Schlumberger

IPL Integrated Porosity Lithology

Integrated porosity and lithology from one modular tool simplifies formation evaluation

IPL integrated porosity lithology service delivers accurate formation porosity and lithology information by acquiring neutron porosity, natural gamma ray spectrometry, density, and photoelectric effect measurements using one modular tool.

Improved gas detection in shaly reservoirs

IPL service is effective in conditions that are usually difficult to evaluate with traditional wireline measurements, including

  • thin beds
  • shaly sands
  • mixed-lithology carbonates
  • high-salinity fluids
  • micaceous sands
  • rough or difficult hole conditions.

Neutron porosity measurement

The APS accelerator porosity sonde, which uses an electronic pulsed neutron source instead of a chemical source, is the core of the modular IPL service. The large yield of the neutron source enables epithermal neutron detection, which in combination with borehole shielding obtains porosity measurements that are only minimally affected by the borehole environment and formation characteristics, such as lithology and salinity. Five detectors provide information for porosity evaluation, gas detection, and shale evaluation with improved vertical resolution and borehole correction.

Natural gamma ray measurement

The Hostile Environment Natural Gamma Ray Sonde (HNGS) provides increased detection efficiency with spectral processing to significantly improve measurement precision and reduce environmental corrections. Sensitivity to the barite content of mud is eliminated by using only the high-energy gamma rays for analysis. Real-time corrections are made for borehole size and the borehole potassium contribution.

Density and photoelectric effect measurements

The Litho-Density photoelectric density logging tool incorporates a pad with a gamma ray source and two detectors. Magnetic shielding and high-speed electronics ensure excellent measurement stability. The Litho-Density tool records the full pulse-height spectra from both detectors and processes the information into windows. Bulk density and photoelectric effect are derived conventionally. The available spectral information is used to improve log and calibration quality control.

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Integrated Petrophysical Measurements from One Tool

This quicklook lithology evaluation demonstrates the ability of the IPL tool combination to improve lithology and porosity evaluation and gas detection in shaly sands.Tool diagram.
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