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Method for identifying subsurface features from marine transient controlled source electromagnetic surveys

A surface, transient technique for identifying subsurface features, processing and displaying data from marine transient electromagnetic surveys

Inactive Publication Date: 2009-08-05
KJT ENTPR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Each measurement is indexed with respect to the moment when the current source is switched on and off

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  • Method for identifying subsurface features from marine transient controlled source electromagnetic surveys
  • Method for identifying subsurface features from marine transient controlled source electromagnetic surveys
  • Method for identifying subsurface features from marine transient controlled source electromagnetic surveys

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Embodiment Construction

[0034] Methods for testing electromagnetic data display and feature recognition by simulating the response of a marine transient electromagnetic survey. refer to figure 1 , the model simulates a survey vessel 10 using dipole electric transmitters (shown as electrodes A and B disposed on the bottom 12A of a body of water 12). For simulation purposes, the electrode spacing was set to 500 m. A current source (not shown separately) was energized so that 100 amps flowed through electrodes A and B. This equates to typical survey practice known in the art using a 100 meter long transmitter dipole and using a current of 500 amps. In either case, the source moment is 5×10 4 amp m. For simulation purposes, the current is simulated as direct current (DC) and cut off when the time index equals zero. It should be understood, however, that switching off DC is only one implementation of a change in current that can be used to induce transient electromagnetic effects. In other embodimen...

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Abstract

A method for identifying features in the Earth's subsurface below a body of water using transient controlled source electromagnetic measurements includes acquiring a plurality of transient controlled source electromagnetic measurements. Each measurement represents a different value of an acquisition parameter. Each measurement is indexed with respect to a time at which an electric measuring current source is switched. The plurality of measurements is processed in a seismic trace display format, in which each trace corresponds to the measurement acquired for a value of the acquisition parameter. A subsurface feature is identified from the processed measurements.

Description

technical field [0001] The present invention relates generally to the field of controlled source marine electromagnetic surveying. More specifically, the present invention relates to methods of processing and displaying data from marine transient electromagnetic surveys so that subsurface features can be identified. Background technique [0002] Marine electromagnetic surveys include "controlled source" surveys. Controlled source surveying includes the steps of: passing an electric current or magnetic field into the seafloor; then measuring the voltage and / or magnetic field induced in electrodes, antennas and / or magnetometers arranged on the seafloor. The voltage and / or magnetic field is induced in response to an electrical current and / or magnetic field traveling through the ocean floor to the Earth's subsurface. [0003] Controlled source surveys, known in the art, typically involve passing alternating current into the seafloor. The alternating current has one or more se...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/10
CPCG01V3/12G01V3/083Y02A90/30
Inventor 库尔特·马丁·斯泰克利昂·A·汤姆森查尔斯·H·施托耶
Owner KJT ENTPR