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Площадь: 282041.84 км²
Tindouf basin
Geological Setting
The Tindouf Basin is located in the far southwestern portion of Algeria, bordered on the west by Morocco and on the south by Mauritania. This large basin, the least explored basin in the Sahara Desert Platform, covers an area of over 45,000 mi2 just within the Algeria.
Because of limited well penetrations, considerable uncertainty surrounds the shale gas and oil potential of the Tindouf Basin. Based on recent data from Sonatrach, the Devonian Frasnian Shale is relatively thin (average of 10 m) with a TOC of only about 1%.10 As such, this shale unit has been excluded from further quantitative assessment. However, the Silurian Tannezuft Shale appears to be more promising. We have established a dry and wet gas prospective area of 29,140 mi2 for the Silurian Tannezuft Shale in the northern portion of the Tindouf Basin where the TOC is 2% or higher, Figure 1.
Figure 1. Tindouf Basin Silurian Tannezuft Shale Outline and Thermal Maturity
Reservoir Properties (Prospective Area)
The depth of the Silurian Tannezuft Shale in the prospective area ranges from 6,600 to 14,000 ft, averaging about 10,500 ft. While the total Upper Silurian section can be several thousand feet thick, the organic-rich portion of the Silurian Tannezuft Shale has a net thickness of only 54 ft where the TOC exceeds 2%. In the prospective area, the Tannezuft Shale is in both the wet gas/condensate and the dry gas windows (Ro > 1.0%) and has gas-prone Type III kerogen. Figure 2 provides a cross-section for this frontier hydrocarbon basin.
Figure 2. Tindouf Basin Cross Section
Resource Assessment
Within its 23,800-mi2 dry gas prospective area, the Silurian Tannezuft Shale in the Tindouf Basin has a resource concentration of 24 Bcf/mi2. Within its 5,340-mi2 wet gas and condensate area, the shale has resource concentrations of 19 Bcf/mi2 for wet gas and 1.7 million barrels/mi2 for oil/condensate.
Within its overall 29,140-mi2 prospective area, the risked resource in-place for the Tannezuft Shale in the Tindouf Basin is estimated at 135 Tcf of wet/dry shale gas and 2 billion barrels of shale oil/condensate. Of this, 26 Tcf of wet/dry shale gas and 0.1 billion barrels of shale oil/condensate are estimated as the risked, technically recoverable resource.
Data source: Technically Recoverable Shale Oil and Shale Gas Resources: Algeria.
U.S. Energy Information Administration (EIA). 2013
Следующий Бассейн: Sabatayn