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Method for using time domain transient horizontal electric field down step response to improve resolution capability of electrical layer

A horizontal electric field and step response technology, applied in the field of electromagnetic exploration, can solve the problems of low formation resolution and inability to reflect the characteristics of formation electrical changes, and achieve the effect of overcoming static displacement, overcoming shielding problems, and ensuring signal-to-noise ratio

Active Publication Date: 2016-03-23
中石化石油工程地球物理有限公司
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Problems solved by technology

The early and late apparent resistivities calculated by formula (1) cannot reflect the electrical change characteristics of the formation, and the resolution of the formation is very low

Method used

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  • Method for using time domain transient horizontal electric field down step response to improve resolution capability of electrical layer
  • Method for using time domain transient horizontal electric field down step response to improve resolution capability of electrical layer
  • Method for using time domain transient horizontal electric field down step response to improve resolution capability of electrical layer

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Embodiment Construction

[0045] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0046] Aiming at the insufficient resolution of apparent resistivity in the early and late stages of the transient electromagnetic sounding method and the need for further inversion, the present invention provides a method of improving the resolution of the electrical layer by using the step response under the transient horizontal electric field in the time domain method.

[0047] The embodiment of the present invention is based on the following prerequisites:

[0048] 1) The power supply system emits a current waveform with a duty ratio of 1:1 (such as figure 2 shown);

[0049] 2) Recorded as ...

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Abstract

The invention discloses a method for using time domain transient horizontal electric field down step response to improve a resolution capability of an electrical layer. The method includes the steps of: (1) obtaining horizontal electric field record data of a magnetotelluric field time domain which are collected in field, thereby obtaining two electric field components in a horizontal direction; (2) performing superposition and filtering processing on the electric field components; (3) performing editing processing on up and down step electric field values of the electric filed components, and removing flying spots that deviate obviously; (4) calculating a horizontal electric field in a phi direction; and (5) calculating high-resolution apparent resistivity. The method provided by the invention overcomes the problem of static displacement existing when up step waveform processing is adopted, and greatly eliminates shallow layer interference information irrelevant to the electrical layer. Under the condition that the electrical resistivity of the upper player of electrical layer which is close to the earth surface is relatively small, electromagnetic waves are shielded, but by adoption of the method provided by the invention, electrical layering information with high resolution can still be obtained, thereby enabling an application range of time domain electromagnetism to be expanded.

Description

technical field [0001] The invention belongs to the field of electromagnetic exploration for geological exploration of petroleum, natural gas, unconventional oil and gas reservoirs, and underground mineral exploration, and specifically relates to a method and system for improving electrical layer resolution ability of transient electromagnetic sounding method based on step response under a horizontal electric field. Background technique [0002] The transient electromagnetic sounding method is an electromagnetic prospecting method that uses artificial sources to emit excitation signals and observe the electromagnetic field in the time domain in the study area to study the underground electrical structure. figure 1 It is a schematic diagram of one of the field deployment methods of transient electromagnetic sounding. The physical quantity measured at the observation point is the electric field in two horizontal directions, namely: e x (t) and e y (t) (units are volts / meter)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/38
CPCG01V3/38
Inventor 周芝旭张忠坡姚本全汪卫毛王友胜苏朱刘龚晨程天君
Owner 中石化石油工程地球物理有限公司
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