissolution and Wormhole Formation Using Gypsum Core Flood Tests: 2. Dissolution Kinetics and Modeling
journal, November 2019

  • Li, Wei; Einstein, Herbert H.; Germaine, John T.
  • Journal of Geophysical Research: Solid Earth, Vol. 124, Issue 11
  • DOI: 10.1029/2019jb018092