Application of Microgravimetry to Assessing Collapse Risk in Carbonate Sinkhole Areas, Cheria Basin, Northeast of Algeria

Abstract

This study presents the results and the interpretation of a microgravity survey realized in the MChentel zone near Cheria tone situated in the Northeast Algerian. The microgravity survey, made during April and March, 2016, allowed the obtaining of 614 measures distributed on the whole zone of study. The gravimetric data were measured by means of a gravimeter relative GNU-KC 444 were used with location and the height of stations with centimetric precision by pocket GPS and an electronic theodolite type Qeo FET 420 k. The gravimetric data measured on the ground were connected with a reference gravimetric station situated near the zone of study. On the scale of the zone of study, the gravimetric data show a decrease of the values of the anomaly of Bouguer between both collapses. This trend implies probably an effect of karstification which would explain the decrease of the values of the anomaly of Bouguer by going to the center of the studied zone. The interpretation of gravimetric data shows the presence essentially of two negative zones, they present a deficit of in-depth mass which can be 30 meters.

Fast Inversion Approach for Modeling Gravity Data: Varying Synthetic and Real Cases

“…These methods have been widely used in oil and gas exploration, mineral exploration, cavity finding, archeological site exploration, geothermal investigation, basin configuration and structures of the subsurface. (Panisova and Pasteka, 2009;Araffa et al, 2015;Bouhlassa et al, 2017;Uwiduhaye et al, 2018;Rezaie, 2019;Al-Farhan et al, 2019;Kumar et al, 2020;Essa and G´eraud, 2020;and Abedi, 2020) However, despite the success of these methods, they are not without limitations. (Tarantola, 2005) In particular, the inversion of the gravity data can be nonunique, making the inverse problem a poor setting.…”