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Method for determining earth vertical electrical anisotropy in marine electromagnetic surveys

一种各向异性、垂直电阻率的技术，应用在用电磁波探测、电/磁的勘探、用于测井记录的电/磁的探测等方向，能够解决没有讨论Hz判断EVTI、没有揭示等问题

Inactive Publication Date: 2008-06-04
EXXONMOBIL UPSTREAM RES CO
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Problems solved by technology

Although CHeesman et al. (Geophysics52, 204-217 (1987)) give the off-line Hz value calculated for the HED seabed source, they do not disclose its use in conjunction with the online seabed Ex, Ey or Ez signal, nor discuss the Hz used to judge EVTI

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  • Method for determining earth vertical electrical anisotropy in marine electromagnetic surveys
  • Method for determining earth vertical electrical anisotropy in marine electromagnetic surveys
  • Method for determining earth vertical electrical anisotropy in marine electromagnetic surveys

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Embodiment Construction

[0020] [0013] The present invention is a method for judging the influence of electrical vertical and lateral anisotropy on controlled source marine electromagnetic survey data. The invention requires measured data for at least one on-line electromagnetic field component and at least one off-line component, the choice of which depends on the type of source. The invention depends upon the realization that some electromagnetic field components are primarily or almost exclusively sensitive to vertical or horizontal resistivity, rather than both, whereas other electric field components are sensitive to both. To take advantage of these facts, the CSEM source needs to generate vertical and horizontal currents. Two types of marine CSEM sources are employed, HED and HMD. The present invention specifies specific electromagnetic field measurement data required for each of these two types of sources.

[0021] 【0014】 HED source For HED sources, it is preferred to obtain data representi...

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Abstract

Oceanographic methods for judging the vertical electrical anisotropy of the Earth use offshore electromagnetic survey measurements (1). The method requires on-line and off-line data and includes at least one electromagnetic field component sensitive at least primarily to vertical resistivity, and another component at least primarily sensitive to horizontal resistivity (4). Using a horizontal electric dipole source, online Ez and offline Hz measurements are preferred. For horizontal magnetic dipole sources, online Hz and offline Ez are preferred. Magnetotelluric data can be replaced by controlled source data that is only sensitive to horizontal resistivity. Maxwell's equations are solved using forward modeling or by inversion using isotropic or anisotropic surface resistivity models.

Description

[0001] [0001] This application claims the benefit of U.S. Provisional Patent Application No. 60 / 688,841, filed June 9, 2005. technical field [0002] [0002] The present invention relates generally to the field of controlled source electromagnetic surveys in offshore environments, wherein controlled electromagnetic transmitters are towed above electromagnetic transmitters on the seabed or positioned between electromagnetic receivers on the seabed for hydrocarbon mining, development, and / or production. Specifically, the present invention is a method for judging the difference between the earth's resistivity measured with a horizontal current and the resistivity measured with a vertical current at a given location. Background technique [0003] [0003] Results of Offshore Controlled Source Electromagnetic ("CSEM") surveys, as disclosed in U.S. Patent No. 6,603,313 to Srnka and U.S. Patent Publication No. 2003 / 0050759 (Srnka et al.) published March 13, 2003 The results obtained ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00G01V3/18
CPCG01V3/12G01V3/083
Inventor L·J·司尔恩卡吕新友O·M·布尔帝兹
Owner EXXONMOBIL UPSTREAM RES CO
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