Frequency domain horizontal X-direction magnetic field component observation and data processing method

A technology in the magnetic field component and frequency domain, which is applied in the field of electromagnetic exploration to achieve the effects of reduced engineering costs, stable and reliable data processing, and optimized signal-to-noise ratio.

Inactive Publication Date: 2020-03-27
新疆万盾能源科技有限责任公司
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Problems solved by technology

Point distance between 2m and 100m

Method used

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  • Frequency domain horizontal X-direction magnetic field component observation and data processing method
  • Frequency domain horizontal X-direction magnetic field component observation and data processing method
  • Frequency domain horizontal X-direction magnetic field component observation and data processing method

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specific Embodiment

[0054] The selected exploration area is a fire-flooding oil production area in Xinjiang, the oil reservoir is buried at a depth of 310.5m-328.5m, and the block has been ignited for two years. Borehole logging shows that the formation resistivity of the burned zone is several ten times higher than that of the normal unburned zone, which constitutes the physical property basis for fire-driven state monitoring using the patented method.

[0055] around the ignition well with figure 1 In the way shown, a total of 811 mesh measuring points are arranged, with a point distance ranging from 2m to 5m, to measure the magnetic component in the horizontal X direction, the power supply AB pole dipole distance is 2000m, the sending and receiving distance of the center point of the measurement area is 4000m, the current is 20A, and the frequency range is 1000 Hz to 0.01 Hz, recording time 60 minutes / point.

[0056] The application of this patented technology overcomes the existing conventio...

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Abstract

The invention provides a method for measuring a horizontal X-direction magnetic field component of a frequency domain and simultaneously calculating the apparent resistivity of a whole area. The method comprises the following steps: (1) measuring frequency spectrum data of the horizontal X-direction magnetic field component of the frequency domain in an exploration area in an approximate direction; (2) converting the frequency spectrum data of the horizontal X-direction magnetic field component into an actual measurement normalization function; and (3) finding out a point of which the theoretical normalization function is equal to the actually measured normalization function by adopting a numerical value, and then obtaining the apparent resistivity of the whole area. And resistivity distribution data of the underground specific depth target stratum is obtained through frequency spectrum data processing and inversion. Only horizontal X-direction magnetic field components are collected,instruments are convenient to arrange, the construction efficiency is high, and the engineering cost is low; the capability of distinguishing the geological target in the horizontal direction is enhanced; the technical difficulty of a conventional electromagnetic method under a complex geomorphic condition is solved; the defect that a conventional time domain method is low in long delay signal-to-noise ratio and short in delay signal-to-noise ratio is overcome.

Description

technical field [0001] The invention belongs to the field of electromagnetic prospecting for petroleum, natural gas, unconventional oil and gas reservoirs and other geology and underground mineral deposit exploration, and specifically relates to a frequency domain horizontal X-direction magnetic field component observation and data processing method. Background technique [0002] The surface electromagnetic method is a kind of electromagnetic prospecting method that uses artificial sources to emit excitation signals and observes the primary and induced electric and magnetic fields in the exploration area to study the electrical structure characteristics of underground formations. The existing electromagnetic methods have technical defects such as "space observation blind area" and difficulty in obtaining apparent resistivity. Therefore, a new method such as figure 1 The field measurement layout of the ground horizontal X-direction magnetic field component in the frequency do...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/02G01V3/10
CPCG01R33/02G01V3/10
Inventor 卿召强苏朱刘张雷张斌黄俊民黄党委王静
Owner 新疆万盾能源科技有限责任公司
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