Construction method for submarine cable seismic acquisition in scallop culture area

Abstract

The invention discloses an earthquake collecting construction method for submarine cables in a scallop breeding area, and belongs to the technical field of earthquake exploration collecting and marine geologic survey in the breeding area of scallops and other marine products. The method comprises the following steps that a long line is tied on an anchor rope of a starting floating ball, a marking floating ball is tied at one end of the long line, the marking floating ball is tied on an anchor, the marking floating ball and the anchor are thrown into the sea, and construction coordinates are recorded; weights, namely bricks, replace the floating balls in sequence and are connected with the long line, and when a centrum ship carries out the excitation operation, a plurality of rubber boats carry out corresponding alerting or marking floating ball dragging operation; the weights, namely the bricks, are fished up along the long line, the floating balls replace the weights, namely the bricks, in sequence, and the scallop floating ball site can be recovered by removing the connected long line; the rubber boats or wooden boats are used for packing up the cables, the floating ball replacing operation is carried out after cable laying, and the floating balls are recovered after centrum implementing and before cable packing up.

Description

technical field [0001] The invention relates to a submarine cable seismic acquisition construction method in a scallop culture area, which belongs to the technical field of seismic exploration acquisition and marine geological survey in a scallop and other seafood culture area. Background technique [0002] Shallow sea (5m-50m) seismic exploration construction environment is very complex, there are many fixed obstacle areas, such as drilling platforms, dams, trestles, artificial islands, etc. Various farming areas with seasonal changes, etc. The existence of these large obstacles will lead to the failure of normal laying of some normally arranged survey lines and the failure of normal excitation of some normal excitation points, which will lead to the loss of shallow seismic data and the inability to obtain the best seismic data. For the fixed obstacle area, the traditional construction method is to construct the excitation point and the receiver point around the obstacle. ...

AI Technical Summary

Problems solved by technology

The scallop culture generally begins to release scallop seedlings from April to May every year, and the entire culture cycle lasts until November of that year. The culture range gradually expands from shallow water to deep water (water depth is less than 20m). Scallop float: a row of about 800m-3000m in the horizontal direction, a pair of floats at an interval of 5m-20m, several rows in the vertical direction, the row interval is about 80m-150m, and the longitudinal distance of the scallop float area is generally 1500m-3000m, so that 1km will be formed 2 -9km 2 In the obstacle area, the scallop float floats on the sea surface, and the float is connected to the anchor pile on the seabed through a certain length of anchor rope. In such an obstacle area, the source point and the receiver point cannot be normally excited and deployed.

If the source ship enters, it will be entangled by anchor ropes and floating balls, causing damage to ship equipment such as air guns. Therefore, usually during construction, either avoid and do not enter the construction, or make compensation for workers and peasants. This leads to the result Whether it is impossible to obtain the best seismic data or greatly increase the cost of exploration, and during the scallop breeding cycle, it is the golden season of OBC seismic acquisition. If only the industrial and agricultural coordination compensation is carried out, the exploration operation will pay a very high price

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