CN113484291A - Method for determining oil gas filling time by utilizing maturity and storage medium - Google Patents
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- 238000011158 quantitative evaluation Methods 0.000 claims description 10
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- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 claims description 9
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- DOWJXOHBNXRUOD-UHFFFAOYSA-N 1-methylphenanthrene Chemical class C1=CC2=CC=CC=C2C2=C1C(C)=CC=C2 DOWJXOHBNXRUOD-UHFFFAOYSA-N 0.000 description 1
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- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/6428—Measuring fluorescence of fluorescent products of reactions or of fluorochrome labelled reactive substances, e.g. measuring quenching effects, using measuring "optrodes"
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- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/6428—Measuring fluorescence of fluorescent products of reactions or of fluorochrome labelled reactive substances, e.g. measuring quenching effects, using measuring "optrodes"
- G01N21/643—Measuring fluorescence of fluorescent products of reactions or of fluorochrome labelled reactive substances, e.g. measuring quenching effects, using measuring "optrodes" non-biological material
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/62—Detectors specially adapted therefor
- G01N30/72—Mass spectrometers
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Abstract
The invention provides a method and a storage medium for determining oil and gas filling time by using maturity, wherein the method comprises the following steps: a quantitative relation is established according to the fluorescence spectrum parameters and the maturity of the crude oil measured, and the maturity of the oil gas filled in different periods can be rapidly obtained by combining the lithology characteristics of the oil gas inclusion. The source rock is increasing continuously in the process of thermal evolution and is an irreversible process. Therefore, the basin simulation technology can be utilized to recover the maturity history of the source rocks in the research area, the maturity of the oil gas filled in each stage is combined, the oil gas filling time in each stage can be rapidly determined, and the interference of multi-solution is effectively avoided.
Description
Technical Field
The invention relates to the technical field of petroleum geological exploration, in particular to the field of oil-gas chemistry, and specifically relates to a method and a storage medium for determining oil-gas filling time by using maturity.
Background
Methods for evaluating the oil and gas filling time are mature at present, and research methods for determining the oil and gas filling time include but are not limited to fluid inclusion temperature measurement, apatite fission trace, U-Pb isotope absolute year determination and the like. The methods have the disadvantages of complicated experimental process, long experimental period and quite high cost. Therefore, whether a method for rapidly and cheaply determining the filling time of filling oil and gas in different periods in an oil reservoir can be provided is a technical problem to be solved urgently in the fields of petroleum geology and oil and gas geochemistry. .
Disclosure of Invention
The invention solves the main problem of calibrating the multiresolution of oil gas filling time by using an inclusion temperature measurement method.
The invention provides a method for determining oil-gas filling time by using maturity, which comprises the following steps:
collecting hydrocarbon source rock information and preprocessing an oil sample;
performing fluorescence test on the pretreated oil sample to obtain a first fluorescence spectrum parameter;
acquiring geochemical data of the oil sample by utilizing GC-MS (gas chromatography-Mass spectrometer) on-line analysis according to the first fluorescence spectrum parameter;
calculating to obtain a maturity parameter of the oil sample according to the geochemical data, and calculating to obtain the maturity of the oil sample according to the maturity parameter;
according to the first fluorescence spectrum parameter and the maturity of the oil sample, a fluorescence spectrum parameter-maturity quantitative evaluation chart is manufactured;
selecting a reservoir rock sample and manufacturing an oil inclusion;
distinguishing lithofacies characteristics of the oil inclusion of different periods, performing fluorescence test to obtain a second fluorescence spectrum parameter, and evaluating the oil and gas maturity of the oil inclusion of different periods by using the fluorescence spectrum parameter-maturity quantitative evaluation chart;
crushing a rock sample of a single-stage secondary oil inclusion according to the second fluorescence spectrum parameter, extracting inclusion oil, comparing geochemical data and determining an oil gas source;
recovering the maturity history of the source rocks according to maturity data in the source rock information;
and calibrating the oil and gas maturity of the oil inclusion in different periods on the history of the maturity of the hydrocarbon source rock, so as to determine the oil and gas filling time in each period.
Further, the pre-treating the oil sample comprises:
if the oil sample is a heavy oil, and/or, an extra heavy oil:
dissolving heavy oil and/or extra heavy oil with chromatographically pure hexane;
placing the dissolved oil sample in an ultrasonic oscillator for oscillation, thereby filtering out asphaltene;
and rotationally evaporating the oil sample with the asphaltene filtered out at a preset temperature, and collecting residual oily substances to be used as an oil sample for subsequent analysis.
Further, the distinguishing the petrographic features of the oil inclusion of different periods and performing a fluorescence test comprises:
and smearing the oil sample on a glass sheet which is cleaned and dried by chloroform, quickly covering the glass sheet with another glass sheet which is subjected to the same treatment process to ensure that the oil sample is uniformly distributed on the glass sheet, and then carrying out fluorescence spectrum test by using the glass sheet.
Further, the first fluorescence spectrum parameter includes:
the wavelength lambda max corresponding to the maximum intensity of the fluorescence spectrum of the oil sample, and the spectral parameter QF535, wherein:
QF535＝SA/SB，
wherein SAIs the area enclosed by the wavelengths 720nm and 535nm, SBThe area bounded by the wavelengths 535nm and 420 nm.
Further, the selecting reservoir rock and making oil inclusion comprises:
and cleaning the reservoir rock sample by using deionized water, airing the cleaned rock sample, and manufacturing the aired rock sample into a double-sided polishing sheet with the preset thickness.
Further, the wavelength λ max is linearly related to the maturity, and gradually decreases with increasing maturity.
Further, the spectral parameter QF535 is exponentially related to the maturity, decreasing with increasing maturity.
Further, the relationship between the wavelengths λ max and Ro and the spectral parameters QF535 and Ro is established, respectively, and is set at the coefficient R2Establishing a relation graph between the first fluorescence spectrum parameter and the maturity when the first fluorescence spectrum parameter is larger than the threshold valueAnd (4) printing.
Further, the crushing the rock sample of the single-stage secondary oil inclusion according to the second fluorescence spectrum parameter comprises:
selecting a rock sample with a contemporary oil inclusion:
crushing the rock sample, and then using dichloromethane to shake and clean the surfaces of the crushed rock particles;
grinding the rock particles after shaking and cleaning:
the ground rock particles were extracted with chloroform.
According to another aspect of the invention, a computer storage medium having stored thereon a method of determining hydrocarbon charge time using maturity as set forth in any one of the preceding claims is also disclosed.
According to the method, a quantitative relation is established according to the fluorescence spectrum parameters and the maturity of the crude oil measured, the lithology characteristics of the oil-gas inclusion are combined, the maturity of the oil-gas filled in different periods can be rapidly and quantitatively evaluated, the history of the maturity of the hydrocarbon source rock in the research area is restored by using the basin simulation technology, the oil-gas filled time in each period can be rapidly determined by combining the maturity of the oil-gas filled in each period, the interference of multi-solution is effectively avoided, and the problem of multi-solution of calibrating the oil-gas filled time by using the inclusion temperature measuring method is solved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a schematic flow diagram of a method for determining hydrocarbon charge time using crude oil fluorescence spectroscopy according to the present invention;
FIG. 2 is a fitting relationship diagram between fluorescence spectrum parameters λ max and maturity Ro of crude oil in Taenia basin Tahe oil field;
FIG. 3 is a fitting relation diagram between fluorescence spectrum parameters QF535 and maturity Ro of crude oil in Tarim basin Tahe oil field;
FIG. 4 is a chart of fluorescence spectrum parameter-maturity quantitative evaluation of crude oil in Tarim basin Tahe oil field;
FIG. 5 is a result of the maturity division of crude oil filled in different periods in a Tarim basin Tahe oil field;
FIG. 6 shows calibration results of the filling time of crude oil filling in different periods of the Tarim basin Tahe oil field.
Detailed Description
Various exemplary embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the first embodiment, as shown in fig. 1, a method for determining oil and gas filling time by using maturity for crude oil in a tahe oilfield comprises the following specific steps:
after the information of the hydrocarbon source rocks in the research area is collected, if only 1 set of hydrocarbon source rocks exist, the subsequent step 6 is not needed; if there are multiple sets of source rocks, the subsequent step 6 is required. Firstly, heavy oil and super-heavy oil in a crude oil sample are pretreated, namely, excessive chromatographically pure hexane is used for dissolving the oil sample, the dissolved oil sample is placed in an ultrasonic oscillator to be vibrated for more than 5min, asphaltene is filtered out, then the filtered oil sample is subjected to rotary evaporation at the temperature of 30 ℃, and residual oily matters are collected to be used as subsequent analysis samples. In this step, if the oil sample is condensate oil or normal oil, no pretreatment is required.
and (3) smearing the crude oil on a chloroform-cleaned and dried glass sheet, quickly covering the glass sheet with another glass sheet which is treated in the same way to uniformly distribute the crude oil on the glass sheet, and then carrying out fluorescence spectrum test to obtain the fluorescence spectrum of the crude oil.
performing online analysis of GC-MS (gas chromatography-mass spectrometry) of crude oil fluorescence spectrum grading to obtain geochemical parameters of the collected crude oil sample, and calculating the maturity of the crude oil sample by using the maturity parameters; when the geochemical characteristics of the sample are analyzed by GC-MS, a 7890 gas chromatograph of Agilent, America and a 5975C mass spectrometer are used for carrying out chromatographic-mass spectrometric (GC-MS) analysis and identification on saturated hydrocarbon and aromatic hydrocarbon compounds of the sample. The column model was DB-5MS, 60 m.times.0.25 mm.times.0.25 μm (J & W Scientific, Folsom, Calif., USA). The carrier gas was helium (99.999%); the flow rate of the carrier gas is 1 ml/min; the temperature of a sample inlet is 300 ℃, the temperature of an ion source (EI) is 230 ℃, the temperature of a quadrupole rod is 150 ℃, the temperature of a transmission line is 280 ℃, a full scanning mode is adopted, and the scanning range is 50-550 amu; electron bombardment energy of-70 eV was used.
The method comprises the steps of utilizing GC-MS (gas chromatography-mass spectrometry) online analysis of crude oil fluorescence spectrum grading to obtain geochemical data of crude oil, wherein the geochemical data comprises peak areas of methyl phenanthrene series (3-P, 2-P, 9-P and 1-P) and dimethyl dibenzothiophene series (2,4-DMDBT and 1,4DMDBT) compounds, calculating two maturity parameters F1 and K2,4 according to the following formula, and further calculating the maturity Ro:
F1＝(3-P+2-P)/(3-P+2-P+9-P+1-P) (1)，
K2,4＝2,4-DMDBT/1,4DMDBT (2)，
Ro1＝2.598*F1-0.2749 (3)，
Ro2＝0.35*K2,4+0.46 (4)，
Ro＝(Ro1+Ro2)/2 (5)，
wherein Ro ranges from 0.5% to 1.5%.
the fluorescence spectrum parameters obtained by the crude oil fluorescence test comprise lambda max and QF535, wherein lambda max is the wavelength corresponding to the maximum intensity of the crude oil fluorescence spectrum, and the parameter QF535 is SA/SBIn which S isAIs the area enclosed by the wavelengths 720nm and 535nm, SBFor the areas bounded by the wavelengths 535nm and 420nm, as shown in FIGS. 2 and 3, fitting relationships between λ max and the maturity Ro and between QF535 and the maturity Ro are established, respectively, and the correlation coefficient R is calculated2Establishing a relation chart between the fluorescence spectrum parameters and the maturity of the crude oil as shown in figure 4 when the fluorescence spectrum parameters are more than 0.8;
making a fluorescence spectrum parameter-maturity quantitative evaluation chart according to the relation between the crude oil fluorescence spectrum parameter and the maturity, and then making the fluorescence spectrum parameter-maturity quantitative evaluation chart for quantitatively evaluating the crude oil maturity;
the fluorescence spectrum parameter lambda max of the crude oil is gradually reduced along with the increase of the maturity and is linearly related to the maturity, and QF535 is continuously reduced along with the increase of the maturity and is exponentially related to the maturity.
Step 5, selecting and cleaning reservoir rock and grinding an oil inclusion:
and cleaning the collected reservoir rock sample of the Tahe oil field by using deionized water, airing the cleaned rock sample, and preparing the aired rock sample into a double-sided polishing sheet with the thickness of 100 mu m.
Step 6, distinguishing lithofacies characteristics of the oil inclusion in different periods and measuring fluorescence spectrum
The thin slices were observed under a fluorescence microscope and the fluorescence characteristics were used to determine the presence of a single-stage secondary oil inclusion in the rock sample. Crushing the rock sample with the oil inclusion in the same period, then using dichloromethane to shake and clean the surfaces of the crushed rock particles, then using an agate mortar to grind the oil inclusion particles, and finally using trichloromethane to extract the oil inclusion particles. Performing on-machine test after the extract is separated, comparing with geochemical data of the hydrocarbon source rock, judging the homology of the two, and determining the source of oil gas of different periods; the fluorescence test instrument was a NIKON microscope equipped with a Maya2000Pro micro fluorescence spectrometer.
And 7, collecting information of the source rock, wherein the collected information of the source rock comprises measured drilling data, maturity data of the source rock, heat flow data for reference and formation degradation thickness data. Basin simulation technology is used for recovering maturity history of various sets of source rocks in the research area. Crushing a rock sample of a single-stage secondary oil inclusion according to the second fluorescence spectrum parameter, extracting inclusion oil, performing geochemical comparison, and determining an oil gas source;
and 8, calibrating the maturity of the oil gas filled in different periods on the source rock maturity history, so as to determine the oil gas filling time in each period, and obtaining the quantitative evaluation result of the oil gas filling time in different periods as shown in fig. 5.
The main working principle of the invention is as follows: the crude oil can emit fluorescence with a certain wavelength under the irradiation of ultraviolet light, the fluorescence of the crude oil can show blue shift along with the increase of the maturity, the blue shift of the fluorescence is related to the change of components of crude oil families and aromatic compounds after the maturity is increased, and the change trend provides a new idea for determining the maturity of oil and gas. Therefore, a quantitative relation is established according to the fluorescence spectrum parameters and the maturity of the crude oil measured, and the maturity of the oil gas filled in different periods can be rapidly obtained by combining the lithology characteristics of the oil gas inclusion. The source rock is increasing continuously in the process of thermal evolution and is an irreversible process. Therefore, the basin simulation technology can be utilized to recover the maturity history of the source rocks in the research area, the maturity of the oil gas filled in each stage is combined, the oil gas filling time in each stage can be rapidly determined, and the interference of multi-solution is effectively avoided. .
The invention has the advantages that:
1. the method optimizes the selection of maturity evaluation parameters, and solves the problems that the conventional maturity parameters depend on oil sources and the evaluation range is limited. The method selects the related ratio of the aromatic hydrocarbon compounds closely related to the fluorescence generated by the crude oil as the maturity parameter, is more reasonable, is more accurate in evaluating the maturity of oil gas filled at different periods, and has wider application range.
2. In the method, two parameters of lambda max and QF535 are used for fitting with Ro respectively in the aspect of selecting spectral parameters, so that the accuracy of maturity evaluation is improved.
3. The method combines the maturity of oil gas filling at each stage and the history of the maturity of the source rock recovered by using the basin simulation technology to calibrate the oil gas filling time at each stage more accurately, and solves the problem of multi-solution of calibrating the oil gas filling time by using the inclusion temperature measurement method.
The above description is only exemplary of the present invention and should not be taken as limiting the invention, as any modification, equivalent replacement, or improvement made within the spirit and scope of the present invention should be included in the present invention.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
Claims (10)
1. A method for determining hydrocarbon charge time using maturity, comprising:
collecting hydrocarbon source rock information and preprocessing an oil sample;
performing fluorescence test on the pretreated oil sample to obtain a first fluorescence spectrum parameter;
acquiring geochemical data of the oil sample by utilizing GC-MS (gas chromatography-Mass spectrometer) on-line analysis according to the first fluorescence spectrum parameter;
calculating to obtain a maturity parameter of the oil sample according to the geochemical data, and calculating to obtain the maturity of the oil sample according to the maturity parameter;
according to the first fluorescence spectrum parameter and the maturity of the oil sample, a fluorescence spectrum parameter-maturity quantitative evaluation chart is manufactured;
selecting a reservoir rock sample and manufacturing an oil inclusion;
distinguishing lithofacies characteristics of the oil inclusion of different periods, performing fluorescence test to obtain a second fluorescence spectrum parameter, and evaluating the oil and gas maturity of the oil inclusion of different periods by using the fluorescence spectrum parameter-maturity quantitative evaluation chart;
crushing a rock sample of a single-stage secondary oil inclusion according to the second fluorescence spectrum parameter, extracting inclusion oil, comparing geochemical data and determining an oil gas source;
recovering the maturity history of the source rocks according to maturity data in the source rock information;
and calibrating the oil and gas maturity of the oil inclusion in different periods on the history of the maturity of the hydrocarbon source rock, so as to determine the oil and gas filling time in each period.
2. The method for determining hydrocarbon charge time using maturity of claim 1 wherein said pre-processing the oil sample comprises:
if the oil sample is a heavy oil, and/or, an extra heavy oil:
dissolving heavy oil and/or extra heavy oil with chromatographically pure hexane;
placing the dissolved oil sample in an ultrasonic oscillator for oscillation, thereby filtering out asphaltene;
and rotationally evaporating the oil sample with the asphaltene filtered out at a preset temperature, and collecting residual oily substances to be used as an oil sample for subsequent analysis.
3. The method for determining hydrocarbon charge time using maturity of claim 1 wherein said distinguishing lithology characteristics of said oil inclusions at different times and performing fluorescence testing comprises:
and smearing the oil sample on a glass sheet which is cleaned and dried by chloroform, quickly covering the glass sheet with another glass sheet which is subjected to the same treatment process to ensure that the oil sample is uniformly distributed on the glass sheet, and then carrying out fluorescence spectrum test by using the glass sheet.
4. The method for determining hydrocarbon charge time using maturity of claim 1 wherein said first fluorescence spectrum parameter comprises:
the wavelength lambda max corresponding to the maximum intensity of the fluorescence spectrum of the oil sample, and the spectral parameter QF535, wherein:
QF535＝SA/SB；
wherein SAIs the area enclosed by the wavelengths 720nm and 535nm, SBThe area bounded by the wavelengths 535nm and 420 nm.
5. The method for determining hydrocarbon charge time using maturity of claim 1 wherein said selecting reservoir rock and making oil inclusions comprises:
and cleaning the reservoir rock sample by using deionized water, airing the cleaned rock sample, and manufacturing the aired rock sample into a double-sided polishing sheet with the preset thickness.
6. The method for determining hydrocarbon charge time using maturity of claim 4 wherein said wavelength λ max is linearly related to said maturity and gradually decreases as said maturity increases.
7. The method of claim 4, wherein the spectral parameter QF535 is exponentially related to the maturity and decreases as the maturity increases.
8. The method of claim 4, wherein the step of making a fluorescence spectrum parameter-maturity quantitative evaluation chart based on the first fluorescence spectrum parameter and the maturity of the oil sample comprises:
and respectively establishing a relational expression between the wavelength lambda max and the maturity and between the spectral parameter QF535 and the maturity, and establishing a relational chart between the crude oil fluorescence spectral parameter and the maturity according to the relational expression.
9. The method of claim 1, wherein the fragmenting the rock sample of single-stage secondary oil inclusions according to the second fluorescence spectrum parameter comprises:
selecting a rock sample with a contemporary oil inclusion:
crushing the rock sample, and then using dichloromethane to shake and clean the surfaces of the crushed rock particles;
grinding the rock particles after shaking and cleaning:
the ground rock particles were extracted with chloroform.
10. A computer storage medium having stored thereon a method of determining hydrocarbon charge time using maturity as claimed in any one of claims 1 to 9.
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