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Impacts of Methane on Carbon Dioxide Storage in Brine Formations

Journal Article · · Ground Water
DOI:https://doi.org/10.1111/gwat.12633· OSTI ID:1479685
 [1];  [2];  [2];  [2];  [3];  [4];  [3];  [2]
  1. The Ohio State Univ., Columbus, OH (United States); Univ. of Cincinnati, Cincinnati, OH (United States); Southern States Energy Board
  2. The Ohio State Univ., Columbus, OH (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. The Univ. of Tennessee, Knoxville, TN (United States)

In the context of geological carbon sequestration (GCS), carbon dioxide (CO2) is often injected into deep formations saturated with a brine that may contain dissolved light hydrocarbons, such as methane (CH4). In this multicomponent multiphase displacement process, CO2 competes with CH4 in terms of dissolution, and CH4 tends to exsolve from the aqueous into a gaseous phase. Because CH4 has a lower viscosity than injected CO2, CH4 is swept up into a ‘bank’ of CH4–rich gas ahead of the CO2 displacement front. On the one hand, this may provide a useful tracer signal of an approaching CO2 front. On the other hand, the emergence of gaseous CH4 is undesirable because it poses a leakage risk of a far more potent greenhouse gas than CO2 if the cap rock is compromised. Open fractures or faults and wells could result in CH4 contamination of overlying groundwater aquifers as well as surface emissions. We investigate this process through detailed numerical simulations for a large–scale GCS pilot project (near Cranfield, Mississippi) for which a rich set of field data is available. An accurate cubic–plus–association equation–of–state is used to describe the non–linear phase behavior of multiphase brine–CH4–CO2 mixtures, and breakthrough curves in two observation wells are used to constrain transport processes. Furthermore, both field data and simulations indeed show the development of an extensive plume of CH4–rich (up to 90 mol%) gas as a consequence of CO2 injection, with important implications for the risk assessment of future GCS projects.

Research Organization:
Southern States Energy Board, Norcross, GA (United States)
Sponsoring Organization:
USDOE Office of Fossil Energy (FE)
Grant/Contract Number:
FC26-05NT42590
OSTI ID:
1479685
Alternate ID(s):
OSTI ID: 1417124
OSTI ID: 1422790
Report Number(s):
DOE-SSEB--42590-8
Journal Information:
Ground Water, Journal Name: Ground Water Journal Issue: 2 Vol. 56; ISSN 0017-467X
Publisher:
Wiley - NGWACopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (5)

An Intelligent IoT-Based Food Quality Monitoring Approach Using Low-Cost Sensors journal March 2019
Transport of perfluorocarbon tracers in the Cranfield Geological Carbon Sequestration Project: Modeling and Analysis: Transport of perfluorocarbon tracers in the Cranfield Geological Carbon Sequestration Project journal June 2018
Convective Dissolution of Carbon Dioxide in Deep Saline Aquifers: Insights from Engineering a High-Pressure Porous Visual Cell journal September 2019
Numerical Investigation of a Methane Leakage from a Geothermal Well into a Shallow Aquifer journal November 2019
Convective dissolution of carbon dioxide in deep saline aquifers: Insights from engineering a high-pressure porous Hele-Shaw cell text January 2018

Figures / Tables (8)


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