Intrinsic and specific groundwater vulnerability using the GOD method as a pre-operational baseline assessment of an unconventional hydrocarbon industry [post]

Gustavo Filemon Costa Lima, Vinícius Gonçalves Ferreira, Jussara da Silva Diniz Lima, Joyce Castro de Menezes Duarte, Ana Cecília Dufilho, Carlos Alberto de Carvalho Filho
2021 unpublished
In the middle of the São Francisco basin, the sub-basins of Indaiá and Borrachudo river highlight the considerable potential for unconventional hydrocarbon exploration. The present study seeks to evaluate the groundwater resource's intrinsic and specific vulnerability in the Indaiá and Borrachudo basins as an environmental baseline study for further development in the shale gas industry. The overlay and index GOD method was applied to assess the aquifer's intrinsic susceptibility regarding the
more » ... roundwater confinement (G), the Overlying Strata (O), and the Depth of the groundwater table (D). The specific vulnerability assessment considered the intrinsic vulnerability and the land cover/use of the area, concerning the diversity and the toxicity of pollutants inherent in each anthropogenic activity. The results indicate that 52.69%, 25.12%, and 17.57% of the aquifer area have Medium, High, and Extreme intrinsic vulnerability, respectively. The specific vulnerability assessment suggests an overall vulnerability reduction due to the low anthropogenic stress on the basin. Three gas research wells overlay moderate intrinsic vulnerability. One well is above the high vulnerability area, which concerns how the unconventional industry could develop regarding groundwater susceptibility in this ecosystem.
doi:10.21203/rs.3.rs-274642/v1 fatcat:c2i6xtmr6nd3ngrs6eih2ngyaq