Session 4D: Identifying and Imaging Geothermal Reservoirs/Improvements to Downhole Logging and Instrumentation

Identifying and Imaging Geothermal Reservoirs

There are many ways to imagine the geothermal reservoir. This includes the Drilling, Stress Analysis, Geological Mapping, Geochemistry Investigation, Magnetotelluric Survey, Dense Seismic Array, and Airborne LIDAR/Gravity/Magnetics. However, the most important issue which are concerned by the geothermal investors are: What is the resolution? When the result may be reliable? Which the case will be applied? Where the example can be found? And how effective is the method? In this session, we will examine various methods modelers use to identify and image geothermal reservoirs. 

Improvements to Downhole Logging and Instrumentation

Geothermal wells and their respective high-temperature downhole conditions impose different demands on drilling and logging tool technologies, which can impact the ability to maintain an accurate control on the measurement accuracy.  In recent years, technologies have been developed specifically for geothermal applications which address some of the limitations of traditional downhole sensors used primarily by the oil and gas industry.  Due to the relative increase in complexity for accessing geothermal resources, these unique challenges are now being addressed by the service sector to ensure the wells are drilled and completed in an effective manner.  The vagaries of geothermal well logging can include high temperature, large temperature variations between well interventions as well as significant changes in the wellbore temperature profile, corrosive conditions, scale, and large boreholes.  These are all factors that impose limitations on the ability to acquire accurate and reliable data for applications such as the drilling of highly deviated wells through fractured granitic geologic formations, accurate wellbore placement and logging data in proximity of neighbouring offset wells, and subsequently monitoring of wall thinning and build-up of scale in production tubulars. An understanding of the methods employed in maintaining accurate data QA/QC and sharing best practices will contribute to increased confidence in the evolution of geothermal resource development, which will, ultimately, enhance the management of assets.

4:30 PM - 4:50 PM: Exploration of Ain Al-Harrah-Al-Lith Geothermal Field in Saudi Arabia using EM methods | Pantelis Soupios 
4:50 PM - 5:10 PM: Comprehensive Study of Geology to Geomechanic for Delineating Sweet Spot Map in Geothermal Field. Study Case: Utah FORGE, USA | Sri Mulyani 
5:10 PM - 5:30 PM: Magnetotelluric Data Acquisition in a High-Noise Environment: Results from the Steamboat Hills Geothermal Complex, Nevada, USA | Daniel Feucht 
5:30 PM - 5:50 PM: Using helicopter time-domain electromagnetic (HTEM) resistivity surveys with supporting geoscience to target temperature gradient wells and discover hidden geothermal systems in the US Basin and Range | Steve Sewell 
5:50 PM - 6:10 PM: Optical Multi-Component Seismic Array for Long-Term Monitoring of Geothermal Wells | Jakob Haldorsen
6:10 PM - 6:30 PM: Diagnosing Common Geothermal Well Challenges with High Temperature, High-Resolution Video Technology | Johanna Waldheim