RU19931U1 - SEISMIC EXPLORATION SYSTEM ON A CURVILINE PROFILE OF AQUATORIA - Google Patents

Description

SEMISMIC EXPLORATION SYSTEM AT THE NEAREST AQUARIUM PROFILE

The system relates to the design of seismic tools and can be used on curved profiles of river water areas and / or in land-sea transit zones.

Numerous devices -73 are known for seismic exploration in water areas, which traditionally include a specially designed vessel equipped with an outboard source of seismic signals (SS) and installed on board the vessel a VG-1 complex for collecting and processing geophysical information and a satellite radio navigation receiver 1c-1i (SRNS), and also connected to the VC by means of a descent-lifting device (SPU), a streamer (SZZh) with geophones installed on it. In this case, as a rule, it is considered that the streamer moves along a straight profile 6, or the position of the streamer is controlled by a passive (uncontrollable) 33 or by controlling the eivMM (taxiing) 53 end buoy of seismic streamers.

The accuracy and quality of seismic exploration in the water area to a large extent depends on taking into account the isolation of the SEC from a given rectilinear profile of 2.73, since the demolition of the GGPK end point with a length of up to 3000 m (11 meters, under the influence of the current)

IPC: (U1U 1/38

can reach 500 m, which leads to the possibility of receiving from the installed profile by 00-400 m.

To account for this substitution in a number of hotels, 3.3.93 magnetic compasses are installed on the SEC, placed evenly in the distance1. iDTIK. The totality of the end buoy, 53 and installed on the DSH-S magnetic compasses allows 3.3.93 hours1G. T1 to accurately take into account the replacement of the braid from a given profile, however, the accuracy of the magnetic compasses (the total error in determining the location of the magnetic compasses can reach 5-40 m 3 ), in some cases, is insufficient for correct geophysical studies, especially on curvilinear profiles of river aquariums.

For geocodes of towed Co, exact location is required, which can be realized 1.3 when placing additional buoys along the length of the streamer and implemented, for example, in system 13, in which the first buoyant buoy SHK and the second buoy located in the middle of the secondary school, equipped with PRNP receivers, determine displacements of the braid according to the differential SRNi method.

System 13 for marine seismic exploration special-purpose vessel equipped with an outboard source SS and installed on board the VC and CFKC receiver connected to the VC, as well as connected to the VC via CSiy and towed behind the vessel at least two S1ZH: to the end of each of which a buoy is mounted on the cable cable, equipped with a radar-cadmium reflector, a means of radio communication with the vessel and the receiver of the SRNS.

nerd proposed design.

However, Oyotema 11 only has one beam located in the middle of the HF buoy, which does not make it necessary to correctly take into account the displacement of the SEC seismic receivers, especially on curvilinear profiles during river seismic acquisition 43. when the characteristic curvature of the profile can be several times less than the length of the SEC (which can reach 1., 5- 3 km}. At the same time, the design of buoys of system 1 is complicated, cumbersome, and cannot adequately correspond to modern seismic technology in the waters of rivers and trawl zones, where the correct differential method C Neither the SEC is sufficient to fix a compact buoyancy of the buoys or floats with vstroennshi them kompaktnmi antennas SRNS,

The essence of the proposed technical solution — that is, the creation of a seismic survey system — on the curved profile of the water area about the possibility of determining the location of all (or most selected) SS reception points (seismic receivers).

The main technical result of the system is to increase the accuracy, reliability and reliability of information by accurately linking the curved profile to the geodetic guards at the implementation of the differential mode of the SRNS. At the same time, an optimal criterion is achieved for the performance of seismic work in the water area accuracy-complexity-cost-efficiency, that is, minimizing the maximum possible accuracy and quality of measurements while minimizing complexity and an acceptable cost of work.

includes a specialized vessel equipped with an outboard seismic source; signals (PS) to a computer complex (VC) installed on board the vessel for collecting and processing geophysical information and a satellite radio navigation receiver (IRN) j connected to the EC as well as connected to the VC by means of a launching and lifting device {CPU} and towed by the vessel a streamer (SEC) with a seismic receiver installed on it and,

CaiK is made with the ability to determine the location of the receiving points of the OS on a curved profile and is equipped with buoyancy fixed to the coolant, on which the SRNS antennas are located, and the SRNS antennas are connected by communication lines with the VC, which is made with the possibility of synchronous processing of received PS information with precise reference of the curvilinear profile to the geodetic coordinates when realizing differential mode

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In the particular case of the LMS implementation, it is made floating, with buoyancy with built-in antennas and SRNS mounted on intersection m ftak SZ or in place; installation of geophones.

In another particular case, the SPK is made at the bottom or with sections stabilized at the same depth, and buoyancy, on which the balanced SRKS antennas are mounted on intersectional couplings of the SPK or at the places of installation of the HiiKOB seismic receiver by means of flexible cables - cables with a length corresponding to the depth of the water area in the places of their attachment .

In this buoyancy, SRNS antennas are located on the hulls, warped on an intersection clutch with an SEC or in the places of installation of seismic receivers on uddechia L from each other 5 different L 1 X Rj where 1 is the pitch length of the geophones, and the values, S53, ... are determined by the requirements the accuracy of binding a curved profile to geodetic coordinates.

To reduce the background of interference that occur during the movement of the SEC due to the uneven course of the vessel and the excitement of the SEC, it is possible to stop it by means of a control at a given depth

The buoyancy of the SPK on the built-in antennas of the SRNS is made in the form of large-sized buoys or floats, and the tail buoyancy attached to the cable to the end of the LF is made in the form of an end pagssive or controllable buoy equipped with a radar reflector, a means of radio communication with the VC of the vessel and the receiver of the SRNS.

VC includes a seismic station for the collection and processing of geophysical information received by the SS and a software module for synchronous geophysical georeferencing reception, in which standard blocks are used, which are part of a computer system or personal computer

In the specific case of the system’s implementation when implementing differential 1. legs of relim, SRNS NAVSTAR and / or GLONASS receivers were used as SRS receivers.

In this case, the system is mainly used on curved profiles of river water areas and / or in land-sea transit zones.

The drawing illustrates an embodiment of the design of a floating ATP system and, in plan, shows a general structural diagram of the system.

The seismic acquisition system includes an optional vessel 1, equipped with a source of OS S and installed on board the BKS and SRNi receiver, i.e. SSH 5, towing the corner of the vessel SPK 6 with the seismic receivers Lv and 7, K Sh. K 6 attached buoyancy 8 with built-in 1I in nickname antennas 9 SRNS. The buoyancy 8 is attached to SPK 6 using cable-strands 10, the system also contains an end buoy 11 with IS equipment located on it (radar reflector, radio link with VC 3 and SRNS receiver). The system is located on a curved profile of the water area (river bed 13).

The system works as follows.

Vessel 1 tows source S SS and SPK 6 seismic line. Receivers 7 ShK 6 provide reception of seismic information. which in parallel with the received antennas 9 SRKS signals arrive through the communication lines to VK 3. VK 3 processes the SS with the help of the seismic station and uses the software module to synchronize the geodetic grabbing of the receiving points (geophones 7) J by implementing the differential SRNS mode comparing the ship receiver 4sec measurements of SRNS signals received by antennas 9). Thus, an accurate (5 -10 m) grafting of the curved profile (nalimer due to the riverbed 13) to geodetic coordinates is carried out

In the clear case, SPK 6 can be made floating., Moreover, buoyancy 8 with integrated antennas 9 SRNS is mounted on intersection couplings of SPK 6 or in the places of installation of geophones 7. In another particular case, SPK 5 can be performed on the bottom or with sections stabilized at the same depth ( see, drawing), moreover, buoyancy 3. on which antennas 9 are placed, mounted on an intersection clutch; ilTH-C 5 or In places where the seismic receiver is installed 7 by cable 10, At that buoyancy S is fixed to С1Ж 6 at distances L from each other equal to L 1 х п, where 1 is the installation step length of geophones 7, p 1,2, 3, .., is determined by the accuracy requirements — the binding of the curved profile 13 to the geodetic coordinates (the characteristic curvature of the profile, for example, with a step length, i.e., 48 - channel braid with a total length of ISuO m and a characteristic curvature of the order of 10? . Moreover, to reduce the background of interference arising from the movement of ilnrK 6 due to the non-uniformity of the ship's progress and waves 1G 6, it is made possible to stop it by means of the SHU 5 at a given depth. In this case, buoyancy 8 with integrated antennas 2u1i 9 is made in the form of small buoys (or floats), and tail buoyancy, fixed to the cable of the cable to the end of school 6, is made in the form of an end passive or controllable buoy li equipped with radiolocation equipment 1 1 reflector, radio communication about VK 3 and the receiver prnp. The VK 3 seismic station and software module are made of standard; blocks that make up a computer system or personal computer. In a particular case, when implementing the differential mode, receivers 4 and 9 are used and NABSTAR SRNS receivers and / or, allowing to obtain a geodetic reference accuracy of 5-10 m. Thus, due to a new design, the system allows accurate and reliable measurements of geophysical information on a curved the profile of the water area by realizing the UPHC docational method, compact striae are located along the entire length of the seismic streamer on m-small bark floating buoys (buoys, floats Bl1 ax). At the same time, the accuracy of positioning the curved profile can be increased by E-4 times compared to the known devices using magnetic compasses .33 or compared to the Cij device with two buoys located along the spit. Improving the accuracy and efficiency of the system & 1 is achieved by lowering the relative depth in comparison with the known device C1 and at an acceptable cost of seismic work in the river areas.

BACKGROUND SOURCES

L Prototype and analogues:

1, PB-BO on W RF N 14681, IPC G01U 1/38, publ. 08/10.SOGO: BIPM, SHO, N 2, p. 607 (prototype).

2. езesl Industry, 1987, v S, N 1, (analogues)

o TTogp Q T-. 1hT -ICOJ.-iO P: X 5 T L / OS; /-.-l. dd-h

. iiciT, nupii8i iljl IN j., ivii-ji. j., uii yJvi;

06/13/90; 13 p. (analogue).

4. Seismic exploration. Handbook of Geophivics / Under. ed. I.I. Gurbich, Nomokonova, Moscow: Nedra, 1981. 464 about. (analogue: G. 413-414).

II. Additional mortgage according to the prior art:

C, -1. -, - TTls f G -). VT L, X JTTT. P / L.CH 7 I .4. (- J y-D. I-.M-BO on iiJV J -i-- N i da..ci., VUL-. 1 / СЫ, ШлУиЛ.

10.06.000, BIPM, 000, N 16, о.510.

6.Pat. RF N 104564, IPC 8010 1/38, publ. 10.0.98: HEY, 1998, N 4, p. 370

7. Algorithm and oiotema for towing seismicos / B.A. Bondarenko et al. - Exploration and protection of mineral resources, 1995,

1995, N 1, p. 37-39.

o i-scjT / w l OH-I.-iQp. ran-in l / o o, -, t-g-1 g A rm oi lg q.-i 1. idsi jrtcb W i j4 L. lidU, aU1G1.-1 uA-ic-i J., .. A . j.J. O4t.

9. Application of France N, MKI QOIU 1/38, publ. 11/11/34.

Claims (9)

1. A seismic exploration system on a curved profile of the water area, characterized in that it includes a specialized vessel equipped with an outboard source of seismic signals (SS) and a computer complex (VC) for collecting and processing geophysical information installed on board the vessel and a satellite radio navigation receiver (SRNS) connected to the VC ), as well as connected to the VC by means of the launching and lifting device (SPU) and towed behind the vessel, the streamer (SPK) with seismic receivers installed on it, made with the ability to determine the location of the reception points of the SS on a curved profile and equipped with buoyancy fixed to the SEC, on which the SRNS antennas are located, and the SRNS antennas are connected by communication lines with the VC, which is configured to synchronously process the information of the received SSs with precise reference of the curvilinear profile to geodetic coordinates when implemented differential mode SRNS.  2. The system according to claim 1, characterized in that the SPK is floating, and buoyancy with built-in antennas SRNS mounted on intersection couplings SPK or in the installation of geophones.  3. The system according to p. 1, characterized in that the SPK is made of the bottom or with sections stabilized at the same depth, and the buoyancy, on which the SRNS antennas are located, are fixed on the intersection couplings of the SPK or in the places of installation of geophones by means of flexible cable cables with a length of corresponding to the depth of the water area in the places of their consolidation.  4. The system according to claims 1-3, characterized in that the buoyancy, on which the SRNS antennas are located, are fixed on intersectional couplings of the SEC or in places of installation of geophones at distances L from each other, equal to L = 1 • n, where l is the length the installation step of the geophones, and the values n = 1,2,3 ... are determined by the accuracy requirements for the curved profile to be linked to geodetic coordinates.  5. The system according to claims 1 to 4, characterized in that the SEC is made with the possibility of stopping it by means of the SPU at a given depth.  6. The system according to claims 1-5, characterized in that the buoyancy of the SEC with integrated SRNS antennas is made in the form of small buoys or floats, and the tail buoyancy attached to the cable to the end of the SEC is made in the form of an end passive or controlled buoy, equipped with a radar reflector, a means of radio communication with the VC of the vessel and the receiver SRNS.  7. The system according to claim 1, characterized in that the VC includes a seismic station for collecting and processing geophysical information of received SSs and a software module for synchronous geodetic reference points of reception points, which are used as standard units that are part of a computer system or personal computer.  8. The system according to claim 1, characterized in that when implementing the differential mode as receivers SRNS used receivers SRNS "NAVSTAR" and / or "GLONASS". 9. The system according to claim 1, characterized in that it is used mainly on curved profiles of river water areas and / or in shallow transit zones of land-sea.