Geothermal geophysical analysis
Integrated solutions for geothermal subsurface characterization and risk reduction
Optimizing the geothermal project lifecycle
Unlocking the potential of geothermal energy starts with a precise understanding of the subsurface. Success hinges on identifying critical factors like permeability and temperature that directly impact resource viability and project outcomes. At SLB, we provide integrated, end-to-end geothermal solutions designed to reduce risk early, optimize well placement, and enhance production. By combining advanced technologies with proven workflows, we help you make confident decisions that minimize costs and maximize efficiency during the most critical phases of your project.
Our solutions leverage data-driven insights, geophysics-focused methodologies, and are powered by robust digital infrastructure, to deliver a comprehensive understanding of the subsurface. From geophysical inversion and resource evaluation to geological and geothermal modeling, our seamless workflows connect subsurface insights to drilling strategies and site development planning. This integrated approach enables faster, smarter decisions, reduces uncertainty, and accelerates project timelines. Together, we can transform geothermal exploration into a reliable and sustainable energy solution for the future.
Integration of multiple geophysical measurements can:
Magnetotellurics (MT) is a passive geophysical method that uses natural variations in the Earth’s magnetic and electric fields to study the subsurface's electrical resistivity. Unlike active techniques, MT relies on naturally occurring electromagnetic signals, making it cost-effective and always available, though it can be affected by electromagnetic noise from human activity, such as power lines or electric fences. The method provides excellent depth penetration, reaching up to 8 km, with its resolution gradually decreasing with depth. Its sensitivity to conductive materials makes it particularly effective for investigating geological features.
In geothermal exploration, MT is a key tool for understanding subsurface structures. It helps delineate faults and transform zones, which often act as pathways for geothermal fluids. It also helps identify clay caps, that typically act as seal for geothermal reservoirs in volcanic regimes, as well as deep intrusive rocks that serve as heat sources. MT is also useful for detecting granitic and salt bodies, which can influence geothermal systems. When combined with other methods, through simultaneous joint inversion (SJI), it enhances the accuracy of subsurface imaging. By providing critical insights into the resistivity structure of the Earth, MT aids in locating and characterizing geothermal resources, facilitating the development of sustainable energy solutions.
Gravity and magnetics are passive geophysical methods that examine variations in the Earth’s gravitational and magnetic fields, to investigate subsurface properties like density and magnetic susceptibility. These methods excel at detecting lateral variations but are less precise in pinpointing source depths. With their ability to penetrate deep into the Earth, they are well-suited for both regional and local-scale modeling, offering valuable insights into geological structures.
In geothermal exploration, gravity and magnetics are crucial for mapping subsurface features. They help identify lineaments and major geological structures, such as faults and intrusive bodies, which often control geothermal activity. They are also critical for estimating the depth to the igneous basement, a key factor in evaluating geothermal potential and assessing heat sources for hot, dry rock (HDR) systems.
Their cost-effective, non-invasive nature and ability to provide broad-scale insights make gravity and magnetics indispensable tools for geothermal exploration and resource development.
Seismic surveys are a valuable tool in geothermal exploration, providing detailed images of the subsurface to identify potential reservoirs and map key structural features. They are most useful when combined with other geological and geophysical data for a more comprehensive understanding of the resource.
A major advantage of 3D seismic surveys is their ability to reduce the number of dry or unproductive wells drilled. This can potentially lower long-term project costs, despite the high initial expense. Seismic methods are also highly adaptable, even in challenging settings like urban areas, where specialized techniques can deliver high-quality data.
However, while seismic data can highlight potential reservoirs, it cannot always confirm their viability or energy output and offers the greatest benefit when integrated with other geophysical methods.
What is simultaneous joint inversion (SJI)?
Simultaneous joint inversion (SJI) is a methodology used for the numerical integration of multiple geophysical measurements simultaneously. This process can help you extract valuable information about the subsurface for geothermal resource evaluation.
Where is simultaneous joint inversion suitable for use?
SJI is particularly useful in complex geological environments. In such settings, integrating different measurements is crucial for building consistent and accurate earth models.
Why is an integrated geophysical workflow key to success?
An integrated geophysical workflow can be crucial as it reduces uncertainty in the earth model. This is achieved by leveraging the strengths of multiple geophysical measurements to overcome the inherent limitations of relying on individual measurements. Additionally, SJI is a flexible tool that can be tailored to create bespoke workflows based on specific environmental challenges.
