RU37842U1 - SEISMIC DATA COLLECTION AND RECORDING SYSTEM - Google Patents

Description

2003137977

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Seismic Dain Collection and Registration System

The proposed utility model relates to geophysics, and more specifically to field seismic operations, during which seismic vibrations are received by a large number of seismic receivers located on the ground.

The ground-based multichannel system for collecting and recording seismic data is widely known, including seismic receivers, connecting wires, and the seismic station Evolution of terrestrial telemetric systems for recording seismic data. Kuznetsov IM, Instruments and systems for exploration geophysics. The quarterly official publication of the Saratov branch of the Euro-Asian Geophysical Society. No. 2, 2003, p. 7-10.

The pedagogy of this system is its bulkiness and low noise immunity of the wired analog signal transmission system, especially when the number of receiving channels exceeds several hundred.

The closest technical solution is a telemetric system for collecting and recording seismic data, including seismic receivers, connecting wires, seismic data conversion units, telemetry cables and a recording unit containing a control unit for seismic data conversion units. Progress-T2 telemetry recording system, Beskorovayny V.L., Gnatyuk A.I. et al. Instruments and systems for exploration geophysics. The quarterly official publication of the Saratov branch of the Euro-Asian Geophysical Society. No. 2, 2003, p. 11-13.

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blocks, data transmission is carried out, after their substantial compaction, in multiplexed coded mode via telemetric cable, which increases the reliability of seismic data transmission, eliminates external interference and reduces the bulkiness of the cable.

A disadvantage of the known system is the increased complexity of installation and dismantling, due to the need to connect during installation and disconnect when dismantling a large number of connectors, which must be tight and their contacts must not be contaminated to ensure high reliability of electrical connections.

The task is to reduce the complexity of installation and dismantling of the system and increase the reliability of the transmission of seismic data from geophones to the seismic data recording unit.

The problem is solved in that in the known system for collecting and recording seismic data, including seismic receivers, connecting wires, seismic data conversion units, telemetry cables and a seismic data recording unit, comprising a device for controlling seismic data conversion units, according to a utility model, seismic data conversion units and telemetry cables are equipped with radio transceivers, while in the telemetry cables the radio stations are placed according to the scheme, respectively uyuschey allocation scheme converting seismic data blocks on the ground.

The essence of the proposed utility model consists in the fact that the seismic data conversion units and telemetry cables are equipped with radio transceivers, and in the telemetry cables, the radio stations are placed according to the scheme corresponding to the layout of the seismic data conversion units on the ground.

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Since the miniature radio stations are mounted in the cable, the operation of connecting and disconnecting the connectors when it is laid out on the ground is excluded, the operation of connecting the seismic data conversion unit to the cable is also excluded, since the seismic data from the conversion unit to the telemetry cable is transmitted using miniature radio transceivers located at short distances from one another.

The absence of electrical connectors increases the reliability of the transmission of seismic data.

With this arrangement of radio stations in a telemetric cable, it is possible to increase the reliability of radio exchange, reduce energy intensity and the possibility of using miniature radio stations with high throughput for the flow of seismic data.

The proposed system is schematically depicted in the drawing. It includes seismic receivers 1 located on the ground, permanently connected by wires 2 to seismic data conversion units 3, which are equipped with transceiver radios 4, telemetry cables 5, equipped with transceiver radios 6. Telemeter cables 5 are interconnected by cable connectors 7 and connected to a seismic data recording unit 8, comprising a control device 9 of seismic data conversion units, and located on the vehicle 10.

The system operates as follows.

In accordance with the project of seismic exploration in the area according to the given scheme, geophones 1 are permanently connected via wires 2 to seismic data conversion units 3, equipped with transceiver radios 4, and telemetry cables 5, equipped with transceiver radios 6, are laid out according to a scheme corresponding to layout on

dg 5 / h of the terrain of the seismic data conversion blocks 3. Telemetry cables 5 are connected together by cable connectors 7 and connected to the seismic data recording unit 8, equipped with a control device 9 of the seismic data conversion blocks and placed on the vehicle 10. Then, by known methods, by radio exchanges between radios 4 and 6, monitor the condition of the geophones 1, establish by radio exchange using control device 9 the required parameters of the conversion units Seismic data generation 3, after which the seismic data recording unit 8 is put into the data stream standby mode, radio stations 4 into readiness mode for data transmission, and radio stations 6 into receive mode; by known methods, excite seismic vibrations at given points and register the signals received and converted by geophones 1 and conversion blocks 3.

After completion of work on the first site, the system is dismantled, transported and assembled at a new location.

An example is a promising system for performing highly resolving three-dimensional surveys using multiple overlap technology, in which the active part of the seismic data acquisition and recording system includes up to 16 parallel receiving lines located at a distance of 300 m from one another. The active part of each receiving line has a length of 6,000 meters and contains 600 receiving channels (or geophones) located on the line with a step of 10 meters.

In such a system, according to the proposed utility model, 10 seismic receivers, occupying a 100-meter interval of the receiving line, are connected to each conversion unit 3 equipped with a radio station 4. At the same time, on telemetry cables 5, radio stations 6 are placed in increments of 100 meters. Each

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telemetry cable can have a length of up to 1000 meters and contain 10 radio stations.

When performing work using the proposed system, it is necessary to connect 96 segments of telemetric cables, 1000 meters long, containing transceiver-mounted radio stations mounted in cables, and place a seismic data conversion unit equipped with a transceiver-radio station on the ground near each cable radio station, and constantly

connected by wires to geophones, which, as usual, must be placed on the ground.

If in such a project a well-known telemetry system is used, consisting, for example, of 6-channel seismic data conversion units, then during installation it will be necessary to lay out 1,600 seismic data conversion units on the ground, connect 3,200 connectors to connect the conversion units with each other with telemetry cables, perform connection of 1600 connectors connecting seismic receivers with seismic data conversion units. When dismantling, disconnect all 4800 connectors.

The application of the proposed utility model in this case reduces by 50 times the number of connected and disconnected connectors, which increases the reliability of the transmission of seismic data and reduces the complexity of the work.

From the authors: - / / Yu.P. Bevzenko

Claims (1)

A system for collecting and recording seismic data, including seismic receivers, connecting wires, seismic data conversion units, telemetry cables and a seismic data recording unit, comprising a control device for seismic data conversion units, characterized in that the seismic data conversion units and telemetry cables are equipped with radio transceiver , while the telemetry cables of the radio station are placed according to the scheme corresponding to the layout of blocks transform seismic data on the ground.