The characterization, analysis and modeling of hard rock reservoirs is a central part of the development of Enhanced Geothermal Systems (EGS). Reservoir rocks need to be analyzed for their native stress state and potential modes of fracturing and may already be naturally fractured before stimulation. Approaches to understand the reservoir and design a development strategy will be discussed.

This session will present geothermal projects in sedimentary reservoirs, with a focus on reservoir engineering and characterization. Several reservoir characterization methods will be reviewed. The challenges of classical pressure transient analysis (PTA) and other flow-based analysis for geothermal reservoirs evaluation will be addressed, together with the applicability of temperature transient analysis as a way to further characterize reservoir properties and development potential.

In recent years, innovative projects have breathed new life into the field of Enhanced Geothermal Systems (EGS). This session will review new developments and future outlook.

This session will address key geomechanical concerns for geothermal developments including:

• the influence of high temperature and pressure on rock behavior
• reservoir access issues for geothermal developments
• geomechanical concerns for high temperature, fractured formations

This session will discuss the need for geothermal resource assessment and the principles of geothermal resource quantification. It will focus on resource assessment at different stages of maturity of a geothermal project, from exploration to mature assets.

This session covers the principles of heat extraction through closed-loop systems and working fluids. Advantages, challenges, innovation and case studies will be reviewed to discover the potential of unlimited heat extraction.

This session will cover the unique aspects of drilling and completing geothermal wells. The session will also discuss the primary differences between oil and gas (O&G) wells and geothermal wells, as well as how O&G techniques have been adapted for geothermal applications.

Efficient operation of geothermal systems would require continuous monitoring of well performance and identifying well issues. Therefore, what aspects of surveillance are unique for geothermal systems?

In this session, we will explore the current practices, future requirements, and promising methods for reservoir and well surveillance including novel technologies (data-driven methods coupled with new measurement techniques).