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Electric dipole source three-dimensional time domain finite difference direct interpretation imaging method

A technology of finite difference in time domain and galvanic couple source, which is applied in the field of marine physical electromagnetic exploration, can solve the problems that the excitation source is not well resolved, the marine electromagnetic simulation is not involved, and the frequency of the transmitted signal is uncontrollable, etc.

Inactive Publication Date: 2015-03-11
CHINA NAT OFFSHORE OIL CORP +2
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Problems solved by technology

However, there are deficiencies, (1) it cannot adapt to the undulating terrain of the ground; (2) the addition of excitation sources has not been well resolved, and the frequency of the transmitted signal is not controllable; (3) the simulation of marine electromagnetics is not involved

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  • Electric dipole source three-dimensional time domain finite difference direct interpretation imaging method
  • Electric dipole source three-dimensional time domain finite difference direct interpretation imaging method
  • Electric dipole source three-dimensional time domain finite difference direct interpretation imaging method

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Embodiment

[0136] Example: such as Figure 5 In the conventional marine electromagnetic three-dimensional structural exploration model shown, there are three subdivided spaces: ocean air, seawater, and seabed land, in which the electrical conductivities of ocean air, seawater, and seabed land are 0s / m, 3.7s / m, and 0.333s / m respectively . The depth of the sea is 380m, and there is a prism at a depth of 160m underground, which is 1000m long, 300m wide and 50m high. A transmitter is set in the seawater 50m away from the seabed, and the transmitter sends Gaussian pulse current; Components in each direction, the distance between the transmitter and the receiver is 0m to 2000m, and the pulse response is calculated by using the galvanic couple source three-dimensional time-domain finite difference forward modeling method of the present invention.

[0137] Such as Figure 6 As shown, 20 traces of secondary field time series are plotted and compared in two groups, which are high-resistance ano...

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Abstract

The invention relates to an electric dipole source three-dimensional time domain finite difference direct interpretation imaging method. The method includes the steps of loading Gaussian pulses on an electric dipole source, establishing Maxwell equations and constitutive equations for the ocean air space, the seawater space and the seabed ground space, conducting uniform mesh generation on prism object models of the three spaces, obtaining difference equations of seawater and the seabed ground through a time domain finite difference method according to meshes obtained through mesh generation by consuming that the conductivities and the magnetic conductivities of all the meshes obtained through mesh generation are unchanged, processing the Maxwell equations of ocean air through analysis solutions, calculating the electromagnetic field of the air above the sea surface, processing the boundary conditions of the generation space, setting stabilization conditions, solving the established difference equations through the combination with the processing results of the boundary conditions and the set stability conditions, and obtaining the distribution of the electromagnetic field of the seawater and the seabed ground at any moment.

Description

technical field [0001] The invention relates to a marine physical and electromagnetic prospecting method, in particular to a three-dimensional time-domain finite difference forward imaging method of an electric couple source. Background technique [0002] Whether in the frequency domain or in the time domain, the numerical simulation technology of marine controlled sources mainly includes three major categories: finite difference method, finite element method and integral equation method. Among them, the integral equation method is a very effective calculation method for electromagnetic simulation. The basic idea is to divide the spatial conductivity into two parts, the background conductivity and the abnormal conductivity. The background conductivity is mainly used to solve the Green's function, and the abnormal conductivity is the integral area. conductivity. Compared with other numerical simulation methods, the integral equation method has the biggest advantage that it o...

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Application Information

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IPC IPC(8): G06F17/10
CPCY02A90/10
Inventor 刘春成张双狮张益明王绪本叶云飞张兵牛聪汪小将杨小椿
Owner CHINA NAT OFFSHORE OIL CORP
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