Abstract

This paper reports on the preliminary integrated geophysical studies including several EM techniques (MT, CSAMT, TEM) and airborne -magnetic gradiometry data in the border of Parnaiba basin for groundwater assessment in Guaribas region, Piaui State in semi-arid north East Brazil. Thirty five MT-CSAMT-TEM broadband soundings (100 KHz – 0.01Hz) were completed in the area. The aerogeophysical data has been acquired and the survey area is 30 Km by 40 Km. The total coverage includes approximately 1200 line-kilometers of flight lines flown in drape survey with a 100 m terrain clearance. Two –dimensional modeling of EM data show a resistive block (resistivities ≥ than 1000 Ω.m.) crossing most of the Guaribas profile at depths varying between about 100 m and 300 m. We can also observe lower resistivity values under the intrusive resistive block. If the conductive material observed at the Guaribas profile is a porous sedimentary layer, it is very likely that it contains a good confined acquifer yet unexplored. A deep exploratory borehole should be drilled in Guaribas in order to confirm the geophysical observations.

Full Text

Published Version

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.