CN102704921B - Measuring device for electrical resistivity of electromagnetic waves while drilling and measuring method thereof - Google Patents

Abstract

The invention discloses a measuring method for electrical resistivity of electromagnetic waves while drilling, comprising the following steps: generating an electromagnetic wave power signal with specific frequency; emitting the electromagnetic wave power signal into a ground layer through an emitting antenna coil; receiving two electromagnetic wave power signals including measured ground layer information through two receiving antenna coils so as to generate two paths of electromagnetic wave power signals including the measured ground layer information; carrying out band-pass filtering to the two paths of the electromagnetic wave power signals including the measured ground layer information, and carrying out AD sampling to the two paths of the electromagnetic wave power signals including the measured ground information which is subjected to the band-pass filtering so as to generate two paths of electromagnetic sampling digital signals; carrying out frequency mixing transformation and low-pass filtering to the electromagnetic wave sampling digital signals so as to generate amplitude value information and phase information; generating amplitude value ratio and phase difference according to the amplitude value information and the phase information; and generating an electrical resistivity drawing board of the electromagnetic wave power sinals in a chart inversion method according to the amplitude value ratio and the phase difference. An embodiment of the invention also discloses a measuring device for the electrical resistivity of the electromagnetic waves while drilling.

Description

A kind of measurement mechanism and measuring method with boring electromagnetic resistivity

Technical field

The present invention relates to oil, Natural Gas Drilling Operation measurement while drilling or well logging during field, especially in geologic steering drilling system a kind of based on high frequency owe sampling algorithm with boring electromagnetic resistivity measuring method and device.

Background technology

Electromagnetic resistivity is the important geologic parameter that is used for carrying out real-time formation evaluation in geologic steering drilling system, drilling guidance information is provided.Electromagnetic resistivity drilling measuring technology is to grow up on the basis of traditional cable electromagnetic resistivity measuring technique, is a kind ofly can in drilling process, measure the boring measuring method of different azimuth formation resistivity around in real time.Well logging during is the advanced logging technique developing rapidly recent years, compare with conventional logging method, measurement while drilling downhole data can be more in time, truer and precision is higher, more objectively react the true geologic feature on stratum, met the special requirement of contemporary industrial gas oil to logging technique index.Along with the development of whole petroleum industry, the drilling technologies such as high angle hole, horizontal well are used to the oil reservoir that exploitation scale is less, physical property is poorer, oil reservoir is thinner, non-homogeneity is strong more and more.Well logging during (LWD) is due to self advantage and feature, is used to more in the geologic steering drilling application work of the evaluation of these oil reservoirs and high angle hole, horizontal well.Wherein, the electromagnetic wave resistivity logging in well logging during is a kind of in electrical log, in oil detection and drilling technology, has critical role.Because electromagnetic wave produces amplitude fading and phase shift when passing through medium, and because the resistivity on stratum and the characteristic of dielectric constant determine, the amplitude fading that electromagnetic wave produces when passing through Different Strata medium is different with phase deviation.Because electromagnetic frequency characteristic is different, when frequency is higher, electromagnetic wave amplitude fading and phase deviation are main relevant to the dielectric constant on stratum, and when wave frequency is during lower than 10MHZ, electromagnetic wave amplitude fading is mainly relevant to the resistivity on stratum with phase deviation.Resistivity is important geologic parameter for geologic steering drilling and oil field stratum evaluation formation resistivity.Method for measured resistivity is also a lot, and electromagnetic wave measurement mode can be applied in poorly conductive or nonconducting drilling fluid, and this is that the metering system institutes such as current resistor rate are irrealizable.

At United States Patent (USP) (No.6218842), announced a kind of electromagnetic resistivity well logging during instrument, it comprises that can be crossed the asymmetric emitter design producing individual frequency electromagnetic wave signal, the a pair of reception antenna group that is positioned in transmitting antenna array end, at emission array and reception antenna group, it is the wellbore formation that will measure, a calibration transmitting antenna is installed between two reception antennas, and it is used as two kinds of different mode of operations.In the first mode of operation, it is used to calibrate receiving antenna device thermal drift, and under this mode of operation, the decay of measurement and the parameter of phase shift, be used to the thermal drift that calibration instrument occurs when borehole survey stratum.Therefore before each measurement is carried out, it can carry out the correction of temperature drift.During the second mode of operation, calibrate receiving system and can be used to the measurement of the electromagnetic resistivity on drilled stratum.But the shortcoming of this method is to eliminate the interference outside temperature drift effects, as noise in circuit etc.

In the patent of invention (NO.CN101482013) of authorizing in China, a kind of mt ripple method of measuring resistivity and instrument thereof are disclosed, instrument comprises the electric-field sensor of reception electric field intensity signal, receive the magnetic field sensor of magnetic field intensity signal, two preposition amplifications that are connected with the output of electric-field sensor and magnetic field sensor are respectively stored and treatment system with wave filter, the data collecting system being connected with the output of wave filter with preposition amplification and collection control, data.But the shortcoming of this method is to reduce sample frequency, and measures needed formation parameter in the situation that of low sample frequency.

In above-mentioned various prior aries, be all the impact that utilizes frequency electromagnetic waves can be subject to resistivity when by stratum produce amplitude decay and and the skew of phase place, the attenuation ratio of apparatus measures electromagnetic wave amplitude and electromagnetic phase difference, the mode that adopts hardware circuit to measure for some technology, but because circuit inner noise disturbs, can affect reliability and the precision of measuring circuit, and the analog device in hardware circuit is more serious with temperature drift meeting.Some adopts over-sampling mode to measure amplitude fading ratio and the phase difference value of electromagnetic wave signal, but because the frequency of electromagnetic wave signal itself is higher, over-sampling requires the sample rate higher than electromagnetic wave signal, high temperature, high accuracy and AD device at a high speed almost do not have like this, and the high AD device of the high sampling precision of sample frequency can produce a large amount of sampled datas, this requirement to digital signal processor computing capability is higher, because whole circuit working is at high frequency state, can make the power consumption of system roll up.

Summary of the invention

In order to overcome the defect existing in prior art, the object of the invention is to propose a kind of with boring electromagnetic resistivity measuring method, comprising: the electromagnetic wave power signal that produces CF; By transmitting antenna coil, described electromagnetic wave power signal is transmitted in stratum; By two receiving antenna coils, receive respectively the electromagnetic wave power signal that contains tested formation information, generate the electromagnetic wave power signal that two-way contains tested formation information; The electromagnetic wave power signal that described two-way is contained to tested formation information carries out respectively bandpass filtering, and the electromagnetic wave power signal that the two-way after bandpass filtering is contained to tested formation information generates two-way electromagnetic wave sampled digital signal after sampling by AD; Each road electromagnetic wave sampled digital signal to described two-way electromagnetic wave sampled signal carries out mixing conversion and LPF, generates amplitude information and the phase information of each road electromagnetic wave sampled digital signal; According to amplitude information and the phase information of described two-way electromagnetic wave sampled digital signal, generate amplitude ratio and the phase difference of described two-way electromagnetic wave sampled digital signal; According to described amplitude ratio and phase difference, according to chart, inverting generates the resistivity chart board of described electromagnetic wave power signal.

In order to overcome the defect existing in prior art, the present invention also aims to propose a kind of with boring electromagnetic wave resistivity survey apparatus, comprising: electromagnetic wave power signal generation device, for generation of the electromagnetic wave power signal of CF; Transmitting antenna coil, for being transmitted into stratum by the described electromagnetic wave power signal producing; Two receiving antenna coils, for receiving the electromagnetic wave power signal that contains tested formation information, generate the electromagnetic wave power signal that two-way contains tested formation information; Electromagnetic wave sampled signal generating apparatus, for electromagnetic wave power signal that described two-way is contained to tested formation information, carry out respectively bandpass filtering, and the electromagnetic wave power signal that the two-way after bandpass filtering is contained to tested formation information generates two-way electromagnetic wave sampled digital signal after sampling by AD; Amplitude information and phase information generating apparatus, carry out mixing conversion and LPF for each the road electromagnetic wave sampled digital signal to described two-way electromagnetic wave sampled signal, generates amplitude information and the phase information of each road electromagnetic wave sampled digital signal; Amplitude ratio and phase difference generating apparatus, for according to amplitude information and the phase information of described two-way electromagnetic wave sampled digital signal, generate amplitude ratio and the phase difference of described two-way electromagnetic wave sampled digital signal; Resistivity chart board generating apparatus, for comparing and phase difference according to described amplitude, according to chart, inverting generates the resistivity chart board of described electromagnetic wave power signal.

The embodiment of the present invention this based on high frequency owe sampling algorithm with boring electromagnetic resistivity measuring method and measurement mechanism, hardware circuit is simple, analog device is few, and temperature on the impact of device a little less than.The present invention can be by lower sample rate concerning electromagnetic wave signal sample (this be because be a pair of conflicting technical data index for high sampling rate high temperature AD device and high accuracy), can select so the lower but high temperature AD device that sampling precision is high of sample frequency, electromagnetic wave signal is sampled, can improve the precision of measuring system, reduce the power attenuation that whole system operating frequency reduces whole system.

Accompanying drawing explanation

In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those skilled in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.

Fig. 1 is a kind of method flow diagram with boring an embodiment of electromagnetic resistivity measuring method of the present invention;

Fig. 2 is the method flow diagram of the electromagnetic wave power signals step of the generation CF in embodiment illustrated in fig. 1;

Fig. 3 is that the electromagnetic wave power signal that the two-way to described in embodiment illustrated in fig. 1 contains tested formation information carries out respectively bandpass filtering, and after sampling by AD, generates the method flow diagram of the step of two-way electromagnetic wave sampled digital signal;

Fig. 4 carries out mixing conversion and LPF to described two-way electromagnetic wave sampled signal in embodiment illustrated in fig. 1, generates the method flow diagram of the step of amplitude information and phase information;

Fig. 5 is a kind of structural representation with boring an embodiment of electromagnetic wave resistivity survey apparatus of the present invention;

Fig. 6 be the embodiment of the present invention with the transmitting antenna coil and the structural representation of receiving antenna coil in non magnetic drill collar that bore in electromagnetic wave resistivity survey apparatus;

Fig. 7 is the structural representation with the electromagnetic wave power signal generation device in brill electromagnetic wave resistivity survey apparatus of the embodiment of the present invention;

Fig. 8 is the structural representation with the electromagnetic wave sampled signal generating apparatus in brill electromagnetic wave resistivity survey apparatus of the embodiment of the present invention;

Fig. 9 be the embodiment of the present invention with boring amplitude information in electromagnetic wave resistivity survey apparatus and the structural representation of phase information generating apparatus;

Figure 10 is the amplitude information of the embodiment of the present invention and the theory diagram that phase information generating apparatus carries out algorithm process process;

Figure 11 be utilize the embodiment of the present invention with boring electromagnetic wave resistivity survey apparatus and measuring method, carry out the design sketch after algorithm process.

The specific embodiment

Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.

Because the present invention has used, owe Sampling techniques high frequency electromagnetic wave signal is sampled, therefore need eliminate through the algorithm of response the frequency aliasing of owing sampling.Its principle is as follows:

The sample rate of the electromagnetic wave signal sampling of traditional employing nyquist sampling theorem need to be higher than the frequency of the electromagnetic wave signal being sampled, be nyquist sampling law: be provided with a frequency band limited signal x (t), its frequency band limits is (0, fH) in, if x (t) is carried out to equal interval sampling to be not less than the sampling rate of fs=2fH, obtain time-discrete sampled signal x (n)=x (nTs) (wherein Ts=1/fs is called the sampling interval), original signal x (t) will fully be determined by resulting sampled value x (n).

This theorem explanation: if band-limited signal is sampled to be not less than the sample rate of signal highest frequency twice, so resulting discrete signal samples value just can be determined original signal exactly.The electromagnetic wave signal being sampled can not produce aliasing on frequency domain.

But because the electromagnetic wave signal highest frequency being sampled is 2MHZ, using traditional nyquist sampling theorem to sample so just need to be higher than the sample frequency of 2 times, high like this sample frequency high-precision and be that the AD converter of high temperature does not have in existing device, can only adopt the digital signal processing algorithm of owing sample mode and response to process, determine accurately the electromagnetic wave signal before being sampled.

Because the electromagnetic wave signal being sampled is bandpass signal, itself bandwidth might not be very wide, therefore likely uses than the lower speed of sample rate of the Nyquist theorem defined electromagnetic wave signal of sampling.For a logical very narrow electromagnetic wave signal of band, establish the frequency band magnetostatic wave signal x (t) that rations the power supply, its frequency band limits is in (fL, fH), if its sampling rate fs meets:

$f_s=\frac{2(f_L+f_H)}{2n+1}---(2-1)$

In formula, n gets and can meet f _s>=2 (f _h-f _l) maximum positive integer, with fs, carry out the resulting signal sampling value of equal interval sampling and can accurately determine former electromagnetic wave signal x (t).

Or: $\frac{2f_H}{n+1}\≤f_s\≤\frac{2f_L}{n},$ N is the integer part of value.

Formula (2-1) also can be expressed as with centre frequency f0 and the frequency bandwidth B of bandpass signal:

$f_s=\frac{4f_0}{2n+1}---(2-2)$

In formula, f0=(fH+fL)/2, n gets and can meet f _s>=2B(B=fH-fL) maximum integer.

Obviously, when f0=fH/2, B=fH, get n=0, formula (2-2) is exactly Nyquist sampling thheorem, meets: fs=2fH.From formula (2-2), when frequency bandwidth B mono-timing, in order to be that twice frequency bandwidth speed (fs=2B) is sampled to bandpass signal by minimum sampling rate, the centre frequency of bandpass signal must meet:

or f _l+ f _h=(2n+1) B (2-3)

The highest (or minimum) frequency that is signal is the integral multiple of bandwidth.That is to say that any one centre frequency is f0n(n=0,1,2,3, ...) bandwidth is B band energising magnetostatic wave signal all can be sampled to signal with same sample frequency fs=2B, these samplings all can represent to be positioned at the primary signal x0 (t) of different frequency range, x1 (t) exactly, x2 (t) ...

The above-mentioned band energising magnetostatic wave signal applicable precondition of sampling is: only allow on a frequency band, to have signal therein, and do not allow to exist signal simultaneously on different frequency bands, otherwise will cause signal aliasing.This can adopt the way that adds a narrow band filter before sampling to solve.

For high frequency electromagnetic wave signal, owing the process of sampling can process as following example: one can be expressed as through the filtered arrowband of narrow band filter electromagnetic wave signal:

x(t)=a(t)·cos[ω ₀t+θ(t)] （2-5）

Arrowband electromagnetic wave signal should meet:

$\frac{{\mathrm{\ω}}_0}{2\mathrm{\π}}>>B$

B is arrowband electromagnetic wave signal bandwidth.Can prove that at this moment the Hilbert of x (t) is transformed to:

H[x(t)]=a(t)·sin[ω ₀t+θ(t)] （2-6）

So the analytic representation of narrow band signal is:

z(t)=a(t)·cos[ω ₀t+θ(t)]+ja(t)·sin[ω ₀t+θ(t)] （2-7）

Or be expressed as by polar form:

$z\left(t\right)=a\left(t\right)\·e^{j[{\mathrm{\ω}}_{0}t+\mathrm{\θ}\left(t\right)]}---(2-8)$

From above formula, can be clear that, the instantaneous amplitude that a (t) is signal, for the instantaneous phase of signal, and instantaneous angular frequency for signal.These three full details that characteristic quantity has comprised narrow band signal.

Above formula can be rewritten as again:

$z\left(t\right)=a\left(t\right)\·e^{\mathrm{j\θ}\left(t\right)}\·e^{j{\mathrm{\ω}}_{0}t}---(2-9)$

In formula for the carrier component of signal, as information carrier, do not comprise useful information.Above formula is multiplied by carrier frequency is moved down to ω ₀, become zero intermediate frequency signals, i.e. baseband signal.

z(t)=a(t)·e ^jθ(t)

=a(t)cosθ(t)+ja(t)sinθ(t) （2-10）

=z _BI(t)+jz _BQ(t)

In formula

z _BI(t)=a(t)cosθ(t) （2-11）

z _BQ(t)=a(t)sinθ(t) （2-12）

Be called the in-phase component (Inphase Component) and quadrature component (Quadr ature Component) of baseband signal, this is also that electromagnetic wave sampled signal is carried out sine and cosine mixing conversion, and after LPF, generate the mixed components z of the process generation of mixed frequency signal _bIand z (t) _bQ(t), z _bIand z (t) _bQ(t) be also referred to as quadrature component.

Therefore, the amplitude a of arrowband electromagnetic wave signal (t), phase place be respectively:

$a\left(t\right)=\sqrt{{z_{\mathrm{BI}}}^2\left(t\right)+{z_{\mathrm{BQ}}}^2\left(t\right)}---(2-13)$

$\mathrm{\φ}\left(t\right)=\arctan \left(\frac{z_{\mathrm{BQ}}}{z_{\mathrm{BI}}}\right)---(2-14)$

Fig. 1 is a kind of method flow diagram with boring an embodiment of electromagnetic resistivity measuring method of the present invention.As shown in the figure, comprising with boring electromagnetic resistivity measuring method in the present embodiment:

Step S101, the electromagnetic wave power signal of generation CF; Step S102, is transmitted into described electromagnetic wave power signal in stratum by transmitting antenna coil; Step S103, receives respectively the electromagnetic wave power signal that contains tested formation information by two receiving antenna coils, generate the electromagnetic wave power signal that two-way contains tested formation information; Step S104, the electromagnetic wave power signal that described two-way is contained to tested formation information carries out respectively bandpass filtering, and the electromagnetic wave power signal that the two-way after bandpass filtering is contained to tested formation information generates two-way electromagnetic wave sampled digital signal after sampling by AD; Step S105, carries out mixing conversion and LPF to each road electromagnetic wave sampled digital signal of described two-way electromagnetic wave sampled signal, generates amplitude information and the phase information of each road electromagnetic wave sampled digital signal; Step S106, according to amplitude information and the phase information of described two-way electromagnetic wave sampled digital signal, generates amplitude ratio and the phase difference of described two-way electromagnetic wave sampled digital signal; Step S107, according to described amplitude ratio and phase difference, according to chart, inverting generates the resistivity chart board of described electromagnetic wave power signal.

In step S101, as shown in Figure 2, the step that produces the electromagnetic wave power signal of CF comprises: step S1010, produces the electromagnetic wave power signal of required frequency by signal locking ring; Step S1011, by D power-like amplifier, generates tuning required AC power signal by described electromagnetic wave power signal; Step S1012, described AC power signal is according to tune drive signal, the sinusoidal high-voltage power pumping signal of tuning generation; Step S1013, is loaded into described sinusoidal high-voltage power pumping signal on described transmitting antenna coil, and by step S102, it is transmitted in stratum respectively by described transmitting antenna coil.

In the present embodiment, the electromagnetic wave power signal producing is 500KHz or 2MHz, and its phase locked looped function by high temperature FPGA device produces, frequency that not only can automatic calibration desired signal, and can produce the frequency signal of any dutycycle, can effectively eliminate the impact of temperature drift on it.The frequency signal that dutycycle is adjustable is used to form the driving signal that drives the required band " dead band " of D power-like amplifier.Although belonging to voltage-type, the switch element of D power-like amplifier drives, but the junction capacity in switching component inside is set up voltage, or need to a certain degree input current, and the pin output current of fpga chip is limited in one's ability, can not be directly used in the switching component that drives D power-like amplifier, therefore between adds special-purpose driving element, strengthens driving force, and D power-like amplifier is normally worked.D class power amplification unit is for generation of tuning needed AC power signal, this signal is by tune drive signal, and 500KHz and 2MHz drive signal, switch corresponding tuning network, tuningly become sinusoidal high-voltage power pumping signal, the power that is about to electromagnetic wave power signal reaches peak value.The components and parts of tuning network are selected very important, the quality factor of components and parts, temperature float with the parameter such as precision on tuning can successfully affect very large.

In step S102, describedly by transmitting antenna coil, electromagnetic wave power signal is transmitted in stratum, comprise: by four transmitting antenna coils, described electromagnetic wave power signal is transmitted in stratum, described electromagnetic wave power signal be 500KHz or 2MHz, timesharing sends, by two receiving antenna coils, receive described electromagnetic wave power signal, generate four groups of amplitudes ratios and four groups of phase differences.

In the present embodiment, the implication that timesharing sends is: if four transmitting antenna coils are n1, n2, n3, n4, n1 coil sends the electromagnetic wave power signal of 500KHz constantly at T1, n2 coil sends the electromagnetic wave power signal of 2MHz constantly at T2, n3 coil sends the electromagnetic wave power signal of 500KHz constantly at T3, n4 coil sends the electromagnetic wave power signal of 500KHz constantly at T4, n1 coil sends the electromagnetic wave power signal of 2MHz constantly at T5, n2 coil sends the electromagnetic wave power signal of 2MHz constantly at T6, n3 coil sends the electromagnetic wave power signal of 500KHz constantly at T7, n4 coil sends the electromagnetic wave power signal of 2MHz constantly at T8, by four transmitting antenna coils, the electromagnetic wave power signal cross timesharing of 500KHz and 2MHz is sent, thereby can detect dark, in, four groups of amplitudes ratios and four groups of phase differences of shallow different depth, can greatly reduce the asymmetry that two-way receiving system is measured.

In step S103, by two receiving antenna coils, receive respectively the electromagnetic wave power signal that contains tested formation information, generate the electromagnetic wave power signal that two-way contains tested formation information.In the present embodiment, electromagnetic wave power signal to any one transmitting antenna coil transmitting, there are two receiving antenna coils to receive, can generate two paths of signals, and, described electromagnetic wave power signal is behind stratum, and the signal that receiving antenna coil receives has included formation information.

In step S104, as shown in Figure 3, the electromagnetic wave power signal that described two-way is contained to tested formation information carries out respectively bandpass filtering, and the step that the electromagnetic wave power signal that the two-way after bandpass filtering is contained to tested formation information generates two-way electromagnetic wave sampled digital signal after sampling by AD comprises:

Step S1040, the electromagnetic wave power signal that described two-way is contained to tested formation information carries out self-adapting tuning; Step S1041, by preamplifier, carries out preposition amplification processing to the signal after self-adapting tuning; Step S1042, carries out secondary amplification processing to the signal carrying out after preposition amplification processing, generates the electromagnetic wave signal that carries out bandpass filtering; Step S1043, carries out respectively bandpass filtering to the electromagnetic wave power signal carrying out after secondary amplification is processed; Step S1044, the electromagnetic wave power signal that the two-way after bandpass filtering is contained to tested formation information carries out AD sampling.

In the present embodiment, the decay of propagating in stratum due to electromagnetic wave is very large, and the electromagnetic wave data that receiving antenna coil receives need tuning equally, maximum in order to guarantee required frequency signal amplitude, and other frequency signal amplitudes are less, reduce the interference of other frequency signals to circuit.The automatic adaptive that the frequency characteristic of components and parts of utilizing self-adapting tuning has realized 500KHZ and 2MHZ signal tuning switches, and it switches engineering does not need manual intervention.Two-way after tuning receives signal and after transformer coupled, imports preamplifier into, owing to receiving electromagnetic wave signal, belong to relative high frequency signal category, for considering resistance matching problem between the input and output of amplifiers at different levels, contribute to reduce the standing wave effect of signal, these are different from low frequency signal amplification transmission circuit.The output signal of preamplifier is carried out secondary again and is amplified processing, makes it be able to processed amplitude range requirement.The adjustment of the frequency characteristic of secondary amplifying circuit and signal to noise ratio parameter is very important, and it will affect the precision to Digital Signal Processing below.The electromagnetic wave signal amplifying through secondary, before being carried out signal waveform collection by AD device, need to carry out bandpass filtering, and the reason of this processing is that the collection of AD Wave data must meet formula wherein, f ₀for the received electromagnetic wave signal of receiving coil.This formula requires the sample frequency of sampled signal must be greater than the more than 2 times of low frequency signal frequency that reflect formation resistivity information, i.e. f _s>=2B.And receive signal by receiving antenna coil, also has radio-frequency component, the data processing after impact sampling.Carry out bandpass filtering and can effectively suppress equally the logical frequency content of non-band in electromagnetic resistivity signal.

Carry out the design of the bandpass filter of bandpass filtering and used novel SCF part, the cut-off frequency steeper of the fourth-order band-pass wave filter of its formation.The signal of process bandpass filter, before carrying out AD collection, need to guarantee the accuracy of sample frequency.The data that AD sampling obtains so just can, by correct processing, calculate amplitude and the phase information of the electromagnetic wave signal being sampled.But due to high with the operating ambient temperature that bores electromagnetic resistivity measuring system, produce the rising generation drift of the crystal oscillator Yin Wendu of sample frequency, but for guaranteeing that the correctness of sampling should produce the needed clock signal of system various piece by same crystal oscillator source, can be reduced to minimum by the impact of temperature like this.

In step S105, as shown in Figure 4, each road electromagnetic wave sampled digital signal to described two-way electromagnetic wave sampled signal carries out mixing conversion and LPF, generate amplitude information and the phase information of each road electromagnetic wave sampled digital signal, its step comprises: step S1050, described each road electromagnetic wave sampled digital signal is carried out to sine and cosine mixing conversion, generate mixed frequency signal, its formula is I (n)=X (n) cos ω ₀n and Q (n)=X (n) sin ω ₀n; Wherein X (n) is electromagnetic wave sampled signal; Step S1051, carries out LPF to described mixed frequency signal, generates in-phase component and the quadrature component of mixed frequency signal: $\begin{array}{c}{x}_{\mathrm{BI}}\left(n\right)=a\left(n\right)\cos \mathrm{\φ}\left(n\right)\\ x_{\mathrm{BQ}}\left(n\right)=a\left(n\right)\sin \mathrm{\φ}\left(n\right)\end{array};$ Wherein a (n) is the low frequency signal of reflection formation resistivity; Step S1052, according to described in-phase component and quadrature component, by formula with obtain amplitude information and the phase information of each road electromagnetic wave sampled digital signal of reflection formation resistivity.

In step S106, according to amplitude information and the phase information of described two-way electromagnetic wave sampled digital signal, the amplitude ratio and the phase difference that generate described two-way electromagnetic wave sampled digital signal, comprising: if the amplitude of first via electromagnetic wave sampled digital signal is a1 (t), phase place is if the amplitude of the second road electromagnetic wave sampled digital signal is a2 (t), phase place is the amplitude of described two-way electromagnetic wave sampled digital signal ratio and phase difference are respectively: a (t)=a1 (t)/a2 (t),

In step S107, according to described four groups of amplitudes ratios and four groups of phase differences, according to chart, inverting generates the resistivity chart board of described electromagnetic wave power signal, comprising:

According to described four groups of amplitudes ratio and four groups of phase differences, in conjunction with the result of boring sample Petrophysical measurement in location, described stratum, and the resistivity of well measurements is faced, generation resistivity chart board in the described area of reference.Because this step is existing comparatively ripe technology, therefore no longer describe in detail.

Fig. 5 is a kind of structural representation with boring an embodiment of electromagnetic wave resistivity survey apparatus of the present invention.As shown in the figure, comprising with boring electromagnetic wave resistivity survey apparatus of the embodiment of the present invention:

Electromagnetic wave power signal generation device 101, for generation of the electromagnetic wave power signal of CF; Transmitting antenna coil 102, for being transmitted into stratum by the described electromagnetic wave power signal producing; Two receiving antenna coils 103, for receiving the electromagnetic wave power signal that contains tested formation information, generate the electromagnetic wave power signal that two-way contains tested formation information; Electromagnetic wave sampled signal generating apparatus 104, for electromagnetic wave power signal that described two-way is contained to tested formation information, carry out respectively bandpass filtering, and the electromagnetic wave power signal that the two-way after bandpass filtering is contained to tested formation information generates two-way electromagnetic wave sampled digital signal after sampling by AD; Amplitude information and phase information generating apparatus 105, carry out mixing conversion and LPF for each the road electromagnetic wave sampled digital signal to described two-way electromagnetic wave sampled signal, generates amplitude information and the phase information of each road electromagnetic wave sampled digital signal; Amplitude ratio and phase difference generating apparatus 106, for according to amplitude information and the phase information of described two-way electromagnetic wave sampled digital signal, generate amplitude ratio and the phase difference of described two-way electromagnetic wave sampled digital signal; Resistivity chart board generating apparatus 107, for comparing and phase difference according to described amplitude, according to chart, inverting generates the resistivity chart board of described electromagnetic wave power signal.

In the present embodiment, four transmitting antenna coils 102 and two receiving antenna coils 103 are arranged in non magnetic drill collar, as shown in Figure 6, for the embodiment of the present invention with the transmitting antenna coil and the structural representation of receiving antenna coil in non magnetic drill collar that bore in electromagnetic wave resistivity survey apparatus.

Wherein, bogey main body is non magnetic drill collar 1, and mud slurry channels 2 is positioned at drill collar center, and 6 is circuit cabin body.Transmitting antenna coil 102 comprises that four transmitting antenna coils 3,4(3,4 comprise respectively two transmitting antenna coils), it is arranged on the two ends of non magnetic drill collar 1, the 5(that two receiving antenna coils 103 are in figure comprises two receiving antenna coils), it is arranged on the middle part of non magnetic drill collar 1, forms four two electromagnetic wave signals of receiving and measures array.Four two take-up circles that the embodiment of the present invention adopts have been realized the resistivity measurements with borehole compensation function.Adopt 500KHz and 2MHz double frequency-band, double source apart from energisation mode, footpath upwards can obtain the resistivity measurements of 4 investigation depths, has contained each measured zone of flushed zone, intermediate zone and undisturbed formation.

Fig. 7 is the structural representation with the electromagnetic wave power signal generation device in brill electromagnetic wave resistivity survey apparatus of the embodiment of the present invention.As shown in the figure, the electromagnetic wave power signal generation device in the present embodiment comprises:

Signal generation apparatus 1010, for producing the electromagnetic wave power signal of required frequency by signal locking ring; D power-like amplifier 1011, for outputing to tuner by described electromagnetic wave power signal driver; Tuner 1012, for according to tune drive signal, the sinusoidal high-voltage power pumping signal of tuning generation is also loaded on described transmitting antenna coil 3,4, by described transmitting antenna coil 3,4, is transmitted in stratum respectively.In the present embodiment, also comprise power amplifier drive unit 1013, for D power-like amplifier is driven.

In the present embodiment, signal generation apparatus 1010 can be FPGA, use the phase locked looped function of high temperature FPGA device to produce transmitting of required frequency, the digital phase-locked loop function of FPGA device is very powerful, frequency that not only can automatic calibration desired signal, and can produce the frequency signal of any dutycycle.

The 500KHz producing and 2MHz frequency signal are by power amplifier drive unit 1013, drive D power-like amplifier 1011, power signal with " dead band " is outputed to 500KHz, 2MHz frequency tuning device 1012, this signal tuning is become to sinusoidal high-voltage power pumping signal and be loaded on transmitting antenna coil 3,4, transmitting antenna coil 3,4 is positioned at the two ends of boring ship without magnetic.In the present embodiment, tuner is two, is used for respectively the frequency of tuning 500khz and 2Mhz.

The adjustable frequency signal of dutycycle that signal generation apparatus 1010 generates is used to form the driving signal that drives the required band " dead band " of D power-like amplifier.Although belonging to voltage-type, the switch element of D power-like amplifier 1011 drives, but the junction capacity in switching component inside is set up voltage, or need to a certain degree input current, and the pin output current of fpga chip is limited in one's ability, can not be directly used in the switching component that drives D power-like amplifier 1011, between adds special-purpose driving element, strengthens driving force, and D power-like amplifier 1011 is normally worked.D power-like amplifier 1011 is for generation of tuning needed AC power signal, and this signal is transmitted in stratum and is gone by antenna system.Transmitting antenna tuned cell drives signal according to 500KHz and 2MHz, switch corresponding tuner 1012, make the power of transmitting coil electromagnetic wave signal reach peak value, the components and parts of tuner 1012 are selected very important, the quality factor of components and parts, temperature is floated with parameters such as precision very large on the impact of tuning success.

Fig. 8 is the structural representation with the electromagnetic wave sampled signal generating apparatus in brill electromagnetic wave resistivity survey apparatus of the embodiment of the present invention.As shown in the figure, the electromagnetic wave sampled signal generating apparatus of the present embodiment comprises: self-adapting tuning device 1040, carries out self-adapting tuning for the electromagnetic wave power signal that described two-way is contained to tested formation information; Preamplifier 1041, carries out preposition amplification processing for the signal to after self-adapting tuning; In put device 1042, for carrying out secondary and amplify and process carrying out signal after preposition amplification processing; Bandpass filter 1043, for carrying out bandpass filtering to the described electromagnetic wave signal carrying out after secondary amplification; AD sampling apparatus 1044, carries out AD sampling for the electromagnetic wave signal to after described bandpass filtering, generates two-way electromagnetic wave sampled digital signal.

In the present embodiment, self-adapting tuning device 1040 is LC self-adapting tuning, bandpass filter 1043 is 4 rank active band-pass filters, after band-pass filter, becoming can be by the narrow band signal of data signal algorithm process, and this signal becomes the electromagnetic wave sampled digital signal that can be processed by software after two-way AD sampling apparatus 1044.

In the present embodiment, the decay of propagating in stratum due to electromagnetic wave is very large, and the electromagnetic wave data that receiving antenna coil 5 receives need tuning equally, maximum in order to guarantee required frequency signal amplitude, and other frequency signal amplitudes are less, reduce the interference of other frequency signals to circuit.The automatic adaptive that the frequency characteristic of components and parts of utilizing self-adapting tuning device 1040 has realized 500KHz and 2MHz signal tuning switches, and it switches engineering does not need manual intervention.Two-way after tuning receives signal and after transformer coupled, imports preamplifier 1041 into, owing to receiving electromagnetic wave signal, belong to relative high frequency signal category, for considering resistance matching problem between the input and output of amplifiers at different levels, contribute to reduce the standing wave effect of signal, these are different from low frequency signal amplification transmission circuit.The output signal of preamplifier 1041 is carried out secondary again and is amplified processing, makes it be able to processed amplitude range requirement.The adjustment of the frequency characteristic of secondary amplifying circuit and signal to noise ratio parameter is very important, and it will affect the precision to Digital Signal Processing below.Through in put device 1042 and carried out electromagnetic wave signal after secondary amplification before being carried out signal waveform collection by AD sampling apparatus 1044, need to carry out bandpass filtering, the reason of this processing is that the collection of AD Wave data must meet formula wherein, f ₀for the received electromagnetic wave signal of receiving coil.This formula requires the sample frequency of sampled signal must be greater than the more than 2 times of low frequency signal frequency that reflect formation resistivity information, i.e. f _s>=2B.

This be because, in tradition electromagnetic resistivity software measurement method, needing to meet is the sample frequency of Qwest's sampling thheorem, in the middle of reality is used, this sample frequency need to be higher than tens times of measured resistivity electromagnetic wave signal sample frequency, with boring electromagnetic wave resistivity survey apparatus, produce high precision, the sample frequency of high frequency is difficult to, the frequency band of the electromagnetic wave signal x (t) of measured resistivity is between 0-500KHz and 0-2MHz, if sample frequency fs>10fH carries out equal interval sampling to X (t), obtain time-discrete sampled signal x (n)=x (nTs) (wherein Ts=1/fs is called the sampling interval), the characteristic parameter of the electromagnetic wave signal x (t) of former reflected resistance rate, to be reflected really and accurately by resulting sampled value x (n).But to its frequency of the electromagnetic wave signal of measured resistivity, be 500KHz and 2MHz, according to being the sampling with high precision signal that Qwest's sampling law need to produce 10*500KHz and 10*2MHz.This is for very difficult with boring electromagnetic wave resistivity survey apparatus.If be a band-limited signal but measure electromagnetic resistivity signal, in sample frequency fs>2fH, just can reflect completely the resistivity situation on stratum in electromagnetic resistivity signal, this is that the electromagnetic wave signal that is equivalent to high frequency is modulated by stratum in by stratum, this is the low frequency signal of having modulated reflection formation resistivity parameter on electromagnetic wave signal, because so low its of frequency of this low frequency signal is a band-limited signal and smaller bandwidth, this is as long as the sample frequency of electromagnetic resistivity measuring system is greater than the bandwidth of 2 times of these low frequency signals, just can truly reflect formation resistivity situation, therefore before carrying out AD sampling, need to the electromagnetic resistivity signal filtering of measurement be become to a band-limited signal with bandpass filter, with certain sample frequency, go sampling again, because the signal frequency of reflection formation resistivity is very low.With boring very low that the sample frequency of electromagnetic resistivity measuring system for this signal just can arrange, and the frequency of the electromagnetic wave signal that can launch lower than transmitting coil.Their relation has relational expression and f _s>=2B determines, f0=(fH+fL)/2 wherein, and n gets the maximum integer that can meet (B=fH-fL), and frequency f 0 is the signal frequency that electromagnetic resistivity receiving coil receives, and B is the bandwidth frequency of the band-limited signal of reflection stratum electromagnetic resistivity.And receive signal by receiving antenna coil, also has radio-frequency component, the data processing after impact sampling.Carry out bandpass filtering and can effectively suppress equally the logical frequency content of non-band in electromagnetic resistivity signal.

Carry out the design of the bandpass filter of bandpass filtering and used novel SCF part, the cut-off frequency steeper of the fourth-order band-pass wave filter of its formation.The signal of process bandpass filter, before carrying out AD collection, need to guarantee the accuracy of sample frequency.The data that AD sampling obtains so just can, by correct processing, calculate amplitude and the phase information of the electromagnetic wave signal being sampled.But due to high with the operating ambient temperature that bores electromagnetic resistivity measuring system, produce the rising generation drift of the crystal oscillator Yin Wendu of sample frequency, but for guaranteeing that the correctness of sampling should produce the needed clock signal of system various piece by same crystal oscillator source, can be reduced to minimum by the impact of temperature like this.

In the present embodiment, as shown in Figure 9, described amplitude information and phase information generating apparatus 105 comprise: mixer device 1050, for described two-way electromagnetic wave sampled signal being carried out respectively to sine and cosine mixing conversion, generate mixed frequency signal, its formula is I (n)=X (n) cos ω ₀n and Q (n)=X (n) sin ω ₀n, wherein X (n) is electromagnetic wave sampled signal; Low-pass filter 1051, for described mixed frequency signal is carried out to LPF, generates in-phase component and the quadrature component of mixed frequency signal: $\begin{array}{c}{x}_{\mathrm{BI}}\left(n\right)=a\left(n\right)\cos \mathrm{\φ}\left(n\right)\\ x_{\mathrm{BQ}}\left(n\right)=a\left(n\right)\sin \mathrm{\φ}\left(n\right)\end{array};$ Wherein a (n) is the low frequency signal of reflection formation resistivity; Amplitude information and phase information calculation element 1052, for according to described in-phase component and quadrature component, by formula with obtain amplitude information and the phase information of each road electromagnetic wave sampled digital signal of reflection formation resistivity.

Figure 10 is the amplitude information of the embodiment of the present invention and the theory diagram that phase information generating apparatus 105 carries out algorithm process process.The signal being sampled is respectively through sinusoidal and cosine mixing conversion, and its formula is I (n)=X (n) cos ω ₀n and Q (n)=X (n) sin ω ₀n, then after FIR low pass filter, produce in-phase component and quadrature component $\begin{array}{c}{x}_{\mathrm{BI}}\left(n\right)=a\left(n\right)\cos \mathrm{\φ}\left(n\right)\\ x_{\mathrm{BQ}}\left(n\right)=a\left(n\right)\sin \mathrm{\φ}\left(n\right)\end{array},$ Wherein a (n) is the low frequency signal of reflection formation resistivity.Finally, by formula $a\left(n\right)=\sqrt{{x_{\mathrm{BI}}}^2\left(n\right)+{x_{\mathrm{BQ}}}^2\left(n\right)},$ With $\mathrm{\φ}\left(n\right)=\arctan \left(\frac{x_{\mathrm{BQ}}}{x_{\mathrm{BI}}}\right),$ Can obtain respectively amplitude information and the phase information of the signal of reflection formation resistivity.

In the present embodiment, amplitude ratio and phase difference generating apparatus 106, for according to amplitude information and the phase information of described two-way electromagnetic wave sampled digital signal, generate amplitude ratio and the phase difference of described two-way electromagnetic wave sampled digital signal, comprising:

If the amplitude of first via electromagnetic wave sampled digital signal is a1 (t), phase place is if the amplitude of the second road electromagnetic wave sampled digital signal is a2 (t), phase place is the amplitude of described two-way electromagnetic wave sampled digital signal ratio and phase difference are respectively: a (t)=a1 (t)/a2 (t),

In the present embodiment, resistivity chart board generating apparatus 107 is for comparing and four groups of phase differences according to four groups of described amplitudes, and according to chart, inverting generates the resistivity chart board of described electromagnetic wave power signal, comprising:

Figure 11 be utilize the embodiment of the present invention with boring electromagnetic wave resistivity survey apparatus and measuring method, carry out the design sketch after algorithm process.Wherein, the modulation signal that signal 21 is simulated formation, the electromagnetic wave signal of signal 22 for being modulated by stratum, signal 23,24 is Q component and I component through orthogonal processing, signal 25 is the I component after LPF and the synthetic simulated formation signal recovering of Q component.As can be seen from the figure: simulated formation modulating wave originally has uniformity highly with utilizing the simulated formation modulating wave that this method recovers, in phase place and amplitude, there is uniformity, not because sample frequency does not meet nyquist sampling law and causes the simulated formation modulating wave serious distortion after recovery.

The embodiment of the present invention this based on high frequency owe sampling algorithm with boring electromagnetic resistivity measuring method and measurement mechanism, hardware circuit is simple, analog device is few, and temperature on the impact of device a little less than.The present invention can be by lower sample rate concerning electromagnetic wave signal sample (this be because be a pair of conflicting technical data index for high sampling rate high temperature AD device and high accuracy), can select so the lower but high temperature AD device that sampling precision is high of sample frequency, electromagnetic wave signal is sampled, can improve the precision of measuring system, reduce the power attenuation that whole system operating frequency reduces whole system.

Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only specific embodiments of the invention; the protection domain being not intended to limit the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims (12)

1. with boring an electromagnetic resistivity measuring method, it is characterized in that, describedly with boring electromagnetic resistivity measuring method, comprise:

Produce the electromagnetic wave power signal of CF;

By transmitting antenna coil, described electromagnetic wave power signal is transmitted in stratum;

By two receiving antenna coils, receive respectively the electromagnetic wave power signal that contains tested formation information, generate the electromagnetic wave power signal that two-way contains tested formation information;

The electromagnetic wave power signal that described two-way is contained to tested formation information carries out respectively bandpass filtering, and the electromagnetic wave power signal that the two-way after bandpass filtering is contained to tested formation information generates two-way electromagnetic wave sampled digital signal after sampling by AD;

Each road electromagnetic wave sampled digital signal to described two-way electromagnetic wave sampled signal carries out mixing conversion and LPF, generates amplitude information and the phase information of each road electromagnetic wave sampled digital signal;

According to amplitude information and the phase information of described two-way electromagnetic wave sampled digital signal, generate amplitude ratio and the phase difference of described two-way electromagnetic wave sampled digital signal;

According to described amplitude ratio and phase difference, according to chart, inverting generates the resistivity chart board of described electromagnetic wave power signal;

Wherein, producing the electromagnetic wave power signal of CF the step being transmitted in stratum by transmitting antenna coil comprises:

By signal locking ring, produce the electromagnetic wave power signal of required frequency;

Described electromagnetic wave power signal, by D power-like amplifier, is generated to tuning required AC power signal;

Described AC power signal is according to tune drive signal, the sinusoidal high-voltage power pumping signal of tuning generation;

Described sinusoidal high-voltage power pumping signal is loaded on described transmitting antenna coil, and is transmitted in stratum respectively by described transmitting antenna coil.

2. as claimed in claim 1ly with boring electromagnetic resistivity measuring method, it is characterized in that, describedly by transmitting antenna coil, electromagnetic wave power signal be transmitted in stratum, comprising:

By four transmitting antenna coils, described electromagnetic wave power signal is transmitted in stratum, described electromagnetic wave power signal be 500KHz or 2MHz, timesharing sends, and by two receiving antenna coils, receives described electromagnetic wave power signal, generates four groups of amplitudes ratios and four groups of phase differences.

3. as claimed in claim 1 with boring electromagnetic resistivity measuring method, it is characterized in that, after receiving respectively the step of the electromagnetic wave power signal that contains tested formation information by two receiving antenna coils, the frequency electromagnetic waves power signal that described two-way is contained to tested formation information carries out respectively, before the step of bandpass filtering, also comprising:

The electromagnetic wave power signal that described two-way is contained to tested formation information carries out self-adapting tuning;

Signal after self-adapting tuning, by preamplifier, is carried out to preposition amplification processing;

The signal carrying out after preposition amplification processing is carried out to secondary amplification processing, generate the electromagnetic wave signal that carries out bandpass filtering.

4. as claimed in claim 1 with boring electromagnetic resistivity measuring method, it is characterized in that, described each road electromagnetic wave sampled digital signal to described two-way electromagnetic wave sampled signal carries out mixing conversion and LPF, generates the amplitude information of each road electromagnetic wave sampled digital signal and the step of phase information and comprises:

Described each road electromagnetic wave sampled digital signal is carried out to sine and cosine mixing conversion, generate mixed frequency signal, its formula is I (n)=X (n) cos ω ₀n and Q (n)=X (n) sin ω ₀n, wherein X (n) is electromagnetic wave sampled signal;

Described mixed frequency signal is carried out to LPF, generates in-phase component and the quadrature component of mixed frequency signal: $\begin{array}{c}{x}_{\mathrm{BI}}\left(n\right)=a\left(n\right)\cos \mathrm{\φ}\left(n\right)\\ x_{\mathrm{BQ}}\left(n\right)=a\left(n\right)\sin \mathrm{\φ}\left(n\right)\end{array},$ Wherein a (n) is the low frequency signal of reflection formation resistivity;

According to described in-phase component and quadrature component, by formula with obtain amplitude information and the phase information of each road electromagnetic wave sampled digital signal of reflection formation resistivity.

5. as claimed in claim 4ly with boring electromagnetic resistivity measuring method, it is characterized in that, according to amplitude information and the phase information of described two-way electromagnetic wave sampled digital signal, the amplitude that generates described two-way electromagnetic wave sampled digital signal than and phase difference, comprising:

If the amplitude of first via electromagnetic wave sampled digital signal is a1 (t), phase place is if the amplitude of the second road electromagnetic wave sampled digital signal is a2 (t), phase place is the amplitude of described two-way electromagnetic wave sampled digital signal ratio and phase difference are respectively: a (t)=a1 (t)/a2 (t),

6. as claimed in claim 2ly with boring electromagnetic resistivity measuring method, it is characterized in that, according to four groups of described amplitudes than and four groups of phase differences, according to chart, inverting generates the resistivity chart board of described electromagnetic wave power signal, comprising:

According to described four groups of amplitudes ratio and four groups of phase differences, in conjunction with the result of boring sample Petrophysical measurement in location, described stratum, and the resistivity of well measurements is faced, generation resistivity chart board in the described area of reference.

7. with boring an electromagnetic wave resistivity survey apparatus, it is characterized in that, describedly with boring electromagnetic wave resistivity survey apparatus, comprise:

Electromagnetic wave power signal generation device, for generation of the electromagnetic wave power signal of CF;

Transmitting antenna coil, for being transmitted into stratum by the described electromagnetic wave power signal producing;

Two receiving antenna coils, for receiving the electromagnetic wave power signal that contains tested formation information, generate the electromagnetic wave power signal that two-way contains tested formation information;

Electromagnetic wave sampled signal generating apparatus, for electromagnetic wave power signal that described two-way is contained to tested formation information, carry out respectively bandpass filtering, and the electromagnetic wave power signal that the two-way after bandpass filtering is contained to tested formation information generates two-way electromagnetic wave sampled digital signal after sampling by AD;

Amplitude information and phase information generating apparatus, carry out mixing conversion and LPF for each the road electromagnetic wave sampled digital signal to described two-way electromagnetic wave sampled signal, generates amplitude information and the phase information of each road electromagnetic wave sampled digital signal;

Amplitude ratio and phase difference generating apparatus, for according to amplitude information and the phase information of described two-way electromagnetic wave sampled digital signal, generate amplitude ratio and the phase difference of described two-way electromagnetic wave sampled digital signal;

Resistivity chart board generating apparatus, for comparing and phase difference according to described amplitude, according to chart, inverting generates the resistivity chart board of described electromagnetic wave power signal;

Wherein, described electromagnetic wave power signal generation device comprises:

Signal generation apparatus, for producing the electromagnetic wave power signal of required frequency by signal locking ring;

D power-like amplifier, for outputing to tuner by described electromagnetic wave power signal driver;

Tuner, for according to tune drive signal, the sinusoidal high-voltage power pumping signal of tuning generation is also loaded on described transmitting antenna coil, by described transmitting antenna coil, is transmitted in stratum respectively.

8. as claimed in claim 7 with boring electromagnetic wave resistivity survey apparatus, it is characterized in that, the number of described transmitting antenna coil is four, the electromagnetic wave power signal of described generation be 500KHz or 2MHz, timesharing sends, by two receiving antenna coils, receive described electromagnetic wave power signal, generate four groups of amplitudes ratios and four groups of phase differences.

9. as claimed in claim 7ly with boring electromagnetic wave resistivity survey apparatus, it is characterized in that, described electromagnetic wave sampled signal generating apparatus comprises:

Self-adapting tuning device, carries out self-adapting tuning for the electromagnetic wave power signal that described two-way is contained to tested formation information;

Preamplifier, carries out preposition amplification processing for the signal to after self-adapting tuning;

In put device, for carrying out secondary and amplify and process carrying out signal after preposition amplification processing;

Bandpass filter, for carrying out bandpass filtering to the described electromagnetic wave signal carrying out after secondary amplification;

AD sampling apparatus, carries out AD sampling for the electromagnetic wave signal to after described bandpass filtering, generates two-way electromagnetic wave sampled digital signal.

10. as claimed in claim 7ly with boring electromagnetic wave resistivity survey apparatus, it is characterized in that, described amplitude information and phase information generating apparatus comprise:

Mixer device, for described two-way electromagnetic wave sampled signal being carried out respectively to sine and cosine mixing conversion, generates mixed frequency signal, and its formula is I (n)=X (n) cos ω ₀n and Q (n)=X (n) sin ω ₀n, wherein X (n) is electromagnetic wave sampled signal;

Low-pass filter, for described mixed frequency signal is carried out to LPF, generates in-phase component and the quadrature component of mixed frequency signal: $\begin{array}{c}{x}_{\mathrm{BI}}\left(n\right)=a\left(n\right)\cos \mathrm{\φ}\left(n\right)\\ x_{\mathrm{BQ}}\left(n\right)=a\left(n\right)\sin \mathrm{\φ}\left(n\right)\end{array},$ Wherein a (n) is the low frequency signal of reflection formation resistivity;

Amplitude information and phase information calculation element, for according to described in-phase component and quadrature component, by formula $a\left(n\right)=\sqrt{{x_{\mathrm{BI}}}^2\left(n\right)+{x_{\mathrm{BQ}}}^2\left(n\right)},$ With $\mathrm{\φ}\left(n\right)=\arctan \left(\frac{x_{\mathrm{BQ}}}{x_{\mathrm{Bi}}}\right),$ Obtain amplitude information and the phase information of each road electromagnetic wave sampled digital signal of reflection formation resistivity.

11. is as claimed in claim 10 with boring electromagnetic wave resistivity survey apparatus, it is characterized in that, described amplitude ratio and phase difference generating apparatus are used for according to amplitude information and the phase information of described two-way electromagnetic wave sampled digital signal, the amplitude ratio and the phase difference that generate described two-way electromagnetic wave sampled digital signal, comprising:

If the amplitude of first via electromagnetic wave sampled digital signal is a1 (t), phase place is if the amplitude of the second road electromagnetic wave sampled digital signal is a2 (t), phase place is the amplitude of described two-way electromagnetic wave sampled digital signal ratio and phase difference are respectively: a (t)=a1 (t)/a2 (t),

12. is as claimed in claim 8 with boring electromagnetic wave resistivity survey apparatus, it is characterized in that, described resistivity chart board generating apparatus is used for according to described four groups of amplitudes ratios and four groups of phase differences, and according to chart, inverting generates the resistivity chart board of described electromagnetic wave power signal, comprising:

According to described four groups of amplitudes ratio and four groups of phase differences, in conjunction with the result of boring sample Petrophysical measurement in location, described stratum, and the resistivity of well measurements is faced, generation resistivity chart board in the described area of reference.