CN106770278B - A method of determining sandstone reservoir middle ancient times Diagenesis fluids source - Google Patents
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Abstract
The invention belongs to oil and gas explorations and development technique field, it is related to a kind of method for determining sandstone reservoir middle ancient times Diagenesis fluids source, by the quartz secondary to micron level in sandstone reservoir in the detection of saline inclusion homogenization temperature and when to quartz secondary oxygen isotope in-situ micro area detection, determine the temperature and oxygen isotope of the ancient Diagenesis fluids of precipitating quartz cement during reservoir buries, and time and fluid origin that ancient Diagenesis fluids occur can be determined, solve the problems, such as that Gu Diagenesis fluids source relevant to quartz cement is determined in oil-gas bearing basin clastic reservoir rock.
Description
Technical field
The invention belongs to oil and gas explorations and development technique field, specifically, being related to one kind determines sandstone reservoir
The method in middle ancient times Diagenesis fluids source.
Background technique
During oil-gas bearing basin burial diagenesis, mineral dissolution effect and cementation are to reservoir quality evolution tool in basin
There is important control action.Quartz cement is one of cement common in rich arkose reservoir, precipitation process usually companion
It is a kind of by-product of feldspar solution effect with the dissolution of the aluminium silicate minerals such as feldspar.The secondary pore that feldspar solution is formed
It can be effectively improved reservoir quality, but hole cannot save ancient Diagenesis fluids information.Quartz cement with precipitating can have
Effect ground saves the oxygen isotope information of fluid, this kind of isotope can be efficiently used for the identification of fluid origin, therefore, studies stone
The forming process of English cement and related ancient Diagenesis fluids feature, also can effectively disclose dissolution feldspar-precipitating in sandstone reservoir
The property of the ancient Diagenesis fluids of quartz and source.
However, the size of the quartz cement in sandstone reservoir usually only reaches micro-meter scale, as a kind of important stone
The thickness of English cement, quartz secondary side is generally less than 80um, it has been carried out with other rock compositions or clastic quitz particle
Fully separating purification is difficult, and separating-purifying complex steps, separating effect is undesirable, is often associated with that there are many miscellaneous after separation
Matter, leads to that there has been no the methods for effectively identifying relative ancient Diagenesis fluids source.
Summary of the invention
The present invention can not effectively identify the above-mentioned deficiencies such as ancient Diagenesis fluids source for of the existing technology, provide one kind
Determine the method in sandstone reservoir middle ancient times Diagenesis fluids source, can high-resolution, accurately identification contain oil-and-gas basin clast
The source of Gu Diagenesis fluids relevant to quartz cement in rock stratum, has directive significance for the prediction of reservoir quality.
The technical scheme is that a kind of method for determining sandstone reservoir middle ancient times Diagenesis fluids source, contains following step
It is rapid:
Take sandstone reservoir cores to grind with a thickness of 100um twin polishing petrographic thin section;
The quartz secondary side of petrographic thin section is found and identified using ordinary optical microscope and cathodoluminescence microscope, is utilized
The saline inclusion and hydrocarbon inclusion in quartz secondary side are found and identified to fluorescence microscope;
Salt water in selected quartz secondary side is wrapped up using optical microscopy and cold and hot, microscope matched with its
Body homogenization temperature is detected, the temperature of Gu Diagenesis fluids when obtaining quartz precipitating;
Using micro- region drilled through containing quartz secondary side in petrographic thin section, multiple test samples are obtained, by test sample
It is embedded into transparent resin rubber column gel column jointly with standard quartz sample, is fabricated to rubber column gel column sample, rubber column gel column sample surfaces is polished
Processing;
Observation photograph is carried out to the rubber column gel column sample after polishing treatment using ordinary optical microscope and cathodoluminescence microscope
And picture mosaic, the preliminary position chosen on quartz secondary side for the detection of in-situ micro area oxygen isotope;
The quartz secondary border region to be analyzed is selected using secondary ion microprobe mass spectrometer, is selected using ion beam bombardment
Quartz secondary border region carries out the test of standard quartz sample and quartz secondary side in-situ micro area oxygen isotope, obtains quartz and adds
Big side oxygen isotope information;
By quartz secondary in saline inclusion homogenization temperature and situ oxygen Isotope Information when quartz secondary mutually tie and, throw
It is obtained on quartz mineral oxygen isotope-fluid Oxygen Isotope Fractionation between Quartz figure in quartzy precipitation process under shadow to condition of different temperatures
The oxygen isotope value that the ancient Diagenesis fluids of quartz cement must be precipitated judges the source of ancient Diagenesis fluids according to oxygen isotope value.
As preferred design, in the above-mentioned method for determining sandstone reservoir middle ancient times Diagenesis fluids source, the test sample is
The wafer sample of diameter 3mm, the diameter of the transparent resin rubber column gel column are 2.5cm.
As preferred design, in the above-mentioned method for determining sandstone reservoir middle ancient times Diagenesis fluids source, according to mineral list polarisation,
Orthogonal optical, reflected light and cathodoluminescence feature, it is preliminary to choose the position that situ oxygen isotope detection is used on quartz secondary side.
As preferred design, in the above-mentioned method for determining sandstone reservoir middle ancient times Diagenesis fluids source, the beam of the ion beam
Spot diameter is 15um.
As preferred design, in the above-mentioned method for determining sandstone reservoir middle ancient times Diagenesis fluids source, the petrographic thin section
At least grind one.
Compared with prior art, the beneficial effects of the present invention are:
(1) a kind of method for determining sandstone reservoir middle ancient times Diagenesis fluids source provided by the invention, by sandstone reservoir
The quartz secondary of middle micron level in the detection of saline inclusion homogenization temperature and when to quartz secondary oxygen isotope high score
Resolution, the detection of high-precision in-situ micro area effectively determine the Gu of precipitating quartz cement during reservoir buries into rock flow
The temperature and oxygen isotope of body, and time and fluid origin that ancient Diagenesis fluids occur can be determined, solve oil-gas bearing basin
Gu Diagenesis fluids source relevant to quartz cement determines problem in clastic reservoir rock.
(2) a kind of method for determining sandstone reservoir middle ancient times Diagenesis fluids source provided by the invention, principle is simple, practicability
And strong operability, it has effectively achieved and really determines ancient Diagenesis fluids property by spontaneous diagenesis mineral spirits on reservoir micro-scale
And source, there is highly important directive significance to the prediction of reservoir quality.
Detailed description of the invention
Fig. 1 is a kind of flow chart for the method for determining sandstone reservoir middle ancient times Diagenesis fluids source of the present invention.
Fig. 2 is that Bohai gulf basin Shengtuo region in Dongying depression 720 well depths that stick together are in the specific embodiment of the invention 1
At 3535.0m Quartz Crystals In Sandstone Reservoirs increase while and when quartz secondary in saline inclusion characteristic pattern.
Fig. 3 is that Bohai gulf basin Shengtuo region in Dongying depression 720 well depths that stick together are in the specific embodiment of the invention 1
Sandstone reservoir quartz secondary side saline inclusion homogenization temperature distribution histogram at 3535.0m.
Fig. 4 is that Bohai gulf basin Shengtuo region in Dongying depression 720 well depths that stick together are in the specific embodiment of the invention 1
Quartz particles and quartz secondary side Secondary Ion Mass Spectrometry microcell oxygen isotope test point characteristic pattern when reflected light at 3535.0m.
Fig. 5 is that Bohai gulf basin Shengtuo region in Dongying depression 720 well depths that stick together are in the specific embodiment of the invention 1
Lu Yuan quartz particles and spontaneous quartz secondary side Oxygen Isotope Distribution Characteristics figure in sandstone reservoir at 3535.0m.
Fig. 6 is quartz mineral oxygen isotope-in precipitation process quartzy under condition of different temperatures in the specific embodiment of the invention 1
Fluid Oxygen Isotope Fractionation between Quartz and victory stick together area stick together 720 well depths be 3535.0m locate Quartz Crystals In Sandstone Reservoirs increasing side in flow
The O isotopes figure of body inclusion enclave homogenization temperature and the ancient Diagenesis fluids of quartz secondary side oxygen isotope data reflection.
Fig. 7 is that high 62 well depth in Nanpu Sag of Bohai Bay Basin Gaoliu area is 3676.0m in the specific embodiment of the invention 2
Locate Quartz Crystals In Sandstone Reservoirs increase while and when quartz secondary in saline inclusion characteristic pattern.
Fig. 8 is that high 62 well depth in Nanpu Sag of Bohai Bay Basin Gaoliu area is 3676.0m in the specific embodiment of the invention 2
Locate sandstone reservoir quartz secondary side saline inclusion homogenization temperature distribution histogram.
Fig. 9 is that high 62 well depth in Nanpu Sag of Bohai Bay Basin Gaoliu area is 3676.0m in the specific embodiment of the invention 2
Locate quartz particles and quartz secondary side Secondary Ion Mass Spectrometry microcell oxygen isotope test point characteristic pattern when reflected light.
Figure 10 is that high 62 well depth in Nanpu Sag of Bohai Bay Basin Gaoliu area is in the specific embodiment of the invention 2
Lu Yuan quartz particles and spontaneous quartz secondary side Oxygen Isotope Distribution Characteristics figure in sandstone reservoir at 3676.0m.
Figure 11 is the same position of quartz mineral oxygen in precipitation process quartzy under condition of different temperatures in the specific embodiment of the invention 2
High 62 well depth of element-fluid Oxygen Isotope Fractionation between Quartz and Gaoliu area is fluid in quartz secondary side in reservoir at 3676.0m
The O isotopes figure of inclusion enclave homogenization temperature and the ancient Diagenesis fluids of quartz secondary side oxygen isotope data reflection.
In figure, Q, quartz particles, Qa, quartz secondary side.
Specific embodiment
In the following, the present invention is specifically described by illustrative embodiment.
The embodiment of the invention provides a kind of methods for determining sandstone reservoir middle ancient times Diagenesis fluids source, contain following step
It is rapid:
Take sandstone reservoir cores to grind with a thickness of 100um twin polishing petrographic thin section;
The quartz secondary side of petrographic thin section is found and identified using ordinary optical microscope and cathodoluminescence microscope, is utilized
The saline inclusion and hydrocarbon inclusion in quartz secondary side are found and identified to fluorescence microscope;
Salt water in selected quartz secondary side is wrapped up using optical microscopy and cold and hot, microscope matched with its
Body homogenization temperature is detected, the temperature of Gu Diagenesis fluids when obtaining quartz precipitating;
Using micro- region drilled through containing quartz secondary side in petrographic thin section, multiple test samples are obtained, by test sample
It is embedded into transparent resin rubber column gel column jointly with standard quartz sample, is fabricated to rubber column gel column sample, rubber column gel column sample surfaces is polished
Processing;
Observation photograph is carried out to the rubber column gel column sample after polishing treatment using ordinary optical microscope and cathodoluminescence microscope
And picture mosaic, the preliminary position chosen on quartz secondary side for the detection of in-situ micro area oxygen isotope;
The quartz secondary border region to be analyzed is selected using secondary ion microprobe mass spectrometer, is selected using ion beam bombardment
Quartz secondary border region carries out the test of standard quartz sample and quartz secondary side in-situ micro area oxygen isotope, obtains quartz and adds
Big side oxygen isotope information;
By quartz secondary in saline inclusion homogenization temperature and situ oxygen Isotope Information when quartz secondary mutually tie and, throw
It is obtained on quartz mineral oxygen isotope-fluid Oxygen Isotope Fractionation between Quartz figure in quartzy precipitation process under shadow to condition of different temperatures
The oxygen isotope value that the ancient Diagenesis fluids of quartz cement must be precipitated judges the source of ancient Diagenesis fluids according to oxygen isotope value.
Due to often developing " dirt line " between quartz particles and quartz secondary side, pass through the transmission optical mode of ordinary optical microscope
Formula or reflected light pattern distinguish quartz particles and quartz secondary side using " dirt line ", under cathodoluminescence microscope, quartz
Grain and quartz secondary side typically exhibit different colors, and quartz particles are pewter, and quartz secondary side is grey black or brown, benefit
With cathodoluminescence microscope can effective district divide quartz particles and quartz secondary side.Therefore, ordinary optical microscope and yin are utilized
Pole illuminating microscope effectively can find and identify the quartz secondary side of petrographic thin section.
Since under fluorescence microscope, black, hydro carbons packet is still presented under fluorescence irradiation in the reaction of saline inclusion unstressed configuration
It wraps up in body and brown color, brown, light blue etc. is presented under fluorescence irradiation, therefore, effectively can find and reflect using fluorescence microscope
It Chu not saline inclusion and hydrocarbon inclusion.
In an embodiment of the present invention, the test sample can use different size and shape, specifically can be according to reality
Border requirement of experiment is chosen, and the diameter of the transparent resin rubber column gel column can be determined according to the quantity and size of test sample.?
In one embodiment of the present invention, the test sample is the wafer sample of diameter 3mm, and the diameter of the transparent resin rubber column gel column is
2.5cm。
In a preferred embodiment, according to mineral list polarisation, orthogonal optical, reflected light and cathodoluminescence feature, just
Step chooses the position that situ oxygen isotope detection is used on quartz secondary side.
In an embodiment of the present invention, the beam spot diameter, of the ion beam can be according to selected quartz secondary border region
Size is selected.In a preferred embodiment, the beam spot diameter, of the ion beam is 15um.
In an embodiment of the present invention, the petrographic thin section at least grinds one, can grind one, two, three, four
It opens, five, six, seven, eight.In a preferred embodiment, petrographic thin section grinds three or five.
In an embodiment of the present invention, the secondary ion microprobe mass spectrometer uses Camera IMS-1280 secondary ion
Microprobe mass spectrometer.
Embodiment 1: 720 well depths are sticked together as 3535.0m sandstone with Eastern China Bohai gulf basin Shengtuo region in Dongying depression
For reservoir, it is further detailed in conjunction with attached drawing.
A method of determining sandstone reservoir middle ancient times Diagenesis fluids source referring to Fig. 1 and contain following steps:
Step 1: win victory stick together area stick together 720 well depths be 3535.0m at rock core, grind with a thickness of 100um twin polishing
Petrographic thin section three is opened.
Step 2: the quartz secondary of petrographic thin section is found and identified using ordinary optical microscope and cathodoluminescence microscope
The saline inclusion and hydrocarbon inclusion in quartz secondary side are found using fluorescence microscope and identified in side.
Referring to fig. 2, given in Fig. 2 victory stick together regional Quartz Crystals In Sandstone Reservoirs increase while and when quartz secondary in salt water package
Body characteristics.
Step 3: using optical microscopy and cold and hot, microscope matched with its to the salt in selected quartz secondary side
Water inclusion enclave homogenization temperature is detected, the temperature of Gu Diagenesis fluids when obtaining quartz precipitating.The inspection of saline inclusion homogenization temperature
Result is surveyed referring to Fig. 3, regional sandstone reservoir sticks together 720 well depths as salt in quartz secondary side at 3535.0m from the figure 3, it may be seen that victory sticks together
Water inclusion enclave homogenization temperature is mostly in 105~125 DEG C.
Step 4: using micro- region drilled through containing quartz secondary side in petrographic thin section, the disk of 5 diameter 3mm is obtained
5 wafer samples and standard quartz sample are embedded into the transparent resin rubber column gel column of diameter 2.5cm by sample jointly, make plastic
Column sample is processed by shot blasting rubber column gel column sample surfaces.The standard quartz sample is quartz particles.
Step 5: the rubber column gel column sample after polishing treatment is seen using ordinary optical microscope and cathodoluminescence microscope
Photograph and picture mosaic are examined, it is preliminary to choose on quartz secondary side according to mineral list polarisation, orthogonal optical, reflected light and cathodoluminescence feature
Position for situ oxygen isotope detection.
Step 6: the quartz secondary border area to be analyzed is selected using Camera I MS-1280 secondary ion microprobe mass spectrometer
Domain carries out quartz particles and quartz secondary using the quartz secondary border region that the ion beam bombardment that beam spot diameter, is 15um is selected
The test of side original position oxygen isotope obtains quartz secondary side oxygen isotope information.Quartz particles and quartz secondary side in-situ micro area
Referring to fig. 4, the arrow in Fig. 4 indicates analysis site position to the feature of oxygen isotope test point.Oxygen isotope test result is referring to figure
5, as shown in Figure 5, wins the regional sandstone reservoir that sticks together and stick together 720 well depths as oxygen isotope range master in quartz secondary side at 3535.0m
It will be between 20 ‰~24 ‰.
Step 7: by quartz secondary in saline inclusion homogenization temperature and situ oxygen Isotope Information phase when quartz secondary
Knot and, project under condition of different temperatures quartz mineral oxygen isotope-fluid Oxygen Isotope Fractionation between Quartz in quartzy precipitation process
On figure, referring to Fig. 6, the oxygen isotope value of the ancient Diagenesis fluids of precipitating quartz cement is obtained between+0 ‰~+4 ‰, according to oxygen
Isotope value judges fluid in basin that the source of ancient Diagenesis fluids is transformed for diagenesis, unrelated with atmospheric water.
Embodiment 2: being sandstone at 3676.0m with high 62 well depth in Eastern China Nanpu Sag of Bohai Bay Basin Gaoliu area
For reservoir, it is further detailed in conjunction with attached drawing.
A method of determining sandstone reservoir middle ancient times Diagenesis fluids source referring to Fig. 1 and contain following steps:
Step 1: taking high 62 well depth in Gaoliu area is rock core at 3676.0m, is ground with a thickness of 100um twin polishing
Petrographic thin section five is opened.
Step 2: the quartz secondary of petrographic thin section is found and identified using ordinary optical microscope and cathodoluminescence microscope
The development period and feature on quartz secondary side are specified in side, and the salt water in quartz secondary side is found and identified using fluorescence microscope
Inclusion enclave and hydrocarbon inclusion.Referring to Fig. 7, Gaoliu area Quartz Crystals In Sandstone Reservoirs are given in Fig. 7 and increase side and quartz secondary
Saline inclusion feature in side.
Step 3: using optical microscopy and cold and hot, microscope matched with its to the salt in selected quartz secondary side
Water inclusion enclave homogenization temperature is detected, the temperature of Gu Diagenesis fluids when obtaining quartz precipitating.The inspection of saline inclusion homogenization temperature
Result is surveyed referring to Fig. 8, as shown in Figure 8, sandstone reservoir high 62 well depth in Gaoliu area is salt water in quartz secondary side at 3676.0m
Inclusion enclave homogenization temperature is mostly in 95~115 DEG C.
Step 4: using micro- region drilled through containing quartz secondary side in petrographic thin section, the disk of 2 diameter 3mm is obtained
2 wafer samples and standard quartz sample are embedded into the transparent resin rubber column gel column of diameter 2.5cm by sample jointly, make plastic
Column sample is processed by shot blasting rubber column gel column sample surfaces.The standard quartz sample is quartz particles.
Step 5: the rubber column gel column sample after polishing treatment is seen using ordinary optical microscope and cathodoluminescence microscope
Photograph and picture mosaic are examined, it is preliminary to choose on quartz secondary side according to mineral list polarisation, orthogonal optical, reflected light and cathodoluminescence feature
Position for situ oxygen isotope detection.
Step 6: the quartz secondary border area to be analyzed is selected using Camera IMS-1280 secondary ion microprobe mass spectrometer
Domain carries out quartz particles and quartz secondary using the quartz secondary border region that the ion beam bombardment that beam spot diameter, is 15um is selected
The test of side original position oxygen isotope obtains quartz secondary side oxygen isotope information.Quartz particles and quartz secondary side in-situ micro area
For the feature of oxygen isotope test point referring to Fig. 9, the arrow in Fig. 9 indicates analysis site position.Oxygen isotope test result is referring to figure
10, as shown in Figure 10, sandstone reservoir high 62 well depth in Gaoliu area is oxygen isotope range master in quartz secondary side at 3676.0m
It will be between 16 ‰~20 ‰.
Step 7: by quartz secondary in saline inclusion homogenization temperature and situ oxygen Isotope Information phase when quartz secondary
Knot and, project under condition of different temperatures quartz mineral oxygen isotope-fluid Oxygen Isotope Fractionation between Quartz in quartzy precipitation process
On figure, referring to Figure 11, the oxygen isotope value of the ancient Diagenesis fluids of precipitating quartz cement is obtained between -6 ‰~-3 ‰, according to oxygen
Isotope value judges the source of ancient Diagenesis fluids for the Diagenesis fluids being transformed strongly after metrical water penetrates into, the leaching of metrical water
Considering the growth to feldspar solution and quartz secondary side has great influence.
Embodiment provided above only with illustrating the present invention for convenience, and it is not intended to limit the protection scope of the present invention,
Technical solution scope of the present invention, person of ordinary skill in the field make various simple deformations and modification, should all include
In the above claim.
Claims (4)
1. a kind of method for determining sandstone reservoir middle ancient times Diagenesis fluids source, which is characterized in that contain following steps:
Take sandstone reservoir cores to grind with a thickness of 100um twin polishing petrographic thin section;
The quartz secondary side of petrographic thin section is found and identified using ordinary optical microscope and cathodoluminescence microscope,
The saline inclusion and hydrocarbon inclusion in quartz secondary side are found and identified using fluorescence microscope;
It is equal to the saline inclusion in selected quartz secondary side using optical microscopy and cold and hot, microscope matched with its
One temperature is detected, the temperature of Gu Diagenesis fluids when obtaining quartz precipitating;
Using micro- region drilled through containing quartz secondary side in petrographic thin section, multiple test samples are obtained, by test sample and mark
Quasi- quartz specimen is embedded into jointly in transparent resin rubber column gel column, is fabricated to rubber column gel column sample, is processed by shot blasting to rubber column gel column sample surfaces;
Observation photograph and spelling are carried out to the rubber column gel column sample after polishing treatment using ordinary optical microscope and cathodoluminescence microscope
Figure, the preliminary position chosen on quartz secondary side for the detection of in-situ micro area oxygen isotope;
The quartz secondary border region to be analyzed is selected using secondary ion microprobe mass spectrometer, the quartz selected using ion beam bombardment
Border region is increased, the test of standard quartz sample and quartz secondary side in-situ micro area oxygen isotope is carried out, obtains quartz secondary side
Oxygen isotope information;
By quartz secondary in saline inclusion homogenization temperature and situ oxygen Isotope Information combines when quartz secondary, project
It is obtained on quartz mineral oxygen isotope-fluid Oxygen Isotope Fractionation between Quartz figure in quartzy precipitation process under to condition of different temperatures
The oxygen isotope value for precipitating the ancient Diagenesis fluids of quartz cement judges the source of ancient Diagenesis fluids according to oxygen isotope value.
2. the method according to claim 1 for determining sandstone reservoir middle ancient times Diagenesis fluids source, it is characterised in that: the survey
Test agent is the wafer sample of diameter 3mm, and the diameter of the transparent resin rubber column gel column is 2.5cm.
3. the method according to claim 1 or 2 for determining sandstone reservoir middle ancient times Diagenesis fluids source, which is characterized in that root
It is preliminary to choose on quartz secondary side for oxygen isotope in situ according to mineral list polarisation, orthogonal optical, reflected light and cathodoluminescence feature
The position of detection.
4. the method according to claim 3 for determining sandstone reservoir middle ancient times Diagenesis fluids source, which is characterized in that it is described from
The beam spot diameter, of beamlet is 15um.
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CN108375497B (en) * | 2018-01-23 | 2020-03-24 | 中国科学院地质与地球物理研究所 | Preparation method of secondary ion probe sample target |
CN109060928A (en) * | 2018-07-18 | 2018-12-21 | 中国石油天然气股份有限公司 | Quantitatively judge the method and apparatus of carbonate rock cement formation and hydrocarbon charge timing |
CN111487274B (en) * | 2020-04-28 | 2020-11-13 | 中国地质大学(北京) | Quantitative calculation method for siliceous secondary enlarged edge based on cathodoluminescence technology |
CN113916880B (en) * | 2020-06-23 | 2023-12-26 | 中国石油天然气股份有限公司 | Method for determining diagenetic fluid evolution history |
CN112683984A (en) * | 2020-12-14 | 2021-04-20 | 中国科学院地质与地球物理研究所 | Comprehensive identification method for deep paleo-karst fluid |
CN114354604B (en) * | 2022-01-10 | 2023-09-08 | 西南石油大学 | Identification method of ancient deep primary minerals |
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