As part of the extension, the survey will cover from current 750sq km to approximately 4,000sq km, utilizing 218 data/listening stations.
The company said it will also add a geochemical survey during this current phase of fieldwork.
According to Simba, the block which is lying within a junction of two basin trends is geologically analogous to the area in Block 10BB drilled by Tullow Oil and Africa Oil.
Ernst & Young has been appointed to advise Simba on advancing the value of this asset, including a potential farm-out of Block 2A.
Operations managing director Hassan Hassan said, "This decision to expand the coverage area of passive seismic, also adding the geochem study, coupled with existing 2D, gravity and aeromagnetic surveys most definitely serves to better appraise the true extent of Block 2A’s exploration potential."
Simba holds a 100% interest in the production sharing contract (PSC) for Block 2A.
