[3] The original licensee for Markham was a joint venture comprising Ultramar Exploration Ltd (89.50 %), DNO Offshore Ltd (8.00 %) and Ranger Oil (UK) Ltd (2.5 %.).
Windermere is a Rotliegend-Leman sandstone discovered in 1989 by well 49/09b-2 by Mobil (who named the field Avalon)[3] and had an estimated gas in place of 104 BCF or 2.8 x 106 m3.
[1] [7] J3b and J6 (NL) The Chiswick, Grove, Kew and Stamford gas fields were developed over the period 2006-2014 by four offshore installations, detailed in the table.
[1] [2] [8] In addition to the platforms and subsea wells there were also gas and methanol pipelines and umbilicals in the Greater Markham area.
[1] Gas production from Greater Markham Area fields is shown in the table and the graphs.