High-precision electromagnetic spectrum detection method for ultra-deep oil and gas reservoir

A technology of oil and gas reservoirs and detection methods, which is applied in the direction of electric/magnetic exploration, radio wave measurement systems, measurement devices, etc., can solve problems such as reduced effectiveness of methods, reduced correspondence, and large errors in processing results, and achieves improved solutions The ability to solve geological problems, improve the stability of work, and improve the effect of reliability

Inactive Publication Date: 2019-08-16
周丹 +2
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Problems solved by technology

[0012] In addition, the magnetotelluric wave resistivity measurement method assumes the natural magnetotelluric field signal as a stationary signal during the time-frequency conversion, and performs fast Fourier transform (FFT) according to the stationary signal to obtain the target frequency spectrum data, but the magnetotelluric field signal is a typical non-stationary signal ,

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  • High-precision electromagnetic spectrum detection method for ultra-deep oil and gas reservoir
  • High-precision electromagnetic spectrum detection method for ultra-deep oil and gas reservoir
  • High-precision electromagnetic spectrum detection method for ultra-deep oil and gas reservoir

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[0100] Concrete examples are as follows: the equipment used in the magnetotelluric wave resistivity measurement method can only record two channels, i.e. Ex and Hy, and this record assumes that the underground geological structure is one-dimensional at first (Zxx, Zyy are equal to 0 in (1) formula at this moment) , under this assumption, the impedance value Zxy=Ex / Hy corresponding to different frequencies can be directly calculated by formula (3) (Ex and Hy are measured known quantities). In actual work, the geological structure is non-one-dimensional in most cases. At this time, the results obtained by using scalar observation and calculation methods have large errors, unstable results, and poor repeatability, making it difficult to accurately reflect underground information. That is to say, the existing magnetotelluric wave resistivity measurement technology only needs three steps to obtain the impedance value:

[0101] (1) Field observation of Ex and the Hy time-domain sign...

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Abstract

The invention relates to a high-precision electromagnetic spectrum detection method for an ultra-deep oil and gas reservoir. An ADU-07e comprehensive electromagnetic instrument is connected to four passages simultaneously. The method comprises the following steps: tensor data collection, filtering, AD conversion and data storage; time series editing; quasi-wavelet converter technique time-frequency transformation; tensor impedance and apparent resistivity calculation; frequency depth conversion and deep correction; and result output. The high-precision electromagnetic spectrum detection methodfor the ultra-deep oil and gas reservoir overcomes the defects and deficiencies existing in an electromagnetic wave resistivity measurement method, and data is collected by tensor electromagnetic wave measuring equipment; a processing method is improved, the electromagnetic wave resistivity measurement method is improved and promoted comprehensively, and the hardware working stability, signal resolution ratio, signal-to-noise ratio and the like are improved; a processing technology is added, and an original processing method is improved, so that the reliability degree of the processing resultis improved, and the conditions of error and redundancy abnormity caused by the processing process are reduced.

Description

technical field [0001] The invention relates to a resistivity measurement method, in particular to a high-precision electromagnetic spectrum detection method for ultra-deep oil and gas reservoirs. Background technique [0002] The measurement method of magnetotelluric wave resistivity is a new geophysical detection method developed on the basis of traditional magnetotelluric sounding (MT) combined with drilling, logging and other technologies. [0003] The magnetotelluric wave resistivity measurement method and the magnetotelluric sounding method use the same field source (natural alternating electromagnetic field) and theoretical basis. [0004] The magnetotelluric wave resistivity measurement method overcomes the shortcomings of the magnetotelluric method such as low exploration accuracy, poor layering effect, and low work efficiency by changing the frequency-depth conversion method and using known wells to correct the depth conversion coefficient. In the plain area, the ...

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Application Information

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IPC IPC(8): G01V3/10
CPCG01V3/10
Inventor 周丹于常青朱自串
Owner 周丹
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