OREANDA-NEWS. May 17, 2011. Tethys Petroleum Limited ("Tethys" or the "Company") (TSX: TPL) provided an update on the progress in its Kazakhstan oil appraisal and exploration activities, reported the press-centre of KASE.

The AKD04 (Dero) appraisal well has now reached total depth of 2,566 metres and electric logging has been carried out. This well is located on the separate Dero part of the structure to the east of the AKD01 Doris oil discovery and was designed to ascertain the potential in the Upper Jurassic carbonate zone and the edge of the Lower Cretaceous (Aptian) sandstone in this area. Interpretation of the well data shows both the Jurassic carbonate and the Aptian sand to be  present in the well with both showing indications of hydrocarbons.

These two horizons were the zones that tested oil in the AKD01 well. Preparations are currently being made to run casing which will be followed by an appropriate testing programme - following receipt of the usual consents from Kazakh authorities.