The map below is a reduced size of the original, which is an oil and gas pipeline and field map of Algeria. It's hosted on the site mem-algeria.org and doesn't have any other credits on the map. (Not for use in navigation.)
MEM stands for Ministère de l’Energie et des Mines; this is an official map from that ministry of the Algerian government.
The incident of late – see Bloomberg News story of 18 January 2013 – focus on the complex at the Amenas Gas Field; a detail of this map is below, showing Amenas (labelled here as "In Amenas") near the border with Libya.
BP: "BP in Algeria" with maps of In Amenas, though not at this detail; full sized map (PDF)