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"Access depth" is defined as the depth at which an exploration well intercepts the target reservoir. If this depth is below the hydrocarbon-water contact you will not make a discovery even if the prospect "works" in every other respect. Access depth introduces a new sort of risk. Access depth can be defined for each prospect. See Prospect - access depth for more detail.
Access depth is one of the consolidation input dialogs:

Use access depth |
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A check box allowing you to easily disable use of any access depths - convenient to see the effect of them |
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File |
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The consolidation entry. Only eligible entries are shown - it must be a proper prospect, using area/depth as GRV input. |
Depth |
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The access depth. This can be quite independent of any access depth deined for hte prospect (but of course you can retrieve it, if there is one, using "Get access depths" below. You can leave this entry blank - access chance is set to 100% |
Top & base contour |
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The top and base contour level for the prospect. |
Access chance |
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Access chance associated with the access depth |
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Get access depths |
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Get any access depth entered for each input prospect |
Clear all depths |
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Remove all access depths from the table. |
The results
When using access depths the consolidation summary shows a "Chance of success". This includes any access chance for an individual entry. Without access depth the chance is described as "Geological chance GPOS".