VIBRATION SEISMIC SURVEY METHOD Russian patent published in 2024 - IPC G01V1/00 G01V1/02 G01V1/28 

FIELD: geophysics.

SUBSTANCE: disclosed is a vibration seismic survey method, which includes exciting continuous seismic vibrations using a reference sweep signal generated by a vibration source, recording of vibrations by seismic receivers and cross-correlation or deconvolution of recorded records using a reference signal. Method is characterized by the fact that the desired pulse shape signal is converted into an equivalent base sweep signal, into the phase spectrum of which delays corresponding to the inverse filter of the subsurface are introduced. It is proposed to use a pre-created pulse signal of one form or another for solving various tasks, for example, compensation of amplitude-phase transmission losses, suppression of multiple waves, stimulation of oil recovery from geological formation and many others. Such a pulse signal cannot be directly emitted into the geological medium by existing pulse sources of excitation, such as an explosion in a well, a falling weight or a pneumatic source, due to their limited controllability. In the method, a given pulse signal is converted into an equivalent vibration signal (sweep), which is emitted into the geological environment and the recorded response is correlated while maintaining phase characteristics of the emitted signal. Thus, full controllability of the seismic source is achieved provided that it is vibratory. Method does not impose restrictions on the characteristics of the converted pulse signal and is universal. Method employs a carrying standard sweep signal with a linear or other sweep. Changes corresponding to spectral characteristics of the converted pulse signal are introduced into this sweep by an iterative algorithm. In order to preserve phase characteristics of the propagating signal, its correlation is carried out with a sweep on the recorder, into which phase delays contained in the initial pulse are not introduced.

EFFECT: high resolution of the method regardless of the shape of the desired signal.

1 cl, 1 dwg