RU2437123C1 - River seismic exploration system - Google Patents

Abstract

FIELD: physics. ^ SUBSTANCE: disclosed is a river seismic exploration system having a river floating craft made in form of an assembly of rigidly joined river barge and a push-type river cruiser. The front part the hold of the barge, which moves on the ship-way, is fitted with a source of seismic vibrations with impact-mechanical action on the ground, having a mortar launcher, a heavy plunger, a tray with an impact plate, a system of mechanisms for raising and lowering the source. For flexible joining of the source with the bottom of the vehicle, a hatch is made at the bottom, which accommodates the tray with the impact plate which always lies on the outer side of the bottom. The bottom of the barge, in the front part in the region where the source is located, is in form of a ski, and the floating craft is fitted with two branches of rope-winch mechanisms for tying the floating craft to the river bank. ^ EFFECT: high quality of the seismic signal. ^ 2 dwg

Description

The invention relates to the field of non-explosive seismic technology in the search for minerals, in particular for oil and gas.

Known land non-explosive seismic complex according to the patent of the Russian Federation No. 2272302 of 03.20.2006, It includes a land vehicle, in the cabin of which, in the slipway, the source of seismic vibrations of the mortar-plunger type, a system of mechanisms for raising and lowering the source. Here, the source of seismic vibrations is made according to the patent of the Russian Federation No. 2145428 of 02/10/2000. It includes a mortar with a pallet consisting of a pipe, a shock plate and a plunger, while the mortar with the pallet pipe is rigidly fastened.

This source has a shock-mechanical effect on the soil, in which the soil is elastically compressed, visibly crushed and moved together with the shock plate. For movable connection of the source with the bottom of the vehicle, a hatch is made in the bottom, in which the tube of the pallet with the shock plate is placed, while the plate of the pallet is constantly located on the outside of the bottom.

To bring the source into working position, using special mechanisms, it is lowered down to close contact of the slab with the ground, and then pressed to the ground by an effort close to the weight of the vehicle. A seismic signal is generated during a mortar shot. When fired vertically, the source plunger receives a speed of the order of 5-6 m / s and “jumps” to a height of 1.5-2 meters. During the shot, the mortar plate inflicts a shock pulse on the ground equal to the product of the speed of the plunger by its mass. After a jump, the plunger is delayed in its highest position or falls back without delay, creating a second seismic signal with a power equal to the first.

This seismic complex is adopted as a prototype.

The disadvantage of the prototype is the limited scope of its use - only land seismic.

A.1. The aim of the invention is to eliminate this drawback, that is, expanding the field of use of an non-explosive land source of seismic vibrations of the mortar-plunger type according to the patent of the Russian Federation No. 2145428 of 02/10/2000 due to its use for seismic surveys in water conditions of a narrow river coastal strip with a simultaneous increase seismic signal quality. Here, the seismic signal is always generated at the same geophysical level (at the level of the water river surface), which is extremely important in terms of the quality of the seismic signal.

This goal is achieved by the fact that the source of seismic vibrations of the mortar-plunger type with impact mechanical impact on the soil is installed in the hold of a river floating vehicle, which allows seismic surveys in a narrow river coastal strip. As such a floating vehicle, a tandem of rigidly fastened river barges and a push type river boat is adopted, while the bottom of the barge in the front part is made in the form of a ski, and the floating tool, on the right side, is equipped with two branches of cable-winch mechanisms for fastening the floating funds to the river bank.

The scheme of the river seismic complex (floating means with an non-explosive source of seismic vibrations of the mortar-plunger type and shock-mechanical impact on the ground), in the working position, is shown in Figure 1, where 1 is the mortar; 2, 3 - pipe and shock plate of the mortar pan; 4 - a plunger; 5 - bottom of the barge; 6 - a hatch in the bottom; 7 - inner guide tube; 8 - external guide tube; 9 - barge; 10 - the bottom of the barge in the form of a ski; 11 - deck; 12 - soil; 13 - water.

The scheme of fastening a floating vehicle to the river bank is shown in Figure 2, where 14 is a push-type river boat; 15 - barge; 16 - source of seismic signals; 17 - cables; 18 - driven openers.

River seismic complex works as follows.

The sloping section of the coast is selected; a floating vehicle at a certain distance from the coast is installed at a certain angle "Y" to the coast and, along the course of the river, accelerates. The bottom of the barge, made in the front in the form of a ski, runs into the sloping bottom of the river until the floating vehicle stops completely. This position of the floating means is fixed by two branches of cable-winch mechanisms (according to the scheme shown in Figure 2). This completes the process of installing the river seismic complex in the working position. The process of creating seismic vibrations is carried out here similarly with the seismic complex according to the patent of the Russian Federation No. 2145428 of 02/10/2000 (IPC G01V 1/104).

The implementation of the seismic complex in this way allows you to achieve your goal. The proposed seismic complex can conduct seismic exploration in river conditions.

A.2. The aim of the invention is to improve the seismic characteristics of the river seismic complex according to claim 1.

This goal is achieved by the fact that in the river seismic complex according to claim 1, instead of a source with shock-mechanical impact on the soil (according to the patent of the Russian Federation No. 2145428 dated 02.10.2000), a source with shock-sound impact, in which the mortar is equipped with a bottom a heavy hammer, placed in the pipe of the pallet and connected to the pipe movably, using an annular collar on the hammer and a spring mechanism mounted on the inner surface of the pipe. A diagram of such a source is shown in FIG. 3, where 1 is the mortar, 5 is the bottom of the vessel; 19 - heavy drummer; 20, 21 - pipe and plate of the pallet; 22, 23 - upper and lower shelves on the inner surface of the pipe pallet; 24 - collar of the striker: 25 - spring mechanism; 26 - plunger. The source circuit is partially borrowed from RF patent No. 2345386 dated January 27, 2009. Here, between the end face of the striker 19 and the plate 21, a gap of 10-15 cm is constantly maintained for accelerating the striker during the firing of a mortar. The maximum distance from the bottom of the vessel to the pallet plate is limited by the length of the pallet pipe 20 and is about 0.5-0.75 m, and the permissible maximum river depth reaches 1 meter.

Before the shot, the plate 21 with the help of the pallet extends down and with great effort is pressed to the ground. When fired, the plunger moves up, and the mortar with the hammer 19, compressing the spring 25 with a shoulder 24, moves down. When the drummer reaches maximum speed, he hits the plate 21 with the butt end, while the plate remains stationary, and the seismic signal is formed due to its sound vibrations.

The shock-sound effect on the ground is fundamentally different from the shock-mechanical effect and, in some cases, allows to obtain seismic signals cleaner from interference.

River seismic complex, equipped with a source with shock-sound impact on the soil, works as follows. A section of the river is selected with a depth of not more than 1 meter; the floating facility is installed at a certain angle "Y" to the shore; this position of the floating means is fixed by two branches of cable-winch mechanisms (according to the scheme shown in Figure 2). The source plate 21 extends down to contact with the soil of the river bottom and with great effort is pressed to it (according to the scheme presented in figure 3). This completes the process of installing the river seismic complex in the working position.

A seismic complex equipped with a source with shock-sound impact on the soil can also work according to the scheme shown in Fig. 1.

The process of creating seismic vibrations is carried out here similarly with the seismic complex according to the patent of the Russian Federation No. 2145428 of 02/10/2000 (IPC G01V 1/104).

The implementation of the seismic complex in this way allows you to achieve your goal. Equipping the seismic complex with a source with shock-sound exposure to the river bottom soil can significantly improve the quality of the seismic signal.

Claims (1)

A river seismic complex for conducting seismic exploration in a narrow coastal river strip, including a river floating means, a source of seismic vibrations of a mortar-plunger type with mechanical impact on the soil, containing a plunger, mortar and a pallet with a pipe and shock plate, placed by the pallet pipe in the hatch of the bottom of the floating means and a system of mechanisms for raising and lowering the source, characterized in that the floating means is made in the form of a tandem rigidly fastened together a push-type cutters and river barges source of oscillation is placed at the front of the hold of the barge, the barge in the bottom region of the source location is performed in the form of skis, a float means is provided with two side branches Wire-winding mechanisms for fixing floating means to the riverbank.

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