SU1265669A1

SU1265669A1 - Source of phase-manipulated seismic signals

Info

Publication number: SU1265669A1
Application number: SU853934867A
Authority: SU
Inventors: Виктор Васильевич Ивашин; Валерий Васильевич Кушнарев; Игорь Александрович Милорадов
Original assignee: Тольяттинский политехнический институт
Priority date: 1985-07-11
Filing date: 1985-07-11
Publication date: 1986-10-23

Abstract

Изобретение относитс к устройствам дл возбуждени сейсмических сигналов на поверхности суши при геофизической разведке. Цель изобретени - повьшение сейсмической эффективности путем увеличени амплитуды силового воздействи . В баке 1 нижj .fyV .. i-Vlvv у-... --: V- i--t- -.-.Ь-Т -- нее основание выполнено из -подвижной и неподвижной частей, причем площадь сечени подвижной части меньше, чем площадь нижнего основани индуктора 4. Подвижна часть нижнего основани жестко соединена с индуктором 4, которьй подвижно сопр жен со стенками корпуса, в результата электромагнитна сила привода, приложенна к индуктору 4, всегда направлена согласно с направлением движени излучающего элемента. Корпус бака 1 вывешен относительно индуктора 4 на упругих элементах 10, установленных между верхними основани ми индуктора и S бака и вьтолненных в виде подвижно (Л сопр женных перевернутых станков, заполненных газом, причем площади сечени подвижной части нижнего основани бака и основани верхнего стакана равны. В результате происходит полна компенсаци изменени внутреннего объема источника вследствие движени излучающего элемента. 1 ил.The invention relates to devices for driving seismic signals on land surface during geophysical prospecting. The purpose of the invention is to increase the seismic efficiency by increasing the amplitude of the force action. In tank 1, the bottom j .fyV .. i-Vlvv y -... -: V- i - t--.- .L-T - its base is made of - movable and fixed parts, and the cross-sectional area of the movable part smaller than the area of the lower base of the inductor 4. The movable part of the lower base is rigidly connected to the inductor 4, which is movably coupled to the walls of the housing, as a result the electromagnetic drive force applied to the inductor 4 is always directed in accordance with the direction of motion of the radiating element. The body of the tank 1 is hung relative to the inductor 4 on elastic elements 10 installed between the upper bases of the inductor and the S tank and made mobile (L conjugated inverted machine tools filled with gas, and the cross-sectional areas of the movable part of the lower base of the tank and the base of the glass are equal. As a result, there is a complete compensation for the change in the internal volume of the source due to the movement of the radiating element. 1 Il.

Description

Изобретение относится к устройствам для возбуждения сейсмических сигналов невзрывиыми способами на поверхности. суши При геофизической разведке и предназначено для реализации фазоманипулированного режима воздействия на грунт, который позволяет уменьшить уровень помех у полученной сейсмической информации и повысить эффективность сейсморазведочных работ.The invention relates to devices for exciting seismic signals in non-explosive ways on the surface. sushi During geophysical exploration it is intended to implement a phase-manipulated mode of impact on the soil, which allows to reduce the level of interference in the received seismic information and increase the efficiency of seismic exploration.

Цель изобретения - повышение эффективности работы источника сейсмических сигналов путем увеличения амплитуды. силового воздействия.The purpose of the invention is to increase the efficiency of the source of seismic signals by increasing the amplitude. force impact.

На чертеже показан предлагаемый источник сейсмических сигналов, разрез .The drawing shows the proposed source of seismic signals, section.

В жестком герметичном баке 1 источника сейсмических сигнайов, заполненном жидкостью 2, расположен электрический двигатель возвратно-поступательного движения с якорем 3, способным, перемещаться вверх и вниз относительно индуктора 4. В пазах индуктора 4 двигателя расположены обмотки 5 и 6 возбуждения. Индуктор жестко соединен с нижним основанием бака через шпильки 7, а бак 1 соединен с индуктором 4 через объемные упругие элементы, состоящие из верхнего 8 и нижнего 9 стаканов, заполненных газом 10. Зазор между индуктором 4 и корпусом бака обеспечивает возможность их относительного перемещения. При необходимости на индукторе 4 и якоре 3. укрепляют уплотнительные элементы, ограничивающие перетоки жидкости вдоль зазоров между якорем 3 и индуктором 4 и между индуктором 4 и корпусом бака. Якорь 3 поддерживается в исходном положении относительно индуктора пружинами 11 и 12. Герметичность бака обеспечивается за счет резиновых мембран 13. Полости 2, индуктор 4, якорь 3, корпус и основания бака 1 представляют собой два мультипликатора. Бак 1 размещен на поверхности грунта..In a rigid sealed tank 1 of the source of seismic signals filled with liquid 2, there is an electric reciprocating motor with an armature 3, capable of moving up and down relative to the inductor 4. In the grooves of the inductor 4 of the motor are the excitation windings 5 and 6. The inductor is rigidly connected to the lower base of the tank through the studs 7, and the tank 1 is connected to the inductor 4 through volumetric elastic elements consisting of the upper 8 and lower 9 glasses filled with gas 10. The gap between the inductor 4 and the tank body allows their relative movement. If necessary, sealing elements limiting the fluid flows along the gaps between the armature 3 and the inductor 4 and between the inductor 4 and the tank body are strengthened on the inductor 4 and the armature 3.. Anchor 3 is maintained in its initial position relative to the inductor by springs 11 and 12. The tightness of the tank is ensured by rubber membranes 13. Cavity 2, inductor 4, anchor 3, the housing and the base of the tank 1 are two multipliers. Tank 1 is placed on the surface of the soil ..

Источник работает следующим образом.The source works as follows.

Под действием веса источника в грунте возникают напряжения сжатия. При подаче импульса тока в обмотку 6 возбуждения двигателя между его якорем 3 и индуктором 4 возникает электромагнитная сила и якорь начинает перемещаться вниз, а индуктор вверх. В заполненной жидкостью полости бака под якорем создается давление P(t), изменяющееся во времени.Under the influence of the weight of the source, compression stresses arise in the soil. When a current pulse is applied to the motor excitation winding 6, an electromagnetic force arises between its armature 3 and inductor 4 and the armature begins to move down and the inductor up. In the liquid-filled cavity of the tank under the anchor, pressure P (t) is created, which varies with time.

Через мультипликатор происходит усиление электромагнитной силы. В результате на нижнее основание индуктора и жестко с ним связанное подвижное нижнее основание бака действует сила f, = (s₂ - s, ) . P(t), где - площадь нижнего основания индуктора;Through the multiplier, the electromagnetic force is amplified. As a result, the force f, = (s ₂ - s,) acts on the lower base of the inductor and the rigidly connected movable lower base of the tank. P (t), where is the area of the lower base of the inductor;

- площадь подвижного основания бака.- area of the movable base of the tank.

Так как площадь нижнего основания индуктора больше площади подвижного основания бака, то сила fj со стороны мультипликатора, приложенная к индуктору и жестко с ним связанному подвижному основанию, направлена вверх. На неподвижную часть нижнего ' основания бака со стороны жидкости действует сила f = S₄ ‘ P(t), . , „ где S _э - площадь неподвижной части нижнего основания. ’Since the area of the lower base of the inductor is larger than the area of the movable base of the tank, the force fj from the multiplier applied to the inductor and the movable base rigidly connected to it is directed upward. The force f = S ₄ 'P (t), acts on the fixed part of the lower' base of the tank from the liquid side. , Where S _e - the area of the fixed part of the lower base. ''

В результате совместного действия ’усилий, развиваемого двигателем между якорем и индуктором и создаваемо3° го гидравлическим мультипликатором, якорь перемещается относительно его исходного положения вниз, индуктор движется вверх, а корпус бака - вниз. Объемный упругий элемент (8,9,10) уменьшает объем верхнего мультипликатора за счет встречного движения стаканов 8 и 9 на величину av = s₄-x, где S₄ - площадь основания стака40 на 8;As a result of the combined action of the efforts developed by the engine between the armature and the inductor and the hydraulic multiplier created by the 3rd °, the armature moves downward relative to its initial position, the inductor moves upward, and the tank body downward. The volumetric elastic element (8,9,10) reduces the volume of the upper multiplier due to the oncoming movement of the glasses 8 and 9 by the value av = s ₄ -x, where S ₄ is the area of the base of the stack 40 by 8;

X - взаимное перемещение стаканов 8 и 9.X - mutual movement of glasses 8 and 9.

Указанное изменение объема при условии, что жидкость 2 абсолютно нес45 жимаема, должно быть равным уменьшению объема бака за счет движения излучающего элемента относительно корпуса бака: дУ, = S,· X.The indicated change in volume, provided that liquid 2 is absolutely incompressible, should be equal to a decrease in the volume of the tank due to the movement of the radiating element relative to the tank body: dU, = S, · X.

Таким образом, необходимо, чтобы площади сечения подвижной части нижнего основания бака и основания верхнего стакана были равны.Thus, it is necessary that the cross-sectional areas of the movable part of the lower base of the tank and the base of the upper glass are equal.

Предварительно нагруженный весом источника.грунт в процессе срабатывания разгружается и поверхностные слои грунта одновременно с баком движутся вверх.Preloaded with the weight of the source, the soil is unloaded during operation and the surface layers of the soil simultaneously move upward with the tank.

После окончания действия развиваемой двигателем силы все элементы системы возвращаются в исходное состояние упругими элементами. Движение грунта при работе двигателя с переме- 5 щением его якоря относительно индуктора вниз сопровождается фазой разгрузки грунта. Соответствующий сейсмический сигнал, начинающийся с фазы разгрузки грунта, можно условно наз- Ю вать отрицательным.After the end of the action of the force developed by the engine, all elements of the system return to their original state by elastic elements. The movement of the soil during the operation of the engine with the displacement of its armature relative to the inductor down is accompanied by a phase of unloading the soil. The corresponding seismic signal starting from the phase of unloading the soil can be conditionally called negative.

Для создания положительного сейсмического сигнала, характеризующегося тем, что при работе электрического двигателя грунт испытывает в пер- 15 воначальный момент дополнительное сжатие, импульс тока подается в обмотку 5 возбуждения. При этом между якорем и индуктором двигателя возникает электромагнитная сила, которая 20 перемещает якорь вверх. В заполненной жидкостью полости бака над якорем создается давление P(t).To create a positive seismic signal, characterized by the fact that when the electric motor is operating, the soil experiences additional compression at the initial moment, a current pulse is supplied to the excitation winding 5. In this case, an electromagnetic force arises between the armature and the motor inductor, which 20 moves the armature up. A pressure P (t) is created in the tank cavity filled with liquid above the anchor.

Через мультипликатор происходит усиление электромагнитной силы. На 25 верхнее основание индуктора, который жестко связан с подвижным основанием бака·, действует сила, направленная вниз:Through the multiplier, the electromagnetic force is amplified. On 25 the upper base of the inductor, which is rigidly connected with the movable base of the tank ·, acts downward force:

= (S_? - S₄ ) . P(t), 30 где S ₅ - площадь верхнего основания индуктора.= (S _? - S ₄ ). P (t), 30 where S ₅ is the area of the upper base of the inductor.

На верхнее основание бака со стороны жидкости действует сила f₄ = (S₆ - S₄). P(t), 35The force f ₄ = (S ₆ - S ₄ ) acts on the upper base of the tank from the liquid side. P (t), 35

S₆ - площадь верхнего основания бака.S ₆ - the area of the upper base of the tank.

В результате совместного действия усилий, развиваемого двигателем между якорем и индуктором и создаваемо- 40 го гидравлическим мультипликатором, якорь и корпус бака перемещаются вверх относительно исходного положения, а индуктор с жестко связанным подвижным основанием бака - вниз.Уве-45 личение объема бака за счет относительного движения подвижного основания бака и его корпуса компенсирует объемный упругий элемент.As a result of the combined action of the efforts developed by the engine between the armature and the inductor and created by the 40th hydraulic multiplier, the armature and the tank body move upward relative to the initial position, and the inductor with the rigidly connected movable base of the tank moves downward. Uve-45 increases the volume of the tank due to the relative the movement of the movable base of the tank and its body is compensated by a volumetric elastic element.

Подвижное основание перемещается 50 вниз, дополнительно сжимает грунт и формирует сейсмический сигнал, который условно можно назвать положительным.The movable base moves 50 downward, additionally compresses the soil and forms a seismic signal, which can conditionally be called positive.

После окончания действия импульсного усилия якорь, индуктор и бак источника упругими элементами возвращаются в исходное положение. При подаче импульсов тока в обмотки 5 и 6 в необходимой последовательности осуществляется требуемая комбинация силовых фазоманипулированных сейсмических сигналов.After the end of the pulse force, the armature, inductor and source tank with elastic elements return to their original position. When applying current pulses to the windings 5 and 6 in the required sequence, the required combination of phase-shifted power seismic signals is carried out.

Предлагаемый источник сейсмических сигналов позволяет создавать большее, чем известный удельное уси- . лие, в результате которого формируется сейсмическая волна. Это обусловлено тем, что на подвижное основание бака (излучающий элемент) помимо гидравлической силы действует электромагнитная сила, которая направлена согласно с направлением движения подвижного основания бака.The proposed source of seismic signals allows you to create more than the known specific gain. the seismic wave. This is due to the fact that in addition to the hydraulic force, an electromagnetic force acts on the moving base of the tank (radiating element), which is directed in accordance with the direction of movement of the moving base of the tank.

Claims

The invention relates to devices for exciting seismic signals by non-explosive methods on the surface, geophysical exploration, and is intended to realize phase-shift manipulation of the soil, which reduces the noise level of the obtained seismic information and improves the efficiency of seismic exploration. The purpose of the invention is to increase the efficiency of the seismic source by increasing the amplitude of the force action. The drawing shows the proposed source of seismic signals, a slit, In a tight sealed tank I of a source of seismic signals filled with liquid 2, there is an electric motor of reciprocating motion with a corona 3 capable of moving up and down relative to inductor 4. In the slots of inductor 4 motor windings are located 5 and 6 waabz wait. The inductor is rigidly connected to the lower base of the tank through the studs 7, and the tank 1 is connected to the inductor 4 via volumetric elastic elements consisting of the upper 8 and lower 9 glasses filled with iO gas. The gap between the inductor 4 and the tank body allows for their relative movement. If necessary, on the inductor 4 and the core of the Z. reinforce sealing elements, limiting the flow of fluid along the gaps between the crust 3 and the inductor 4 and between the inductor 4 and the tank body. Anchor 3 is maintained in its initial position relative to the inductor by springs 11 and 12. The tightness of the tank is ensured by rubber membranes 13. The cavities 2, the armature 4, the measles 3, the body and the bases of the tank 1 are two multipliers. The tank 1 is placed on the ground surface. The source works as follows. Under the influence of the weight of the source in the ground, compressive voltages arise. When a current pulse is applied to the motor excitation winding 6 between its core 3 and inductor 4, an electromagnetic force arises and the measles begin to move downwards and the inductor upwards. In a tank-filled cavity filled with liquid, pressure P (t) is created, which varies with time. Through a multiplier, the electromagnetic force is amplified. As a result, a force f, (Sj - S,), acts on the lower base of the inductor and the rigidly connected movable lower base of the tank. P (t), where S, is the area of the lower base of the inductor; the area of the movable base of the tank. Since the area of the lower base of the inductor is larger than the area of the movable base of the tank, the force f (from the multiplier side applied to the inductor and rigidly connected to it the movable base is directed upwards. A force acts on the stationary part of the lower base of the tank where S is the fixed part of the lower base. As a result of the joint action of the efforts developed by the motor between the core and the inductor and that created by the hydraulic multiplier, the measles move relative to its original polo down, the inductor moves up, and the tank body down. The volumetric elastic element (8,9,10) reduces the volume of the upper multiplier due to the oncoming movement of the glasses 8 and 9 by the value of uV, where is the base area of the glass 8, X is the mutual movement glasses 8 and 9. The volume change indicated, provided that liquid 2 is absolutely desmaxable, should be equal to 1% less tank volume due to the movement of the radiating element relative to the tank body: uV, S, - X. Thus, it is necessary that the cross-sectional area of the movable part of the lower tank bases upper glass base were equal. The pre-loaded weight of the source of the scaffolding in the process of operation is unloaded and the surface layers of the soil simultaneously with the tank move upwards. After the termination of the development of the engine by force, all elements of the system return to their original state with elastic elements. The movement of the soil during the operation of the engine with its core moving relative to the inductor downward is accompanied by a phase of soil unloading. The corresponding seismic signal, starting with the phase of unloading of the soil, can be called negative. To create a positive seismic signal, which is characterized by the fact that when the electric motor is running, the ground experiences additional compression at the initial moment, a current pulse is fed into the excitation winding 5. In this case, an electromagnetic force arises between the core and the inductor of the engine, which moves the measles upwards. A pressure P (t) is created in the tank cavity filled with liquid above the core. An electromagnetic force is amplified through the multiplier. On the upper base of the inductor, which is rigidly connected with the movable base of the tank, a force acts downward: f, (S - S). P (t), where S 5 is the area of the upper base of the inductor. A force 4 acts on the upper base of the tank on the liquid side (Sg - S). P (t), Sg is the area of the upper base of the tank with As a result of the joint efforts of the engine developed between the core and the inductor and the hydraulic multiplier created, the measles and the tank body move upwards relative to the initial position, and the inductor with a rigidly connected movable tank base downwards The increase in the volume of the tank due to the relative movement of the movable base of the tank and its body is compensated for by a volume elastic element. The movable base moves down, additionally compresses the soil and forms a seismic signal, which can be called positive. After the impulse effort has expired, the measles, the inductor and the source tank with elastic elements return to their original position. When current pulses are applied to windings 5 and 6, the required combination of power phase-shift keyed seismic signals is carried out in the required sequence, allowing a greater source of well-known specific amplification, which resulted in the formation of a seismic wave. This is due to the fact that, in addition to the hydraulic force, an electromagnetic force acts on the movable base of the tank (radiating element), which is directed in accordance with the direction of movement of the movable base of the tank. The formula of the image of the shade A source of phase-shifted seismic signals containing an electric motor of reciprocating motion with a core and an inductor, placed in a rigid, tight hermetic tank with upper and lower bases containing a liquid and a housing, movably coupled to the inductor, radiating the slab and a loading mass , characterized in that, in order to increase seismic efficiency by increasing the amplitude of the force action, the lower base is provided with a central it is tightly connected with the radiating plate and ing, with a dick on which the tank is supported through an elastic element formed movably by compressed gas filled with compressed gas, the lower of which is fixed on the inductor, and the upper has a working area equal to the area of the movable part of the lower base, and attached to the upper base of the tank.