Low frequency acquisition with towed streamers

A method and apparatus for generating a geophysical data product by a process of: acquiring standard-offset survey data for a subterranean formation with a standard-offset survey spread towed at a standard-offset spread depth; acquiring long-offset survey data for the subterranean formation with a long-offset streamer towed at a long-offset streamer depth; and assembling the long-offset survey data into a set of grouped-long-offset survey data characterized by a plurality of receiver groupings and a group length. A method, includes: towing a standard-offset survey spread at a standard-offset spread depth; acquiring standard-offset survey data for a subterranean formation with the standard-offset survey spread; towing a long-offset streamer with a vessel at a long-offset streamer depth; acquiring long-offset survey data for the subterranean formation with the long-offset streamer; and assembling the long-offset survey data into a set of grouped-long-offset survey data characterized by a plurality of receiver groupings and a group length.