Ocean controllable source electromagnetic response calculating method based on actually-measured launcher morphology data

A technology of a launch device and a calculation method, which is applied in the field of geophysical surveying, can solve problems such as low accuracy, random changes in the shape of the launch source, and reduce calculation accuracy, so as to achieve the effect of improving accuracy

CN106443803AInactive Publication Date: 2017-02-22OCEANOGRAPHIC INSTR RES INST SHANDONG ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2017-02-22
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention belongs to the technical field of geophysical exploration and relates to an ocean controllable source electromagnetic response calculating method. The method is characterized in that a GPS / depth sensor mounted on a launcher is used to measure the position deviation of the launcher and a preset measuring line, substituting the position deviation data into a geological calculation model, allowing an electric dipole to be equivalent to a finite line source and performing subsection calculation, breaking up a sectioned long straight wire of optional morphology into horizontal and vertical equivalent electric dipoles under an observation coordinate system, respectively calculating the electromagnetic response of each section, using an analytic formula to solve an ambient field, using a staggered finite volume method to solve an induction field, and superimposing vector fields to obtain sectioned wires and the ocean controllable source electromagnetic response based on the actually-measured launcher morphology data. The method has the advantages that launcher morphology parameters can be monitored precisely, the method can approach the actual operation working conditions to the maximum extent, and the accuracy of electromagnetic response calculation and inversion can be increased effectively by using a finite line source treatment method.
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Description

technical field

[0001] The invention belongs to the technical field of geophysical survey, and relates to a calculation method for the electromagnetic response of an ocean controllable source. Background technique

[0002] Marine controlled source electromagnetic method is an effective marine geophysical survey method for detecting seabed oil and gas resources and mineral resources. It has played an important role in reducing the risk and ambiguity of deep water oil and gas exploration. It has become a developed country for deep water oil and gas exploration. important means. In offshore oil and gas exploration operations, seismic methods are generally used to find out favorable geological structures of reservoirs, and at the same time, controlled source electromagnetic methods are used to obtain existing high-resistance anomalies. The combination of the two can significantly improve the success rate of exploration.

[0003] The electromagnetic response of the geological mo...

Examples

Embodiment Construction

[0054] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0055] figure 1 It shows the flow chart of the method for calculating the electromagnetic response of the ocean controllable source based on the shape data measured by the launch device provided by the embodiment of the present invention. Such as figure 1 As shown, the calculation method of ocean controllable source electromagnetic response based on the measured shape data of the launcher, the specific process is as follows: use the GPS / depth sensor installed on the electric dipole and its connecting cable to record the track and position of the launcher Coordinates, and calculate the position deviation data of the launch device and the predetermined survey line, and import ...