CN113027421B - Nuclear magnetic resonance logging T2 spectrum morphology correction method in oil-based drilling fluid environment - Google Patents
Nuclear magnetic resonance logging T2 spectrum morphology correction method in oil-based drilling fluid environment Download PDFInfo
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- 239000012530 fluid Substances 0.000 title claims abstract description 206
- 238000005553 drilling Methods 0.000 title claims abstract description 201
- 238000005481 NMR spectroscopy Methods 0.000 title claims abstract description 187
- 238000001228 spectrum Methods 0.000 title claims abstract description 162
- 238000000034 method Methods 0.000 title claims abstract description 46
- 238000012937 correction Methods 0.000 title claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 74
- 230000035699 permeability Effects 0.000 claims abstract description 59
- 239000011148 porous material Substances 0.000 claims abstract description 41
- 238000012886 linear function Methods 0.000 claims description 12
- 238000002474 experimental method Methods 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 5
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims description 4
- 229910052753 mercury Inorganic materials 0.000 claims description 4
- 229920006395 saturated elastomer Polymers 0.000 claims description 4
- 239000011435 rock Substances 0.000 abstract description 14
- 238000011161 development Methods 0.000 abstract description 2
- 239000000706 filtrate Substances 0.000 description 14
- 238000010586 diagram Methods 0.000 description 10
- 230000009545 invasion Effects 0.000 description 7
- 238000004458 analytical method Methods 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000009736 wetting Methods 0.000 description 3
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 230000005311 nuclear magnetism Effects 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000007619 statistical method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
- G06Q50/02—Agriculture; Fishing; Mining
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
Abstract
The invention relates to the field of oil and gas field exploration and development, and discloses a nuclear magnetic resonance logging T2 spectrum morphology correction method in an oil-based drilling fluid environment. Based on nuclear magnetic resonance logging data actually measured in the existing water-based drilling fluid environment and the oil-based drilling fluid environment, a functional relation between nuclear magnetic resonance logging T2 spectrum in the oil-based drilling fluid environment and the water-based drilling fluid environment is established, the nuclear magnetic resonance logging T2 spectrum morphology in the oil-based drilling fluid environment is corrected, the nuclear magnetic resonance logging T2 spectrum in the oil-based drilling fluid environment can be corrected to the nuclear magnetic resonance logging T2 spectrum in the water-based drilling fluid environment with the corresponding depth, fluid identification is carried out, the purposes of accurately calculating rock physical characteristic parameters and evaluating reservoir pore structures are achieved, and the correction result is helpful for continuously and quantitatively evaluating rock pore structures and calculating permeability according to the nuclear magnetic resonance logging T2 spectrum, so that the application accuracy of the nuclear magnetic resonance logging data in the oil-based drilling fluid environment is improved.
Description
Technical Field
The invention relates to the field of oil and gas field exploration and development, in particular to a nuclear magnetic resonance logging T2 spectrum morphology correction method under an oil-based drilling fluid environment.
Background
Nuclear magnetic resonance logging is capable of evaluating various petrophysical properties of a reservoir, including parameters such as total porosity, permeability, effective porosity, irreducible water saturation, etc., which are independent of lithology, and also the pore structure of the reservoir.
The radial depth of nuclear magnetic resonance logging detection is shallower, and the flushing zone area is mainly detected, so that the measured nuclear magnetic resonance logging T2 spectrum contains the information of drilling fluid filtrate. In the water-based drilling fluid environment, the main component of the drilling fluid filtrate is water, the water wetting phase is dominant in the nuclear magnetic resonance logging detection range, and the distribution form of the nuclear magnetic resonance logging T2 spectrum is not influenced by the water-based drilling fluid filtrate basically, so that the method can be used for calculating physical parameters of reservoir rock and evaluating pore structures, wherein long relaxation time represents large pores, and short relaxation time represents small pores. However, in the oil-based drilling fluid environment, the fluid which invades the detection range of nuclear magnetic resonance logging is mainly oil-based drilling fluid filtrate, and is a non-wetting phase fluid for rock particles, at this time, the volume relaxation of the non-wetting phase oil-based drilling fluid filtrate is not negligible, so that the amplitude and the morphology of the nuclear magnetic resonance logging T2 spectrum are obviously changed compared with those of the nuclear magnetic resonance logging T2 spectrum in the water-based drilling fluid environment. For oil-based drilling fluids with light hydrocarbon as the main component, the penetration of the oil-based drilling fluid filtrate into the nuclear magnetic resonance logging results in serious rightward tailing of the spectral shape of the nuclear magnetic resonance logging T2, large pore artifacts are caused, and the calculated result of the permeability is larger. At this time, the nuclear magnetic resonance log T2 spectrum in the oil-based drilling fluid environment cannot be directly used for reservoir evaluation.
Disclosure of Invention
Based on the problems, the invention aims to provide a nuclear magnetic resonance logging T2 spectrum morphology correction method under an oil-based drilling fluid environment, and the correction result is helpful for continuously and quantitatively evaluating the calculation of the rock pore structure and the permeability according to the nuclear magnetic resonance logging T2 spectrum, so that the accuracy of nuclear magnetic resonance logging data application under the oil-based drilling fluid environment is improved.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a nuclear magnetic resonance logging T2 spectrum morphology correction method under an oil-based drilling fluid environment comprises the following steps:
s1, respectively and actually measuring nuclear magnetic resonance logging data of a reservoir layer of a target area in a water-based drilling fluid environment and an oil-based drilling fluid environment, and processing to obtain a nuclear magnetic resonance logging T2 spectrum and a corresponding permeability curve and a corresponding porosity curve in the corresponding environments;
s2, dividing the reservoir into a plurality of types according to the permeability curve and the porosity curve, respectively capturing nuclear magnetic resonance logging data actually measured in the water-based drilling fluid environment and in the oil-based drilling fluid environment by adopting a two-dimensional grid method for each type of reservoir, and establishing a functional relation between a nuclear magnetic resonance logging T2 spectrum in the oil-based drilling fluid environment and a nuclear magnetic resonance logging T2 spectrum in the water-based drilling fluid environment;
s3, correcting the nuclear magnetic resonance logging T2 spectrum of each type of reservoir stratum in the oil-based drilling fluid environment to the water-based drilling fluid environment, and further continuously and quantitatively evaluating the pore size and the permeability of the reservoir stratum in the oil-based drilling fluid environment by using the corrected nuclear magnetic resonance logging T2 spectrum.
As the optimal scheme of the nuclear magnetic resonance logging T2 spectrum morphology correction method under the oil-based drilling fluid environment, the types of reservoirs are divided into four types, the range of the permeability K of the type I reservoir is K <1mD, the range of the permeability K of the type II reservoir is 1mD or less and K <10mD, the range of the permeability K of the type III reservoir is 10mD or less and K <100mD, and the range of the permeability K of the type IV reservoir is K or more than 100mD.
As the preferable scheme of the nuclear magnetic resonance logging T2 spectrum morphology correction method under the oil-based drilling fluid environment, the upper limit and the lower limit of the porosity and the permeability of a reservoir layer are determined, the porosity and the permeability are divided into a plurality of equal parts between the upper limit and the lower limit, the porosity is taken as an abscissa, the permeability is taken as an ordinate, a two-dimensional grid is obtained, the nuclear magnetic resonance logging T2 spectrum data under the oil-based drilling fluid environment and the water-based drilling fluid environment are divided into corresponding grid units according to the pore permeability value, and the nuclear magnetic resonance logging T2 spectrum sample libraries under the water-based drilling fluid environment and the oil-based drilling fluid environment are respectively formed.
As the preferred scheme of the nuclear magnetic resonance logging T2 spectrum morphology correction method in the oil-based drilling fluid environment, nuclear magnetic resonance experiments and high-pressure mercury injection experiments in the saturated water state are carried out on core samples of each type of reservoir, and a plurality of T2 relaxation times corresponding to the pore size distribution with the greatest influence of each type of reservoir on permeability are obtained.
As the preferable scheme of the nuclear magnetic resonance logging T2 spectrum morphology correction method under the oil-based drilling fluid environment, 5T 2 relaxation times are selected, and the 5T 2 relaxation times given by the class I reservoir are respectively 1.5ms, 3.0ms, 10.0ms, 30.0ms and 50.0ms; the 5T 2 relaxation times given for the group ii reservoirs are 4.0ms, 10.0ms, 40.0ms, 60.0ms, 100.0ms, respectively; the 5T 2 relaxation times given for the class iii reservoir are 10.0ms, 40.0ms, 90.0ms, 220.0ms, 310.0ms, respectively; the 5T 2 relaxation times given for the class iv reservoirs are 50.0ms, 120.0ms, 250.0ms, 410.0ms, 1000.0ms, respectively.
As a preferred scheme of the nuclear magnetic resonance logging T2 spectrum morphology correction method under the oil-based drilling fluid environment, given 5T 2 relaxation times, minimum T2 relaxation time T2min and maximum T2 relaxation time T2max of each type of reservoir layer, the nuclear magnetic resonance logging T2 spectrum under the oil-based drilling fluid environment is divided into 6 sections, the amplitude of the nuclear magnetic resonance logging T2 spectrum of each section is accumulated, and the proportion of pore components in different sections to the total pore components is calculated to obtain 6 porosity X components.
As the preferred scheme of the nuclear magnetic resonance logging T2 spectrum morphology correction method in the oil-based drilling fluid environment, a multi-element linear function relation between the amplitude of each point of the nuclear magnetic resonance logging T2 spectrum composition in the water-based drilling fluid environment and the X components of 6 porosities of the nuclear magnetic resonance logging T2 spectrum in the oil-based drilling fluid environment is established, and the nuclear magnetic resonance logging T2 spectrum amplitudes in the water-based drilling fluid environment with different T2 relaxation times are calculated from the nuclear magnetic resonance logging T2 spectrum in the oil-based drilling fluid environment.
As the preferred scheme of the nuclear magnetic resonance logging T2 spectrum morphology correction method in the oil-based drilling fluid environment, the multi-element linear function relation between the amplitude of each point of the nuclear magnetic resonance logging T2 spectrum composition in the water-based drilling fluid environment and the 6 porosity X components of the nuclear magnetic resonance logging T2 spectrum in the oil-based drilling fluid environment is as follows:
A 1 ＝a 11 X 1 +a 12 X 2 +a 13 X 3 +a 14 X 4 +a 15 X 5 +a 16 X 6 +b 1
A 2 ＝a 21 X 1 +a 22 X 2 +a 23 X 3 +a 24 X 4 +a 25 X 5 +a 26 X 6 +b 2
A 3 ＝a 31 X 1 +a 32 X 2 +a 33 X 3 +a 34 X 4 +a 35 X 5 +a 36 X 6 +b 3
...
A i ＝a i1 X 1 +a i2 X 2 +a i3 X 3 +a i4 X 4 +a i5 X 5 +a i6 X 6 +b i
in the above, A i The amplitude value corresponding to the ith distribution point of the corrected nuclear magnetic resonance logging T2 spectrum is represented, and the value of i is the distribution point number of the nuclear magnetic resonance logging T2 spectrum; x is X 1 ,X 2 ......X 6 6 porosity X components divided for corresponding reservoir types; a, a i1 ,a i2 ......a i6 The numerical value of the coefficient corresponding to the polynary linear function corresponding to the ith distribution point is obtained by calibrating nuclear magnetic resonance logging T2 spectrum data in a water-based drilling fluid environment and an oil-based drilling fluid environment in a sample library; b 1 ,b 2 ......b i And (3) calibrating constant coefficients corresponding to the multiple linear functions corresponding to the ith distribution point by using nuclear magnetic resonance logging T2 spectrum data in a water-based drilling fluid environment and an oil-based drilling fluid environment in a sample library.
As the preferable scheme of the nuclear magnetic resonance logging T2 spectrum shape correction method under the oil-based drilling fluid environment, the nuclear magnetic resonance logging T2 spectrum under the corrected water-based drilling fluid environment is drawn according to the calculated nuclear magnetic resonance logging T2 spectrum amplitude and the corresponding T2 relaxation time.
As the preferable scheme of the nuclear magnetic resonance logging T2 spectrum morphology correction method under the oil-based drilling fluid environment, the comprehensive interpretation graph is drawn in the logging interpretation platform according to the nuclear magnetic resonance logging T2 spectrum under the corrected water-based drilling fluid environment.
The beneficial effects of the invention are as follows:
according to the nuclear magnetic resonance logging T2 spectrum morphology correction method under the oil-based drilling fluid environment, firstly, nuclear magnetic resonance logging data of a reservoir layer of a target area are actually measured under the water-based drilling fluid environment and the oil-based drilling fluid environment respectively, nuclear magnetic resonance logging T2 spectrums under the corresponding environments and corresponding permeability curves and porosity curves are obtained through processing, then, the reservoir layer is divided into a plurality of types according to the permeability curves and the porosity curves, the nuclear magnetic resonance logging data actually measured under the water-based drilling fluid environment and the oil-based drilling fluid environment are respectively captured for each type of reservoir layer by adopting a two-dimensional grid method, a functional relation between the nuclear magnetic resonance logging T2 spectrums under the oil-based drilling fluid environment and the nuclear magnetic resonance logging T2 spectrums under the water-based drilling fluid environment is established, finally, the nuclear magnetic resonance logging T2 spectrums of each type of reservoir layer under the oil-based drilling fluid environment are corrected to the water-based drilling fluid environment, and further, the pore size and the permeability of the reservoir layer under the oil-based drilling fluid environment are continuously and quantitatively evaluated. According to the nuclear magnetic resonance logging T2 spectrum form correction method under the oil-based drilling fluid environment, on the basis of the existing nuclear magnetic resonance logging data actually measured under the water-based drilling fluid environment and the oil-based drilling fluid environment, the functional relation between the nuclear magnetic resonance logging T2 spectrum under the oil-based drilling fluid environment and the nuclear magnetic resonance logging T2 spectrum under the water-based drilling fluid environment is established, the nuclear magnetic resonance logging T2 spectrum form under the oil-based drilling fluid environment is corrected, the nuclear magnetic resonance logging T2 spectrum under the oil-based drilling fluid environment can be corrected to the nuclear magnetic resonance logging T2 spectrum under the water-based drilling fluid environment with the corresponding depth, fluid identification is carried out, the purposes of accurately calculating the rock physical characteristic parameters and evaluating the pore structure of a reservoir layer are achieved, the problems that the nuclear magnetic resonance logging T2 spectrum form is obviously changed due to the invasion of oil-based drilling fluid filtrate, the rock pore structure cannot be accurately and quantitatively evaluated and accurately and quantitatively, and quantitatively calculating the evaluating parameters of the reservoir layer are solved, and the correction result is helpful for continuously evaluating the rock pore structure and quantitatively according to the nuclear magnetic resonance logging T2 spectrum calculation, and the accuracy of nuclear magnetic resonance logging data application under the oil-based drilling fluid environment is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following description will briefly explain the drawings needed in the description of the embodiments of the present invention, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the contents of the embodiments of the present invention and these drawings without inventive effort for those skilled in the art.
FIG. 1 is a schematic flow chart of a method for correcting the morphology of a nuclear magnetic resonance log T2 spectrum in an oil-based drilling fluid environment according to an embodiment of the present invention;
FIG. 2 is a comprehensive explanatory diagram of nuclear magnetic resonance logging in an oil-based drilling fluid environment in a method for correcting the morphology of a nuclear magnetic resonance log T2 spectrum in the oil-based drilling fluid environment according to an embodiment of the present invention;
FIG. 3 is a comprehensive interpretation diagram of nuclear magnetic resonance logging in an oil-based drilling fluid environment in a method for correcting the morphology of nuclear magnetic resonance logging T2 spectrum in the oil-based drilling fluid environment according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of extracting a nuclear magnetic resonance log T2 spectrum by a two-dimensional grid method in a nuclear magnetic resonance log T2 spectrum morphology correction method under an oil-based drilling fluid environment according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of measured NMR log T2 spectra under different drilling fluid types from a type I reservoir in a method for correcting NMR log T2 spectra morphology in an oil-based drilling fluid environment according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of measured NMR log T2 spectra under different drilling fluid type drilling conditions extracted from a type II reservoir in a method for correcting NMR log T2 spectra morphology in an oil-based drilling fluid environment according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of measured NMR log T2 spectra under different drilling fluid types extracted from a reservoir of type III in a method for correcting morphology of NMR log T2 spectra in an oil-based drilling fluid environment according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of measured NMR log T2 spectra under different drilling fluid types extracted from a class IV reservoir in a method for correcting NMR log T2 spectra morphology in an oil-based drilling fluid environment according to an embodiment of the present invention;
FIG. 9 is a comprehensive explanatory diagram of a nuclear magnetic resonance log T2 spectrum obtained by correcting an actually measured nuclear magnetic resonance log T2 spectrum in an oil-based drilling fluid environment in a nuclear magnetic resonance log T2 spectrum morphology correction method in an oil-based drilling fluid environment according to an embodiment of the present invention;
fig. 10 is an accuracy verification chart of a method for calculating permeability by using a nuclear magnetic resonance logging T2 spectrum under a water-based drilling fluid environment obtained after correction in a nuclear magnetic resonance logging T2 spectrum morphology correction method under an oil-based drilling fluid environment according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixed or removable, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 1, the embodiment provides a method for correcting a spectrum morphology of a nuclear magnetic resonance log T2 in an oil-based drilling fluid environment, which includes the following steps:
s1, respectively and actually measuring nuclear magnetic resonance logging data of a reservoir layer of a target area in a water-based drilling fluid environment and an oil-based drilling fluid environment, and processing to obtain a nuclear magnetic resonance logging T2 spectrum and a corresponding permeability curve and a corresponding porosity curve in the corresponding environments;
s2, dividing the reservoir into a plurality of types according to the permeability curve and the porosity curve, respectively capturing nuclear magnetic resonance logging data actually measured in the water-based drilling fluid environment and in the oil-based drilling fluid environment by adopting a two-dimensional grid method for each type of reservoir, and establishing a functional relation between a nuclear magnetic resonance logging T2 spectrum in the oil-based drilling fluid environment and a nuclear magnetic resonance logging T2 spectrum in the water-based drilling fluid environment;
s3, correcting the nuclear magnetic resonance logging T2 spectrum of each type of reservoir stratum in the oil-based drilling fluid environment to the water-based drilling fluid environment, and further continuously and quantitatively evaluating the pore size and the permeability of the reservoir stratum in the oil-based drilling fluid environment by using the corrected nuclear magnetic resonance logging T2 spectrum.
Based on nuclear magnetic resonance logging data actually measured in the existing water-based drilling fluid environment and the oil-based drilling fluid environment, a functional relation between nuclear magnetic resonance logging T2 spectrum in the oil-based drilling fluid environment and the water-based drilling fluid environment is established, nuclear magnetic resonance logging T2 spectrum morphology in the oil-based drilling fluid environment is corrected, nuclear magnetic resonance logging T2 spectrum in the oil-based drilling fluid environment can be corrected to nuclear magnetic resonance logging T2 spectrum in the water-based drilling fluid environment with corresponding depth, fluid identification is carried out, the purposes of accurately calculating rock physical characteristic parameters and evaluating reservoir pore structures are achieved, the problems that nuclear magnetic resonance logging T2 spectrum morphology is obviously changed due to oil-based drilling fluid filtrate invasion, rock pore structures cannot be accurately and quantitatively evaluated and reservoir evaluation parameters cannot be calculated are solved, and the correction result is helpful for continuously and quantitatively evaluating calculation of rock pore structures and permeability according to the nuclear magnetic resonance logging T2 spectrum, so that the accuracy of nuclear magnetic resonance logging data application in the oil-based drilling fluid environment is improved.
Taking measured nmr logging data of a certain oil-gas field as an example, coring data of a target area and actually measured nmr logging data of a water-based drilling fluid well (i.e. under a water-based drilling fluid environment) and an oil-based drilling fluid well (i.e. under an oil-based drilling fluid environment) are collected, and the collected nmr logging data are subjected to data processing by a CIFLOG interpretation platform to respectively obtain comprehensive logging interpretation diagrams under two drilling conditions, as shown in fig. 2 and 3. In fig. 2 and 3, the first path is GR (natural gamma curve), CAL (borehole diameter curve), BIT (BIT diameter curve), the second path is a depth path, the third path is a resistivity curve, the fourth path is a three-porosity curve, the fifth path is an actually measured nmr log T2 spectrum before correction, the sixth path is a calculated nuclear magnetic porosity and a comparative path for core analysis porosity, the seventh path is a comparative path for calculated nuclear magnetic permeability before and after correction, and the eighth path is a lithology section. As can be seen from fig. 3, for the oil-based drilling fluid with light hydrocarbon as the main component, the penetration of the nmr logging by the oil-based drilling fluid filtrate can cause serious rightward tailing of the nmr logging T2 spectral shape, resulting in macroporosity artifact, and larger calculation result of permeability.
Alternatively, the types of reservoirs are divided into four types, the range of the permeability K of the type I reservoir is K <1mD, the range of the permeability K of the type II reservoir is 1mD less than or equal to K <10mD, the range of the permeability K of the type III reservoir is 10mD less than or equal to K <100mD, and the range of the permeability K of the type IV reservoir is K more than or equal to 100mD.
Since the permeability determines the seepage capability of the reservoir, namely the invasion degree of the oil-based drilling fluid filtrate into the reservoir, the degrees of displacement of the stratum fluid by the oil-based drilling fluid filtrate in stratum invasion zones with different permeabilities are different, so that the corresponding characteristic differences of the nuclear magnetic resonance logging T2 spectrum under different invasion states are obvious, and the reservoir needs to be classified according to the size of the permeability value.
Optionally, determining an upper limit and a lower limit of porosity and permeability of the reservoir, dividing the porosity and the permeability into a plurality of equal parts between the upper limit and the lower limit, taking the porosity as an abscissa, taking the permeability as an ordinate, obtaining a two-dimensional grid, dividing nuclear magnetic resonance logging T2 spectrum data in the oil-based drilling fluid environment and the water-based drilling fluid environment into corresponding grid units point by point according to pore permeability values, and respectively forming a nuclear magnetic resonance logging T2 spectrum sample library in the water-based drilling fluid environment and the oil-based drilling fluid environment.
And constructing a nuclear magnetic resonance logging T2 spectrum sample library of the research area by utilizing a two-dimensional grid technology, taking the porosity as an abscissa and the permeability as an ordinate, and carrying out statistical analysis, wherein the porosity of a reservoir layer of the research area is 6% in a lower limit, 25% in an upper limit, 0.01mD in a lower limit and 1000mD in an upper limit. As shown in fig. 4, the above two parameters were divided into 1000 equal parts between the upper and lower limits, thus obtaining 1000×1000 grids, each corresponding to a range of porosity and permeability. The typical reservoir of the research area divides nuclear magnetic resonance logging T2 spectrum data in the oil-based drilling fluid environment and the water-based drilling fluid environment into corresponding cells point by point according to the pore penetration value, and a nuclear magnetic resonance logging T2 spectrum sample library in the water-based drilling fluid environment and the oil-based drilling fluid environment is respectively formed, as shown in figures 5 to 8.
Optionally, performing nuclear magnetic resonance experiments and high-pressure mercury injection experiments on core samples of each type of reservoir stratum in a saturated water state, and obtaining a plurality of T2 relaxation times corresponding to pore size distribution, which has the greatest influence on permeability, of each type of reservoir stratum.
And performing nuclear magnetic resonance experiments and high-pressure mercury injection experiments on core samples of four reservoir types in a saturated water state to obtain 5 nuclear magnetic T2 relaxation times corresponding to pore size distribution with the greatest influence of each reservoir type on permeability, wherein the relaxation times represent pore spaces possibly invaded by oil-based drilling fluid filtrate.
Alternatively, 5T 2 relaxation times are chosen, the 5T 2 relaxation times given for a class i reservoir being 1.5ms, 3.0ms, 10.0ms, 30.0ms, 50.0ms, respectively; the 5T 2 relaxation times given for the group ii reservoirs are 4.0ms, 10.0ms, 40.0ms, 60.0ms, 100.0ms, respectively; the 5T 2 relaxation times given for the class iii reservoir are 10.0ms, 40.0ms, 90.0ms, 220.0ms, 310.0ms, respectively; the 5T 2 relaxation times given for the class iv reservoirs are 50.0ms, 120.0ms, 250.0ms, 410.0ms, 1000.0ms, respectively.
Optionally, given 5T 2 relaxation times, a minimum T2 relaxation time T2min and a maximum T2 relaxation time T2max for each type of reservoir, dividing the nmr log T2 spectrum in the oil-based drilling fluid environment into 6 intervals, accumulating the amplitudes of the nmr log T2 spectrum in each interval, and calculating the proportion of the pore components in different intervals to the total pore components to obtain 6 pore X components.
And correcting the nuclear magnetic resonance logging T2 spectrum of reservoir types in four oil-based drilling fluid environments by adopting the following method to obtain the nuclear magnetic resonance logging T2 spectrum in the water-based drilling fluid environment. For each reservoir type, given 5T 2 relaxation times, a nuclear magnetic minimum T2 relaxation time t2min=0.3 ms and a maximum T2 relaxation time t2max=3000 ms, 7T 2 relaxation times total divide the nuclear magnetic resonance T2 spectrum into 6 intervals, accumulate the nuclear magnetic resonance T2 spectrum magnitudes of each interval, and calculate the proportion of the pore components in different intervals to the total pore components, thus obtaining 6 pore X components.
Optionally, a multi-element linear function relation between the amplitude of each point of the composition of the nuclear magnetic resonance logging T2 spectrum in the water-based drilling fluid environment and the 6 porosity X components of the nuclear magnetic resonance logging T2 spectrum in the oil-based drilling fluid environment is established, and the nuclear magnetic resonance logging T2 spectrum amplitudes in the water-based drilling fluid environment with different T2 relaxation times are calculated from the nuclear magnetic resonance logging T2 spectrum in the oil-based drilling fluid environment.
Optionally, the magnitude of each point of the composition of the nmr logging T2 spectrum in the water-based drilling fluid environment and the 6 porosity X components of the nmr logging T2 spectrum in the oil-based drilling fluid environment have a multiple linear function relationship:
A 1 ＝a 11 X 1 +a 12 X 2 +a 13 X 3 +a 14 X 4 +a 15 X 5 +a 16 X 6 +b 1
A 2 ＝a 21 X 1 +a 22 X 2 +a 23 X 3 +a 24 X 4 +a 25 X 5 +a 26 X 6 +b 2
A 3 ＝a 31 X 1 +a 32 X 2 +a 33 X 3 +a 34 X 4 +a 35 X 5 +a 36 X 6 +b 3
...
A i ＝a i1 X 1 +a i2 X 2 +a i3 X 3 +a i4 X 4 +a i5 X 5 +a i6 X 6 +b i
in the above, A i The amplitude value corresponding to the ith distribution point of the corrected nuclear magnetic resonance logging T2 spectrum is represented, and the value of i is the distribution point number of the nuclear magnetic resonance logging T2 spectrum; x is X 1 ,X 2 ......X 6 6 porosity X components divided for corresponding reservoir types; a, a i1 ,a i2 ......a i6 The numerical value of the coefficient corresponding to the polynary linear function corresponding to the ith distribution point is obtained by calibrating nuclear magnetic resonance logging T2 spectrum data in a water-based drilling fluid environment and an oil-based drilling fluid environment in a sample library; b 1 ,b 2 ......b i And (3) calibrating constant coefficients corresponding to the multiple linear functions corresponding to the ith distribution point by using nuclear magnetic resonance logging T2 spectrum data in a water-based drilling fluid environment and an oil-based drilling fluid environment in a sample library.
Optionally, drawing a nuclear magnetic resonance log T2 spectrum in the corrected water-based drilling fluid environment according to the calculated nuclear magnetic resonance log T2 spectrum amplitude and the corresponding T2 relaxation time.
Optionally, a comprehensive interpretation map is drawn in a logging interpretation platform from the nuclear magnetic resonance log T2 spectrum in the corrected water-based drilling fluid environment.
As shown in fig. 9, a corresponding hooking program is compiled on the ciflow interpretation platform, and a comprehensive interpretation diagram for correcting the nuclear magnetic resonance logging T2 spectrum under the oil-based drilling fluid environment actually measured by a certain oil-gas field is obtained. The first line in the figure is GR (natural gamma curve), CAL (borehole diameter curve), BIT (BIT diameter curve); the second track is a depth track; the third trace is a resistivity curve; the fourth is a three-porosity curve; the fifth is the measured nuclear magnetic resonance log T2 spectrum before correction; the sixth path is a nuclear magnetic resonance logging T2 spectrum in a water-based drilling fluid environment, which is obtained by correcting the nuclear magnetic resonance logging T2 spectrum in the oil-based drilling fluid environment obtained by actual measurement, and compared with the nuclear magnetic resonance logging T2 spectrum before correction, the nuclear magnetic resonance logging T2 spectrum in the water-based drilling fluid environment obtained by the method is shifted left, the tailing phenomenon disappears, the number of main peaks of the T2 spectrum is changed from double peaks to single peaks, and the influence of the invasion of oil-based drilling fluid filtrate is eliminated; the seventh path is a comparative path of the calculated porosity of the nuclear magnetism and the analysis porosity of the core; the eighth path is a comparison path of the calculated permeability of the nuclear magnetism before and after correction, and it can be seen that in the oil-based drilling fluid environment, the permeability result calculated by using the nuclear magnetic resonance logging T2 spectrum is obviously larger than the core analysis permeability, the permeability calculated by using the nuclear magnetic resonance logging T2 spectrum in the water-based drilling fluid environment obtained after correction is smaller, the matching effect with the core analysis permeability result is better, and from fig. 10, the matching effect of the permeability calculated by using the corrected nuclear magnetic resonance logging T2 spectrum with the core analysis structure is better; and the ninth is lithology section.
According to the nuclear magnetic resonance logging T2 spectrum morphology correction method under the oil-based drilling fluid environment, on the basis of nuclear magnetic resonance logging data actually measured under the existing water-based drilling fluid environment and the oil-based drilling fluid environment, a functional relation between the nuclear magnetic resonance logging T2 spectrum under the oil-based drilling fluid environment and the nuclear magnetic resonance logging T2 spectrum under the water-based drilling fluid environment is established, the nuclear magnetic resonance logging T2 spectrum morphology under the oil-based drilling fluid environment is corrected, the nuclear magnetic resonance logging T2 spectrum under the oil-based drilling fluid environment can be corrected to the nuclear magnetic resonance logging T2 spectrum under the water-based drilling fluid environment with the corresponding depth, fluid identification is carried out, the purposes of accurately calculating rock physical characteristic parameters and evaluating the nuclear magnetic resonance reservoir pore structure are achieved, the problems that nuclear magnetic resonance logging T2 spectrum morphology is obviously changed due to invasion of oil-based drilling fluid filtrate, the rock pore structure cannot be accurately and quantitatively evaluated and accurately and quantitatively, and quantitatively evaluating parameters of the reservoir are calculated are solved, and the correction result is helpful for continuously and quantitatively evaluating the calculation of rock pore structure and permeability according to the nuclear magnetic resonance logging T2 spectrum, and the nuclear magnetic resonance logging data application accuracy under the oil-based drilling fluid environment is improved.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (8)
1. The nuclear magnetic resonance logging T2 spectrum morphology correction method in the oil-based drilling fluid environment is characterized by comprising the following steps of:
s1, respectively and actually measuring nuclear magnetic resonance logging data of a reservoir layer of a target area in a water-based drilling fluid environment and an oil-based drilling fluid environment, and processing to obtain a nuclear magnetic resonance logging T2 spectrum and a corresponding permeability curve and a corresponding porosity curve in the corresponding environments;
s2, dividing the reservoir into a plurality of types according to the permeability curve and the porosity curve, respectively capturing nuclear magnetic resonance logging data actually measured in the water-based drilling fluid environment and in the oil-based drilling fluid environment by adopting a two-dimensional grid method for each type of reservoir, and establishing a functional relation between a nuclear magnetic resonance logging T2 spectrum in the oil-based drilling fluid environment and a nuclear magnetic resonance logging T2 spectrum in the water-based drilling fluid environment;
s3, correcting a nuclear magnetic resonance logging T2 spectrum of each type of reservoir stratum in an oil-based drilling fluid environment to a water-based drilling fluid environment, and further continuously and quantitatively evaluating the pore size and the permeability of the reservoir stratum in the oil-based drilling fluid environment by using the corrected nuclear magnetic resonance logging T2 spectrum;
establishing a multi-element linear function relation between the amplitude of each point of the nuclear magnetic resonance logging T2 spectrum composition in the water-based drilling fluid environment and 6 porosity X components of the nuclear magnetic resonance logging T2 spectrum in the oil-based drilling fluid environment, and calculating the nuclear magnetic resonance logging T2 spectrum amplitude in the water-based drilling fluid environment with different T2 relaxation times from the nuclear magnetic resonance logging T2 spectrum in the oil-based drilling fluid environment;
the multi-element linear function relation between the amplitude of each point of the composition of the nuclear magnetic resonance logging T2 spectrum in the water-based drilling fluid environment and the 6 porosity X components of the nuclear magnetic resonance logging T2 spectrum in the oil-based drilling fluid environment is as follows:
A 1 ＝a 11 X 1 +a 12 X 2 +a 13 X 3 +a 14 X 4 +a 15 X 5 +a 16 X 6 +b 1
A 2 ＝a 21 X 1 +a 22 X 2 +a 23 X 3 +a 24 X 4 +a 25 X 5 +a 26 X 6 +b 2
A 3 ＝a 31 X 1 +a 32 X 2 +a 33 X 3 +a 34 X 4 +a 35 X 5 +a 36 X 6 +b 3
...
A i ＝a i1 X 1 +a i2 X 2 +a i3 X 3 +a i4 X 4 +a i5 X 5 +a i6 X 6 +b i
in the above, A i The amplitude value corresponding to the ith distribution point of the corrected nuclear magnetic resonance logging T2 spectrum is represented, and the value of i is the distribution point number of the nuclear magnetic resonance logging T2 spectrum; x is X 1 ,X 2 ......X 6 6 porosity X components divided for corresponding reservoir types; a, a i1 ,a i2 ......a i6 The numerical value of the coefficient corresponding to the polynary linear function corresponding to the ith distribution point is obtained by calibrating nuclear magnetic resonance logging T2 spectrum data in a water-based drilling fluid environment and an oil-based drilling fluid environment in a sample library; b 1 ,b 2 ......b i And (3) calibrating constant coefficients corresponding to the multiple linear functions corresponding to the ith distribution point by using nuclear magnetic resonance logging T2 spectrum data in a water-based drilling fluid environment and an oil-based drilling fluid environment in a sample library.
2. The method of claim 1, wherein the types of reservoirs are divided into four types, the range of K is 1mD for the permeability of the reservoir of type i, the range of K is 1mD or less and 10mD for the permeability of the reservoir of type ii, the range of K is 10mD or less and K is 100mD for the permeability of the reservoir of type iii, and the range of K is 100mD or more.
3. The method for correcting the nuclear magnetic resonance logging T2 spectrum morphology under the oil-based drilling fluid environment according to claim 1, wherein the upper limit and the lower limit of the porosity and the permeability of the reservoir are determined, the porosity and the permeability are divided into a plurality of equal parts between the upper limit and the lower limit, a two-dimensional grid is obtained by taking the porosity as an abscissa and the permeability as an ordinate, and nuclear magnetic resonance logging T2 spectrum data under the oil-based drilling fluid environment and under the water-based drilling fluid environment are divided into corresponding grid units point by point according to the pore permeability value, so as to respectively form a nuclear magnetic resonance logging T2 spectrum sample library under the water-based drilling fluid environment and under the oil-based drilling fluid environment.
4. The method for correcting the morphology of nuclear magnetic resonance logging (T2) in the oil-based drilling fluid environment according to claim 1, wherein nuclear magnetic resonance experiments and high-pressure mercury injection experiments in a saturated water state are performed on core samples of each type of reservoir, and a plurality of T2 relaxation times corresponding to pore size distribution with the greatest influence of each type of reservoir on permeability are obtained.
5. The method of claim 4, wherein the T2 relaxation times are 5, and the 5T 2 relaxation times given by the type i reservoir are 1.5ms, 3.0ms, 10.0ms, 30.0ms, and 50.0ms, respectively; the 5T 2 relaxation times given for the group ii reservoirs are 4.0ms, 10.0ms, 40.0ms, 60.0ms, 100.0ms, respectively; the 5T 2 relaxation times given for the class iii reservoir are 10.0ms, 40.0ms, 90.0ms, 220.0ms, 310.0ms, respectively; the 5T 2 relaxation times given for the class iv reservoirs are 50.0ms, 120.0ms, 250.0ms, 410.0ms, 1000.0ms, respectively.
6. The method for correcting the morphology of a nuclear magnetic resonance log T2 spectrum in an oil-based drilling fluid environment according to claim 1, wherein the given 5T 2 relaxation times, the minimum T2 relaxation time T2min and the maximum T2 relaxation time T2max of each type of reservoir divide the nuclear magnetic resonance log T2 spectrum in the oil-based drilling fluid environment into 6 intervals, the amplitudes of the nuclear magnetic resonance log T2 spectrum of each interval are accumulated, and the proportion of the pore components in different intervals to the total pore components is calculated to obtain 6 pore X components.
7. The method for correcting the morphology of a nuclear magnetic resonance log T2 spectrum in an oil-based drilling fluid environment according to claim 1, wherein the corrected nuclear magnetic resonance log T2 spectrum in the water-based drilling fluid environment is drawn according to the calculated amplitude of the nuclear magnetic resonance log T2 spectrum and the corresponding T2 relaxation time.
8. The method for correcting the morphology of a nuclear magnetic resonance well log T2 spectrum in an oil-based drilling fluid environment according to claim 1, wherein a comprehensive interpretation graph is drawn in a well logging interpretation platform according to the nuclear magnetic resonance well log T2 spectrum in the corrected water-based drilling fluid environment.
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