RU1801220C - Method for excitation of seismic waves - Google Patents

Abstract

Usage: in seismic exploration when using explosives (J3B). SUMMARY OF THE INVENTION: Excitation of seismic waves is carried out using two identical linear continuous explosive charges. They are placed from each other at a distance of 0.7-2.6 of the radius of the zone of plastic deformation of the linear charge. Depth of 0.7 m or more. Two subversive initiators are used to undermine.

Description

The invention relates to seismic exploration and is intended for seismic exploration using explosives.

The aim of the invention is to increase the signal to noise ratio by eliminating the direct collision of detonation fronts along the charge axis.

The goal is achieved in that at a distance equal to 1.7-2.6 of the radius of the plastic deformation zone of the linear explosive charge, an additional continuous linear explosive charge identical to the main one is placed, while the explosive charges are placed in parallel in the same plane and close to geotechnical conditions x at a depth of 0.7 m or more, an additional charge of explosives is equipped with initiating means on the opposite side to the main side and simultaneously undermine them.

The implementation of the method in production mode is carried out in the following sequence.

The project for the production of seismic surveys includes a method of exciting seismic waves using continuous linear explosive charges, which include blasting technology, the name of explosives and explosive devices (CB), the length of linear charges, the mass of explosives per 1 m length, estimated distance between charges, depth of immersion of charges in the soil, method of initiating charges.

Prior to commencement of production work in the field, experimental work is carried out and the compliance of the design data with the actual conditions is determined. If necessary, specify the distance between charge 00

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dams ranging from 1.7 to 2.6 the radius of the zone of plastic deformation.

For laying linear charges into the soil, a two-knife stacker is used, mounted on a K-701 tractor and controlled by the tractor's hydraulic system.

A tractor with a stacker is arranged at the excitation point parallel to the seismic survey profile. Using the hydraulic system, the stacker knives are lowered to the ground. The ends of the linear charges are passed through the funnels and pipelines of the stacker knives to 10-15 cm beyond the limits of the pipes. The ends of the charges are equipped with twine lengths of 1.5 m that are attached to wooden pegs fixed on the ground near the knives . They slow down the passage of charges through pipelines and cut the knives into the ground to the design depth. The detonator removes the braking from the charges, sits in the tractor cabin and performs a complete stacking of the charges in the ground. In this sequence, the charges are stacked at the next excitation points. When the tractor with the stacker was removed outside the danger zone, the second detonator connects the detonators to

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Charge charges from opposite sides and at the command of the geophysicist-operator produced - explosion.

Using the method in seismic exploration allows increasing the amount of effective information from target reflecting horizons from 19 to 70% and improving the quality of field material.

Claims (1)

SUMMARY OF THE INVENTION A method for generating seismic waves, comprising placing a continuous linear charge of explosive (BB) in the ground, equipping it with an initiating means and detonating the charge, characterized in that, in order to increase the signal / noise ratio by eliminating direct collision of detonation fronts along the charge axis, at a distance equal to 1.7-2.6 of the radius of the plastic deformation zone of the linear explosive charge, an additional continuous linear explosive charge identical to the main one is placed, while the explosive charges are placed Allelic coplanar ones geotechnical conditions at a depth of 0.7 m or more, an additional explosive charge be equipped with means for initiating from the opposite in relation to the main side and making them simultaneous t undermining.