Geophysical survey techniques using different correlation intervals

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 a first vibratory source, of a plurality of vibratory sources, was driven using a first digital code for at least a first time interval, wherein the first digital code includes a first plurality of sub-sections corresponding to portions of the first time interval;
• imaging, by the computer system, a first location of the geological formation using a correlation of only one of the first plurality of sub-sections with the seismic data;
• and
• imaging, by the computer system, a second location of the geological formation using a correlation of two or more of the first plurality of sub-sections 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;
• driving two or more vibratory sources, of the plurality of vibratory sources, during a first time interval, wherein the driving includes:
• driving a first vibratory source using a first digital code that includes a first plurality of sub-sections corresponding to portions of the first time interval, wherein driving the first vibratory source includes continuously driving the first vibratory source for multiple iterations of ones of the first plurality of sub-sections;
• and
• driving a second vibratory source using a second digital code that includes a second plurality of sub-sections, wherein ones of the second plurality of sub-sections are uncorrelated to at least a threshold degree relative to ones of the first plurality of sub-sections;
• 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 driving the first vibratory source using the first digital code and the second vibratory source using the second digital code.

A system, comprising:

• a plurality of streamers that each include a plurality of seismic sensors;
• a plurality of vibratory sources;
• control equipment configured to:
• perform, using a first vibratory source of the plurality of vibratory sources, a first sweep for a first time interval, wherein the first sweep includes a first plurality of sub-sweeps corresponding to portions of the first time interval;
• and
• record, during the first time interval using the plurality of seismic sensors, seismic data on a tangible, computer-readable medium, wherein the seismic data is based on seismic signals generated by performing the first sweep.