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

BNB divides his sector into main two sub sector of geophysics; Surface exploration techniques and borehole exploration techniques.

SURFACE EXPLORATION TECHNIQUES:
  • Geo-Electrical Resistivity Survey
    • Survey for water exploration
    • 2D and 3D imaging for various purpose
  • Seismic survey
    • Reflection survey
    • Refraction survey
    • Downhole survey
    • Cross hole survey
    • Soil Resistivity survey
  • Self-Potential Survey
    • Electromagnetic Survey
    • Gravity Survey
    • Magnetic Survey
BOREHOLE EXPLORATION TECHNIQUES:

Borehole exploration technique is other name of geophysical logging and which may 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,
  • CALIPER LOG:

    Record borehole diameter. Changes in borehole diameter are related to well construction, such as casing or drilling-bit size, and to fracturing or caving along the borehole wall. Because borehole diameter commonly affects log response, the caliper log is useful in the analysis of other geophysical logs, including interpretation of flow meter logs.

    GAMMA RAY:

    BNB Gamma ray log is Beneficial for following purposes

  • Natural emission (cps or API units)
  • Uranium, thorium, and potassium 40
  • Clay content, alteration, and mineralogy
  • Stratigraphic correlation
  • Vertical resolution 1 to 2 ft
  • It is used in Air , water, or mud filled;
  • Open, PVC or steel cased
  • SPONTANEOUS POTENTIAL LOG:

    Record potentials or voltages developed between the borehole fluid and the surrounding rock and fluids. Spontaneous-potential logs can be used in the determination of lithology and water quality. Collection of spontaneous-potential logs is limited to water- or mud-filled open holes.

    DENSITY LOG:

    Density logging is a WELL LOGGING tool that can provide a continuous record of a FORMATION’S BULK DENSITY along the length of a BOREHOLE. The density log is useful for:

  • Evaluation of shaly sands and complex lithologies
  • Mineral identification in evaporates
  • Porosity of formation
  • SINGLE POINT RESISTANCE:

    BNB provides resistivity logging which includes follows:

  • The resistivities of sedimentary rocks are determined by the rock component types and their geometry.
  • Hydrocarbons, rock, and fresh water are all insulators (nonconductive or at least very highly resistive) to electric current flow.
  • Salt water is a conductor and has a low resistivity
  • The measurement of resistivity is a measurement of the amount (and salinity) of the formation (connate) water.

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