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Services > Wireline Logging Services > Resistivity Logging Services
Resistivity Logging Services
   

Resistivity services

  • High-Definition Induction Log
  • Dual Phase Induction Log
  • Dual Induction -Focused Log
  • Dual Laterolog
  • High-Definition Lateral Log
  • Micro-Resistivity Focused Logging
  • Thin-Bed Resistivity log
  • Shallow investigation electrical instruments

High-definition Array Induction Log
The HDIL subsurface tool is a multi-receiver, multifrequency, fully digital array-type induction device. The data can be processed in a variety of ways, depending on the environment and the client's needs. For complicated interpretation scenarios such as thin beds (down to 1 ft. thickness) or deep or unusual invasion, it is the service that provides the answers.
Applications

  • Multiple receivers provide 6 depth of investigation from 10 to 120 in., for determining Rt & invasion profile.
  • Selectable presentation of true resolution data or 1 ft, 2 ft, or 4 ft resolution-matched data.
  • HDIL data are well suited for advanced processing methods such as inversion, resistivity profile, and dipping formations.
  • Correlation.
  • Formation evaluation, including hydrocarbon/water contact.

Dual Phase Induction Log
The Dual Phase Induction Log measures formation conductivity with three different depths of investigation. These measurements can be used to determine the conductivity of the undisturbed formation, even in the presence of deep invasion. The DPIL* also measures the spontaneous potential (SP), which can be used to aid lithology determination.
The three conductivity measurements consist of the Shallow Focused Laterolog (SFL) and medium and deep induction measurements.
Applications

  • Determine formation conductivity/resistivity
  • Determine depth of investigation
  • Correlation
  • Formation evaluation, including hydrocarbon/water contact

Dual Induction-Focused Log
The dual induction-focused log provides data from four measurements performed simultaneously. These include resistivity curves made by a deep investigation induction, a medium investigation induction, and a shallow investigation focused device. Also, a spontaneous potential measurement is made to aid in lithology identification.
Applications

  • Determine formation resistivity. As with all induction tools, accuracy is highest at lower resistivities
  • Determine depth of invasion
  • Correlation
  • Formation evaluation, including hydrocarbon/water contact

Dual Laterolog
Dual Laterolog tools are electrode tools designed to produce reliable formation resistivity measurements in boreholes containing saline drilling fluids. They operate by "focusing" a survey current into the formation. Dual Laterolog instruments are superior to induction instruments in high resistivity (>100 ohm-m) formations and/or well-bores with drilling fluids more conductive than the in-situ formation waters.
Applications

  • Determine formation resistivity in saline mud systems and high formation resistivities
  • Qualitatively indicate permeability
  • Formation evaluation, including hydrocarbon/water contact

High-Definition Lateral Log
The High-Definition Lateral Log (HDLL*) service, a new-generation array-type galvanic measurement logging service, provides formation resistivities at multiple depths of investigation in conductive, water-based drilling mud systems. The combination of the HDLL system_ high-vertical resolution and deep-investigating measurements with inversion processing provides a detailed analysis of formation resistivity (Rt), flushed zone resistivity (Rxo), and depth of invasion. The HDLL subsurface tool utilizes a single-current injection electrode and 18 measurement electrodes. The injection current and injection potential are acquired as well as a set of selected potentials (U), first differences (V), and second differences (W) of the measurement electrodes. These measurements provide more accurate formation resistivity data than conventional systems in thinly bedded hydrocarbonbearing reservoirs and in the presence of deep drilling fluid invasion. Using HDLL data results in a better reservoir description, more accurate water saturation (Sw) determination, and a detailed evaluation of the drilling fluid invasion profile.
Applications

  • More accurate formation resistivity, water saturation, and reserves estimates
  • Better determination of movable fluids and recovery factor Improved evaluation of thinly bedded reservoirs
  • Superior measurements in deeply invaded formations
  • Detailed evaluation of the drilling fluid invasion profile
 

Micro Sphericaly Focused Logging
Micro Sphericaly Focused Logging (MSFL) uses padmounted electrode systems. This tool measures flushed zone resistivity (Rxo). The Rxo measurement is used in calculating flushed zone water saturation (Sxo) and, when use with deeper reading resistivity measurements from other devices, in indicating movable hydrocarbons, in determining true formation resistivity (Rt), and in estimating invasion diameter (di). MSFL tool has very-fine vertical resolution and is excellent for delineating thin beds.
MSFL tool is used in both fresh and salt muds, and runs in combination with both Dual Induction and Dual Laterolog tools. Gamma and Caliper logs are recorded routinely with this tool.
Applications

  • Measure flushed zone resistivity
  • Calculate flushed zone water saturation
  • Indicate movable hydrocarbons
  • Estimate invasion diameter
  • Correct deeper-reading resistivity devices for invasion effects
  • Delineate thin beds

Thin Bed Resistivity Tool
The Thin-Bed Resistivity tool provides high vertical resolution previously associated only with micro-resistivity devices, yet it has a depth of investigation in the range of 13 to 21 in. (330 to 533 mm). As a result, under ideal shallow invasion conditions, the TBRT service can be used to measure formation resistivities in beds less than 2 in. (51 mm) in thickness. Even when invasion is deeper, TBRT provides an excellent indication of hydrocarbons in thin beds, and is the best choice for bed identification when thin bed processing is done to enhance the resolution of standard resistivity tools.
Applications

  • Determine flushed zone resistivity in thin beds

Shallow Investigation Electrical Instruments
The Micro Laterolog, Minilog, Proximity Log, and Micro Spherical Laterolog are pad-type tools used to measure the resistivity adjacent to the wellbore. They all have a shallow depth of investigation, responding primarily to mud cake resistivity and/or flushed zone resistivity. A caliper curve is recorded simultaneously with the resistivity data, showing mud cake thickness and washouts.
Micro Laterolog (MLL)
The Micro Laterolog tool has a limited depth of lateral investigation and better vertical resolution than the Minilog. It responds primarily to the resistivity of the flushed zone adjacent to the wellbore. Although usually Shallow Investigation Electrical lnstruments run in salt mud, the Micro Laterolog can also be run in fresh mud where mudcake is thin.
Minilog (ML)
The Minilog combines two resistivity measurements. Primarily reading mudcake resistivity, the short-spaced electrode measures laterally about 1.5 in. (38.1 mm). The long-spaced electrode measures both mudcake and formation resistivity up to 4.0 in. (101.6 mm) away from the pad.
Proximity Minilog (PROX)
The Proximity Minilog is the freshwater mud equivalent of the Micro Laterolog. It is a focused electrode pad device combined with a Minilog. Stronger focusing and the ability to read deeper into the formation are the advantages of the Proximity Minilog.
Applications

  • Measure flushed zone resistivity (Rxo)
  • Locate porous and permeable zones
  • Detect movable oil
  • Determine net pay
     
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