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Shallow sea obstacle zone OBC seismic focus acquisition construction method

A construction method and seismic source technology, which are applied in the field of OBC seismic acquisition seismic source construction in shallow sea obstacle areas, can solve the problems of difficult control of shallow data gaps, and achieve the effect of good seismic acquisition effect.

Active Publication Date: 2014-10-01
BGP OF CHINA NAT GASOLINEEUM CORP
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AI Technical Summary

Problems solved by technology

The implementation of the traditional OBC seismic construction method in the obstacle area mainly adopts special observation system design, such as enlarging small arrays and enlarging shot points at the boundary of the obstacle area. It can make up for the coverage times in the middle and deep layers, but it is difficult to control the data gaps in the shallow layers

Method used

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  • Shallow sea obstacle zone OBC seismic focus acquisition construction method
  • Shallow sea obstacle zone OBC seismic focus acquisition construction method
  • Shallow sea obstacle zone OBC seismic focus acquisition construction method

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Embodiment 1

[0028] Embodiment 1: as figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 , Image 6 , Figure 7 , Figure 8a , Figure 8b as shown,

[0029] There are many drilling and production platforms in the southwest of the BZ project area. These platforms are about 70-150 meters long and 60-90 meters wide. Generally, the platforms are far apart, and two of them are adjacent to each other with a distance of about 300 meters. m; there is an L-shaped trestle bridge in the northwest of the work area. In this project, seismic source construction methods such as vertical and horizontal curved line method and oblique line method have been adopted, and good acquisition results have been achieved. The specific implementation process is as follows:

[0030] (1) Fine reconnaissance, determine the location of obstacles on the construction map, and set aside a safe distance or safe area in advance. And draw obstacles on the design drawings.

[0031] (2) Two methods are adopted fo...

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Abstract

The invention discloses a shallow sea obstacle zone OBC seismic focus acquisition construction method, and belongs to the technical field of OBC seismic acquisition and marine geological survey in the shallow sea with an obstacle. The method comprises the steps that (1) fine scouting is carried out, and the specific position of the obstacle in a work zone is determined; (2) the coordinates of the obstacle are drawn on acquisition design software such as Klseis software or green mountain software; (3) obstacle avoidance and encryption design are carried out according to the obstacle on the acquisition design software; (4) after the obstacle avoidance and encryption design are carried out on the obstacle, the acquisition design and processing software is used for analyzing the shot point deletion and data gap phenomena, and it is determined that the degree of covering, the data gap and the like meet the related technical requirement; (5) construction is carried out according to the obstacle avoidance and encryption design.

Description

technical field [0001] The invention relates to a construction method for an OBC seismic acquisition source in a shallow sea obstacle area, and belongs to the technical fields of shallow sea OBC seismic acquisition and marine geological survey with obstacles. Background technique [0002] The complex surface types and obstacles in the shallow sea have a greater impact on the acquisition of high-precision OBC seismic data. Shallow sea obstacle areas mainly include drilling platforms, single point moorings, artificial islands, bridges, etc. The existence of these large obstacles will cause some alignment lines to fail to lay, and some shot points cannot be excited, resulting in the loss of shallow data. The quality of the data is not good, and the imaging accuracy is also affected. With the improvement of shallow sea exploration and development, the requirements for data quality are getting higher and higher. Obtaining more seismic data in the obstacle area can further improv...

Claims

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Application Information

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IPC IPC(8): G01V1/02
Inventor 董伟梁宝军张洪军李晓东邓波童利清
Owner BGP OF CHINA NAT GASOLINEEUM CORP
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