Piedra Sola and Salto.

An excellent first-mover opportunity.

Targeting multiple/different objectives in the Norte Basin, an asset with the resource potential normally associated with major oil companies.
Piedra Sola and Salto concessions in Uruguay cover 3.5 million acres (held via a 41% interest in Schuepbach Energy International LLC).

With increasing international attention turning to Uruguay after first hydrocarbons discovered in 2017 and successful offshore licensing, the onshore assets in the Piedra Sola and Salto concessions represent an excellent first-mover opportunity for Warrego. Schuepbach International Holdings LLC are currently funding and managing this project. Netherland, Sewell and Associates, Inc. (“NSAI”), as at 14 May 2015, have independently certified an unrisked gross Prospective Resource in the Salto and Piedra Sola concessions of up to 910 MMBBL oil and 3,105 BCF gas (up to 373 MMBBL oil and 1,273 BCF gas to Warrego’s net 41% interest).


Piedra Sola Salto Concessions Uruguay In October 2012 Warrego (formerly Petrel) acquired an interest in a large petroleum project in Uruguay. The project comprises two concessions, Piedra Sola and Salto, covering 14,000 km2 (3.5 million acres) which are held under separate production sharing contracts.

Warrego's initial entry was acquired with a US$2.5 million investment for 25% of Schuepbach Energy International LLC (SEI), a private US company, holding the Piedra Sola and Salto concessions and an 85% interest in two prospective gas licences in southern Spain. Warrego (formerly Petrel) exercised an option to increase its SEI shareholding to 51% for US$5.5 million in December 2013. 

In December 2017 Warrego's (formerly Petrel's) partner in SEI failed to fund its share of a cash call. Warrego (formerly Petrel) funded its US$2.04 million 51.0% share and also exercised a US$1 million option to increase its SEI interest from 51% to 62.7%. In April 2018 Petrel reduced its interest in SEI to 41% in return for a 97.5% interest in the Tesorillo Project in Cadiz Spain.

Attractions of the Norte Basin

Core rig, Uruguay The Norte Basin in Uruguay forms part of the same oil-producing Devonian basin system which extends into neighbouring Parana Basin in Brazil. It is also productive in Bolivia and Argentina but largely unexplored in Uruguay. 

Uruguay is a stable democracy with an excellent working environment, including ready access to oilfield services and equipment from nearby Argentina and Brazil. Uruguay currently imports 40,000 bopd for domestic consumption into the La Teja refinery in Montevideo.

The initial attractions of the Uruguay venture were:
  • Intensive technical work by Dr Martin Schuepbach since 2007 indicated the presence of a previously unknown rift basin which is prospective for unconventional oil hosted in Devonian shales, conventional oil in similar age sandstones and the possibility of hybrid plays akin to the Bakken. Data from shallow coreholes drilled on the basin margin together with evidence from water wells provides anecdotal evidence of hydrocarbons;
  • The two concessions cover a vast 14,000 km2 (3.5 million acres) and are held under separate production sharing contracts with attractive fiscal terms;
  • Uruguay was an emerging target for international energy companies where the government had recently conducted a very successful offshore licensing round with companies such as BP, BG and Total acquiring offshore permits;
  • French major Total had also recently acquired two onshore unconventional concessions to the north of SEI's concessions;
  • Warrego's staged investment allowed for a disciplined assessment of the licences with each stage designed to yield data pertinent to early resource characterisation.

Three-Year work Program

The programme not only seeks to confirm the quality and extent of source rock and conventional reservoirs but also test the validity of AVO (gas target) anomalies identified on seismic. If successful the programme will add great value to shareholders and could make Uruguay energy self-sufficient reducing Uruguay's trade deficit by $1Bp.a

The initial three-year work program for both concessions consisted of a combination of a magnetotelluric (MT) electromagnetic survey, drilling two coreholes and seismic data acquisition. 

MT Survey

The magnetotelluric (MT) electromagnetic survey, completed in early 2013, was acquired across the Piedra Sola and Salto concessions with results confirming the existence of a northwest-trending rift basin with Devonian and potential Permian sediments. In addition to basin delineation, the MT survey assisted in identification of corehole locations designed to characterise basic reservoir parameters, resource extent and potential resource size.


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