Directional seismic source excitation device and seismic data acquisition method

Abstract

The invention provides a directional seismic source excitation device and a seismic data acquisition method, and the device comprises an upper cover which is additionally disposed at the upper end of the device, and limits the upward transmission of the energy of an explosive seismic source or other seismic sources capable of generating blasting force; the middle tube is arranged in the middle of the device and used for containing a seismic source; a groove is formed in the middle of the device and used for containing an explosive source or other sources capable of generating blasting force to form a weak part, and the explosive source or other sources capable of generating the blasting force are guided to break through the bottom plate along the inner ring of the groove. The guide pipe is used for limiting the energy after blasting and the circumferential transmission of the broken bottom plate mass block; the sealing cover is located at the bottom of the device and used for preventing silt and the like from entering the guide pipe when the device is put into the well hole; and the fastening bolt is used for fastening the upper cover and the middle pipe. The weak part of the bottom plate of the seismic source device is impacted by the blasting force generated in the seismic source cavity, so that the bottom plate is separated from the device at the weak part, and the purpose of directional seismic source excitation is achieved.

Description

technical field [0001] The invention relates to the field of excitation methods for seismic exploration sources in geophysical exploration technology, and more specifically, relates to a directional seismic source excitation device and a seismic data acquisition method. Background technique [0002] Seismic waves in seismic exploration are generated artificially. Artificial seismic sources are generally divided into two types, one is explosive sources, and the other is non-explosive sources. The explosive source mainly adopts solid explosive explosion, detonator detonation and physical explosion (air gun, electric spark, heavy hammer, etc.), and the excitation range and service conditions of each method are relatively limited. [0003] As a traditional seismic source in the seismic exploration industry, the explosive source produces a pulse signal with strong excitation energy and a wide frequency spectrum. However, the excitation effect of the explosive source is affected ...

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Problems solved by technology

[0005] However, in some soft Gobi and sandstone formations, it is difficult to complete wells, and the inner wall of the wellbore and the soil and rocks filling the well cannot effectively limit the circumferential diffusion and upward movement of energy during blasting with explosive seismic sources, resulting in lower excitation quality of explosive seismic sources in these exploration areas. Difference

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