Wavenumber of the guided wave supported by a thin resistive layer in marine controlled-source electromagnetics

被引：5

作者：

Kong, F. N. ^{[1
]}

Johnstad, S. E. ^{[2
]}

Park, J. ^{[1
]}

机构：

[1] NGI, N-0806 Oslo, Norway

[2] Multifield Geophys ASA, N-5162 Lakesvaag, Norway

来源：

GEOPHYSICAL PROSPECTING | 2010年 / 58卷 / 04期

关键词：

Electromagnetics; Modelling; Reservoir geophysics; STRATIFIED ANISOTROPIC MEDIA; EXPLORATION; DIPOLE; FIELDS; CSEM;

D O I：

10.1111/j.1365-2478.2009.00860.x

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

This paper discusses the asymptotic behaviour of the electromagnetic fields received on the sea-bed (target response), as well as the fields distributed inside a thin resistive target, generated by a horizontal electric dipole above the sea-bed in marine controlled-source electromagnetics for hydrocarbon exploration. It is found that the guided wave supported by a thin resistive target can be expressed as a single-mode exponential function. A simple closed-form expression is derived to relate the single-mode wavenumber of the guided wave to the model parameters: the resistivity and thickness of the target layer, the sea-bed resistivity and the frequency. When the air-wave is removed, the guided wave is dominant among the fields received on the sea-bed at far offset. Hence the wavenumber of the guided wave can be calculated from the fields measured on the sea-bed. The closed-form expression can then be used to invert the target property from the calculated wavenumber and hence, can be considered as a hydrocarbon indicator.

引用

页码：711 / 723

页数：13

共 15 条

[11] ELECTROMAGNETIC FIELDS DUE TO DIPOLE ANTENNAS OVER STRATIFIED ANISOTROPIC MEDIA [J].