Noise attenuation methods applied during simultaneous source deblending and separation

A method of seismic exploration above a region of subsurface containing structural or stratigraphic features conducive to determining a presence, migration, or accumulation of hydrocarbons, the method comprising:

• accessing, by a processor of a computer system, at least a portion of a seismic source survey, wherein the seismic source survey corresponds to a seismic source excitation, wherein the seismic source excitation is produced by a seismic source that imparts seismic energy into the region of the subsurface, and wherein the at least the portion of the seismic source survey comprises data corresponding to at least one time before a time of the seismic source excitation;
• separating, by the processor, a coherent signal from the at least the portion of the seismic source survey comprising the data corresponding to the at least one time before the time of the seismic source excitation via a combing and deblending operation, wherein the combing and deblending operation is an iterative operation configured to predict at least a portion of weak-coherence signals caused by the seismic source excitation, and wherein the combing and deblending operation is based at least in part on a gather comprising the at least the portion of the seismic source survey corresponding to the at least one time before the time of the seismic source excitation;
• identifying, by the processor, leaked signals that are misallocated as being associated with strong primary signals during the separating, wherein the leaked signals are associated with a previous time window before the time of the seismic source excitation;
• allocating, by the processor, the at least the portion of the leaked signals in the gather to the previous time window before the time of the seismic source excitation;
• and
• producing, by the processor, a receiver gather based on the separating and the coherent signal, wherein the receiver gather is a recording of multiple source excitations on a receiver, and wherein the receiver gather is evaluated to identify locations within the region of the subsurface that include hydrocarbon deposits and subsurface drilling hazards to determine a drilling path into the region of the subsurface for extracting the hydrocarbon deposits;
• and
• based on the receiver gather, drilling the identified locations within the region of the subsurface that includes hydrocarbon deposits and subsurface drilling hazards.