Broadband near-seabed deep sea geological structure acoustic detection system and method

Abstract

The invention discloses a broadband near-seabed deep sea geological structure acoustic detection system and method. The system comprises a mother ship console, an air gun sound source, an underwater sound source towed body, a horizontal sound signal receiving array and a vertical sound signal receiving array. The low-frequency transducer and the high-frequency transducer are combined and installed in a high-low mode to form an underwater sound source towed body close to the seabed, and the underwater sound source towed body is combined with a sea surface air gun sound source to form a three-dimensional broadband sound source. A horizontal sound signal receiving array, a vertical sound signal receiving array and a self-contained hydrophone array located on an underwater sound source towed body are used for receiving broadband sound signals. Compared with a conventional acoustic acquisition method, the system realizes high-penetrability and high-resolution wavelet excitation and multi-angle and multi-direction acoustic signal receiving, is more beneficial to seabed complex structure imaging, and has the advantage of exploration efficiency.

Description

technical field [0001] The invention relates to the field of marine seismic detection, in particular to a wide-band acoustic detection system and method for deep-sea geological structures near the seabed. Background technique [0002] At present, countries all over the world attach great importance to deep-sea strategic resources, and have established exploration contract areas in international seabed areas. my country also organizes voyages every year to carry out exploration of deep-sea mineral resources such as sulfide in contract areas, and gradually develops from the general stage to the fine exploration stage. [0003] In the investigation and exploration of the deep seabed geological structure and mineral resources, it is urgent to obtain the fine structure of the seabed structure and mineral resource deposits. The currently widely used acoustic detection method is to excite sound waves of a certain frequency band to the seabed, and receive the reflected echoes of the...

AI Technical Summary

Problems solved by technology

However, their narrow frequency band and high frequency (hundreds to thousands of Hz) result in insufficient formation penetration, and it is difficult to carry out detection applications in areas where bedrock such as deep-sea sulfide is exposed. The acoustic signal receiving mode cannot obtain large offset information, which affects the actual detection effect

[0005] It can be seen that the existing sea surface and deep-sea towed detection systems often have certain problems in resolution, signal-to-noise ratio and penetration depth, or it is difficult to obtain the optimum. are severely limited in practical applications such as

Images