Geological and Geophysical Mapping

Geophysical methods are recognized worldwide as cost-effective tools of investigation for ascertaining information about the subsurface. GEOENGINEERS has created an in-house capability of conducting geophysical surveys for groundwater, pollution studies, mineral exploration and engineering site investigation.

GEOENGINEERS divides its sector into main two sub-sectors of geophysics; Surface Exploration Techniques and Borehole Exploration Techniques.

SURFACE EXPLORATION TECHNIQUES

GEO- ELECTRICAL RESISTIVITY SURVEY

Vertical Electrical Soundings (VES) with Schlumberger configuration are conducted to delineate groundwater potential aquifer zones. Vertical Electrical Soundings (VES) at the site are observed to study the subsurface lithology.

The results of the investigations obtained by using electrical resistivity software are presented in tabulated form, indicating the interpreted thickness and resistivity of the subsurface layers

• 2D and 3D imaging for various purposes

SEISMIC SURVEY

The seismic survey can explain subsurface discontinuities, layering, and probable rocks/structures. It is suitable for the investigation of coal, oil and gas, groundwater, and massive metallic deposits. A 3D seismic survey outlines the basin configuration and resource estimate. An exploration seismograph is used for following the seismic survey.

• Reflection survey

• Refraction survey
• Downhole survey

• Cross hole survey

BOREHOLE EXPLORATION TECHNIQUES

Borehole exploration techniques are a synonym for geophysical logging and are helpful for identifying the following:

• Physical rock characteristics

• Porosity
• Pore geometry
• Permeability
• Depth to lithological boundaries
• Lithology identification
• Minerals grade/quality
• Inter-borehole correlation
• Structure mapping
• Dip determination
• Rock strength
• In-situ stress orientation
• Fracture frequency
• Fluid salinity
• Identify productive zones,

• Determine depth and thickness of zones

 

GEOPHYSICAL LOGGING

Geophysical logging is very useful tool to help recognize aquifer zone and lithology of borehole. The logs acquired from boreholes are used to interpret aquifer zone and the lithologies encountered in the borehole during drilling.

Geophysical log represents the thickness of aquifer zone, the aquifers identified after qualitative interpretation of natural gamma, SP and SPR logs are tabulated indicating the top, bottom, thickness and lithologies.

The geophysical logs are generally included in water well exploration program for aquifer zone recognition and stratigraphic identification and the rank, quality, and its thickness, besides other methods of exploration.

VIDEO LOGGING

Our equipment has the competence to facilitate the customer requirement by going down-hole to capture the real-time condition with the extensive range of up to 500m.

The Video logger complete system can photograph or film during the investigation. Also, comments and explanations can be saved for any documentation/record of your project. Performing a video inspection can determine the causes of the most common problems that can affect a well during its productive life, such as the presence of sand and a decrease in water flow. Furthermore, it can detect abnormalities such as deterioration, deformation, corrosion, cracks and excessive deposit on the bottom.

The Video logger can assess situations of risk from degradation and the appropriate measures needed to repair the well. Maintenance can therefore be conveniently scheduled according to the typical characteristics of the groundwater and resulting problems. It also helps to rapidly complete the missing documentation for existing wells (total depth, depth of installation of the filtering features, type of pipes and efficiency) and to check the actual conditions before performing costly repair work.