ERHC Energy Inc (ERHE)

[Krombacher]

Ok check this out for the reason for the optional well:

Minimum Work Obligation - The Work Programme Commitment should be phased into three exploration sub periods (of 4 years, 2 years and 2 years). The Minimum Work Obligation is two wells (or the equivalent of one well worth of 3D seismic data and one well).

http://www.nigeriasaotomejda.com/Pages/Petroleum_Legislation.html

So maybe one of the wells in Phase 1 was not "worth of 3D seismic data" and so an optional well had to be drilled?

Krombacher