How deep?

How deep can reservoirs be detected with the TEMP-VEL technology?

The following calculations show the theoritical deep below sea floor at which sufficient responses can be obtained.

Fig. 1 - Vertical component of the current density corresponding to a water depth of 500 m.

• The upper (red dots) curve show the result corresponding to a conductive half-space without hydrocarbons,
• The other curves correspond to a half-space with a less conductive hydrocarbon layer at varying depths below sea floor, from 1 000 m down to 5 000 m by 500 m increments.

Fig. 2 - The relative contrasts obtained from the curves in figure 1 by substracting the response with hydrocarbons present from the response without hydrocarbons, and then normalizing by the hydrocarbon free values. The curve with the highest maximum corresponds to a hydrocarbon layer 1 000 m below the sea floor, while the curve with the smallest maximum corresponds to the layer 5 000 m below the sea floor.

For both figures the following parameters were used:

• Sea condustivity σ = 3S/m,
• Over-burden layer conductivity σ = 0.666S/m,
• Hydrocarbon layer conductivity σ = 0.02S/m,
• Offset Tx-Rx R = 750 m.

The blue lines show the noise floor where the signal-to-noise ratio makes further measurements meaningless.