ITALY - Longastrino Permit
The Longastrino permit is situated in the Northern Apennine foredeep, commonly known as the Po Valley Basin. Numerous gas and gas-condensate fields are located close to the permit including Ravenna, Alfonsine, San Potito, Cotignola, Dosso degli Angeli and Baldina. Recent discoveries include Agosta and Abbadesse. There are a number of proven clastic reservoir horizons in the Pliocene and Upper Miocene. Offset well data indicates average porosity of 20-25% (maximum 34%) and permeability in the range 10-400 mD can be expected. Intraformational clays, shales and marls act as seals, while the clays also have source potential to generate biogenic gas.
3D seismic section through proposed well location showing La Tosca prospect structure and amplitude anomaly.
The principle target within the Longastrino Block is the La Tosca prospect. A well defined amplitude anomaly seen on 3D seismic is present within mapped closure. The prospect is just 2km to the north-east of the Alfonsine gas field (300 Bcf) whose reservoir is the lower Pliocene Porto Corsini Formation. The Intra Lower Pliocene target reservoir is mapped as a 3-way dip closed structured trapped against a NW-SE trending thrust fault. While the primary reservoir objective is prognosed at -1,600m TVDSS, the La Tosca -1 well will be drilled to a prognosed total depth of approximately -2,500m TVDSS to test deeper secondary, probable Miocene, objectives.
The La Tosca prospect is estimated to contain 45 Bcf of gross mean prospective resource with an upside of 85 Bcf of 99.5% methane gas. Work is currently in progress to secure a site from which to drill the La Tosca-1 well, scheduled for Q2 2011.
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