The gravity geophysical method detects the gravity field variations on the earth surface related with the subsoil density distribution. From these results is possible to locate formations, reservoirs, basement and other structures with density contrast.
3D Inversion and Modeling of Magnetoteluric (MT), Induced Polarization (IP) and potential methods (Gravity – Magnetometry) data. Wellfield counts on important data processing centers in Santiago, Chile and Buenos Aires, Argentina, equipped with legally licensed specific software and with 500 parallel processing cores to handle large datasets with short timing.
Magnetotellurics is a geophysical passive technique which permits to map the subsoil electrical resistivity distribution, from shallow up to several thousand meters depth. It is applied to the Earth crust and mantle investigation as well as to oil & gas, geothermal, groundwater and mining explorations. This method records both the Earth electric and magnetic fields in stations located on the ground surface. The relation among these 2 fields, in the frequency domain, is named as “impedance tensor” and is directly related to the underneath subsoil electrical resistivity distribution.
The Electrical Resistivity Tomography (ERT) allows obtaining 2D sections and 3D models for the subsoil resistivity distribution. The difference with the related and simpler VES technique is the much higher measurements density and the 2D/3D algorithms to model and interpret data. ERT is a contact method which uses a set of several electrodes installed on the surface along a profile (2D) or according a regular mesh (3D). Direct current injection into subsoil through pairs of electrodes allows voltage measurements between other electrodes pairs. A switching device, configured according specific protocols, automatically performs all the possible combination, of injection and voltage electrodes pairs, resulting in high density data laterally as well as with depth. This data set allows a detailed reconnaissance of the subsoil electrical resistivity distribution.
This tool is ideal to provide high resolution details on well casing conditions at depth. Several fingers allow detecting small anomalies, easing the finding of deformations, incrustations or casing metal thinning caused by corrosion. The tool counts on 20 to 80 fingers, depending on well casing diameter.
Cement Bond Log (CBL), Variable-Density Log (VDL) and Casing Collar Locator (CCL) services offer a complete evaluation of well wall and casing to reduce the uncertainty about hydraulic isolation quality in the production zone, making possible more efficient well refining operations at a minimum cost.
Porosity well log based on slowing down and capture of neutrons by the hydrogen contained in the subsoil formations. This technique allows registering the correct porosity for specific formations, (limestone, sandstone, dolomite), assuming that formation pores are fluid-filled and in units related to formation type (vol/vol or u.p.). The measurement is statistical and based on thermal neutron detection, so precisions is higher for high counting speed, i.e. low porosity.
Gamma Ray log is used to discriminate different lithologies through their specific natural radioactivity, and for Uranium exploration. Gamma ray count increments can be related to lithological changes, alterations and radioactive mineralizations.