SU911402A1

SU911402A1 - Method of generating seismic waves

Info

Publication number: SU911402A1
Application number: SU802943092A
Authority: SU
Inventors: Альфред Александрович Зуев; Николай Павлович Ряшенцев; Иннокентий Сафьянович Чичинин
Original assignee: Институт геологии и геофизики СО АН СССР
Priority date: 1980-06-18
Filing date: 1980-06-18
Publication date: 1982-03-07

Description

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Изобретение относитс к геофизическим методам разведки и может быть использовано, в частности дл целей вибрационного просвечивани Земли,The invention relates to geophysical exploration methods and can be used, in particular, for the purposes of vibrating the transmission of the Earth,

Известен спосо§ возбуждени упругих колебаний путем передачи энергии колеблющегос тела с помощью плиты, контактирующей с одной стороны с грунтом, а с другой - через амортизаторы с инерционной массой {1.The method of elastic oscillation excitation is known by transferring the energy of an oscillating body using a plate that contacts on one side with the ground, and on the other through shock absorbers with an inertial mass {1.

Недостатком сгюсоба вл етс низка мощность излучени дл вибрационного просвечивани Земли, когда необходима энерги излучае№1х волн пор дка Ю Kflw: а амплитуда силы, действующей на грунт, составл ет дес тки килотонн Г23.The disadvantage of a curb is that the radiation power is low for vibrating the transmission of the Earth when the radiation energy of 1x waves is of the order of 10 kflw is necessary: the amplitude of the force acting on the ground is ten kilotons G23.

Наиболее близким к изобретений по технической сущности и достигаемому результату вл етс способ генерировани сейсмических волн дл вибрационного просвечивани Земпи, включающий бурение скважин и размещение источника в массиве горной породыThe closest to the inventions to the technical essence and the achieved result is a method of generating seismic waves for vibratory X-raying of Zempi, including drilling wells and placing a source in a rock massif.

на заданной глубине, например внутри пластов-волноводов. Способ позвол ет значительно повысить интенсивность возбуждаемых волн, что необходимо дл изучени реальных сейсмологических сред С31.at a given depth, for example inside the waveguide formations. The method allows to significantly increase the intensity of the excited waves, which is necessary to study the real seismological C31 environments.

Однако известный способ не может обеспечить мощность источника возбуждаемых колебаний,требуемую дл целей вибропросвечивани Земли.However, the known method cannot provide the power of the source of the excited oscillations required for the purposes of the vibration of the Earth.

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Цель изобретени - повышение энергии излучаемых волнThe purpose of the invention is to increase the energy of the emitted waves.

Claims

The goal is achieved by teM that, according to the method of generating i, 5 seismic waves for vibrating the screening of the Earth, including drilling wells and placing a source of vibrations in a rock mass at a predetermined depth, a saturated permeable formation is used as a source of vibrations. The no. From adjacent strata, and oscillations in the rock, excite by no-f supplying water to it under pressure, cyclically varying in time according to a given law. Fig; 1 shows a possible geological section; in fig. 2 is a plot of pressure exerted on the lower impermeable layer. The geological section has an aquifer 1 with a height S located at a depth L from the day surface 2, and there is a waterproof layer below and above aquifer 1 From the ground surface to the lower waterproof layer 3 drilled (in and lined with pipe 4 with a radius of r which lies along the entire aquifer reservoir 1 has 5 holes. The precipitation pipe is hydraulically connected on one side by pipe 6 to pump 7, and on the other hand by pipe 8 to switch 9. If switch 9 is turned on and turn on pump 7, then in pipe k, and hence ina monolithic layer having certain filtration properties, the pressure H will be established (as a function of the radius Gy) when the switch 9 is rotated with the required frequency, it will open and close the outlet from the pipeline according to a certain law. Approximately the same pressure will change in the aquifer the reservoir and the resultant force The soil lying above a water-bearing stratum of height L can be considered as a mass that serves as an inertial support for a filtering vibration source. The plot of the force acting on the lower impermeable layer 2 has the same appearance as the pressure plot shown in FIG. 2. The use of the invention will allow to increase the amplitude of the resulting force of a single source to tens and hundreds of thousands of tons, and the grouping of 10-15 such sources will allow to achieve the energies required for the deep vibrating sounding of the Earth. Claim Method A method for generating seismic waves for vibrating the transmission of the Earth, including drilling a well and placing an oscillation source in a rock mass at a predetermined depth, characterized in that, in order to increase the energy of the emitted waves, a saturated permeable formation hydroisolated from adjacent strata, and oscillations in a rock are excited by injecting water into the formation under pressure cyclically varying in time according to a given law. Sources of information taken into account during the examination 1. USSR author's certificate number 658016, cl. G 01 V Vli, publ. 1979

2. Collector Problems of the Earth's vibrational transmission through the Earth. M., Science,

3. Authors certificate of the USSR N 506817, cl. G 01 V 1/28, pub. 1976. C / fvS, r-,. -. - i .-.: - g,,