SPWLA/DGS Geothermal workshop

The thermal conductivity of salt is higher than that of basalt.

• True
• False

From which geological phenomena can geothermal energy be obtained? (select all that applies)

• Hot springs
• Salt domes
• Volcanic activity
• Proximity to a glacier (through heat pump)

What does "low enthalpy geothermal energy" mean?

• Low-enthalpy geothermal energy is a type of sustainable energy that leverages the Earth’s natural heat to generate power. Unlike high-enthalpy geothermal energy, which relies on high temperatures found deep underground, this geothermal energy captures the relatively lower-temperature thermal energy located close to the surface of the Earth.
• Enthalpy is the measurement of energy in a thermodynamic system. The quantity of enthalpy equals to the total content of heat of a system, equivalent to the system's internal energy plus the product of volume and pressure.

What is the Curie Point in the geothermal context?

• It is the depth at which the temperature reaches 580 degC and where the rock undergoes a sharp change (drop) in its magnetic properties.
• It is the depth at which the temperature reaches 680 degC and where the rock undergoes a sharp change (drop) in its magnetic properties.
• It is the depth at which the temperature reaches 680 degC and where the rock undergoes a sharp change (drop) in its elastic properties.

In high enthalpy systems, the alteration of clays into smectite leads to

• high conductivity layers that can be picked up by magneto-telluric surveys
• high conductivity layers that can be picked up by gravity surveys
• low conductivity layers that can be picked up by magneto-telluric surveys

In geothermal systems, sources of heat can be (select all that applies):

• volcanic (magma, lava)
• non volcanic (radioactive decay in granite)
• meteoric

Are magneto-telluric (MT) surveys deep or shallow? Are time-domain electromagnetic (TEM) surveys deep or shallow?

• MT=deep, TEM=shallow
• MT=shallow, TEM=shallow
• MT=deep, TEM=deep

ORC stands for

• organic Rankine cycle
• original Rankine cycle
• organic rutile cycle

Ambient air temperature has a direct impact on geothermal plants efficiency.

• False
• True

Evaluating geothermal wells with logging-while-drilling has the advantage of decreasing the maximum temperature the tools are experiencing through:

• Cool mud circulation around the tools
• Thick LWD tools collar
• Drill-pipe conveyance