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Secondary positioning method for submarine cable based on surface fitting

A surface fitting, submarine cable technology, applied in seismic signal processing and other directions, can solve the problem of positioning accuracy and positioning range limited by grids, low calculation efficiency, etc., to achieve stable calculation methods, good statistical effects, and avoid abnormal positioning results. Effect

Active Publication Date: 2012-08-15
BGP OF CHINA NAT GASOLINEEUM CORP
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AI Technical Summary

Problems solved by technology

Various methods have their own characteristics and limitations. Method (1) has low calculation efficiency; method (2) is suitable for detection areas with developed refracted waves and stable refraction layers; method (3) positioning accuracy and positioning range are limited by the network grid limit

Method used

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  • Secondary positioning method for submarine cable based on surface fitting
  • Secondary positioning method for submarine cable based on surface fitting
  • Secondary positioning method for submarine cable based on surface fitting

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Embodiment Construction

[0050] Figure 4 It is the location map of the shot detection point for offshore OBC exploration. The triangle point is the shot point position. Its coordinates are located by the real-time positioning system during the construction process. The rectangle is the theoretical position of the receiver point. There are 167 corresponding shot points for the geophone points of the secondary positioning, that is, corresponding to 167 first arrival times. The steps of the method are as follows:

[0051] 1) During the construction process, the theoretical coordinates of the seabed receiving point and the corresponding coordinates of the excitation point are obtained by the GPS positioning system, and the collected seismic data is obtained by picking up the actual first arrival time;

[0052] 2) Use formula (2) to calculate the theoretical offset l from the receiving point to each excitation point j .

[0053] Where: j is the serial number of the excitation point, j=1-167. Calculated...

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Abstract

The invention relates to a data processing technology of petroleum geophysical prospecting, in particular to a secondary positioning method for a submarine cable based on surface fitting, which comprises the following steps: obtaining a practical first arrival time by using a picking method, calculating the theoretical shot-geophone distance from an acceptance point to each shot point, carrying out surface fitting, calculating the shot-geophone distance by using geophone positions as midpoints to carry out meshing, calculating the theoretical time from a grid node to the shot point, calculating the sum of squares of the difference between the time from a grid node to the shot point and the corresponding first arrival time to serve as the error value of the grid node, composing coordinatesof all the grid nodes and corresponding node error values into a cubic polynomial for space splattering so as to fit a cubic surface, and calculating the point-coordinate position of the minimum value on the surface. Under the premise of improving the positioning accuracy, the calculation efficiency is greatly increased by almost 1.6 times compared with the grid scanning algorithm and by almost 8times compared with the first-arrival circular positioning efficiency.

Description

technical field [0001] The invention relates to a petroleum geophysical prospecting data processing technology, which is a secondary positioning method of a submarine cable by using the first arrival time of seismic waves received by a geophone and its offset to calculate the position of a receiving point. Background technique [0002] With the needs of offshore resource exploration and development, conventional streamer seismic exploration can no longer meet the requirements of offshore oil resource exploration and development. Submarine cable seismic exploration has become an indispensable method for current shallow sea and transitional zone exploration. [0003] Seismic exploration generally designs the position of the shotgun point first, then conducts field measurement according to the designed position, and arranges the positions of the excitation point and the receiving point according to the measured field position. Accurate coordinates of the excitation point and th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28
Inventor 肖永新杨海申雎永平刘丽
Owner BGP OF CHINA NAT GASOLINEEUM CORP
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