Mature Fields

Specific Challenge

Increase understanding of shallow marine subsurface geology

REGION - United States REGION - United States

United States

REGION - United States


  • Increase understanding of shallow marine subsurface geology
  • Gather real-time downhole data via LWD measurements
  • Accurately steer the BHA through 10,000-ft-long horizontal section of a complex reservoir
  • Gain operator’s confidence in deploying innovative technology


Run two independent systems and correlate results between the new and existing technology tools:

  • StrataStar deep azimuthal resistivity service — leveraging advanced, real-time inversion processing to deliver accurate reservoir and fluid boundary mapping
  • A well-established azimuthal deep resistivity system — with reliance on gamma-ray sensors



  • Revealed formation variation in sand thickness and lateral variability, confirming consistency with depositional environment
  • Achieved perfect correlation of deep resistivity measurements between the StrataStar service and established azimuthal resistivity system
  • Proved the new service’s dependable performance in a complex reservoir environment


A shallow marine depositional environment can create a complex, laterally variable sequence of thin productive sands and non-productive silts and shales. The precise mapping of these layers while drilling optimizes the well path, enhancing reservoir understanding and increasing exposure to the producing sand units. The Halliburton StrataStar™ service is designed to deliver these benefits using deep azimuthal resistivity measurements, which, when combined with advanced inversion processing, maps reservoir and fluid boundaries up to 30 ft (±9 m) from the wellbore.


The early adoption of azimuthal electromagnetic logging-while-drilling (LWD) technology by an operator of Alaska’s North Slope necessitated winning confidence in the expected results. Using this complex reservoir as a proving ground, the new StrataStar service was deployed alongside an existing azimuthal resistivity tool in a 6-3/4-in. bottom hole assembly to steer a 10,000-foot-long (3048-meter-long) horizontal section with a goal to verify comparable, if not better, downhole data.

The field trial plan: directly compare the deep resistivity measurements throughout the LWD execution while correlating the wellbore data of the advanced StrataStar service mapping capabilities with traditional techniques, such as gamma-ray sensors.


ft horizontal section


Halliburton proposed the StrataStar deep azimuthal resistivity service for its ability to provide a detailed, high-resolution inversion canvas in real time, which was ideal for conducting a rapid, reliable assessment of the Alaska North Slope subsurface geology. The solution also enabled accurate well placement decisions to optimize the well path—even in the complex marine deposits of this reservoir.

iStar™ Drilling and Logging Platform

StrataStar Deep Azimuthal Resistivity Service

Multilayer mapping for precise well placement

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Related Products

StrataStar® Service

StrataStar® Service

Deep azimuthal resistivity measurements for multilayer mapping and precise well placement.

EarthStar® Service

EarthStar® Service

Ultra-deep resistivity service mapping reservoir and fluid boundaries up to 225 feet from the wellbore.

ResiStar® Service

ResiStar® Service

Accurate resistivity from multi-frequency compensated measurements.


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