CN105588934A - Detecting method, device and system for petroleum molecular structure - Google Patents

Abstract

The invention provides a detecting method, device and system for a petroleum molecular structure. The method includes the steps that impulse sequences are applied to a petroleum sample, and T1/T2 distribution of petroleum molecules is obtained; according to the T1/T2 distribution, the re-orientation time of the petroleum molecules is determined; according to the re-orientation time and the T1 distribution of the petroleum molecules, 1H-1H interval distribution of the petroleum molecules is determined; according to the 1H-1H interval distribution, the petroleum molecular structure is determined. By means of the detecting method, device and system for the petroleum molecular structure, the structures of the petroleum molecules can be rapidly detected, the detecting efficiency is improved, operation is easy, chemical reagents do not need to be added into the petroleum sample, the petroleum sample can not be polluted, and the application range is wide.

Description

Oil molecular structure detection method, Apparatus and system

Technical field

The present invention relates to oil exploration technology field, relate in particular to a kind of oil molecular structure detection method, install and beSystem.

Background technology

Oil is a kind of pitchy or the sticky liquid state of dirty-green or semi-solid combustible, generally by various hydro carbons groupsBecome. The detection of the molecular structure to oil, the especially detection to crude oil molecular structure, for oil exploitation, refinery and transportHave great importance.

In prior art, the detection of oil molecular structure is generally carried out in laboratory, need to be at stone in the time detectingIn oil, add chemical reagent, and obtain oil molecular structure by chemical apparatuses analysis. This method has complex steps, consuming timeLong and the necessary deficiencies such as chemical reagent of adding. At present, provide a kind of method that can fast detecting oil molecular structure to become urgentlyProblem to be solved.

Summary of the invention

The invention provides a kind of oil molecular structure detection method, Apparatus and system, pass through in order to solve in prior artChemical method detects oil molecular structure longer technical problem consuming time.

The invention provides a kind of oil molecular structure detection method, comprising:

By oil sample is applied to pulse train, obtain the T of oil molecule₁/T₂Distribute;

According to described T₁/T₂Distribute and determine the reorientation time of oil molecule;

According to the T of described reorientation time and oil molecule₁Oil molecule is determined in distribution¹H-¹H spacing distributes;

According to¹H-¹H spacing distributes and determines oil molecular structure.

Further, by oil sample is applied to pulse train, obtain the T of oil molecule₁/T₂Distribute, specifically comprise:

Described oil sample is applied to x DE pulse train, 180 degree X-axis direct impulse and y FIR pulses successivelySequence, obtains T₁The the first amplitude A distributing_DEFIR(lgT₁)；

Described oil sample is applied to y FIR pulse train successively, obtain echo-signal, described echo-signal is carried outInversion procedure, obtains T₁The the second amplitude A distributing_FIR(lgT₁)；

According to described T₁The the first amplitude A distributing_DEFIRAnd described T (lgT1)₁The the second amplitude A distributing_FIR(lgT₁) obtainT₁Distribute and T₁/T₂The functional relation distributing;

According to T₁Distribute and T₁/T₂The functional relation distributing, determines T₁/T₂Distribute;

Wherein, x, y are natural number, and x >=2, y >=2.

Further, according to described T₁/T₂Distribute and determine the reorientation time of oil molecule, specifically comprise:

Determine the described reorientation time according to following formula:

$\frac{T_1}{T_2}=\frac{1}{2}\frac{5{(1+{\mathrm{\ω}}^2{{\mathrm{\τ}}_c}^2)}^{-1}+2{(1+4{\mathrm{\ω}}^2{{\mathrm{\τ}}_c}^2)}^{-1}+3}{{(1+{\mathrm{\ω}}^2{{\mathrm{\τ}}_c}^2)}^{-1}+4{(1+4{\mathrm{\ω}}^2{{\mathrm{\τ}}_c}^2)}^{-1}}$

Wherein, τ_cFor orientation again, ω=2 π f, f is¹The Larmor frequency of H.

Further, according to the T of described reorientation time and oil molecule₁Oil molecule is determined in distribution¹H-¹H spacingDistribute, specifically comprise:

Described in determining according to following formula¹H-¹H spacing distributes:

Wherein, γ is magnetic conductivity,For Planck's constant is divided by 2 π, b be in molecule two adjacent¹H-¹Distance between H,μ₀For space permeability.

Further, according to¹H-¹H spacing distributes and determines oil molecular structure, specifically comprises:

According to the molecular structure of pre-stored with¹H-¹The corresponding relation that H spacing distributes, determines the molecular structure of oil sample.

The present invention also provides a kind of oil molecular structure checkout gear, comprising:

Obtain module, for by oil sample is applied to pulse train, obtain the T of oil molecule₁/T₂Distribute;

The first determination module, for according to described T₁/T₂Distribute and determine the reorientation time of oil molecule;

The second determination module, for according to the T of described reorientation time and oil molecule₁Oil molecule is determined in distribution¹H-¹H spacing distributes;

The 3rd determination module, for basis¹H-¹H spacing distributes and determines oil molecular structure.

Further, described acquisition module specifically for:

Described oil sample is applied to x DE pulse train, 180 degree X-axis direct impulse and y FIR pulses successivelySequence, obtains T₁The the first amplitude A distributing_DEFIR(lgT₁)；

Described oil sample is applied to y FIR pulse train successively, obtain echo-signal, described echo-signal is carried outInversion procedure, obtains T₁The the second amplitude A distributing_FIR(lgT₁)；

According to described T₁The the first amplitude A distributing_DEFIRAnd described T (lgT1)₁The the second amplitude A distributing_FIR(lgT1) obtainT₁Distribute and T₁/T₂The functional relation distributing;

According to T₁Distribute and T₁/T₂The functional relation distributing, determines T₁/T₂Distribute;

Wherein, x, y are natural number, and x >=2, y >=2.

Further, described the first determination module specifically for:

Determine the described reorientation time according to following formula:

$\frac{T_1}{T_2}=\frac{1}{2}\frac{5{(1+{\mathrm{\ω}}^2{{\mathrm{\τ}}_c}^2)}^{-1}+2{(1+4{\mathrm{\ω}}^2{{\mathrm{\τ}}_c}^2)}^{-1}+3}{{(1+{\mathrm{\ω}}^2{{\mathrm{\τ}}_c}^2)}^{-1}+4{(1+4{\mathrm{\ω}}^2{{\mathrm{\τ}}_c}^2)}^{-1}}$

Wherein, τ_cFor orientation again, ω=2 π f, f is¹The Larmor frequency of H.

Further, described the second determination module specifically for:

Described in determining according to following formula¹H-¹H spacing distributes:

Wherein, γ is magnetic conductivity,For Planck's constant is divided by 2 π, b be in molecule two adjacent¹H-¹Distance between H,μ₀For space permeability.

The present invention also provides a kind of oil molecular structure detection system, comprises described in probe, spectrometer and above-mentioned any oneOil molecular structure checkout gear;

Wherein, described probe is for applying DEFIR pulse train and FIR pulse train to oil sample;

Described spectrometer is used for receiving echo-signal, and sends to described oil molecular structure to detect dress described echo-signalPut.

Oil molecular structure detection method provided by the invention, Apparatus and system, by applying pulse order to oil sampleRow, the T of acquisition oil molecule₁/T₂Distribute, according to described T₁/T₂Distribute and determine the reorientation time of oil molecule, according to instituteState the T of reorientation time and oil molecule₁Oil molecule is determined in distribution¹H-¹H spacing distributes, and according to¹H-¹H spacing distributesDetermine oil molecular structure, can detect rapidly the structure of oil molecule, improved the efficiency detecting, and simple to operate, noNeed add any chemical reagent to oil sample, also can not pollute oil sample, the scope of application is wider.

Brief description of the drawings

The flow chart of the oil molecular structure detection method that Fig. 1 provides for the embodiment of the present invention one;

Relaxation time and reorientation time in the oil molecular structure detection method that Fig. 2 provides for the embodiment of the present invention oneCorresponding relation figure;

In the oil molecular structure detection method that Fig. 3 provides for the embodiment of the present invention one, different molecular is corresponding¹H-¹H spacingDistribution map;

The flow chart of the oil molecular structure detection method that Fig. 4 provides for the embodiment of the present invention two;

The schematic diagram of DEFIR pulse train in the oil molecular structure detection method that Fig. 5 provides for the embodiment of the present invention two;

Two groups of oil sample that the oil molecular structure detection method that Fig. 6 provides for the employing embodiment of the present invention two obtainsT₁/T₂Distribution map;

The T of two groups of oil sample shown in Fig. 7 Fig. 6₁/T₂Corresponding reorientation time distribution map distributes;

Fig. 8 is the b distribution map that the reorientation time of two groups of oil sample shown in Fig. 7 distributes corresponding;

The structural representation of the oil molecular structure checkout gear that Fig. 9 provides for the embodiment of the present invention three.

Detailed description of the invention

For making object, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present inventionIn accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment isThe present invention's part embodiment, instead of whole embodiment. Based on the embodiment in the present invention, those of ordinary skill in the artNot making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of protection of the invention.

Embodiment mono-

The embodiment of the present invention one provides a kind of oil molecular structure detection method. Fig. 1 provides for the embodiment of the present invention oneThe flow chart of oil molecular structure detection method. As shown in Figure 1, the oil molecular structure detection method in the present embodiment, canComprise:

Step 101, by oil sample is applied to pulse train, obtain the T of oil molecule₁/T₂Distribute.

Oil in the present embodiment, can refer to the directly exploitation crude oil that out process is not processed from oil well, also canRefer to exploit out afterwards through processing oil after treatment, be not restricted herein.

The executive agent of the method in the present embodiment can be host computer, and host computer can be connected with spectrometer, spectrometer withProbe is connected. In this step, host computer can apply pulse train to oil sample by probe.

Wherein, the concrete form of described pulse train can arrange according to actual needs, divides as long as can obtain oilThe T of son₁/T₂Distribute, it should be noted that that emphasize is T here₁/T₂Distribute, instead of simple by measuring oil sampleProduct one dimension T₁Distribute and T₂After distribution, be the T that ratio obtains₁/T₂Data.

Wherein, T1 is longitudinal relaxation time, T₂For T2.

Step 102, according to described T₁/T₂Distribute and determine the reorientation time of oil molecule.

Particularly, the relaxation time of oil molecule with¹H-¹H spacing distributes and can be represented by two formulas below:

Wherein, γ is magnetic conductivity,Be Planck's constant divided by 2 π, ω=2 π f, f is¹The Larmor frequency of H, b is moleculeIn two adjacent¹H-¹Distance between H, i.e. distance between adjacent two hydrogen protons in molecule, μ₀Space permeability, conventionallyCan replace with the magnetic conductivity of air τ_cFor orientation is again molecule spin correlation time. T in formula₁Represent T₁PointCloth, T₂Represent T₂Distribute.

For hydrocarbon compound, the corresponding b of different molecular structures is also different, only requires certain hydrocarbonThe b of compounds distributes, and also just can infer the molecular structure that this compound, and stone main body of oil hydro carbons chemical combination justThing, this makes the detection of the crude oil molecular structure based on nuclear magnetic resonance technique become possibility.

Through type (1) and formula (2) can obtain the corresponding relation of relaxation time and reorientation time, and Fig. 2 is the present inventionThe corresponding relation figure of relaxation time and reorientation time in the oil molecular structure detection method that embodiment mono-provides. From Fig. 2In can probably find out T₁、T₂And τ_cBetween relation.

In order to eliminate the impact of b, formula (1) and formula (2) are divided by, can obtain:

$\frac{T_1}{T_2}=\frac{1}{2}\frac{5{(1+{\mathrm{\ω}}^2{{\mathrm{\τ}}_c}^2)}^{-1}+2{(1+4{\mathrm{\ω}}^2{{\mathrm{\τ}}_c}^2)}^{-1}+3}{{(1+{\mathrm{\ω}}^2{{\mathrm{\τ}}_c}^2)}^{-1}+4{(1+4{\mathrm{\ω}}^2{{\mathrm{\τ}}_c}^2)}^{-1}}---\left(3\right)$

So just can obtain the relaxation time compares T₁/T₂With τ_cBetween functional relation. In this step, can basisFormula (3) is determined τ_c。τ_cAll proportional with viscosity, molecular dimension, molecular weight, τ_cDistribution has characterized in a compound notThe population size of same size molecule.

Step 103, according to the T of described reorientation time and oil molecule₁Oil molecule is determined in distribution¹H-¹H spacingDistribute.

Particularly, determine T₁The method distributing belongs to prior art, repeats no more herein. Can determine stone according to formula (1)Oil samples¹H-¹H spacing distributes.

Step 104, basis¹H-¹H spacing distributes and determines oil molecular structure.

Particularly, different molecules is corresponding¹H-¹H spacing distributes and can determine in advance and store. Fig. 3 is the invention processIn the oil molecular structure detection method that example one provides, different molecular is corresponding¹H-¹H spacing distribution map. As shown in Figure 3, hydro carbons dividesSon is made up of carbon and hydrogen, molecular structure difference, and the distance between adjacent two hydrogen protons is also different, therefore, different molecule knotsStructure is corresponding¹H-¹H spacing distributes different.

In this step, according to the molecular structure of pre-stored with¹H-¹The corresponding relation that H spacing distributes, can determine oilThe molecular structure of sample.

Oil molecular structure detection method in the present embodiment can realize based on low-field nuclear magnetic resonance technology, can applyIn various types of low-field nuclear magnetic resonance probes, both can be applied to downhole logging instruments, also can be applicable to ground experiment chamber, andNo matter " Outside-in " or " Inside-out " detection mode all can be applied, but requires the magnetostatic field of probe generation and penetrateFrequently field is more even, so that collection signal obtains more excellent signal to noise ratio.

The oil molecular structure detection method that the present embodiment provides, by oil sample is applied to pulse train, obtains stoneThe T of oil molecule₁/T₂Distribute, according to described T₁/T₂Distribute and determine the reorientation time of oil molecule, according to described reorientationThe T of time and oil molecule₁Oil molecule is determined in distribution¹H-¹H spacing distributes, and according to¹H-¹H spacing distributes and determines oilMolecular structure, can detect the structure of oil molecule rapidly, has improved the efficiency detecting, and simple to operate, does not need oilSample adds any chemical reagent, also can not pollute oil sample, and the scope of application is wider.

Embodiment bis-

The embodiment of the present invention two provides a kind of oil molecular structure detection method. The present embodiment provides at embodiment mono-On the basis of technical scheme, utilize fast two-dimensional nuclear magnetic resonance pulse sequence to obtain T₁/T₂Distribution. Fig. 4 is the invention processThe flow chart of the oil molecular structure detection method that example two provides. As shown in Figure 4, the oil molecular structure in the present embodiment detectsMethod, can comprise:

Step 201, described oil sample is applied to x DE pulse train, one 180 degree X-axis direct impulse and y successivelyFIR pulse train, obtains T₁The the first amplitude A distributing_DEFIR(lgT₁)。

Step 202, described oil sample is applied to y FIR pulse train successively, obtain echo-signal, to described echoSignal carries out inversion procedure, obtains T₁The the second amplitude A distributing_FIR(lgT₁)。

Step 203, according to described T₁The the first amplitude A distributing_DEFIR(lgT₁) and described T₁The the second amplitude A distributing_FIR(lgT1) obtain T₁Distribute and T₁/T₂The functional relation distributing.

Step 204, according to T₁Distribute and T₁/T₂The functional relation distributing, determines T₁/T₂Distribute.

In the present embodiment, can obtain by step 201 to step 204 T of oil molecule₁/T₂Distribute. Particularly, originallyEmbodiment obtains the T of oil molecule by oil sample being applied to DEFIR pulse train and FIR pulse train₁/T₂Distribute.

The schematic diagram of DEFIR pulse train in the oil molecular structure detection method that Fig. 5 provides for the embodiment of the present invention two.As shown in Figure 5, described DEFIR pulse train comprises that DE (driven equilibrium) pulse train, 180 degree X-axis direct impulses and FIR are (fastSpeed saturated inversion recovers) pulse train. Oil sample is applied to DEFIR pulse train, can comprise: described oil sample is complied withInferior x described DE pulse train, described 180 degree X-axis direct impulses and y the described FIR pulse train of applying, wherein, x, yFor natural number, and x >=2, y >=2.

In oil sample, apply DEFIR pulse train, can be by by the magnetization vector of oil sample, switching is extremely repeatedlyAfter balance, calculate corresponding relaxation time data. The unique design of this pulse train and inversion method make its needs twice oneDimension scanning just can obtain T₁Distribute and two-dimentional T₁/T₂-T₁Distributed intelligence, has comprised calculating τ here_cNecessary T₁/T₂PointCloth and the required T using of calculating b₁Distribute.

Particularly, described oil sample is applied after DEFIR pulse train, can obtain T₁The first amplitude distributingA_DEFIR(lgT₁), then described oil sample is applied to y FIR pulse train successively, obtain echo-signal, to described echo letterNumber carry out inversion procedure, can obtain T₁The the second amplitude A distributing_FIR(lgT₁)。

According to described T₁The the first amplitude A distributing_DEFIR(lgT₁) and described T₁The the second amplitude A distributing_FIR(lgT₁) obtainT₁Distribution and the functional relation that T1/T2 distributes, be shown below:

$<\frac{T_1}{T_2}{>}_{T_1}=\frac{{\mathrm{\&tau;}}_1}{{\mathrm{\&tau;}}_2}\&lsqb;\frac{A_{FIR}\left(\lg T_1\right)-A_{DEFIR}\left(\lg T_1\right)}{A_{DEFIR}\left(1g{T}_1\right)}\&rsqb;---\left(4\right)$

In formula (4) < T₁/T₂>T₁Represent T₁Distribute and T₁/T₂The functional relation distributing. τ₁Represent x described DE pulse orderThe time interval in row between 90 of last DE pulse train degree X-axis negative-going pulses and described 180 degree X-axis direct impulses,τ₂＝4τ_DE，τ_DERepresent the time interval between adjacent two pulses in a described DE pulse train.

Obtaining T₁Distribute and T₁/T₂After the functional relation distributing, can be according to T₁Distribute and obtain T₁/T₂Distribute.

Step 205, according to described T₁/T₂Distribute and determine the reorientation time of oil molecule.

Step 206, according to the T of described reorientation time and oil molecule₁Oil molecule is determined in distribution¹H-¹H spacingDistribute.

Step 207, basis¹H-¹H spacing distributes and determines oil molecular structure.

Wherein, step 205 is to the step 102 in specific implementation principle and the embodiment mono-of step 207 to step 104 classSeemingly, repeat no more herein.

Adopt the present embodiment to detect two groups of oil sample, the oil of Fig. 6 for adopting the embodiment of the present invention two to provideThe T of two groups of oil sample that molecular structure detection method obtains₁/T₂Distribution map. The T of two groups of oil sample shown in Fig. 7 Fig. 6₁/T₂Corresponding reorientation time distribution map distributes. Fig. 8 is the correspondence that distributes the reorientation time of two groups of oil sample shown in Fig. 7B distribution map. As shown in Figure 8, according to the corresponding relation of molecular structure and b distribution, main in the oil sample on the left of can determiningThe hydrocarbon compound that contains 25 carbon left and right, and in the oil sample on right side, mainly contain the hydrocarbon compound about 32 carbon.

The oil molecular structure detection method that the present embodiment provides, by apply to oil sample DEFIR pulse train andFIR pulse train, only needs twice sweep just can obtain the two-dimentional relaxation information of oil sample, about half a minute, can recordThe two-dimentional relaxation information of an oil sample, can measure the T of crude oil sample quickly and accurately₁、T₂Information, then basisT₁/T₂Oil molecular structure is derived in distribution, and detection efficiency is high and result is accurate.

Embodiment tri-

The embodiment of the present invention three provides a kind of oil molecular structure checkout gear. Fig. 9 provides for the embodiment of the present invention threeThe structural representation of oil molecular structure checkout gear. As shown in Figure 9, the oil molecular structure checkout gear in the present embodiment,Can comprise:

Obtain module 301, for by oil sample is applied to pulse train, obtain the T of oil molecule₁/T₂Distribute;

The first determination module 302, for according to described T₁/T₂Distribute and determine the reorientation time of oil molecule;

The second determination module 303, for according to the T of described reorientation time and oil molecule₁Distribute and determine that oil dividesSon¹H-¹H spacing distributes;

The 3rd determination module 304, for basis¹H-¹H spacing distributes and determines oil molecular structure.

The oil molecular structure checkout gear that the present embodiment provides, can be for the oil molecule described in execution embodiment mono-Structure detection method, its specific implementation principle and embodiment mono-are similar, repeat no more herein.

The oil molecular structure checkout gear that the present embodiment provides, by oil sample is applied to pulse train, obtains stoneThe T of oil molecule₁/T₂Distribute, according to described T₁/T₂Distribute and determine the reorientation time of oil molecule, according to described reorientationThe T of time and oil molecule₁Oil molecule is determined in distribution¹H-¹H spacing distributes, and according to¹H-¹H spacing distributes and determines oilMolecular structure, can detect the structure of oil molecule rapidly, has improved the efficiency detecting, and simple to operate, does not need oilSample adds any chemical reagent, also can not pollute oil sample, and the scope of application is wider.

Further, described acquisition module 301 specifically for:

Described oil sample is applied to x DE pulse train, 180 degree X-axis direct impulse and y FIR pulses successivelySequence, obtains T₁The the first amplitude A distributing_DEFIR(lgT₁)；

Described oil sample is applied to y FIR pulse train successively, obtain echo-signal, described echo-signal is carried outInversion procedure, obtains T₁The the second amplitude A distributing_FIR(lgT₁)；

According to described T₁The the first amplitude A distributing_DEFIR(lgT₁) and described T₁The the second amplitude A distributing_FIR(lgT₁) obtainT₁Distribute and T₁/T₂The functional relation distributing;

According to T₁Distribute and T₁/T₂The functional relation distributing, determines T₁/T₂Distribute;

Wherein, x, y are natural number, and x >=2, y >=2.

Further, described the first determination module 302 specifically for:

Determine the described reorientation time according to following formula:

$\frac{T_1}{T_2}=\frac{1}{2}\frac{5{(1+{\mathrm{\&omega;}}^2{{\mathrm{\&tau;}}_c}^2)}^{-1}+2{(1+4{\mathrm{\&omega;}}^2{{\mathrm{\&tau;}}_c}^2)}^{-1}+3}{{(1+{\mathrm{\&omega;}}^2{{\mathrm{\&tau;}}_c}^2)}^{-1}+4{(1+4{\mathrm{\&omega;}}^2{{\mathrm{\&tau;}}_c}^2)}^{-1}}$

Wherein, τ_cFor orientation again, ω=2 π f, f is¹The Larmor frequency of H.

Further, described the second determination module 303 specifically for:

Described in determining according to following formula¹H-¹H spacing distributes:

Wherein, γ is magnetic conductivity,For Planck's constant is divided by 2 π, b be in molecule two adjacent¹H-¹Distance between HFrom, μ₀For space permeability.

Embodiment tetra-

The embodiment of the present invention four provides a kind of oil molecular structure detection system, comprises probe, spectrometer and above-mentioned arbitraryOil molecular structure checkout gear described in;

Wherein, described probe is for applying DEFIR pulse train and FIR pulse train to oil sample;

Described spectrometer is used for receiving echo-signal, and sends to described oil molecular structure to detect dress described echo-signalPut.

In the present embodiment, the 26S Proteasome Structure and Function of each parts is all similar with previous embodiment, repeats no more herein.

The oil molecular structure detection system that the present embodiment provides, by oil sample is applied to pulse train, obtains stoneThe T of oil molecule₁/T₂Distribute, according to described T₁/T₂Distribute and determine the reorientation time of oil molecule, according to described reorientationThe T of time and oil molecule₁Oil molecule is determined in distribution¹H-¹H spacing distributes, and according to¹H-¹H spacing distributes and determines oilMolecular structure, can detect the structure of oil molecule rapidly, has improved the efficiency detecting, and simple to operate, does not need oilSample adds any chemical reagent, also can not pollute oil sample, and the scope of application is wider.

Finally it should be noted that: above each embodiment, only in order to technical scheme of the present invention to be described, is not intended to limit; To the greatest extentPipe has been described in detail the present invention with reference to aforementioned each embodiment, and those of ordinary skill in the art is to be understood that: it is complied withThe technical scheme that so can record aforementioned each embodiment is modified, or some or all of technical characterictic is wherein enteredRow is equal to replacement; And these amendments or replacement do not make the essence of appropriate technical solution depart from various embodiments of the present invention technologyThe scope of scheme.

Claims (10)

1. an oil molecular structure detection method, is characterized in that, comprising:

By oil sample is applied to pulse train, obtain the T of oil molecule₁/T₂Distribute;

According to described T₁/T₂Distribute and determine the reorientation time of oil molecule;

According to the T of described reorientation time and oil molecule₁Oil molecule is determined in distribution¹H-¹H spacing distributes;

According to¹H-¹H spacing distributes and determines oil molecular structure.

2. method according to claim 1, is characterized in that, by oil sample is applied to pulse train, obtains oilThe T of molecule₁/T₂Distribute, specifically comprise:

Described oil sample is applied to x DE pulse train, 180 degree X-axis direct impulse and y FIR pulse trains successively,Obtain T₁The the first amplitude A distributing_DEFIR(lgT₁)；

Described oil sample is applied to y FIR pulse train successively, obtain echo-signal, described echo-signal is carried out to invertingProcess, obtain T₁The the second amplitude A distributing_FIR(lgT₁)；

According to described T₁The the first amplitude A distributing_DEFIR(lgT₁) and described T₁The the second amplitude A distributing_FIR(lgT₁) acquisition T₁DistributeWith T₁/T₂The functional relation distributing;

According to T₁Distribute and T₁/T₂The functional relation distributing, determines T₁/T₂Distribute;

Wherein, x, y are natural number, and x >=2, y >=2.

3. method according to claim 1, is characterized in that, according to described T₁/T₂Distribute and determine again getting of oil moleculeTo the time, specifically comprise:

Determine the described reorientation time according to following formula:

$\frac{T_1}{T_2}=\frac{1}{2}\frac{5{(1+{\mathrm{\&omega;}}^2{{\mathrm{\&tau;}}_c}^2)}^{-1}+2{(1+4{\mathrm{\&omega;}}^2{{\mathrm{\&tau;}}_c}^2)}^{-1}+3}{{(1+{\mathrm{\&omega;}}^2{{\mathrm{\&tau;}}_c}^2)}^{-1}+4{(1+4{\mathrm{\&omega;}}^2{{\mathrm{\&tau;}}_c}^2)}^{-1}}$

Wherein, τ_cFor orientation again, ω=2 π f, f is¹The Larmor frequency of H.

4. method according to claim 1, is characterized in that, according to the T of described reorientation time and oil molecule₁PointCloth is determined oil molecule¹H-¹H spacing distributes, and specifically comprises:

Described in determining according to following formula¹H-¹H spacing distributes:

Wherein, γ is magnetic conductivity,For Planck's constant is divided by 2 π, b be in molecule two adjacent¹H-¹Distance between H, μ₀ForSpace permeability.

5. according to the method described in claim 1-4 any one, it is characterized in that, according to¹H-¹H spacing distributes and determines oil moleculeStructure, specifically comprises:

According to the molecular structure of pre-stored with¹H-¹The corresponding relation that H spacing distributes, determines the molecular structure of oil sample.

6. an oil molecular structure checkout gear, is characterized in that, comprising:

Obtain module, for by oil sample is applied to pulse train, obtain the T of oil molecule₁/T₂Distribute;

The first determination module, for according to described T₁/T₂Distribute and determine the reorientation time of oil molecule;

The second determination module, for according to the T of described reorientation time and oil molecule₁Oil molecule is determined in distribution¹H-¹HSpacing distributes;

The 3rd determination module, for basis¹H-¹H spacing distributes and determines oil molecular structure.

7. device according to claim 6, is characterized in that, described acquisition module specifically for:

Described oil sample is applied to x DE pulse train, 180 degree X-axis direct impulse and y FIR pulse trains successively,Obtain T₁The the first amplitude A distributing_DEFIR(lgT₁)；

Described oil sample is applied to y FIR pulse train successively, obtain echo-signal, described echo-signal is carried out to invertingProcess, obtain T₁The the second amplitude A distributing_FIR(lgT₁)；

According to described T₁The the first amplitude A distributing_DEFIR(lgT₁) and described T₁The the second amplitude A distributing_FIR(lgT₁) acquisition T₁DistributeWith T₁/T₂The functional relation distributing;

According to T₁Distribute and T₁/T₂The functional relation distributing, determines T₁/T₂Distribute;

Wherein, x, y are natural number, and x >=2, y >=2.

8. device according to claim 6, is characterized in that, described the first determination module specifically for:

Determine the described reorientation time according to following formula:

$\frac{T_1}{T_2}=\frac{1}{2}\frac{5{(1+{\mathrm{\&omega;}}^2{{\mathrm{\&tau;}}_c}^2)}^{-1}+2{(1+4{\mathrm{\&omega;}}^2{{\mathrm{\&tau;}}_c}^2)}^{-1}+3}{{(1+{\mathrm{\&omega;}}^2{{\mathrm{\&tau;}}_c}^2)}^{-1}+4{(1+4{\mathrm{\&omega;}}^2{{\mathrm{\&tau;}}_c}^2)}^{-1}}$

Wherein, τ_cFor orientation again, ω=2 π f, f is¹The Larmor frequency of H.

9. according to the device described in claim 6-8 any one, it is characterized in that, described the second determination module specifically for:

Described in determining according to following formula¹H-¹H spacing distributes:

Wherein, γ is magnetic conductivity,For Planck's constant is divided by 2 π, b be in molecule two adjacent¹H-¹Distance between H, μ₀ForSpace permeability.

10. an oil molecular structure detection system, is characterized in that, comprises probe, spectrometer and claim 6-9 any oneDescribed oil molecular structure checkout gear;

Wherein, described probe is for applying DEFIR pulse train and FIR pulse train to oil sample;

Described spectrometer is used for receiving echo-signal, and described echo-signal is sent to described oil molecular structure checkout gear.