Method and apparatus for determining velocity of subsurface medium, and device

An apparatus for determining velocity of subsurface medium, comprising at least one processor and a memory;

• wherein the memory stores computer executable instructions;
• the at least one processor executes the computer executable instructions stored in the memory to enable the at least one processor to:
• acquire by an ocean bottom node seismic data generated by exciting a monopole source at a shot point, wherein the monopole source omnidirectionally radiates energy equally at an excitation moment;
• determine a dipole source and a zero-phase monopole source according to the monopole source, and combine the dipole source and the zero-phase monopole source to obtain a directional sub-wave;
• exchange a position of the ocean bottom node with a position of the shot point, and acquire, by the exchanged ocean bottom node, seismic synthetic data generated by exciting the directional sub-wave at the exchanged shot point;
• and
• determine a target velocity model according to an up going wavefiled of the seismic data and the seismic synthetic data, wherein the target velocity model is used to characterize a propagation velocity of a seismic wave in the subsurface medium, and the up going wavefiled represents seismic data acquired from the ocean bottom node.

A non-transitory computer readable storage medium, wherein the computer readable storage medium stores computer executable instructions, which, when executed by a processor, implements the following:

• acquiring, by an ocean bottom node, seismic data generated by exciting a monopole source at a shot point, wherein the monopole source omnidirectionally radiates energy equally at an excitation moment;
• determining a dipole source and a zero-phase monopole source according to the monopole source, and combining the dipole source and the zero-phase monopole source to obtain a directional sub-wave;
• exchanging a position of the ocean bottom node with a position of the shot point, and acquiring, by the exchanged ocean bottom node, seismic synthetic data generated by exciting the directional sub-wave at the exchanged shot point;
• and
• determining a target velocity model according to an up going wavefiled of the seismic data and the seismic synthetic data, wherein the target velocity model is used to characterize a propagation velocity of a seismic wave in the subsurface medium, and the up going wavefiled represents seismic data acquired from the ocean bottom node.