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Method and system for calculating full-time apparent resistivity of time-domain transient horizontal electric field

A technology of apparent resistivity and horizontal electric field, which is applied in the field of electromagnetic exploration and can solve the problems of unclear resistivity reflection.

Active Publication Date: 2015-11-25
中石化石油工程地球物理有限公司
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Problems solved by technology

However, the early apparent resistivity mainly reflects the resistivity of the shallow formation, while the late apparent resistivity only reflects the deep resistivity, and the two cannot clearly reflect the resistivity of the transition period.

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  • Method and system for calculating full-time apparent resistivity of time-domain transient horizontal electric field
  • Method and system for calculating full-time apparent resistivity of time-domain transient horizontal electric field

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Embodiment Construction

[0047] 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.

[0048] In an embodiment of the present invention, the transient electromagnetic sounding method is adopted, such as figure 1 As shown in , it is a schematic diagram of one of the field deployment methods of the transient electromagnetic sounding method. 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), where t is the delay time of observation (unit is second).

[0049] figure 1 Among them, AB is the transmitting electric dipole, a square wave current is fed into the ground through the ...

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Abstract

The invention provides a method and system for calculating the full-time apparent resistivity of a time-domain transient horizontal electric field. The method includes obtaining field acquired time-domain recording data including two electric fields mutually perpendicular to each other and Ry(t), carrying out time-domain filtering, superposing and eliminating flying spots for the time-domain recording data obtained in the previous step, calculating the complete waveforms of upper and low steps, calculating the electric fields of the upper and low steps on phi direction, and calculating the full-time apparent resistivity Pw(t) through the electric field of the upper step.

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 deposit exploration, and in particular relates to a calculation method for full-time segment apparent resistivity of a transient electromagnetic sounding method. 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), where t is the delay time of observation (unit is ...

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Application Information

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IPC IPC(8): G01V3/38
Inventor 周芝旭苏朱刘王友胜汪卫毛姚本全蒋剑平陈孝雄曾梅
Owner 中石化石油工程地球物理有限公司
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