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Conceptualization of the recent change in groundwater quality of the shallow aquifer of the hydrocarbon-rich Barmer sedimentary basin, Rajasthan, India

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Abstract

This paper conceptualises the factors responsible for water quality change in the aquifer on the basis of a study of flow dynamics, hydro-chemical, and bacteriological processes in a gypsum, lignite, oil, and gas-rich Barmer sedimentary basin in India. The change in colouration, odour, and presence of gases in flowing wells has been analysed. The study revealed that such a change in the quality of the water is mainly occurring in those wells that are located in the transition zone between unconfined and confined parts of the same aquifer. The field and lab analyses have further revealed the presence of pyrites, other iron-rich minerals, hydrogen sulphide (H2S), carbon dioxide (CO2), and methane (CH4) gases in the aquifer. The study suggests that changes in flow dynamics, hydro-chemical equilibrium, and microbiological processes like sulphate reduction, methanogenesis, and reverse methanogenesis are responsible for such changes in groundwater quality. The change in water quality in the unconfined parts of the aquifer is mainly due to in situ pyrite dissolution, bacteria-mediated sulphate reduction, or reverse methanogenesis taking place in the nearby confined parts of the aquifer. The presence of CH4 in non-flowing wells or while drilling new wells appears to be biogenic in nature and has migrated from deeper, confined parts of the same aquifer. The overexploitation of the aquifer has changed the flow dynamics and hydro-chemical equilibrium within the aquifer, and it has prompted the migration of gases from deeper, confined parts of the same aquifer. The water quality change is more prominent in the transitional zone between unconfined and confined parts of the aquifer.

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Acknowledgements

The author acknowledges Cairn Oil and Gas for providing the opportunity for this preliminary study while working with the company. The author is also thankful to Mr. Gopal Singh Bhati, Chief Engineer (Retd.), Public Health Engineering Department, Government of Rajasthan, for sharing the historical field data and his field observations while executing water well drilling projects in the area. The author also acknowledges the support of Ranjan Sinha, Hanuman Panwar, and Imran Khan of Cairn Oil and Gas for their assistance in the collection of field data. The opinion expressed in this paper is in no way to be treated as the opinion of Cairn Oil and Gas.

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Correspondence to Ashok Kumar.

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The author declares no competing interests.

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Responsible Editor: Broder J. Merkel

Highlights

• Over exploitation of groundwater changed flow dynamics and hydro-geo-chemical conditions in the aquifer.

• In a shallow aquifer, hydrogen sulphide, carbon dioxide, and methane gases are present.

• Both hydrogeochemical and microbiological processes are responsible water quality change in aquifer.

• Hydro-chemical change is dominant in the transitional zone of unconfined and confined parts of the aquifer.

Appendix 1

Appendix 1

Tables 9, 10, 11, 12 here.

Table 9 Ionic composition of samples collected in zone 1 (Pre-Monsoon 2018)
Table 10 Ionic composition of samples in zone 2 (Pre-Monsoon 2002)
Table 11 PHREEQC based simulation results showing pH, pe, and molality of major iron species
Table 12 PHREEQC based simulation results showing pH, pe, and saturation indices of iron-related mineral

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Kumar, A. Conceptualization of the recent change in groundwater quality of the shallow aquifer of the hydrocarbon-rich Barmer sedimentary basin, Rajasthan, India. Arab J Geosci 16, 306 (2023). https://doi.org/10.1007/s12517-023-11396-z

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  • DOI: https://doi.org/10.1007/s12517-023-11396-z

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