Multi-scale photoacoustic detection method of geological structure around borehole and related devices

A multi-scale photoacoustic detection device of geological structure around a borehole, comprising:

• a controller and a borehole probe;
• wherein,
• the borehole probe comprises a plurality of acoustic receiving transducers, arranged sequentially along an axial direction of the borehole probe;
• the controller is configured to:
• obtain depth information and direction information of the borehole;
• generate trajectory data of the borehole according to the depth information and direction information;
• obtain an optical image of the geological structure around the borehole;
• generate a first velocity model according to the optical image and the trajectory data;
• obtain low-frequency acoustic wave data and high-frequency acoustic wave data of the geological structure around the borehole;
• perform a full waveform inversion on the first velocity model according to the low-frequency acoustic wave data and the high-frequency acoustic wave data to obtain a second velocity model;
• and
• determine the geological structure around the borehole according to the second velocity model.