On 1 February 2018 the Dutch Ministry reported that Oranje-Nassau transferred its 24% interest in the A15a block to Dyas. The block is situated in the northern part of the countryâs offshore area, about 30 km southeast of the maritime border with Germany. The A15-A gas field is mainly situated in the A15a block with smaller parts in the A12a and the A12d blocks. It was discovered in 1999. Its reservoir is in Pleistocene Upper North Sea Gp below a depth of 490 m. This shallow gas discovery have multiple, stacked high-quality Tertiary sands. The area contains biogenic gas in Tertiary shallow and unconsolidated sands. Interest in the block is held by Petrogas E&P Netherlands BV (27% + operator), Dana Petroleum Netherlands BV (9%), Dyas BV (24%) and Energie Beheer Nederland BV (40%). Â 
Dyas has taken 24% interest in licence A15a from Oranje-Nassau Energie (-> 0%, Petrogas E&P 27% + Op, Dana Petr. 9%, EBN 40%).