As of 19 August 2018, BPZ E&P has plugged and abandoned the Delfin Sur-1X exploration well located in Block Z-1 offshore in the Tumbes Basin. The well is located approximately 2 km southeast of the Delfin-05 wildcat well drilled in 1973 which discovered oil & gas in the Lower Miocene Zorritos Formation. As dry after reaching an approximate depth of 7,250 ft (2,210 m).  The Delphin-1X spud on 15 July 2018 using the Petrex-10 rig.  The well is targeting was large structure with a proposed total of approximately 10,550 ft (3,216 m) looking at deeper formations below the Lower Miocene Zorritos and Cardalitos formations which have already proven productive to the northwest.  The 1,892.67 sq km Block Z-1 was officially awarded in January 2002 and was originally comprised of 3,144 sq km to Syntroleum Peru Holdings Ltd (95%) and BPZ Energy Inc, Sucursal Peru (5%). In March of 2004 Nuevo Energy Co acquired Syntroleum Peru Holdings Ltd working interest. Nuevo Energy Co sold its interest to Plains Exploration & Production Co who in turn sold the interest in the block to partner BPZ in February 2005. BPZ then brought in Pacific Rubiales Energy Corp in December 2012 who became Frontera Energy. BPZ was acquired by Zedd Energy Holdco Ltd in July 2015 but the company continues under the name of BPZ E&P.
Delfin Sur 1X (Zedd Energy Holdco op. 51%, Frontera Egy. 49%) in Block Z-1, offshore Jambeli sub-basin. P&A, evaluated the Miocene Zorritos Fm where hydrocarbon shows were encountered but not in sufficient quantities to justify further evaluation. TD=2203m in Miocene Heath Fm. 