CN106324008B - Method for correcting nuclear magnetic resonance logging spectrum - Google Patents
Method for correcting nuclear magnetic resonance logging spectrum Download PDFInfo
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- 238000001228 spectrum Methods 0.000 title claims abstract description 115
- 238000005481 NMR spectroscopy Methods 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 133
- 239000011148 porous material Substances 0.000 claims abstract description 114
- 238000000655 nuclear magnetic resonance spectrum Methods 0.000 claims abstract description 96
- 230000007935 neutral effect Effects 0.000 claims abstract description 91
- 238000012937 correction Methods 0.000 claims abstract description 15
- 238000005553 drilling Methods 0.000 claims description 39
- 238000007789 sealing Methods 0.000 claims description 39
- 238000005406 washing Methods 0.000 claims description 36
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims description 25
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Abstract
The invention provides a method for correcting a nuclear magnetic resonance logging spectrum. The correction method comprises the following steps: step S1, dividing the nuclear magnetic resonance spectrum of the neutral reservoir into a water-containing spectrum and an oil-containing spectrum by adopting a nuclear magnetic resonance spectrum separation model; step S2, calculating the water surface relaxation rate and the oil surface relaxation rate of the pores of the neutral reservoir by adopting a surface relaxation rate calculation model; step S3, calculating the pore throat radius distribution of the oil-containing part of the neutral reservoir by using the oil surface relaxation rate; step S4, correcting the pore throat radius distribution of the oil-containing part according to the water surface relaxation rate to obtain a nuclear magnetic resonance spectrum of saturated water of the oil-containing part of the corrected neutral reservoir; and step S5, superposing the water spectrum and the corrected nuclear magnetic resonance spectrum of the saturated water of the oil-containing part to obtain the corrected nuclear magnetic resonance spectrum of the saturated water of the neutral reservoir. The correction method can obtain accurate nuclear magnetic resonance spectrum of saturated water of the neutral reservoir, and further can accurately analyze the neutral reservoir.
Description
Technical field
The present invention relates to oil fields, in particular to a kind of bearing calibration of nuclear magnetic resonance log wave spectrum.
Background technology
Petroleum industry passes through the development of over half a century, and the target of exploration and development becomes increasingly complex, the infiltration of reservoir
Rate is lower and lower, hyposmosis at present with fine and close oily reservoir be or will be exploration and development major heading, such reservoir comments
One of core content of valence is exactly pore structure evaluation, and existing pore structure assessment technique mainly applies nuclear magnetic resonance log,
When the NMR relaxation mechanism of fluid in pore media is Volume Relaxation, the Response Mechanism of NMR spectrum is as follows：
Wherein, T1,2For NMR relaxation time, ρ1,2For the surface relaxivity of rock, S is the surface area of hole, and V is
The volume of hole.The model is the evaluation model of most physical significance, but it is reservoir containing only single to apply the premise of the model
Pore-fluid.Subsequent countries in the world well log interpretation expert proposes the evaluation model of some series, before the application of these models
It is for hydrophilic reservoir to carry, and nuclear magnetic resonance log is influenced to want small by oily.
Most of conventional reservoir is hydrophilic rock at present, and the reservoir in nuclear magnetic resonance log investigative range is because by mud
The influence of intrusion is starched, residual oil saturation is low, and nuclear magnetic resonance log at this time is influenced very faint, response spy by oiliness
Sign is single fluid, i.e. the nuclear magnetic resonance of water, and at this moment above-mentioned model can be used for evaluating the pore throat radius distribution of reservoir.
But for the reservoir of neutral wetting, such as fine and close oily reservoir, oil saturation is higher, and pore throat radius
It is small, mud be difficult to reservoir carry out displacement, nuclear magnetic resonance log is big by the effect of signals of crude oil, at this moment using existing method come
The pore throat radius distribution of the fine and close oily reservoir of analysis calculating has the great error of generation.
Analysis method in the prior art does not fully take into account influence of the neutral reservoir oiliness to nuclear magnetic resonance log,
If being difficult to correctly characterize the pore throat radius of neutral reservoir without carrying out oiliness correction to the nuclear magnetic resonance log wave spectrum of reservoir
Distribution, therefore, it is necessary to a kind of methods of nuclear magnetic resonance log wave spectrum oil gas correction.
Invention content
The main purpose of the present invention is to provide a kind of bearing calibrations of nuclear magnetic resonance log wave spectrum, to solve the prior art
In the NMR spectrum of water the problem of cannot accurately analyzing the distribution of neutral reservoir pore throat radius.
To achieve the goals above, according to an aspect of the invention, there is provided a kind of school of nuclear magnetic resonance log wave spectrum
Correction method, above-mentioned bearing calibration include：Step S1, using NMR spectrum disjunctive model by the nuclear magnetic resonance wave of neutral reservoir
Spectrum is divided into aqueous spectrum and is composed with oil-containing；Step S2 calculates the water of the hole of above-mentioned neutral reservoir using surface relaxivity computation model
Surface relaxivity and oil meter face relaxation rate；Step S3 calculates the oil-containing portion of above-mentioned neutral reservoir using above-mentioned oil meter face relaxation rate
The pore throat radius distribution divided；Step S4 is distributed the pore throat radius of above-mentioned oil-containing part according to above-mentioned water surface relaxation rate and carries out
Correction, the NMR spectrum for being full of water of the oil-containing part of the above-mentioned neutral reservoir after being corrected；And step S5, to upper
It states aqueous spectrum and the NMR spectrum for being full of water of the oil-containing part of above-mentioned correction is overlapped, after being corrected among the above
The NMR spectrum for being full of water of property reservoir.
Further, above-mentioned NMR spectrum disjunctive model is：T1w,2w∪T1o,2o=T1,2(1), in formula (1)：T1,2For
The NMR spectrum of above-mentioned neutrality reservoir；T1w,2wFor the aqueous spectrum of above-mentioned neutral reservoir；T1o,2oFor containing for above-mentioned neutral reservoir
Oil spectrum.
Further, above-mentioned steps S2 includes：
Step A chooses coring sample, measures the nuclear-magnetism for being full of water after the NMR spectrum of above-mentioned coring sample, washing oil
Resonance wave spectrum and total pore throat radius of above-mentioned neutral reservoir are distributed；
Step B is counted according to the NMR spectrum and capillary pressure curve for being full of water after above-mentioned washing oil using formula (2)
It counts in stating water surface relaxation rate, above-mentioned formula (2) is：In above-mentioned formula (2)：ρwFor above-mentioned water surface
Relaxation rate, θ are the contact angle of mercury, and γ is the surface tension of mercury, PtotalFor capillary pressure, T1tw,2twFor being full of after above-mentioned washing oil
The nuclear magnetic resonance lateral relaxation time T of water2twOr longitudinal relaxation time T1tw, unit ms；
The NMR spectrum for being full of grease of above-mentioned coring sample is divided into the aqueous spectrum of coring sample and coring by step C
Sample oil-containing is composed；
Step D calculates above-mentioned coring according to above-mentioned water surface relaxation rate and the above-mentioned aqueous spectrum of coring sample using formula (3)
The pore throat radius distribution containing water section of sample, above-mentioned formula (3) are：rw=a × ρw×T1w,2wIn above-mentioned formula (3)：rwIt is taken to be above-mentioned
The pore throat radius distribution containing water section of heart sample, ρwFor above-mentioned water surface relaxation rate, a is constant, when above-mentioned pore shape point
Not Wei cylindrical, spherical, shape channel-shaped when, a is respectively 2,3,1, T1w,2wFor the lateral relaxation time of the above-mentioned aqueous spectrum of coring sample
T2wOr longitudinal relaxation time T1w；
Step E is distributed according to above-mentioned total pore throat radius distribution and the pore throat radius containing water section of above-mentioned coring sample, adopts
The pore throat radius distribution of the oil-containing part of above-mentioned coring sample is calculated with formula (4), above-mentioned formula (4) isAbove-mentioned formula
(4) in, roFor the pore throat radius distribution of the oil-containing part of above-mentioned coring sample, rwFor the hole containing water section of above-mentioned coring sample
Larynx radius distribution, rtotalIt is distributed for above-mentioned total pore throat radius；
Step F is composed according to the distribution of the pore throat radius of the oil-containing part of above-mentioned coring sample and the oil-containing of above-mentioned coring sample,
Above-mentioned oil meter face relaxation rate is calculated using formula (5), above-mentioned formula (5) isIn above-mentioned formula (5), ρoIt is above-mentioned
Oil meter face relaxation rate；θ is the contact angle of above-mentioned mercury, and γ is the surface tension of above-mentioned mercury, and a is constant, when above-mentioned pore shape point
Not Wei cylindrical, spherical, shape channel-shaped when, a is respectively 2,3,1, PoFor the corresponding hair in aperture of above-mentioned neutral reservoir oil-containing part
Pipe pressure is calculated, T according to the distribution of the pore throat radius of the oil-containing part of above-mentioned coring sample1o,2oFor the cross of above-mentioned oil-containing spectrum
To relaxation time T2oOr longitudinal relaxation time T1o。
Further, above-mentioned steps A includes：Sealing core drilling sample is chosen, the nuclear-magnetism for measuring above-mentioned sealing core drilling sample is total
Vibration wave is composed；Washing oil is carried out to above-mentioned sealing core drilling sample, measures the nuclear magnetic resonance for being full of water of the above-mentioned coring sample after washing oil
Wave spectrum；And pressure mercury experiment is carried out to above-mentioned sealing core drilling sample, obtain above-mentioned total pore throat radius distribution.
Further, above-mentioned steps A includes：Non- sealing core drilling sample is chosen, above-mentioned non-sealing core drilling sample is washed
Oil measures the NMR spectrum for being full of water of the above-mentioned non-sealing core drilling sample after washing oil；To above-mentioned non-after above-mentioned washing oil
Sealing core drilling sample carries out pressure mercury experiment, obtains above-mentioned total pore throat radius distribution；And above-mentioned non-sealing core drilling sample is carried out
Core Location, using practical logging NMR spectrum as the NMR spectrum of above-mentioned non-sealing core drilling sample.
Further, above-mentioned core Location is the core Location of Centimeter Level.
It further, the nuclear magnetic resonance time corresponding to based on crude preservation lower limiting value, will be above-mentioned in above-mentioned steps C
The NMR spectrum of coring sample is divided into the aqueous spectrum of coring sample and is composed with coring sample oil-containing.
Further, above-mentioned steps S3 includes according to the above-mentioned oil-containing in above-mentioned oil meter face relaxation rate and above-mentioned steps S1
Spectrum, the pore throat radius that above-mentioned neutral reservoir oil-containing part is calculated using formula (6) are distributed, and above-mentioned formula (6) is：Ro=a × ρo×
T1o,2o, in above-mentioned formula (6), RoFor the pore throat radius distribution of above-mentioned neutral reservoir oil-containing part；ρoFor above-mentioned oil meter face relaxation rate；
A is constant, and 2 are taken when above-mentioned pore shape is cylindrical, takes 3 when being spherical, 1 is taken when being channel-shaped；T1o,2oIt is composed for above-mentioned oil-containing
Lateral relaxation time T2oOr longitudinal relaxation time T1o。
Further, in above-mentioned steps S4, according to above-mentioned water surface relaxation rate, using formula (7) to above-mentioned neutral reservoir
The pore throat radius distribution of oil-containing part is corrected, and obtains the nuclear magnetic resonance wave for being full of water of above-mentioned neutral reservoir oil-containing part
Spectrum, above-mentioned formula (7) is,In above-mentioned formula (7), T1jw,2jwIt is full of water for above-mentioned neutral reservoir oil-containing part
NMR spectrum；RoFor the pore throat radius distribution of the oil-containing part of above-mentioned coring sample；ρwFor above-mentioned water surface relaxation rate；a
For constant, when above-mentioned pore shape is respectively cylinder, spherical shape, shape channel-shaped, a is respectively 2,3,1.
Further, in above-mentioned steps S5, using formula (8) by above-mentioned steps S1 it is above-mentioned it is aqueous spectrum with above-mentioned neutrality
The NMR spectrum for being full of water of reservoir oil-containing part is overlapped, and obtains the nuclear magnetic resonance wave that above-mentioned neutral reservoir is full of water
Spectrum, above-mentioned formula (8) is T1tw,2tw=T1w,2w∪T1jw,2jw, in above-mentioned formula (8), T1tw,2twIt is full of the core of water for above-mentioned neutral reservoir
Magnetic Resonance Spectrum；T1w,2wFor above-mentioned aqueous spectrum；T1jw,2jwFor the nuclear magnetic resonance wave for being full of water of above-mentioned neutral reservoir oil-containing part
Spectrum.
Using the bearing calibration of the present invention, influence of the oiliness to nuclear magnetic resonance log of neutral reservoir has been fully considered,
Hole using the oil-containing part of neutral reservoir is full of water NMR spectrum, is corrected to the aqueous spectrum of neutral reservoir, school
Wave spectrum after just is the NMR spectrum for being full of water of neutral reservoir, which can correctly characterize the pore throat half of neutral reservoir
Diameter is distributed so that those skilled in the art can accurately analyze neutral reservoir, and then carry out rational exploration and development, have
Conducive to the development of petroleum industry.
Description of the drawings
The accompanying drawings which form a part of this application are used to provide further understanding of the present invention, and of the invention shows
Meaning property embodiment and its explanation are not constituted improper limitations of the present invention for explaining the present invention.In the accompanying drawings：
Fig. 1 shows a kind of flow signal of the bearing calibration for the nuclear magnetic resonance log wave spectrum that exemplary embodiment provides
Figure；
Fig. 2 shows a kind of nuclear magnetic resonance T for being full of water-oil phase of preferred embodiment reservoir2It is full of after wave spectrum and washing oil
The NMR spectrum comparison diagram of water；
Fig. 3 shows that a well sealing core drilling well section that a kind of preferred embodiment of the application provides changes using different AT values
The Analysis of Mean Square Error figure that generation calculates；
Fig. 4 a show the NMR spectrum for being full of water-oil phase that a kind of preferred embodiment provides be separated into water spectrum with
The schematic diagram of oil spectrum；
Fig. 4 b show the schematic diagram for the aqueous spectrum that the NMR spectrum from Fig. 4 a is isolated；
Fig. 4 c show the schematic diagram for the oil-containing spectrum that the NMR spectrum from Fig. 4 a is isolated；
Fig. 5 a show a kind of capillary pressure curve that preferred embodiment provides；
The NMR spectrum capillary pressure curve of water is provided after the washing oil provided Figure 5b shows that a kind of preferred embodiment；
Fig. 5 c show the NMR spectrum capillary pressure curve for being full of water after the washing oil that a kind of preferred embodiment provides；
Fig. 6 a show a kind of aqueous spectrum for the coring sample that preferred embodiment provides；
Fig. 6 b show a kind of pore throat radius distribution containing water section for the coring sample that preferred embodiment provides；
Fig. 7 a show a kind of total pore throat radius distribution schematic diagram that preferred embodiment provides；
Fig. 7 b show that a kind of preferred embodiment provides aqueous pore throat radius distribution schematic diagram；
Fig. 7 c show a kind of pore throat radius for the oil-containing part obtained according to Fig. 7 a and Fig. 7 b that preferred embodiment provides
Distribution schematic diagram；
Fig. 8 shows the test result figure that a kind of preferred embodiment of the application provides；And
Fig. 9 shows the 5th some depth point of region in Fig. 8, corrects to obtain completely aqueous spectrum meter using by oiliness
The pore throat radius distribution curve comparison diagram that the throat distribution feature of calculation is obtained with experiment.
Specific implementation mode
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
This application provides a kind of bearing calibrations of nuclear magnetic resonance log wave spectrum, as shown in Figure 1, the bearing calibration includes：
The NMR spectrum of neutral reservoir is divided into aqueous spectrum using NMR spectrum disjunctive model and is composed with oil-containing by step S1；Step
Rapid S2 calculates the water surface relaxation rate and oil meter face relaxation of the hole of above-mentioned neutral reservoir using surface relaxivity computation model
Rate；Step S3, the pore throat radius that the oil-containing part of above-mentioned neutral reservoir is calculated using above-mentioned oil meter face relaxation rate are distributed；Step
S4 is corrected the pore throat radius distribution of above-mentioned oil-containing part according to above-mentioned water surface relaxation rate, above-mentioned after being corrected
The NMR spectrum for being full of water of the oil-containing part of neutral reservoir；And step S5, to above-mentioned aqueous spectrum and above-mentioned correction
The NMR spectrum for being full of water of oil-containing part is overlapped, the nuclear-magnetism for being full of water of the above-mentioned neutral reservoir after being corrected
Resonate wave spectrum.All steps are the core samples for coring section in above-mentioned steps S2, and above-mentioned steps S3, S4 and S5 are to be directed to
The practical NMR spectrum measured in non-coring section underground.
Above-mentioned bearing calibration has fully considered influence of the oiliness to nuclear magnetic resonance log of neutral reservoir, using neutrality
The hole of the oil-containing part of reservoir is full of water NMR spectrum, is corrected to the aqueous spectrum of neutral reservoir, the wave after correction
Spectrum is the NMR spectrum for being full of water of neutral reservoir, which can correctly characterize the pore throat radius distribution of neutral reservoir,
Those skilled in the art accurately analyze neutral reservoir, and then carry out rational exploration and development, are conducive to stone
Oily industrial expansion.
It is composed with oil-containing in order to which the NMR spectrum of neutral reservoir is more accurately divided into aqueous spectrum, the application is preferred
Above-mentioned NMR spectrum disjunctive model is：
In formula (1), T1,2For the NMR spectrum of above-mentioned neutral reservoir；T1w,2wFor the aqueous spectrum of above-mentioned neutral reservoir；
T1o,2oFor the oil-containing spectrum of above-mentioned neutral reservoir.
NMR spectrum can be longitudinal relaxation time (T1) spectrum, can also be lateral relaxation time (T2) spectrum.For oil
The disjunctive model of water spectrum is exactly by finding a NMR relaxation time point (T1With T2), which corresponds to former
The lower limiting value of oily preservation.The wave spectrum on the nuclear magnetic resonance time point left side (being less than the time) is aqueous spectrum, and rock is mainly
Hydrophilic rock；The wave spectrum at the nuclear magnetic resonance time point (being more than the time) is composed for oil-containing, and rock is oil-wet rock, on the whole
Rock shows as neutral wetting.The NMR relaxation time point can be calculated using grease characteristic nmr difference,
The corresponding NMR relaxation time value of reservoir crude oil minimum filling radius determines when can also be applied to Tibetan, can also be by two kinds of sides
Method, which combines, to be determined.
In another preferred embodiment of the application, above-mentioned steps S2 includes：
Step A chooses coring sample, measures the nuclear-magnetism for being full of water after the NMR spectrum of above-mentioned coring sample, washing oil
Resonance wave spectrum and total pore throat radius of above-mentioned neutral reservoir are distributed；
Step B is counted according to the NMR spectrum and capillary pressure curve for being full of water after above-mentioned washing oil using formula (2)
It counts in stating water surface relaxation rate, above-mentioned formula (2) is：
In formula (2), ρwFor above-mentioned water surface relaxation rate, unit 10-3μm/ms, θ is the contact angle of mercury, and γ is the table of mercury
Face tension, unit psicm, PtotalFor capillary pressure, unit MPa, T1tw,2twFor the core for being full of water after above-mentioned washing oil
Magnetic resonance lateral relaxation time (T2tw) or longitudinal relaxation time (T1tw), unit ms；
The NMR spectrum for being full of grease of above-mentioned coring sample is divided into the aqueous spectrum of coring sample and coring by step C
Sample oil-containing is composed；
Step D calculates above-mentioned coring according to above-mentioned water surface relaxation rate and the above-mentioned aqueous spectrum of coring sample using formula (3)
The pore throat radius distribution containing water section of sample, above-mentioned formula (3) are：
rw=a × ρw×T1w,2w……………….(3)
In above-mentioned formula (3), rwThe pore throat radius distribution containing water section that is above-mentioned coring sample, unit are μm ρwIt is above-mentioned
Water surface relaxation rate, unit 10-3μm/ms, and a is constant, when above-mentioned pore shape is respectively cylinder, spherical shape, shape channel-shaped,
A is respectively 2,3,1, T1w,2wFor the lateral relaxation time (T of the above-mentioned aqueous spectrum of coring sample2w) or longitudinal relaxation time (T1w), it is single
Position is ms；
Step E is distributed according to above-mentioned total pore throat radius distribution and the pore throat radius containing water section of above-mentioned coring sample, adopts
The pore throat radius distribution of the oil-containing part of above-mentioned coring sample is calculated with formula (4), above-mentioned formula (4) is：
In above-mentioned formula (4)：roFor the pore throat radius distribution of the oil-containing part of above-mentioned coring sample, rwFor above-mentioned coring sample
The pore throat radius containing water section point, rtotalIt is distributed for above-mentioned total pore throat radius；
Step F is composed according to the distribution of the pore throat radius of the oil-containing part of above-mentioned coring sample and the oil-containing of above-mentioned coring sample,
Above-mentioned oil meter face relaxation rate is calculated using formula (5), calculation formula is：
In above-mentioned formula (5)：ρoFor above-mentioned oil meter face relaxation rate, unit 10-3μm/ms；θ is the contact angle of above-mentioned mercury, single
Position for °, γ is the surface tension of above-mentioned mercury, and unit psicm, a are constant, when above-mentioned pore shape be respectively it is cylindrical,
When spherical shape, shape channel-shaped, a is respectively 2,3,1, PoFor the corresponding capillary pressure in aperture of above-mentioned neutral reservoir oil-containing part, according to
The pore throat radius distribution of the oil-containing part of above-mentioned coring sample is calculated, unit MPa, T1o,2oFor the transverse direction of above-mentioned oil-containing spectrum
Relaxation time (T2o) or longitudinal relaxation time (T1o), unit ms.
It adopts with the aforedescribed process, is capable of the water surface relaxation rate and oil meter of the more accurately hole of calculated neutral reservoir
Face relaxation rate further ensures the accuracy of the bearing calibration.
In order to further obtain being full of the nuclear magnetic resonance of water after the NMR spectrum of accurate above-mentioned coring sample, washing oil
Total pore throat radius of wave spectrum and above-mentioned neutral reservoir is distributed, and those skilled in the art can choose sealing core drilling according to actual conditions
Sample is tested with non-sealing core drilling sample.
When sample is sealing core drilling sample, above-mentioned steps A includes：Sealing core drilling sample is chosen, above-mentioned closed take is measured
The NMR spectrum of heart sample；Washing oil is carried out to above-mentioned sealing core drilling sample, measures the full of the above-mentioned coring sample after washing oil
Aqueous NMR spectrum；And pressure mercury experiment is carried out to above-mentioned sealing core drilling sample, obtain above-mentioned total pore throat radius distribution.
When sample is non-sealing core drilling sample, above-mentioned steps A includes：Non- sealing core drilling sample is chosen, to above-mentioned non-close
It closes coring sample and carries out washing oil, measure the NMR spectrum for being full of water of the above-mentioned non-sealing core drilling sample after washing oil；To upper
It states the above-mentioned non-sealing core drilling sample after washing oil and carries out pressure mercury experiment, obtain above-mentioned total pore throat radius distribution；And to above-mentioned non-
Sealing core drilling sample carries out core Location, is total to practical logging NMR spectrum as the nuclear-magnetism of above-mentioned non-sealing core drilling sample
Vibration wave is composed.
In another preferred embodiment of the application, above-mentioned core Location is the core Location of Centimeter Level, in this way can
The work of true layer into where restoring rock core, and then further can accurately obtain the nuclear magnetic resonance for being full of grease of coring sample
Wave spectrum.
It, can be more quickly by the core of coring sample in order to improve the efficiency for the NMR spectrum for detaching coring sample
The efficiency of Magnetic Resonance Spectrum is divided into the aqueous spectrum of coring sample and is composed with coring sample oil-containing, preferably in above-mentioned steps C, based on crude
The NMR spectrum of above-mentioned coring sample is divided into the aqueous spectrum of coring sample by the nuclear magnetic resonance time corresponding to preservation lower limiting value
It is composed with coring sample oil-containing.
In another preferred embodiment of the application, above-mentioned steps S3 includes：
It is composed according to the above-mentioned oil-containing in above-mentioned oil meter face relaxation rate and above-mentioned steps S1, above-mentioned neutrality is calculated using formula (6)
The pore throat radius of reservoir oil-containing part is distributed, and above-mentioned formula (6) is：
Ro=a × ρo×T1o,2o……………….(6)
In above-mentioned formula (6)：RoFor the pore throat radius distribution of above-mentioned neutral reservoir oil-containing part, unit is μm；ρoFor above-mentioned oil
Surface relaxivity, unit 10-3μm/ms；A is constant, and 2 are taken when above-mentioned pore shape is cylindrical, takes 3 when being spherical, is
1 is taken when channel-shaped；T1o,2oFor the lateral relaxation time (T of above-mentioned oil-containing spectrum2o) or longitudinal relaxation time (T1o), unit ms.
In order to further accurately obtain the NMR spectrum for being full of water of above-mentioned neutral reservoir oil-containing part, in above-mentioned step
In rapid S4, according to above-mentioned water surface relaxation rate, the pore throat radius of above-mentioned neutral reservoir oil-containing part is distributed using formula (7) and is carried out
Correction, obtains the NMR spectrum for being full of water of above-mentioned neutral reservoir oil-containing part, and above-mentioned formula (7) is：
In above-mentioned formula (7), T1jw,2jwFor the NMR spectrum for being full of water of above-mentioned neutral reservoir oil-containing part；RoIt is upper
The pore throat radius distribution of the oil-containing part of coring sample is stated, unit is μm；ρwFor above-mentioned water surface relaxation rate, unit 10-3μm/
ms；A is constant, and when above-mentioned pore shape is respectively cylinder, spherical shape, shape channel-shaped, a is respectively 2,3,1.
It, will be upper in above-mentioned steps S1 using formula (8) in above-mentioned steps S5 in another preferred embodiment of the application
It states aqueous spectrum and the NMR spectrum for being full of water of above-mentioned neutral reservoir oil-containing part is overlapped, obtain above-mentioned neutral reservoir
It is full of the NMR spectrum of water, above-mentioned formula (8) is：
T1tw,2tw=T1w,2w∪T1jw,2jw……………….(8)
In above-mentioned formula (8), T1tw,2twIt is full of the NMR spectrum of water for above-mentioned neutral reservoir；T1w,2wIt is above-mentioned aqueous
Spectrum；T1jw,2jwFor the NMR spectrum for being full of water of above-mentioned neutral reservoir oil-containing part.
In order to enable those skilled in the art clearly to understand the technical solution of the application, below with reference to implementation
Example is described in detail with attached drawing.
Some fine and close oilfield of the selection Junggar Basin Permian System, the reservoir of the densification oilfield is salified lacustrine environment
Fine-grained sediment, principal lithologic are clastic rock and carbonate rock transitionality rock class.The porosity of reservoir covers pressure between 6~16%
Permeability is generally less than 0.1md, and for the diameter of reservoir pore space based on nanoscale, the oily saturation degree of reservoir is higher, average 70%
Left and right, wetability the experimental results showed that：Reservoir wettability is mainly typical fine and close oily reservoir based on neutral wetting.Exploration
Initial stage does not consider influence of the crude oil to nuclear magnetic resonance log, is directly evaluated using routine evaluations method, result show hole
Larynx radius is bigger than normal, and distribution characteristics is similar to conventional reservoir, is unable to meet production the technology requirement of fine and close oily pore throat radius characterization.
Influence of the crude oil to nuclear magnetic resonance log has been fully considered according to technical solution provided by the invention, using oil-containing portion
The hole divided is full of water NMR spectrum and is corrected to the aqueous spectrum of reservoir, and specific flow is divided into five steps, respectively
For：
The first step, the petrophysics experiment of application system establish the water-oil separating mould of the NMR spectrum of area's reservoir
The NMR spectrum of reservoir is divided into aqueous spectrum and is composed with oil-containing by type.
Choose polylith sealing core drilling sample, carry out reservoir be full of water-oil phase nuclear magnetic resonance (i.e. reservoir nuclear-magnetism be total to
Vibration wave is composed) experiment, after measuring its oil saturation, then sample is cleaned, measures the NMR spectrum that sample is full of water.
The lateral relaxation time spectrum that this research area is all made of, so the NMR spectrum in this example is T2Spectrum.
The experimental results showed that as shown in Fig. 2, the nuclear magnetic resonance T for being full of water-oil phase of reservoir2It is full of after wave spectrum and washing oil
The NMR spectrum of water is compared, and reservoir is full of the nuclear magnetic resonance T of water-oil phase2Wave spectrum is longer, and then demonstrates crude oil to T2Spectrum
Large effect can be generated.
Utilize oil saturation analysis data and nuclear magnetic resonance T2Spectral data binding analysis analyzes different time to count meters
Relative error between the oil saturation that the oil saturation of calculation and experiment obtain, time to count when relative error minimum is just
For the disengaging time of NMR spectrum water-oil separating model, i.e. lateral relaxation time threshold value.
Specifically determining the disengaging time of NMR spectrum water-oil separating model using iterative method, root mean square is calculated
T2 values when error minimum are threshold value A T2, and calculation formula is as follows：
Wherein, WT2 (j) is that the side of j-th of iteration T2 threshold value calculates error, and n is of oil saturation experimental data
Number, SOi are the saturation degree measurement data of i-th of sampling point, SSOjiFor i-th of calculating saturation degree of j-th of iteration T2 threshold value, meter
It is as follows to calculate formula：
Wherein, AT (j) is that oil saturation starts nuclear magnetic resonance lateral relaxation time, unit ms；ATS is active porosity
The nuclear magnetic resonance transverse relaxation time to count of degree；ATD is that the nuclear magnetic resonance transverse relaxation of effecive porosity terminates the time.
Error analysis the result shows that, as shown in figure 3, when time to count is 6ms, oil-containing oil saturation degree error is minimum, because
This, using 6ms as the disengaging time of oil spectrum and water spectrum in reservoir NMR spectrum as shown in fig. 4 a, i.e., under crude oil preservation
Time value is limited, the separation of aqueous spectrum and oil-containing spectrum can be completed with the value, obtains Fig. 4 b aqueous spectrum and Fig. 4 c institutes with shown in
The oil-containing spectrum shown.
Second, the petrophysics experiment of application system establishes the computation model of surface relaxivity respectively, calculates neutral reservoir
Hole water surface relaxation rate and surface relaxivity of the oil meter face relaxation rate Liao Gai area's reservoirs containing water voids and oil-containing hole table
Face relaxation rate computation model.
Step A obtains the T for being full of water-oil phase of sealing core drilling sample2It composes, the nuclear magnetic resonance T of water is full of after washing oil2Spectrum
It is distributed with total pore throat radius.
Water surface relaxation rate is the surface relaxivity containing water voids, and oil meter face relaxation rate is oil-containing pore surface relaxation rate.
In order to establish water surface relaxation rate and computation model containing surface relaxivity, the whole district has selected the representational sealing core drilling sample of polylith
Product, successively carried out sealing core drilling sample is full of the nuclear magnetic resonance wave for being full of water after water-oil phase Nuclear Magnetic Resonance Measurement, washing oil
Spectrometry and high-pressure mercury experiment, obtain the T for being full of water-oil phase of sealing core drilling sample2It composes, the core of water is full of after washing oil
Magnetic resonance T2Spectrum is distributed with total pore throat radius.
For the depth segment of not sealing core drilling, washing oil first is carried out to non-closed sample, measures being full of after obtaining washing oil
The nuclear magnetic resonance T of water2Spectrum；Then, after carrying out pressure mercury translocation experiment, total pore throat radius distribution is obtained；Finally to non-sealing core drilling
Sample carries out the core Location of Centimeter Level, obtains real well and corresponds to the nuclear magnetic resonance log of depth and compose, as being full of grease
The T of two-phase2Spectrum.
Step B calculates above-mentioned water meter according to the NMR spectrum and capillary pressure curve for being full of water after above-mentioned washing oil
Face relaxation rate.
Calculating process after the washing oil of the capillary pressure curve and Fig. 5 b of Fig. 5 a as shown in figure 5, be full of the nuclear magnetic resonance of water
When wave spectrum overlaps, as shown in Figure 5 c, water surface relaxation rate is obtained using following formula：
In formula, ρwFor water surface relaxation rate, unit is μm/ms；θ is the contact angle of mercury, is 140 ° in this example；γ is mercury
Surface tension, be 7.15 × 10 in this example-3psi·cm；A is constant, is 3 in this example；PtotalIt is single for capillary pressure
Position is Mpa；T2twFor the nuclear magnetic resonance lateral relaxation time for being full of water after washing oil, unit ms.
Surface relaxivity need to divide the water surface relaxation rate that lithology calculates different lithology, and it is thin that this example calculation obtains dolomite dust
The water surface relaxation rate ρ of sandstonew=2.5 × 10-3μm/ms。
Coring sample is full of grease two by step C, the water-oil separating model using the NMR spectrum of area's reservoir
The NMR spectrum of phase is divided into the aqueous spectrum of coring sample and is composed with coring sample oil-containing.The cross that 6ms is detached as water-oil phase
To relaxation time threshold value, by T2Part of the time more than 6ms is that the oil-containing of coring sample is composed, by T2Part of the time less than 6ms is
The aqueous spectrum of coring sample.
Water surface relaxation rate is applied to step C and obtained in aqueous spectrum as shown in Figure 6 a, is calculated above-mentioned by step D
The pore throat radius distribution containing water section of coring sample, as shown in Figure 6 b, calculation formula rw=a × ρw×T2w.In this example,
For white clouds matter Extra-fine sand rock, ρw=2.5 × 10-3μm/ms, a=3.
Step E is distributed, meter according to above-mentioned total pore throat radius distribution and the pore throat radius containing water section of above-mentioned coring sample
Count stating the pore throat radius distribution of the oil-containing part of coring sample in, calculation formula isWherein, roFor above-mentioned coring
The pore throat radius of the oil-containing part of sample is distributed, rwFor the pore throat radius containing water section point of above-mentioned coring sample, rtotalIt is upper
Total pore throat radius distribution is stated, total pore throat radius distribution shown in Fig. 7 a, which is subtracted aqueous pore throat radius shown in Fig. 7 b, to be distributed, and is obtained
Pore throat radius to oil-containing part shown in Fig. 7 c is distributed；
Step F is composed according to the distribution of the pore throat radius of the oil-containing part of above-mentioned coring sample and the oil-containing of above-mentioned coring sample,
Above-mentioned oil meter face relaxation rate is calculated using formula (5), above-mentioned formula (5) is
In above-mentioned formula, ρoFor above-mentioned oil meter face relaxation rate, θ is the contact angle of above-mentioned mercury, is 140 ° in this example, γ is above-mentioned
The surface tension of mercury, this example are 7.15 × 10-3Psicm, a 3, PoAperture for above-mentioned neutral reservoir oil-containing part is corresponding
Capillary pressure, T2oFor the lateral relaxation time of above-mentioned oil-containing spectrum.In this example, white clouds matter Extra-fine sand rock is calculated, ρo
It is 0.25 × 10-3μm/ms。
Above-mentioned is the core experiment for cored interval from step A to step D, and water surface is obtained with core experiment data
The parameter, is then applied to the core of the underground survey for the non-cored interval that subsequent step is directed to by relaxation rate and oil meter face relaxation rate
Magnetic Resonance Spectrum.
Third uses above-mentioned oil meter face relaxation rate ρoTo above-mentioned T2Spectrum oil-containing peak is handled to obtain above-mentioned reservoir oil-containing
Partial pore throat radius distribution, specific formula for calculation are as follows
Ro=a × ρo×T2o
R in above formulaoFor the pore diameter of reservoir oil-containing part, unit is μm；A is 3；T2oLateral for above-mentioned oil-containing spectrum is relaxed
Henan time, unit ms, ρo=0.25 × 10-3 μm/ms.
4th, the pore throat radius distribution of above-mentioned reservoir oil-containing part is corrected using water surface relaxation rate, is obtained
The NMR spectrum for being full of water of the oil-containing part of above-mentioned neutral reservoir after correction, specific formula for calculation are as follows：
In above formula, T1jw,2jwThe aqueous spectrum obtained after oil-containing corrects is composed for reservoir oil-containing；RoFor the hole of reservoir oil-containing part
Larynx radius, unit are μm；ρw=2.5 × 10-3μm/ms；A is 3.
5th, using formula T2tw=T2w∪T2jw, by T2jwWith T2wIt is overlapped, obtains the nuclear-magnetism that neutral reservoir is full of water
Resonate wave spectrum.
Fig. 8 is finally obtained test result figure, is divided into seven regions in figure, is gamma ray curve in first area
(GR), second area is the coordinate of depth, and third region is original nuclear magnetic resonance T2It composes (i.e. original well logging spectrum), in the fourth region
It is the nuclear magnetic resonance T for being full of water2It composes (i.e. aqueous spectrum completely), is that calculated pore throat radius distribution curve is (thin in the 5th region
Line) the analysis pore throat radius distribution curve (thick line) that obtains with experimental analysis, the 6th region is to calculate capillary pressure curve (filament)
It is duty pressure and duty pressure in analysis in calculating in the 7th region with the obtained capillary pressure curve (thick line) of pressure mercury experimental analysis
(dot).
Fig. 9 shows that the corresponding calculated pore throat radius distribution curve of a depth value in the 5th region in Fig. 8 is (empty
Line) the analysis pore throat radius distribution curve (solid line) that obtains with experimental analysis.
As shown in Figure 9, the neutral reservoir after the correction obtained using the application is full of the NMR spectrum calculating of water
Pore throat radius, which is distributed the pore throat radius distribution obtained with experiment, has preferable consistency.
It can be seen from the above description that the above embodiments of the present invention realize following technique effect：
The bearing calibration of the application has fully considered influence of the oiliness to nuclear magnetic resonance log of neutral reservoir, in
The hole of the oil-containing part of property reservoir is full of water NMR spectrum, is corrected to the aqueous spectrum of neutral reservoir, after correction
Wave spectrum is the NMR spectrum for being full of water of neutral reservoir, which can correctly characterize the pore throat radius point of neutral reservoir
Cloth so that those skilled in the art can accurately analyze neutral reservoir, and then carry out rational exploration and development, be conducive to
The development of petroleum industry.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, any made by repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (7)
1. a kind of bearing calibration of nuclear magnetic resonance log wave spectrum, which is characterized in that the bearing calibration includes：
The NMR spectrum of neutral reservoir is divided into aqueous spectrum and oil-containing by step S1 using NMR spectrum disjunctive model
Spectrum；
Step S2 calculates the water surface relaxation rate and oil meter face of the hole of the neutral reservoir using surface relaxivity computation model
Relaxation rate；
Step S3, the pore throat radius that the oil-containing part of the neutral reservoir is calculated using the oil meter face relaxation rate are distributed；
Step S4 is corrected the pore throat radius distribution of the oil-containing part according to the water surface relaxation rate, is corrected
The NMR spectrum for being full of water of the oil-containing part of the neutral reservoir afterwards；And
Step S5 is overlapped the aqueous spectrum and the NMR spectrum for being full of water of the oil-containing part of the correction, obtains
The NMR spectrum for being full of water of the neutral reservoir after to correction,
The step S2 includes：
Step A chooses coring sample, measures the nuclear magnetic resonance for being full of water after the NMR spectrum of the coring sample, washing oil
Total pore throat radius of wave spectrum and the neutral reservoir is distributed；
Step B calculates institute according to the NMR spectrum and capillary pressure curve for being full of water after the washing oil using formula (2)
Water surface relaxation rate is stated, the formula (2) is：
In the formula (2)：
ρwFor the water surface relaxation rate,
θ is the contact angle of mercury,
γ is the surface tension of mercury,
PtotalFor capillary pressure,
T1tw,2twFor the nuclear magnetic resonance lateral relaxation time T for being full of water after the washing oil2twOr longitudinal relaxation time T1tw, unit
For ms；
The NMR spectrum for being full of grease of the coring sample is divided into the aqueous spectrum of coring sample and coring sample by step C
Oil-containing is composed；
Step D calculates the coring sample according to the water surface relaxation rate and the aqueous spectrum of coring sample using formula (3)
The pore throat radius distribution containing water section, the formula (3) is：
rw=a × ρw×T1w,2w……………….(3)
In the formula (3)：
rwIt is distributed for the pore throat radius containing water section of the coring sample,
ρwFor the water surface relaxation rate,
A is constant, and when the pore shape is respectively cylinder, spherical shape, shape channel-shaped, a is respectively 2,3,1,
T1w,2wFor the lateral relaxation time T of the aqueous spectrum of coring sample2wOr longitudinal relaxation time T1w；
Step E is distributed according to total pore throat radius distribution and the pore throat radius containing water section of the coring sample, using formula
(4) the pore throat radius distribution of the oil-containing part of the coring sample is calculated, the formula (4) is：
In the formula (4)：
roPore throat radius for the oil-containing part of the coring sample is distributed,
rwIt is distributed for the pore throat radius containing water section of the coring sample,
rtotalIt is distributed for total pore throat radius；
Step F is composed according to the distribution of the pore throat radius of the oil-containing part of the coring sample and the oil-containing of the coring sample, is used
Formula (5) calculates the oil meter face relaxation rate, and the formula (5) is
In the formula (5)：
ρoFor the oil meter face relaxation rate；
θ is the contact angle of the mercury,
γ is the surface tension of the mercury,
A is constant, and when the pore shape is respectively cylinder, spherical shape, shape channel-shaped, a is respectively 2,3,1,
PoFor the corresponding capillary pressure in aperture of the neutral reservoir oil-containing part, according to the oil-containing part of the coring sample
Pore throat radius distribution is calculated,
T1o,2oFor the lateral relaxation time T of oil-containing spectrum2oOr longitudinal relaxation time T1o,
The step S3 includes：
It is composed according to the oil-containing in the oil meter face relaxation rate and the step S1, the neutral reservoir is calculated using formula (6)
The pore throat radius of oil-containing part is distributed, and the formula (6) is：
Ro=a × ρo×T1o,2o……………….(6)
In the formula (6)：
RoFor the pore throat radius distribution of the neutral reservoir oil-containing part；
ρoFor the oil meter face relaxation rate；
A is constant, and 2 are taken when the pore shape is cylindrical, takes 3 when being spherical, 1 is taken when being channel-shaped；
T1o,2oFor the lateral relaxation time T of oil-containing spectrum2oOr longitudinal relaxation time T1o,
In the step S4, according to the water surface relaxation rate, using formula (7) to the pore throat of the neutral reservoir oil-containing part
Radius distribution is corrected, and obtains the NMR spectrum for being full of water of the neutral reservoir oil-containing part, and the formula (7) is：
In the formula (7)：
T1jw,2jwFor the NMR spectrum for being full of water of the neutral reservoir oil-containing part；
RoFor the pore throat radius distribution of the oil-containing part of the coring sample；
ρwFor the water surface relaxation rate；
A is constant, and when the pore shape is respectively cylinder, spherical shape, shape channel-shaped, a is respectively 2,3,1.
2. bearing calibration according to claim 1, which is characterized in that the NMR spectrum disjunctive model is：
T1w,2w∪T1o,2o=T1,2……………….(1)
In formula (1)：
T1,2For the NMR spectrum of the neutral reservoir；
T1w,2wFor the aqueous spectrum of the neutral reservoir；
T1o,2oFor the oil-containing spectrum of the neutral reservoir.
3. bearing calibration according to claim 1, which is characterized in that the step A includes：
Sealing core drilling sample is chosen, the NMR spectrum of the sealing core drilling sample is measured；
Washing oil is carried out to the sealing core drilling sample, measures the nuclear magnetic resonance wave for being full of water of the coring sample after washing oil
Spectrum；And
Pressure mercury experiment is carried out to the sealing core drilling sample, obtains total pore throat radius distribution.
4. bearing calibration according to claim 1, which is characterized in that the step A includes：
Non- sealing core drilling sample is chosen, washing oil is carried out to the non-sealing core drilling sample, measure after washing oil described non-closed takes
The NMR spectrum for being full of water of heart sample；
Pressure mercury experiment is carried out to the non-sealing core drilling sample after the washing oil, obtains total pore throat radius distribution；And
Core Location is carried out to the non-sealing core drilling sample, using practical logging NMR spectrum as the non-sealing core drilling
The NMR spectrum of sample.
5. bearing calibration according to claim 4, which is characterized in that the core Location is the core Location of Centimeter Level.
6. bearing calibration according to claim 1, which is characterized in that in the step C, based on crude preservation lower limiting value
The NMR spectrum of the coring sample is divided into the aqueous spectrum of coring sample and coring sample by the corresponding nuclear magnetic resonance time
Oil-containing is composed.
7. bearing calibration according to claim 1, which is characterized in that in the step S5, using formula (8) by the step
The aqueous spectrum and the NMR spectrum for being full of water of the neutral reservoir oil-containing part in rapid S1 are overlapped, and obtain institute
The NMR spectrum that neutral reservoir is full of water is stated, the formula (8) is：
T1tw,2tw=T1w,2w∪T1jw,2jw……………….(8)
In the formula (8)：
T1tw,2twIt is full of the NMR spectrum of water for the neutral reservoir；
T1w,2wFor the aqueous spectrum；
T1jw,2jwFor the NMR spectrum for being full of water of the neutral reservoir oil-containing part.
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