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Ocean bottom seismic structure resistivity detection mainly using vertical magnetic field component of naturally changing electromagnetic field of globe

A technology of vertical component and resistivity, which is applied in the field of shallow stratum structure on the seabed, and can solve the problem of expensive containers

Inactive Publication Date: 2009-02-04
フォックスアンソニーシーエル +1
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  • Summary
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Problems solved by technology

[0028] Vessels used in controlled source electromagnetic (CSEM) techniques are relatively expensive (approximately $70,000 per day), and a single marine MT±CSEM measurement point costs approximately $7,000

Method used

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  • Ocean bottom seismic structure resistivity detection mainly using vertical magnetic field component of naturally changing electromagnetic field of globe
  • Ocean bottom seismic structure resistivity detection mainly using vertical magnetic field component of naturally changing electromagnetic field of globe
  • Ocean bottom seismic structure resistivity detection mainly using vertical magnetic field component of naturally changing electromagnetic field of globe

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Embodiment Construction

[0060] According to a first preferred embodiment of the invention, the vertical component Hz of the magnetic field is measured simultaneously at multiple points on the seabed from a natural source (as opposed to an artificial or controlled source) which is appropriate for the structure under study. location. From the physics of the problem it follows that in the absence of noise the magnitude of the vertical component "Hz" of the magnetic field (i.e. the magnitude of the unreferenced sign) is only non-zero at or near the resistivity boundary 50, as Figure 7 The variation in |Hz| (vertical axis) across the resistivity boundary 32 is shown in (from McNeill et al., 1991). Here, "|Hz|" is a mathematical definition representing the amplitude of the vertical magnetic field in Hz. if we imagine in Figure 7 Another such boundary at some distance to the left or right, then the object of interest is a model of the lateral extension of a hydrocarbon-laden, reactive shallow substratum...

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Abstract

The invention measures the vertical component Hz of a magnetic field arising from natural sources (MT) simultaneously at a plurality of points on the sea floor to determine places having a non-zero vertical component Hz indicative of an edge of a resistive body (structure), in order to determine whether or not a sub-bottom geologic structure, known from marine seismic measurements, exhibits a resistivity contrast with the surrounding rocks, a positive contrast being interpreted as indicating hydrocarbon charge within the structure.

Description

technical field [0001] The present invention relates to a method and apparatus for determining properties of seabed and subterranean reservoirs. More particularly, the present invention relates to determining whether a reservoir or, more specifically, a geological structure whose approximate geometry and location is known to seismic techniques, contains hydrocarbons or water, and more particularly, the method and apparatus for Shallow strata of the ocean floor. Background technique [0002] Since 1998, an increasing number of oil companies have begun using electromagnetic (EM) geographic techniques, primarily to determine the resistivity of subsea geological structures (possible hydrocarbon traps) that have been discovered by marine seismic techniques. Seismic techniques can often reveal geological layers and structures in great detail, but seismic techniques cannot reliably distinguish oil from water in traps. [0003] Major multinational oil companies (commonly referred ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/08G01D11/16G01D11/10G01R33/02G01V3/40
CPCG01V3/082
Inventor A·C·L·福克斯O·英格诺
Owner フォックスアンソニーシーエル
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