CN107272067B - A kind of optically-active oil prospecting method - Google Patents
A kind of optically-active oil prospecting method Download PDFInfo
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- CN107272067B CN107272067B CN201710413368.4A CN201710413368A CN107272067B CN 107272067 B CN107272067 B CN 107272067B CN 201710413368 A CN201710413368 A CN 201710413368A CN 107272067 B CN107272067 B CN 107272067B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
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Abstract
The present invention relates to a kind of optically-actives to find oil method, comprising the following steps: S1: providing an observation system, the observation system is made of host, three magnetic probes, four electrodes and GPS antenna；S2: the electromagnetic field data of acquisition time sequence, the sample frequency for observing data is 15Hz, and the continuous observation time is greater than 4 hours, the electromagnetic field data includes five track datas: Ex (t), Ey (t), Hx (t), Hy (t) and Hz (t)；S3: the electromagnetic field observation Ex (t) of time-domain, Ey (t), Hx (t), Hy (t) are converted to electromagnetic field Ex (f), Ey (f), Hx (f), the Hy (f) of frequency domain, by the way of segmentation conversion, the result that multistage is converted is overlapped acquisition average value；S4: electric field intensity azimuth is calculated according to calculation formula θ (f)=(180/3.1415926) arctan [︱ Ey (f) ︱/︱ Ex (f) ︱]；S5: it draws the azimuthal frequency response curve of electric field intensity and explains oiliness.The step of optically-active oil prospecting method provides can direct detection go out the position of oil-gas reservoir, reduce exploration cost.
Description
Technical field
The present invention relates to field of geophysical exploration more particularly to a kind of optically-active to find oil method.
Background technique
In petroleum exploration field, applicable geophysical method has earthquake, gravity, magnetic force and electrical method method, seismic method
Based on the elastic difference of substance, gravity based on density variation, magnetic force based on magnetic contrast, electrical method is then with underground
Based on the resistivity contrasts of medium.These methods are all indirectly to study oil gas field by analysis geologic structure, and can not be straight
Connect the presence for judging oil gas field.The specific method of electrical method method includes a variety of mutation, as induced polarization method, complex resistivity method and when
Frequency electromagnetic method.Induced polarization method, complex resistivity method and time-frequency electromagnetic method are other than capableing of the resistivity of study of rocks, moreover it is possible to grind
Study carefully the polarizability parameter of rock.Polarizability is a parameter for reflecting effect of induced polarization, and the effect mainly reflects troilite,
The not substantive characteristics of oil-gas reservoir.To sum up, up to the present, there are no a kind of methods being capable of direct detection oil-gas reservoir.
Summary of the invention
The purpose of the present invention is being directed to above-mentioned status, a kind of position that can go out oil-gas reservoir with direct detection is provided, is dropped simultaneously
Method is found oil in the optically-active of low exploration cost.
A kind of the technical solution adopted by the present invention: optically-active oil prospecting method, comprising the following steps: S1: providing an observation system,
The observation system is made of host, three magnetic probes, four electrodes and GPS antenna, and four electrodes are for observing two mutually
Vertical electric field component Ex, Ey, three magnetic probes for observing orthogonal three magnetic-field components Hx, Hy, Hz, wherein Ex with
Hx is parallel, and Ey is parallel with Hy；S2: the electromagnetic field data of acquisition time sequence, the sample frequency for observing data is 15Hz, continuous to see
The time is surveyed greater than 4 hours, the electromagnetic field data includes five track datas: Ex (t), Ey (t), Hx (t), Hy (t) and Hz (t),
Wherein E indicates that electric field, H indicate magnetic field, and it is northwards positive direction that x, which indicates North and South direction reference axis, and y indicates east-west direction reference axis,
It is eastwards positive direction, z indicates reference axis vertically downward, and t represents the time；S3: Fast Fourier Transform (FFT) is utilized, to time-domain
Electromagnetic field observation Ex (t), Ey (t), Hx (t), Hy (t) are converted to electromagnetic field Ex (f), Ey (f), Hx (f), the Hy of frequency domain
(f), by the way of segmentation conversion, the result that multistage is converted is overlapped acquisition average value；S4: by frequency domain after being superimposed
Electric field component Ex (f) and Ey (f), according to calculation formula θ (f)=(180/3.1415926) arctan [︱ Ey (f) ︱/︱ Ex
(f) ︱] electric field intensity azimuth is calculated, θ (f) is the azimuth that frequency is f electric field intensity in formula；And S5: with frequency for horizontal seat
Mark, electric field intensity azimuth are ordinate, draw the azimuthal frequency response curve of electric field intensity.
The effect of the technical program is: the step of optically-active oil prospecting method provides can direct detection go out the position of oil-gas reservoir
It sets, reduces exploration cost.
Further, in step S1, the host is V5-2000 electromagnetism measurement apparatus.
Further, in step S2, the continuous observation time is 8 hours.
Further, it in step S3, converts the quantity for the data point chosen every time as N, if sample frequency is Fs, is superimposed it
Ex (f) afterwards is a data sequence, the frequency that i-th of data (i is since 1) indicates are as follows: f=(i-1) * Fs/N；For handing over
It flows for signal, the modulus value of i-th of complex data is exactly the amplitude of signal under the corresponding frequency divided by N/2, and direct current is believed
For number, the modulus value of i-th of complex data is exactly the amplitude of signal under the corresponding frequency, the frequency of the 1st data point divided by N
It is 0, indicates direct current signal, the frequency Fs/N of the 2nd data point, the 3rd frequency 2Fs/N, until N/2 data point.
Detailed description of the invention
Fig. 1 is optical activity schematic diagram, wherein 1 represents Electromagnetic Wave Propagation direction, and 2 represent direction of an electric field, and 3 represent oil reservoir, and 4
Direction of an electric field when without oil reservoir is represented, 5 represent direction of an electric field when having oil reservoir.
Fig. 2 is the observation system of data acquisition.
Electric field rotates angle-frequency curve (1 Hangzhou somewhere when Fig. 3 is no oil reservoir；2 Hebei Nanpi County somewhere).
Fig. 4 is that electric field rotates angle-frequency curve when having oil reservoir.
Specific embodiment
The principle and features of the present invention will be described below with reference to the accompanying drawings, and the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the invention.
Referring to Fig. 1, find oil the schematic diagram of method for a kind of optically-active provided by the invention, i.e. electromagnetic wave after oil reservoir,
The direction of electric field will rotate a certain angle.Wherein 1 is Electromagnetic Wave Propagation direction；2 be direction of an electric field；3 be oil reservoir；4 be oil-free
Direction of an electric field when hiding；5 be direction of an electric field when having oil reservoir.
The optically-active find oil method the following steps are included:
1. the acquisition of time series electric field data
An observation system is provided, referring to Fig. 2, the observation system was by host, three magnetic probes, four electrodes and GPS days
Line composition, four electrodes are mutually perpendicular to for observing two orthogonal electric field component Ex, Ey, three magnetic probes for observing
Three magnetic-field components Hx, Hy, Hz.Ex is parallel with Hx, and Ey is parallel with Hy.Specifically, which is Canadian phoenix earth object
The V5-2000 electromagnetism measurement apparatus of reason company, the electromagnetic field of the V5-2000 electromagnetism measurement apparatus recordable time sequence.
Operate as follows: on 028 measuring point of the L01 survey line in some work area, the sample frequency for observing data is 15Hz, i.e., often
Second records equally spaced 15 data, and the continuous observation time is greater than 4 hours, and three data file L01- can be obtained
028A.TBL, L01-028A.TSH and L01-028A.TSL.L01-028A.TBL is gauge outfit file, has recorded the one of field construction
A little information.L01-028A.TSH is electromagnetic field of high frequency record data, and sample frequency 2400Hz, L01-028A.TSL are low-frequency electricals
Magnetic field data, sample frequency 15Hz.
Electromagnetic field data includes five track datas: Ex (t), Ey (t), and Hx (t), Hy (t), Hz (t), wherein E indicates electric field, H
Indicate magnetic field, it is northwards positive direction that x, which indicates North and South direction reference axis, and it is eastwards positive direction that y, which indicates east-west direction reference axis, z
Indicate reference axis vertically downward, t represents the time.Ex (t) means that the electric field observation in moment t North and South direction, according to this class
It pushes away.
In this present embodiment, the continuous observation time is 8 hours.
2. electric field time-domain is to the conversion of frequency domain
Using Fast Fourier Transform (FFT), the electromagnetic field observation Ex (t) of time-domain, Ey (t), Hx (t), Hy (t) are converted
At the electromagnetic field Ex (f) of frequency domain, Ey (f), Hx (f), Hy (f).By the way of segmentation conversion, the purpose for being segmented conversion is pressure
Random noise processed improves the reliability of data, and the result that multistage is converted is overlapped acquisition average value.Conversion is chosen every time
The quantity of data point be N, if sample frequency is Fs, Ex (f) after being superimposed is also a data sequence, multiple comprising 1024
Number, plural angle indicate phase, the frequency that i-th of data (i is since 1) indicates are as follows: f=(i-1) * Fs/N；I-th of plural number
The modulus value of data is exactly the amplitude (being divided by N for direct current signal) of signal under the corresponding frequency divided by N/2.1st data
The frequency of point is 0, indicates direct current signal, the frequency Fs/N of the 2nd data point, the 3rd frequency 2Fs/N, until N/2 data
Point, data do not have to thereafter.
3. the azimuthal calculating of electric field intensity
By the electric field component Ex (f) and Ey (f) in frequency domain after being superimposed, electric field intensity azimuth is calculated.Its public affairs calculated
Formula is θ (f)=(180/3.1415926) arctan [︱ Ey (f) ︱/︱ Ex (f) ︱], and it is f electric field intensity that θ (f), which is frequency, in formula
Azimuth.Namely with the mould of Ey (f) divided by negating tangent, the azimuth that acquisition is indicated with radian after the mould of Ex (f) again.
4. the interpretation and evaluation of Drawing of Curve and oiliness
Using frequency as abscissa, electric field intensity azimuth is ordinate, and it is bent to draw the azimuthal frequency response of electric field intensity
Line, as shown in Figure 3 and Figure 4.In figure, 8Hz nearby curve to it is recessed be because of Schumann resonance, Schumann resonance is the earth and ionosphere
The inherent characteristic of the resonant cavity of composition.Fig. 3 be Hangzhou somewhere and two, Hebei Nanpi County somewhere observation station electric field rotation angle with
Frequency and the curve graph changed, electric field data are in same time segment record.It can be seen that frequency 1. by 0.5Hz to
7Hz, being basically unchanged of angle of electric field indicate within the scope of the certain depth of underground without petroleum.Electric field when Fig. 4 is Xinjiang oil field
Angle-frequency curve is rotated, from small to large, the angle of electric field tapers to 40 degree by 55 degree to frequency, and variation is due to underground
Petroleum caused by, actually the observation station be above some oil field, it is theoretical to coincide with practical, illustrate that method is found oil in optically-active
Validity.
In this way, optically-active oil prospecting method the step of providing can direct detection go out the position of oil-gas reservoir, reduce exploration at
This.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (4)
1. method is found oil in a kind of optically-active, which comprises the following steps:
S1: providing an observation system, and the observation system is made of host, three magnetic probes, four electrodes and GPS antenna, and four
A electrode is for observing two orthogonal electric field component Ex, Ey, and three magnetic probes are for observing orthogonal three magnetic
Field component Hx, Hy, Hz, wherein Ex is parallel with Hx, and Ey is parallel with Hy；
S2: the electromagnetic field data of acquisition time sequence, the sample frequency for observing data is 15Hz, and the continuous observation time is greater than 4
Hour, the electromagnetic field data includes five track datas: Ex (t), Ey (t), Hx (t), Hy (t) and Hz (t), and wherein E indicates electric field,
H indicates magnetic field, and it is northwards positive direction that x, which indicates North and South direction reference axis, and it is eastwards positive direction that y, which indicates east-west direction reference axis, z
Indicate reference axis vertically downward, t represents the time；
S3: Fast Fourier Transform (FFT) is utilized, the electromagnetic field observation Ex (t) of time-domain, Ey (t), Hx (t), Hy (t) are converted to
Electromagnetic field Ex (f), Ey (f), Hx (f), the Hy (f) of frequency domain are carried out the result of multistage conversion by the way of segmentation conversion
Superposition obtains average value；
S4: by the electric field component Ex (f) and Ey (f) in frequency domain after being superimposed, according to calculation formula θ (f)=(180/
3.1415926) arctan [︱ Ey (f) ︱/︱ Ex (f) ︱] calculates electric field intensity azimuth, and θ (f) is that the electric field that frequency is f is sweared in formula
Measure azimuth；
S5: using frequency as abscissa, electric field intensity azimuth is ordinate, and it is bent to draw the azimuthal frequency response of electric field intensity
Line, the curve contain the information that oil-gas reservoir whether there is.
2. method is found oil in optically-active as described in claim 1, it is characterised in that: in step S1, the host is V5-2000 electromagnetism
Measuring instrument.
3. method is found oil in optically-active as described in claim 1, it is characterised in that: in step S2, the continuous observation time is 8 small
When.
4. method is found oil in optically-active as described in claim 1, it is characterised in that: in step S3, convert the data point chosen every time
Quantity be N, if sample frequency is Fs, the Ex (f) after being superimposed is a data sequence, the frequency that i-th of data indicates are as follows:
F=(i-1) * Fs/N, i is since 1；For AC signal, the modulus value of i-th of complex data is exactly corresponding be somebody's turn to do divided by N/2
The amplitude of signal under frequency, for direct current signal, the modulus value of i-th of complex data is exactly under the corresponding frequency divided by N
Signal amplitude, the frequency of the 1st data point is 0, indicate direct current signal, the frequency Fs/N of the 2nd data point, the 3rd
Frequency 2Fs/N, until N/2 data point.
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