Submarine cable seismic exploration observation system

An observation system and seismic exploration technology, which is applied in the field of petroleum geophysical exploration, can solve the problems of difficult positioning operation of submarine cable detection points, high cost of submarine cables and related equipment, and improve the efficiency of instrument resources, improve operating efficiency, and high efficiency Effect

Inactive Publication Date: 2014-06-11
BC P INC CHINA NAT PETROLEUM CORP +1
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AI Technical Summary

Problems solved by technology

[0003] Compared with land seismic exploration, in the process of OBC seismic exploration, the cost of investing in submarine cables and related equipment is relatively high. At the same time, the laying and recovery of submarine cables and the positioning of receiver points are difficult.

Method used

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  • Submarine cable seismic exploration observation system
  • Submarine cable seismic exploration observation system
  • Submarine cable seismic exploration observation system

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Embodiment Construction

[0024] 1. Adopt the observation method of the middle excitation line beam observation system with excitation at both ends of the longitudinal direction and reception at one side (see figure 1 ). figure 1 The dotted line represents the receiver point, and the dot represents the shot point. The 8 dotted lines in the upper part and the 16 dotted lines in the lower part of the figure respectively represent the two arrangement lines with a longitudinal gun spacing of 100 meters and 50 meters. When the left shot point is excited, the right side is arranged to receive, and when the right shot point is fired, the left side is arranged to receive. It can be seen from the figure that simply arranging excitation at both ends and receiving at one side will cause repetition of vertical shot points (see figure 1 ), the repetition of the shot points caused the air gun source ship to need two voyages to complete the excitation operation;

[0025] 2. In order to solve the problem of repe...

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Abstract

The invention relates to a submarine cable seismic exploration observation system. According to the submarine cable seismic exploration observation system of the invention, the cost for using an air gun quake source to excite seismic waves is low; reasonable relationships of excitation points and receiving points are designed; a longitudinal middle excitation and bilateral arrangement receiving mode of an original wiring harness-shaped orthogonal observation system is converted into a longitudinal arrangement two-end excitation and unilateral arrangement receiving mode; the excitation points of the air gun quake source are doubled; the positions of the excitation points are not repeated; and excitation points related to a gun line can be completed in one voyage of an air gun quake source boat. Compared with an original observation system, and according to the observation system of the invention, the number of recorded tracks is reduced to 1/2 of an original observation mode with the same amount of workload accomplished, and therefore, and total equipment investment quantity of the original observation mode can be decreased by 1/2, and at the same time, the workload of submarine cable laying and recovery, and wave detection point positioning can be decreased by 33.3%; with the same instrument resource investment, the number of effective excitation gunshots can be doubled, and instrument resource efficiency can be doubled.

Description

technical field [0001] The invention relates to petroleum geophysical prospecting technology, and is a submarine cable seismic prospecting observation system applied to offshore petroleum seismic prospecting. Background technique [0002] Arranging the middle excitation beam observation system is one of the commonly used observation systems for offshore oil seismic exploration with submarine cable (OBC) technology. Seismic exploration using this method generally requires a large number of seismic data receiving channels (geophones). For example, for an observation system with a receiving track spacing of 50 meters and a maximum longitudinal offset of 4975 meters, using the intermediate excitation observation method, a single arrangement requires 2*100 channels. If excitation at both ends of the array is used, only 100 channels for a single array can meet the design requirements, but the workload of shot point excitation is doubled. [0003] Compared with land seismic explo...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/133G01V1/20
Inventor 刘军袁学东张洪军陈浩林王瑞星刘原英
Owner BC P INC CHINA NAT PETROLEUM CORP
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