Poland's national oil and gas company Polskie Górnictwo Naftowe i Gazownictwo (PGNiG) and Chevron Polska have signed a collaboration agreement for shale gas exploration in south-eastern Poland. Under the agreement, the companies will collaborate in appraising shale gas deposits in four exploration licence areas in south-eastern Poland - two owned by PGNiG (Tomaszów Lubelski and Wiszniów-Tarnoszyn) and two belonging to Chevron (Zwierzyniec and Grabowiec). The detailed scope and schedule of exploration work will be determined by a Joint Technical Committee appointed by both parties. The joint efforts will include drilling of an exploration well. If the parties move to the second stage of collaboration, their efforts will involve further exploration work in relevant licence areas. At all stages of the relationship PGNiG and Chevron intend to jointly carry out the exploration work, determine its scope and decide on the financing methods.