Geothermal Reservoir Characterization | SLB

Geothermal reservoir characterization

Illuminating the reservoir with detailed understanding

3D representation of geothermal reservoir characterization

Characterizing your geothermal reservoir

Understanding what’s beneath the surface is critical to making geothermal energy economic. Reservoir characterization helps determine rock and fluid properties of the subsurface to give insight into the geological complexity.

SLB reservoir performance experts provide a series of measurements—even in temperatures of up to 500 degF—to identify economically productive reservoirs and inform your decision making.

Fiber optic image


In geothermal projects, regulators may require continuous monitoring of the project over its lifespan. To do this, we utilize either permanent fiber or wireline-deployed fiber, depending on your project. SLB’s fiber-optic borehole seismic solution enables the real-time recording and processing of microseismic events, efficiently transmitting essential data to operators without the need for transmitting massive amounts (terabytes) of data.

Assessing the performance of injection wells is achievable through injection flow profiling solutions and standard or high-temperature production logging tools.

About fiber optics
Geological features of the geothermal reservoir, such as fault systems and fractures, have an impact on how fluids move, the integrity of the reservoir, and the risk of undesired fluid migration. Check out our suite of technologies that can measure these crucial geological characteristics—from imaging, acoustics, and integrated measurements to through-the-bit logging.

Through-the-bit logging

Through-the-bit logging services enable acquiring high-resolution subsurface data where gravitational descent on wireline is not possible or in drilled high-angle and horizontal geothermal wells. The large portfolio of measurements includes classic triple- and quad-combo suites, high-resolution laterolog, spectral gamma ray, and more.

Did you know? Cutting-edge technologies, such as our through-the-bit logging services, and domain expertise have contributed to the Department of Energy's Utah FORGE enhanced geothermal systems (EGS) project. The application of through-the-bit logging at Utah FORGE proved effective at mitigating downhole temperature challenges and enabled logging highly deviated injection wells.

Two engineers looking at data acquired from ThruBit through-the-bit logging services on their screens
The precise assessment of petrophysical properties for both the reservoir and its fluid contents serves as the basis for a comprehensive formation evaluation.


Forecasting subsurface geothermal energy extraction also requires knowledge of in situ stresses and fracture breakdown pressure. To acquire this data, we use in situ geomechanical profiling, which gives you an accurate measurement of stress, so you have more confidence in your geothermal field development.

InSitu Geomechanical Profiling breakdown pressure graph
An accurate measurement of in situ stress gives you more confidence in your geothermal field development.

Reservoir testing

With wireline formation testing, we can assess pressure dynamics within the reservoir. This helps identify factors that may contribute to heightened boiling points and improved fluid transport, consequently facilitating more effective energy conversion. The evaluation of the initial reservoir pressure and subsequent modeling plays a pivotal role in this process.

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