geothermal potential of sedimentary basins · 225kw (the machine is 250kw gross and rmotc uses 25kw...
TRANSCRIPT
GeoscienceGeoscience Needs for Geothermal Energy Needs for Geothermal Energy DevelopmentDevelopment
in Western Canadain Western Canada October 16October 16--17, 2008 Vancouver B.C.17, 2008 Vancouver B.C.
Geothermal Potential of Sedimentary BasinsGeothermal Potential of Sedimentary Basins
Dr. Dr. JacekJacek MajorowiczMajorowicz
1984A review of the state of the current - knowledge and trends
Heat flow map of N. AmericaHeat flow map of N. America --a result of cooperation of US and Canadian a result of cooperation of US and Canadian
scientistsscientists
Canadian heat flow dataCanadian heat flow data
Modified Canadian heat flow mapModified Canadian heat flow map
GeoscienceGeoscience Needs for Geothermal Energy Needs for Geothermal Energy DevelopmentDevelopment
in Western Canadain Western Canada
Geothermal Potential of Sedimentary Basins Geothermal Potential of Sedimentary Basins -- three levels of research :three levels of research :
1.1. Shallow geothermal heatShallow geothermal heat
2.2. MidMid--depths depths -- low enthalpy geothermal heating systemslow enthalpy geothermal heating systems
3.3. Deep heat to produce electricity (EGS systems)Deep heat to produce electricity (EGS systems)
1.1. ShallowShallow geothermalgeothermal heatheat 2.2. MidMid--depths depths -- low enthalpylow enthalpy
Shallow TShallow T--z logsz logs
4.5 5.5 6.5 7.5 8.5 9.5temperature, °C
200
150
100
50
0
dept
h, m
4.5 5.5 6.5 7.5 8.5 9.5
200
150
100
50
0
Winagami -the whole profiles
199319952004
°C at -50
-16-14-12-10-8.0-6.0-4.0-2.00.02.04.06.08.010.012.014.016.0
NAIN N.F.
-30-20-10
0102030
1 2 3 4 5 6 7 8 9 10 11 12
MONTH
TEM
PER
ATU
RE
(C)
MEAN MONTHLYSAT
DIFFERENCEFROM -50m
3. Deep heat to produce electricity (EGS systems)3. Deep heat to produce electricity (EGS systems)
Drilling deep is expensiveDrilling deep is expensive
Bottom hole temperatures Bottom hole temperatures -- Hinton Hinton -- EdsonEdson AlbertaAlberta
BHTs ~ 150 C
Bottom hole temperatures NW BCBottom hole temperatures NW BC
Use the equilibrium temperature not the BHT
How to predict THow to predict T--z z
Geotherms (case of the Western Canada basin heat flow 80+/-10 mW/m**2) modeling uncertainty due to heat flow, basement
temperature, conductivity and Qr and D uncertainties
0123456789
10
0 50 100 150 200 250
temperature (deg C)
dept
h (m
)
T(z) minT(z) max
Predicted deep temperature patternPredicted deep temperature pattern
In most cases you end up drilling into In most cases you end up drilling into Precambrian to get 150 C in AlbertaPrecambrian to get 150 C in Alberta
Alberta EUB TemperaturesAlberta EUB Temperatures
High temperatures ? Yes High temperatures ? Yes -- in the crystalline basementin the crystalline basement
Not only temperature; flow rates Not only temperature; flow rates are important!are important!
What do we need to find ?What do we need to find ? -- high flow /high temperature oil and high flow /high temperature oil and
gas wellgas well’’s cos co--produced fluidsproduced fluids
Latent heat energy contained in theassociated produced water that is lost by injection or discharge.
The ORMAT ORC 250kW unit is up and running in Wyoming on low temperature fluids as demonstration and testing of the equipment. It is producing a net of 225kW (the machine is 250kW gross and RMOTC uses 25kW of the power for the unit) from 22,500 bpd of 192°F (89 C) water.
Mountains to the west provide continuous recharge for the aquifers in the Tensleep and Madison formations.
ConclusionsWe have:
Limited by the data knowledge of:geothermal field
lithology and structuremost promising aquifersfractures and stress field
There is a need to:pin point potential geothermal energy target areas
increase our data base in respect to the targetsproduce atlas of geothermal resources for Canada
create demonstration – test facility/facilities