Deep-towing multi-channel seismic towing cable attitude determination method and processing terminal

A technique for determining the method and attitude, which is applied to the attitude determination method and processing terminal field of the deep towed multi-channel seismic streamer to achieve the effect of improving accuracy

Active Publication Date: 2021-03-16
GUANGZHOU MARINE GEOLOGICAL SURVEY
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Problems solved by technology

[0006] The second object of the present invention is to provide a processing terminal, which can solve the problem of determining the attitude of the tow cable

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  • Deep-towing multi-channel seismic towing cable attitude determination method and processing terminal
  • Deep-towing multi-channel seismic towing cable attitude determination method and processing terminal
  • Deep-towing multi-channel seismic towing cable attitude determination method and processing terminal

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Embodiment Construction

[0028] Below, the present invention will be further described in conjunction with the accompanying drawings and specific embodiments.

[0029] Such as Figure 2-Figure 5 As shown, a method for determining the attitude of a deep towed multi-channel seismic streamer includes the following steps:

[0030] Step 1: For each shot set, pick out the direct wave travel time t on each geophone d , sea surface reflected wave travel time t ss and sea bottom reflection travel time t sf , where the travel time of the direct wave of the i-th detector is The travel time of the reflected wave from the sea surface is The sea bottom reflected wave travel time is

[0031] Step 2: Obtain the average velocity v of seismic wave propagation in seawater. The average velocity of seismic waves propagating in seawater can be obtained by analyzing the multi-channel seismic data of the sea surface in the area where the actual exploration and acquisition is performed, which is a prior art and will...

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Abstract

The invention relates to a deep-towing multi-channel seismic towing cable attitude determination method and a processing terminal. The method comprises the steps of 1, picking up direct wave travel time, sea surface reflected wave travel time and seabed reflected wave travel time of each detector for each shot gather; 2, obtaining the average propagation speed of seismic waves in seawater; 3, calculating the horizontal distance and the height difference of each detector relative to the seismic source; and 4, solving the three-dimensional coordinates of each detector according to the corresponding equation set to obtain the three-dimensional coordinates of each detector, thereby equivalently obtaining the attitude of the towing cable. According to the method, the three-dimensional spatial form of the towing cable can be obtained without two-dimensional hypothesis. Meanwhile, the relative position between the detector and the seismic source is determined by utilizing the travel time of the direct wave, the seabed reflected wave and the sea surface reflected wave, and the accuracy of the relative position is improved.

Description

technical field [0001] The invention relates to the technical field of determining the attitude of a streamer in ocean exploration, in particular to a method for determining the attitude of a deep towing multi-channel seismic streamer and a processing terminal. Background technique [0002] Deep towing multi-channel seismic is a technology that deploys the seismic source and streamers at a distance of about 100 meters above the seabed for seabed surveys, such as figure 1 as shown, figure 1 The tow body with the seismic source is located above about 100m (meters) from the bottom of the seabed. The tow body is connected to the tow cable. Several geophones are arranged on the tow cable. The tow cable is in an ideal horizontal and straight state. The tow cable passes through the tow body The cables are connected to a seismic vessel located on the surface of the sea. In the conventional sea surface streamer seismic exploration, because there is a thick water layer between the e...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/20G01V1/38
CPCG01V1/201G01V1/3835G01V2210/1423
Inventor 邢涛刘斌文鹏飞温明明
Owner GUANGZHOU MARINE GEOLOGICAL SURVEY
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