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Case Study: Resistivity Images Reveal Well Fracture Details in North Caspian Region

Data acquired while drilling identifies fractured and vuggy intervals in carbonate reservoir

Challenge: Identify fractured and vuggy intervals, characterize fractures, and determine fracture orientation in North Caspian reservoir composed of shallow marine carbonates.

Solution: Acquire resistivity data with geoVISION imaging-while-drilling service.

Result:

  • Revealed fine geological details.
  • Allowed confident identification of vugs, fractures, and bed boundaries.
  • Enabled characterization of fractures and fracture direction identification.

Identify and characterize fractures

A major operator in Russia was drilling a well in the North Caspian region and wanted to identify fractured and vuggy intervals, characterize the fractures, and determine their orientation. The target was a reservoir comprising shallow marine dolomitized and karstified carbonates.

Acquire good-quality laterolog dataset

The geoVISION service was used in the well’s 8 1/2-in horizontal section to acquire resistivity images. The section was drilled with water-base mud, which allowed a good-quality geoVISION laterolog dataset to be recorded.

Reveal fine geological details

The geoVISION dataset provided images that revealed fine geological details and allowed confident identification of vugs, fractures, and bed boundaries. When fractures identified in geoVISION images were loaded in Petrel seismic-to-simulation software and compared with fracture corridors identified on a surface seismic interpretation, there was a perfect match in fracture distribution and orientation.


Download: Resistivity Images Reveal Well Fracture Details in North Caspian Region (1.01 MB PDF)

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Resistivity Images Reveal Well Fracture Details in North Caspian RegionResistivity Images Reveal Well Fracture Details in North Caspian RegionResistivity Images Reveal Well Fracture Details in North Caspian Region
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