RU14681U1 - SYSTEM FOR MARINE SEISMIC EXPLORATION - Google Patents

Abstract

1. System for marine seismic exploration, including a specialized vessel (SS) equipped with an outboard source of seismic signals (ISS) and installed on board the SS computer system (VC) for collecting and processing geophysical information and connected to the VC receiver of satellite radio navigation (SRNS), as well as connected to the VC by means of a launching and lifting device (SPU) and towed by the SS at least two receiving seismic streamers (PS), to the end of each of which an end buoy (KB) equipped with a radar is fixed to the cable m (RL) reflector, a means of radio communication with the SS and the receiver SRNS, characterized in that the VC additionally includes a module for estimation and forecasting (MOS), the output of which is connected to the control input of the control system, each PS, which is the receiving device of the near zone (BZ), - BZ seismic streamer is additionally equipped with an autonomous receiver of the far zone (DZ) made in the form of a DZ seismic streamer fixed to the end seismic streamer BZ (KBBZ) and placed in the plane of a given geophysical profile at a distance from the ASC defined by the MOS The DZ seismic streamer is equipped with its DZ end buoy (KBDZ), equipped with a radar reflector, an SRNS receiver, and a radio communication channel with VC SS.2. The system according to claim 1, characterized in that the MOS is made in the form of a processor with the ability to calculate the removal of L of each of the n receivers (i = 1, 2, ..., n) of DZ seismic streamers from the ASC in accordance with the expression L = 0.5 [3 · T · t · l · (VV) -l], where: T is the prevailing period of the multiple wave signal; t is the echo time at the point of excitation of the signal; l is the receiver base of the DZ seismic streamer; V and V are the effective velocities, respectively, single and multiple

Description

SHSCHEMA J MOFCKd SELF-DEVELOPING

Siogema O7oyoy7oy to a conservative one, having acquired the means of marine reconnaissance and burned it to be used to study sedimentary sections in the waters of the seas and oceans

HsBecfHEi is much more than 3,4,6-8,12 / yoy marine seismic surveys, which traditionally include a light-emitting vessel (SS) “acquired by an outboard seismic source (OSI) source and computed (computed) seismic receiver (VC) and water system connected to it by the system of redegenin location, as well as associated with the seismic stand and towed receiving seismic streamer (PS). In recent years D2Sh increased informational content of seismic surveying / 1,2 / two (or more) towed seismic streamers, different hay EO sides GQ in iaoskostyah arofiyaey different, and are provided with W / 3.4 / kondevnm buoy (KB) equipped radiogokadionnym (RL) otrazhateyaem IGR radiocommunication means

EB with SS (for example, by means of locomotion performed in

in the form of a satellite receiver of satellite radio navigation - SSh). Moreover, the SS is also equipped with a CFHC receiver,

HQ: O-OIV 1/38

I have F / 4 / lack of noise immunity in multiplying multiples of water. I improved the reliability and reliability of the FH seismic information by either attenuating the receivers and / or learning / 2.6 /, or taking a few measurements / in / / /8/. Such surveys are very time-consuming and expensive / 2 / Vrich, since a given conditional seismic survey from the top of the NIN allows the depth of the dyne cosmos to reach several kilometers (sometimes up to 8-10 km), then reliable the language of such filming is difficult

The well-known system / I / for marine seismic exploration, mistaken for irototide, includes a JI, which is equipped with an OSI onboard and installed on board a СО M of seismic data collection and processing and a GFH € receiver connected to a VC via a demolition device (RAM) ) and towed by CO at least two APs, by the end of each of the KOToptux on the cable cable is fixed an EB equipped with an L reflector, radio communication with the SS and the CPHG receiver.

However, the system / I /, like other analogues / 2-4 / does not provide sufficient noise immunity and a given depth of research, requires additional laborious cycles (profiles) of studying various intervals

section and, as a result, - does not provide the necessary reliability and reliability of measurements, especially with a large length of the EU,

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The main technical solution of the system is to increase the accuracy of the information due to the increase in the accuracy of the tests and the synchronous movement of two substations, located in Ejaskoski one shrozha, and also the newest one for each PS for every use.

Technical results doshmgaehsya as follows.

A system for marine seismic exploration, including SS, equipped with an overhead nose and installed on the BK SS VC for collecting and processing geophysical information and connected to the VC receiver of the SRNS, as well as connected with the VC through the SSG and towed at least two receiver seismococs (ZS), to the SS At the end of each of the cohorns a cable is attached to the chros cable, equipped with a radar detector, a radio communication medium with the SS and an SRNS receiver.

Ohlichihelnogo features of the system are xo, chho VK additionally in the second module of assessment and forecasting (MY), the output of which is connected to the control input of the control system,

each iC, which is a receiving near-base zone (BZ), - oyomokosa BZ is additionally equipped with an advanced receiving near-field bridge (DZ), made in the form

self-mowing land of the DZ, which is a little more proximate to the condoevoy buoy of oisykosa 3 (KBBZ) and located in the pascooot of a given geophysical nrophidia away from the ISS determined by the MOS, each additional half-salt seismic mow of the DZ is equipped with an ovo with an end buoy DZ (KSHZ) with radio channel with VK OS.

In addition, the main feature of the system is that the MOS is made in the form of a conductor with the possibility of calculating the distance LJ of each of the iru receivers (I 1 ,, ...,} DZ seismic streaks from the AIS in accordance with

b, o, .T.-toe, -KY; vrj-e,. ,,,

where T is the predominant period of the multiple waveform; T is the echo time at the point of excitation of the signal; base receiver DZ seismic;

UOZi effective velocities of single and multiple waves, respectively, specified by MOB) and the ability to control, by means of SIU, the removal of DZ seismic streamers from ASC.

Moreover, in the specific case of the MOS, it is possible to control the location of the DZ seismic beam and to remove it from the AIS by the coordinates of the SRIS receivers located on the SS, KBBZ and KShchZ when implementing the differential SRNS method.

The above diagram illustrates the design of the system for marine seismic exploration.

The system contains SS I, ISS 2, VK 3 with a built-in MOS, receiver 4 SRNS, SIU 5, EC BZ 6, PS DZ 7, KBBZ 8, KBDZ 9, means 10, including a PI reflector, receiver SRNS and radio communication device KBDZ 9.

The system works in a way that works.

Vessel I tows in the water surface of SS BZ 6 and SS DZ 7, as well as ISS E. SS VZ 6 provides reception of seismic information in the near zone (BS) and is designed to study the upper structural floor (for details, see / V-PS DS 7 It is towed in the bottom zone (DZ) through SNU 3 and KBBZ 8 and provides seismic sensing of the lower structural floors. VK 3 processes the measurement data of SS BZ 6 and SS DZ 7 with a common base of interference ohms. Built-in VK 3 MOS depending on seismic usuvii of the region research (the estimated power of sedimentary cover and of its speed model, see / 4 / for more details) calculates the removal of each receiver QC ДЗ 7 in accordance with expression (I), which are realized by the operation of SPU 5, providing the necessary conditions for suppressing interference of multiple waves. Measurements are performed when SS I moves along the profile , geodetic reference of SS I, IS VZ 6 and IS DZ 7 is carried out respectively using a 4 CFHC receiver, means 10 installed on KB BZ 8, and means II installed on KB DZ 9. ISS 2 periodically excites elastic vibrations, PS BZ 6 and PS DZ 7 provide registration reflected in The wave, respectively, in the receive and receive receivers, the received information by means of radio communications 10 and II is transmitted to SS I and processed in real time by VK 3, which implements a speed analysis of traditional processing of seismic surveys (the work of such VK is described in detail, for example, in / 9-II /, as well as the assessment and prediction of multiple waves using MOS for the subsequent adjustment of work on the profile

5

in coofsgfOTBJdH with shraki 1).

The operation of the system allows the suppression of multiple warfare within the entire time interval of the regradia corresponding to the jaw section, and the correction of the operation of MY in the process of movement of the SDI increases the accuracy of the information. At the same time, the accuracy of 1C binding and, as a result, the accuracy of seismic studies are increased , is ensured by the re-realization of the di-Ferane dianogogs of the CRYS method with Errors Z-Yum.

Define the values | j; "Which determine the condition

Suppressing interference.

Representing the hodograph equation of the reflected wave in the form of a series and restricting the series to the first two terms, we obtain the kinematic expression of the QO hodograph in the form

At

where X is the removal of explosion-nribor;

V is the effective speed;

Chu - echo time at the point of excitation.

By defining expressions for kinematically corrections of the once (single) reflected and multiple (cr) reflected waves, it is possible (similarly to / V) to determine the kinematic difference

Amendments I1

L-

and after some transformations (L.I. Kogan) get the following expression

 . A

(Woo-h, (p)

where Xj.- removal of the receiving cocoa closest to ISS; V - removal of the far channel;

{, - Л1Л1 к

Substituting in the expression (A1) the condition for suppressing interference in the damping region of the directivity of the interference system: A, where T is the period of the multiple wave signal, we obtain the equation from which we find relation (I) for L; % j From a receiving device with a base from ASC), in which suppression of the aomech is provided.

An example of calculation using formula (I). Initial data:, Т 0.05 s, j в2.8 km, Vo8H km / s, 1 ВЗ, 5 km / s. From expression (I) we get X 4 3.6 km, while d4, 334ms, ATn: 264ms. Then the value of the residual travel time curve is 80ms, i.e. 1,5T.

SOURCE 10 LEVEL tst

I. Having drilled and ayayugi:

1. Franshy's application GBGOZZb, ShSh & 01 V 1/38, .89 / FI Water Iraisaort, 1989, pb |. I2BI77H (ratchet)

2. Visit the RF Ife 07212 and I, IPK 8-01 V 1/38, oyubl, July 16, 1998: ABOUT “ShShO, fe 7, 1998 (aaaler).

3.iai. RF and I766I80, MF & 01 V 1/38, onbd. 03/27/95: OB of the invention, fe 9, 1995 (analogue).

. Seismic exploration. Geophysicist / 1 ed. I.I. Gurvycha, V. 11. Nomokon0va.- M .: Nedra, I98I (anagogue: Gia.Sh. Technical segway reconnaissance surveys, pp. 145-209).

I. Additional state-of-the-art equipment:

5. Application of the Russian Federation Ш 93027029/25, MNS S-OIV 1/38, aiubd .: OB8080 “esh1Ya, K 18, 1995 (06.27.95), p.67.

6.las. RF and 1345843, MNC & 01 V 1/00, opudya. 12/30/94: ABOUT Inventions, IE 47-48, 1994, SL86.

7.Saf. RF te 2093860, ShSh S 01V 1/00, onubya. 20L0.97: ABOUT Inventions, fe 29, 1997, about. 376.

8.Has. RF IE 2IQ73I4, IPC & 01 V 11/00 ,, onubzh: OB Inventions, 8, 1998, about. 475.

9.Eaf. RF and 2I073I2, ShSh O-01 V 1/22, onubya .: © B Isobrechenva, and 8, 1998, about. 474.

10.videteyayetvo RF IE 05265 and I, MF G 01 V 1/22, onubya .: ABOUT the invention, ft 10, 1997, p. 53-54.

11.Application 1F and 93030825/25, MNC & 01 V 1/22, onuby .: ABOUT Energy Cutting, ft 8, 1998, p. II6-II8.

Claims (3)

1. System for marine seismic exploration, including a specialized vessel (SS) equipped with an outboard source of seismic signals (ISS) and installed on board the SS computer system (VC) for collecting and processing geophysical information and connected to the VC receiver of satellite radio navigation (SRNS), as well as connected to the VC by means of a launching and lifting device (SPU) and towed by the SS at least two receiving seismic streamers (PS), to the end of each of which an end buoy (KB) equipped with a radar is fixed to the cable m (RL) reflector, a means of radio communication with the SS and the receiver SRNS, characterized in that the VC further includes a module for estimation and forecasting (MOS), the output of which is connected to the control input of the control system, each PS, which is the receiving device of the near zone (BZ), - the BZ seismic streamer is additionally equipped with an autonomous far-field receiver (DZ), made in the form of a DZ seismic streamer, fixed to the BZ seismic streamer end buoy (KBBZ) and placed in the plane of a given geophysical profile at a distance from the ISS determined by the MOS, each additional The DZ seismic streamer is equipped with its DZ end buoy (KBDZ) equipped with a radar reflector, an SRNS receiver, and a radio channel for communication with the VC SS. 2. The system according to claim 1, characterized in that the MOS is made in the form of a processor with the ability to calculate the removal of L _{i of} each of the n receivers (i = 1, 2, ..., n) of DZ seismic streamers from the ASC in accordance with the expression
L _i = 0.5 [3 · T · t ₀ · l _i ^-1 · (V _cr ^-2 -V _od ^-2 ) -l _i ],
where: T is the prevailing period of the multiple waveform;
t ₀ is the echo time at the point of excitation of the signal;
l _i - the base of the receiver seismic streamers DZ;
V _alone and V _cr - effective speed respectively single and multiple waves MOS asked,
with the ability to control through SPU the removal of DZ seismic streamers from the ASC. 3. The system according to claim 1, characterized in that the MOSFET is configured to control the location of the DZ seismic streamer and to remove it from the AIS by the coordinates of the SRNS receivers located on the SS, KBBZ and KBDZ when implementing the differential SRNS method.