MicroScope Ultra
Intelligent imaging-while-drilling service
Real-time, high-resolution imaging with integrated data workflows for reliable, geology-guided drilling
AlphaSight
3D reservoir mapping and look-ahead service
Overview
See deeper, steer sooner, and land wells precisely in any resistivity environment
The AlphaSight™ 3D reservoir mapping and look-ahead service helps operators navigate complex reservoirs across every resistivity environment, including low-resistivity, low-contrast and high-resistivity, low-contrast formations. A true triaxial collocated transmitter-and-receiver antenna array, rather than the noncollocated or tilted antennas used in conventional logging-while-drilling designs, delivers deeper signal penetration and finer resolution, even in challenging formations.
AlphaSight service uses a multidepth azimuthal resistivity (MDAR) technology platform that increases both depth of detection and vertical resolution around the wellbore and ahead of the bit. Operating across a wide EM frequency spectrum—11 frequencies from 1 MHz to under 1 kHz—the service resolves boundaries and thin beds that conventional tools can miss.
In field deployments, AlphaSight service has landed a well within 1 ft of the reservoir top in a layered carbonate reservoir and detected structural boundaries up to 100 ft ahead of the bit, giving geosteering teams more time to react to changing formation conditions.
Applications
Built for environments where conventional resistivity tools struggle
- Complex or thin-bed reservoirs: Triaxial measurements from AlphaSight service sharpen boundary detection for confident navigation.
- High-angle and extended-reach wells: Real-time geosteering decision support helps maintain trajectory control in high-angle sections.
- Offshore and deepwater development: By mapping the reservoir ahead of the bit, AlphaSight service helps reduce risk and avoid costly rig time and sidetracks.
- Low-resistivity shale and salt-adjacent formations: When low contrast masks boundaries, the wide frequency range of AlphaSight service improves detection in low-resistivity, low-contrast conditions.
- Relief well planning and anticollision ranging: AlphaSight service enables accurate ranging for precise positioning relative to an existing wellbore.
- Infill and field development wells: Look-around inversion improves well placement and reservoir contact in complex, mature reservoirs.
Case Studies
From 1-ft landings to 75-ft look-ahead detection: AlphaSight service field results
Across four field deployments, AlphaSight service landed a well within 1 ft of the reservoir top, mapped layers as thin as 2-ft TVD, and detected structural boundaries up to 75 ft ahead of the bit.
Vertical_Align_Top
Landed within 1 ft of the reservoir top
In a layered carbonate reservoir in Kuwait, Kuwait Oil Company used AlphaSight service to land a gas-producing well within a 1-ft window below the reservoir top with no sidetracks.
Layers
Mapped layers as thin as 2-ft TVD, 75 ft ahead of the bit
In North Kuwait's Sabriyah field, AlphaSight service detected faults up to 75 ft ahead of the bit and mapped formation layers as thin as 2-ft true vertical depth, enabling faster ROP without sacrificing data quality.
Avg_Pace
Rated to 302 degF and 30,000 psi
Field runs and synthetic modeling in North America confirmed accurate boundary detection and resolution of both vertical and horizontal resistivity under HPHT conditions, establishing a new benchmark for inversion time to bit.
Nest_Detect
Detected heterogeneities up to 70 ft ahead of the bit
Drilling an offshore lateral through complex, meandering channel sands, AlphaSight service identified pinchouts and structural heterogeneities up to 70 ft ahead of the bit in a single run, reducing sidetrack risk and shortening decision time.
Features
Novel triaxial collocated antennas
Deliver unprecedented measurement accuracy and petrophysical insight
At-bit multidepth HD electromagnetic inversion
Accelerates precise geosteering on a single advanced platform
Downhole processing capability
Enables autonomous optimization of EM performance
Richer and wider EM firing frequency range
Achieves ~2× depth of detection and true horizontal look-ahead capability
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Frequently asked questions about AlphaSight service and resistivity logging while drilling
What is azimuthal resistivity logging while drilling?
Azimuthal resistivity logging while drilling measures resistivity in multiple directions around the wellbore in real time, so operators can see approaching bed boundaries, faults, and fluid contacts before the bit reaches them. AlphaSight service extends this with a triaxial, collocated antenna design that improves both depth of detection and vertical resolution compared with conventional tilted-antenna tools.
How does a triaxial collocated antenna design improve resistivity measurements while drilling?
A triaxial collocated antenna arrangement measures resistivity in three orthogonal directions from the same physical location on the tool, avoiding the calibration errors and blurred boundaries that noncollocated or tilted-antenna designs can introduce. In field deployments, this design has helped operators map layers as thin as 2 ft TVD and land wells within 1 ft of a target reservoir top.
When should operators choose a multidepth azimuthal resistivity service over a conventional deep azimuthal resistivity tool?
A multidepth azimuthal resistivity (MDAR) service is the better fit when a well passes through low-resistivity, low-contrast formations, thin beds, or complex faulted structures where a single-depth tool may not resolve enough detail. AlphaSight service captures shallow, medium, deep, and ultradeep measurements simultaneously, so operators do not have to choose between near-wellbore precision and long-range look-ahead detection.
How far ahead of the bit can look-ahead resistivity detect boundaries and faults?
Detection range depends on formation resistivity contrast and frequency selection. In field deployments, AlphaSight service detected faults and structural heterogeneities 70 to 75 ft ahead of the bit, giving geosteering teams more time to adjust the trajectory before intersecting a boundary.
What temperature and pressure ratings does AlphaSight service support?
AlphaSight service is rated to 150 degC [302 degF] and 207 MPa [30,000 psi]. Field runs in North America and synthetic modeling confirmed performance under HPHT conditions.
Related products
The AlphaSight service is part of a broader family of SLB mapping-while-drilling and imaging-while-drilling services. Depending on formation complexity, well trajectory, and required at-bit resolution, these related services extend reservoir mapping, bed-boundary detection, and borehole imaging across the drilling program.
Map the reservoir ahead in 3D
SLB geoscience and drilling teams bring decades of azimuthal resistivity experience to help you plan, deploy, and interpret data from AlphaSight service for your field.
