Electromagnetic sounding method using a transient field spatial derivation on several separations

A space differential and transient field technology, applied in the field of electrical prospecting, can solve problems such as unresolved

Inactive Publication Date: 2008-04-23
电法勘探有限公司俄罗斯联邦
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  • Abstract
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  • Claims
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  • Electromagnetic sounding method using a transient field spatial derivation on several separations
  • Electromagnetic sounding method using a transient field spatial derivation on several separations
  • Electromagnetic sounding method using a transient field spatial derivation on several separations

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Embodiment Construction

[0081] The methods mentioned above, combined with the arguments of this recommended method, were implemented on the basis of the following data.

[0082] parameter P 1 Respond to spatial inhomogeneity (different species) of the field. Because it is necessary to study its changes over time, these changes are described by the following formula:

[0083] P 1 ( t ) = Δ U 1 ( t ) - Δ U 2 ( t ) Δ U 1 ( t ) + Δ ...

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Abstract

The invention relates to electromagnetic prospecting and is used for surface and marine electromagnetic sounding by means of controllable electromagnetic field sources and is applied in a package oil and gas prospecting works for searching and outlining oil and gas fields. The inventive method is based on the selection of a response from earth materials which are secondary modified by hydrocarbons migration. The invention makes it possible to ensure a set of processing technologies enabling to layer-by-layer determine an electrical resistivity and process characteristics of a medium induced polarisation: a polarizability coefficient, a time constant and a relaxation spectrum width. The inventive method consists in carrying out a measurement by several receiving lines, wherein the position of two feeding lines of a sounding plant is substantially symmetrical with respect to the receiving lines which are located within a 30 DEG sector from the feeding line extensions, in recording a transient signal by land axial-dipole sounding devices or by marine sounding devices associated with a continuous signal recording during a ship travel and in calculating the population of interpretable parameters P1, Df, UH, Ps using recorded potential difference curves(U(i) is less than 2, and 2 is more than U(i))which are preliminary processed, contracted in the form of time gates and differentiated.

Description

technical field [0001] The invention belongs to the category of electrical prospecting. This method adopts a controllable electromagnetic field source, which is used in the comprehensive exploration work of exploring and delineating oil and gas deposits according to the secondary change response of rocks under the action of hydrocarbon migration. It can be used for both ground exploration and ocean exploration. Utilizing the invention can ensure that a series of technical methods are used for the layered measurement of the unit resistance and the index measurement of the medium polarization excitation process, such as the polarizability coefficient, time constant, and spectral relaxation width. Background technique [0002] The currently known geoelectric prospecting methods, whether based on artificial electromagnetic fields or natural electromagnetic fields, all measure the layer-by-layer distribution of unit resistance, that is, the resistivity method. These methods can ...

Claims

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Application Information

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IPC IPC(8): G01V3/06
CPCG01V3/083G01V3/12
Inventor P·约耶维治·里杰度M·妙朗维治·文度里宾I·约耶维治·柏士达维夫E·敏智维治·艾健高V·尼古拿维治·艾拿夫Y·艾圣劳维治·达维登高S·艾圣劳维治·艾云劳夫维达·华士耶维治·费勒弟S·加林耶维治·马捷斯E·迪米利维治·利薛仙A·亚卡迪耶维治·柏度夫V·伊度亚度维治·基亚斯柏
Owner 电法勘探有限公司俄罗斯联邦
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