<p>Geological storage of CO<sub>2</sub> will play a pivotal role in achieving the aspiration of ‘Net-Zero’ by 2070 in India. Due to its large lateral extent, significant thickness and potential to mineralize CO<sub>2</sub> offering permanent sequestration, Deccan basalt stands out as a significant sink. Some of the primary concerns will be to characterize the flow path in basalt and measure storage potential. In general, basalt being a fine-grained rock and exhibiting massive interlocking texture between mineral grains, is devoid of any porosity or permeability. In special circumstances, if the basalt is vesicular or fractured, it might contain a significant flow path for CO<sub>2</sub>–water mixture or supercritical CO<sub>2</sub> to flow. Most of the large igneous provinces, including the Deccan Traps, are ornamented with several dyke swarms, providing high permeability linear corridors due to intense fracturing. This study focuses on dykes from the Deccan Volcanic Province of India, estimating their permeability using Discrete Fracture Network (DFN) models and calculating storage potential in three dyke swarms (Pune–Nashik, Nandurbar–Dhule and Pachmarhi). However, dykes to surface contact pose risks of CO<sub>2</sub> leakage. In addition, dykes acting as recharge pathways might potentially lead to groundwater contamination. This paper provides a comprehensive overview of the advantages and disadvantages that a dyke swarm will impose in achieving a successful CO<sub>2</sub> mineralization project in a large igneous province like the Deccan Traps.</p>

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Evaluation of the Deccan dykes as potential CO2 sink

  • Anurag Niyogi,
  • Jyotirmoy Mallik,
  • Balram Tiwari,
  • Saptarshi Ghosh

摘要

Geological storage of CO2 will play a pivotal role in achieving the aspiration of ‘Net-Zero’ by 2070 in India. Due to its large lateral extent, significant thickness and potential to mineralize CO2 offering permanent sequestration, Deccan basalt stands out as a significant sink. Some of the primary concerns will be to characterize the flow path in basalt and measure storage potential. In general, basalt being a fine-grained rock and exhibiting massive interlocking texture between mineral grains, is devoid of any porosity or permeability. In special circumstances, if the basalt is vesicular or fractured, it might contain a significant flow path for CO2–water mixture or supercritical CO2 to flow. Most of the large igneous provinces, including the Deccan Traps, are ornamented with several dyke swarms, providing high permeability linear corridors due to intense fracturing. This study focuses on dykes from the Deccan Volcanic Province of India, estimating their permeability using Discrete Fracture Network (DFN) models and calculating storage potential in three dyke swarms (Pune–Nashik, Nandurbar–Dhule and Pachmarhi). However, dykes to surface contact pose risks of CO2 leakage. In addition, dykes acting as recharge pathways might potentially lead to groundwater contamination. This paper provides a comprehensive overview of the advantages and disadvantages that a dyke swarm will impose in achieving a successful CO2 mineralization project in a large igneous province like the Deccan Traps.