The CB OS/2 block is located in the shallow waters of the Cambay Basin on the west coast of India. Four notable discoveries have been made on the block Lakshmi Gauri CBX and Ambe. Three of these Gauri Lakshmi and CBX have been commercialised. The initial development of the CB OS/2 block focused on the Lakshmi and Gauri gas fields. The oil bearing formations in these fields were developed in 2007.