Geophysical survey techniques using selective-length processing

A non-transitory, computer-readable medium having instructions stored thereon that are executable by a computer system to perform operations comprising:

• accessing, by the computer system, seismic data for a geological formation, wherein the seismic data is recorded, using one or more sensors, during a seismic survey in which one or more of a plurality of vibratory sources were used to perform a first sweep during a first time interval;
• imaging, by the computer system, a first location of the geological formation using a correlation of only a first portion of the first sweep with the seismic data;
• and
• imaging, by the computer system, a second, deeper location of the geological formation using a correlation of an entirety of the first sweep with the seismic data.

A method of manufacturing a geophysical data product, the method comprising:

• towing a plurality of streamers that each include a plurality of seismic sensors;
• towing a plurality of vibratory sources;
• performing, using one or more of the plurality of vibratory sources, a first sweep for a first time interval;
• and
• recording, during the first time interval using the plurality of seismic sensors, seismic data on a tangible, computer-readable medium, thereby creating the geophysical data product, wherein the seismic data is based on seismic signals generated by performing the first sweep.