CN112284993A - Dolomite relay bearing type pore recognition method - Google Patents
Dolomite relay bearing type pore recognition method Download PDFInfo
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- 239000010459 dolomite Substances 0.000 title claims abstract description 221
- 229910000514 dolomite Inorganic materials 0.000 title claims abstract description 221
- 239000011148 porous material Substances 0.000 title claims abstract description 127
- 238000000034 method Methods 0.000 title claims abstract description 43
- 239000011435 rock Substances 0.000 claims abstract description 95
- 239000004568 cement Substances 0.000 claims abstract description 51
- 238000005259 measurement Methods 0.000 claims abstract description 17
- 239000011230 binding agent Substances 0.000 claims description 17
- 239000003822 epoxy resin Substances 0.000 claims description 9
- 229920000647 polyepoxide Polymers 0.000 claims description 9
- 238000005136 cathodoluminescence Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 7
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 238000004020 luminiscence type Methods 0.000 claims description 5
- 238000010191 image analysis Methods 0.000 claims description 4
- 238000004458 analytical method Methods 0.000 description 8
- 239000011159 matrix material Substances 0.000 description 5
- 235000019738 Limestone Nutrition 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 239000006028 limestone Substances 0.000 description 4
- 241000446313 Lamella Species 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 241001424413 Lucia Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002056 binary alloy Inorganic materials 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000009616 inductively coupled plasma Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000000608 laser ablation Methods 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000004626 scanning electron microscopy Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
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- G01N27/628—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode using heat to ionise a gas and a beam of energy, e.g. laser enhanced ionisation
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Abstract
The invention provides a dolomite relay bearing type pore identification method. The method comprises the following steps: obtaining a dolomite rock sample for isotope dating; the dolomite rock sample for isotope year measurement simultaneously has dolomite surrounding rock and the earliest stage dolomite cement filled in pores, and is not altered; determining isotope year measurement by using dolomite surrounding rocks in the dolomite rock sample and the earliest stage dolomite cement filled in the pores, and obtaining the age of the dolomite surrounding rocks and the age of the earliest stage dolomite cement filled in the pores in the isotope year measurement; and if the age difference between the age of the dolomite surrounding rock and the age of the earliest stage of dolomite cement filled in the pores does not exceed the age difference threshold value, the pores of the dolomite are inherited. According to the method, a quantitative means is provided for identifying the bearing type pores in the dolomite through objective comparison of ages of the surrounding rock dolomite and the cement dolomite.
Description
Technical Field
The invention belongs to the technical field of rock analysis, and particularly relates to a dolomite relay bearing type pore recognition method.
Background
The identification of the cause of the dolomite pore has important guiding significance for oil and gas exploration. In deep underground conditions, dolomites are generally more porous than limestone, making them important hydrocarbon reservoirs (Ehrenberg and Nadeau, 2005). Dolomites in geological history are mostly formed by dolomitic fluid cross-substitution of limestone, a process known as dolomisation. Theoretically, the reservoir space (pores) of dolomitic rock can be formed in a number of stages before (i.e., the inherited pores referred to herein) dolomization, during the dolomization process, or after dolomization (Lucia, 2004). The size and spatial distribution of the reservoirs caused by pores formed at different stages varies, and different strategies are adopted in exploration (Sun, 1992).
Although dolomite pores can form in multiple stages, recent studies have shown that even those dolomites that have undergone strong diagenesis have inherited pores that are highly or even predominantly in reservoir spaces. Comprehensive analysis of the cause types of the pore spaces of ancient and old dolomite reservoirs in Sichuan, Tarim and Ordos basins of China by Zhaowenzhi et al (2018) considers that the pores in dolomite mainly come from the sedimentary primary pores of the original rocks and partly come from the surface to generate corrosion and the buried corrosion action (Zhaowenzhi et al, the cause types, identification characteristics and reservoir space causes of dolomite rocks, < petroleum exploration and development >, volume 45, 6 th of 2018). Their references to "sediment-grown pores" and "surface erosion" are actually inherited pores referred to in the present invention. Therefore, accurate identification of the inherited pores in the dolomite is of great significance for improving the reliability of reservoir distribution prediction and reducing the risk of oil and gas exploration. The only current method for identifying the supported pores and other types of pores in dolomite is by core and lamella observation, i.e. petrological analysis, such as zhaofeng et al, which has classified the types of pores in dolomite based on the microscopic structural features (zhaofeng et al, residual structure of dolomite and the resulting classification of pores, proceedings of depositary, vol 29, No. 3, 2011). However, the petrology analysis is inevitably affected by subjective factors such as knowledge background, academic preference, work experience and the like of researchers, so that even for the same sample, different people can obtain different recognitions. In addition, in the case of old dolomite, the pores are often partially or completely filled with cement, so that the details cannot be observed under a microscope, and the subjective factors of researchers add undoubtedly further to the potential risks in practical applications.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a method capable of objectively and accurately identifying the dolomite relay bearing type pore. The method is beneficial to research on the formation cause of the dolomite pore, so that the reliability of the research result of the formation cause of the reservoir is improved, and the prediction and exploration risks of the reservoir are reduced.
In order to achieve the above object, the present invention provides a dolomite relay bearing type pore identification method, wherein the method comprises:
obtaining a dolomite rock sample for isotope dating; the isotope annual dolomite rock sample simultaneously has dolomite surrounding rocks and the earliest stage dolomite cement filled in pores, and the rock sample is not altered;
determining isotope year measurement by using dolomite surrounding rocks in the dolomite rock sample and the earliest stage dolomite cement filled in the pores, and obtaining the age of the dolomite surrounding rocks and the age of the earliest stage dolomite cement filled in the pores in the isotope year measurement;
if the age difference between the age of the dolomite surrounding rock and the age of the earliest stage of dolomite cement filled in the pores does not exceed the age difference threshold value, the pores of the dolomite are inherited pores;
wherein an age difference not exceeding the age difference threshold indicates formation at the same time period.
In the above method for identifying a dolomite relay bearing type pore, preferably, the obtaining of the dolomite rock sample for isotope dating includes:
obtaining a dolomite thin slice sample which simultaneously has dolomite surrounding rocks and the earliest stage dolomite cement filled in pores;
and (3) carrying out cathode luminescence and back scattering image analysis on the dolomite thin slice sample to judge whether the sample is altered, and if the sample is not altered, using the dolomite thin slice sample as a dolomite rock sample for isotope dating.
In the above-mentioned dolomite matrix relay supported pore identification method, preferably, the dolomite matrix sheet sample is subjected to cathodoluminescence and backscatter image analysis, and if the brightness of the cathodoluminescence annulus of the dolomite surrounding rock and the earliest stage of dolomite cement filled in the pore in the dolomite matrix sheet sample is uniform, and the backscatter images of the dolomite surrounding rock and the earliest stage of dolomite cement filled in the pore in the dolomite matrix sheet sample are flat, it is determined that the sample has not been altered. In the process, if any one of dolomite surrounding rocks in the sample and the first-stage dolomite cement filled in pores is found to be in a spot-shaped cathodoluminescence or a bright-dark area mixed phenomenon in a back scattering image, the sample is judged to be changed, is not representative, and is not used.
In the above method for identifying a dolomite relay supported pore, preferably, the obtaining a dolomite chip sample having both dolomite surrounding rocks and an earliest stage of dolomite cement filled in the pore comprises:
obtaining a sample in which the earliest stage dolomite cement is filled in the pore space and the surrounding rock is dolomite;
filling epoxy resin into the pores of the sample in which the earliest dolomite binder is filled and the surrounding rock is dolomite; the epoxy resin is filled into the pores to achieve the purpose of consolidation, so that the phenomenon that subsequent analysis cannot be carried out continuously due to the fact that cemented crystal on the wall of the pores is broken during slicing is avoided;
slicing the dolomite sample after being filled with the epoxy resin, wherein the slicing area covers the dolomite surrounding rock and the earliest dolomite binder filled in the pores, so that the dolomite slice sample simultaneously with the dolomite surrounding rock and the earliest dolomite binder filled in the pores is obtained.
In the above method for identifying a dolomite relay bearing type pore, preferably, the obtaining a sample in which the pore is filled with the earliest dolomite cement and the surrounding rock is dolomite comprises:
collecting a dolomite sample with cement on the pore wall;
analyzing the stage and type of the cementing material in the pores of the collected dolomite sample;
selecting a sample in which the earliest dolomite binder is filled in the pore space and the surrounding rock is the dolomite.
In the above method for identifying a dolomite intermediate bearing type pore, preferably, the thickness of the dolomite thin sheet sample is 80 to 100 micrometers.
In the above dolomite intermediate bearing type pore identification method, preferably, the filling of the epoxy resin is performed under vacuum at 80-85 ℃.
In one embodiment, the pore filling is performed with epoxy using a rock molder.
In one embodiment, a small sample of dolomite is isolated from the collected dolomite sample for cement stage and type analysis.
In one embodiment, the stage and type analysis of the cement in the pores is performed using scanning electron microscopy for sample observation.
In a specific embodiment, the dolomitic rock flake sample is a polished flake.
In the above method for identifying a dolomite relay supported pore, preferably, the delineating isotope is located close to the pore wall during the process of using the dolomite surrounding rock in the dolomite rock sample and the first stage dolomite cement filled in the pore; thus, the two types of the selected dolomites are ensured to be close to each other in space as much as possible, and the comparison of the final age results is convenient.
In the dolomite relay bearing type pore identification method, preferably, the isotope measurement year is a U-Pb isotope measurement year.
In the above whiteIn the cloud rock relay bearing type pore identification method, preferably, the isotope measurement year is carried out, and the calculation of each measurement point is carried out after the U-Pb isotope test is carried out207Pb/206Pb and238U/206the Pb ratios and dropping these ratios to the age obtained by the Tera-Wasserburg diagram.
In one embodiment, isotope dating is performed using a laser ablation inductively coupled plasma mass spectrometer (LA-ICP-MS).
In the above method for identifying a dolomite intermediate load-bearing type pore, preferably, the threshold value of the age difference does not exceed the sum of an error value of the age of the dolomite surrounding rock obtained by the isotope year measurement and an error value of the age of the earliest stage of the dolomite cement filled in the pore obtained by the isotope year measurement. Namely, under the condition of considering error, the age of the dolomite surrounding rock obtained by isotope dating is overlapped with the age of the dolomite cement filled in the pore space at the earliest stage obtained by isotope dating, and the ages of the dolomite surrounding rock and the dolomite cement are considered to be consistent.
In the dolomite matrix relay supported pore identification method, if the age difference between the age of the dolomite surrounding rock and the age of the earliest dolomite binder filled in the pores does not exceed the age difference threshold value, the age of the dolomite surrounding rock is consistent with that of the earliest dolomite binder in the pores, and the fact that the dolomite fluid replaces the original limestone to form surrounding rock dolomite shows that the first stage dolomite binder is deposited due to the existence of mineral crystallization space in the rock. This indicates that the dolomitic porosity is present prior to dolomisation, being inherited.
The technical scheme provided by the invention combines the petrology analysis and the isotope dating technology, and achieves the purpose of objectively and accurately identifying the bearing type pore in the dolomite through age comparison of the surrounding dolomite and the cement dolomite in the pore. In a word, the technical scheme provided by the invention provides a quantitative means for identifying the bearing type pores in the dolomite through the objective comparison of the ages of the surrounding rock dolomite and the cement dolomite. On one hand, the technical scheme provided by the invention avoids the subjective factor influence and the potential risk brought by the subjective factor influence in the process of identifying the pore cause of the dolomite by the existing microscope observation method; on the other hand, for the old dolomite, the pores are mostly filled with the cementing material partially or even completely, the existing microscope observation cannot obtain the pore structure details, and under the condition, the technical scheme provided by the invention is particularly important for accurately judging the pore cause.
Drawings
Fig. 1 is a schematic flow chart of a dolomite relay type-bearing pore identification method provided in embodiment 1 of the present invention.
Fig. 2 is a graph of a dolomite sample collected in example 1 of the present invention.
Fig. 3 is a scanning electron microscope image of a dolomite sample in example 1 of the present invention.
FIG. 4 is a cathodoluminescence image of a dolomitic rock sheet sample in example 1 of the present invention.
Fig. 5 is a back-scattered image of a dolostone sheet sample in example 1 of the present invention.
Fig. 6 is an isotope dating chart of a dolomite rock-like dolomite surrounding rock for isotope dating in example 1 of the present invention.
Figure 7 is an isotope annual map of the earliest stage dolomite cement in the porosity filled with dolomitic rock samples in isotope annual mode in example 1 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in detail and completely with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the present invention, the inherited pore refers to a reservoir space (pore) formed in dolomite before dolomisation.
In the invention, the pore space refers to a storage space of the dolomite, and comprises holes, holes and seams.
Example 1
The embodiment provides a method for identifying a bearing type pore in dolomite, which is used for identifying a bearing type pore in a binary system dolomite sample in a Sichuan basin; the method specifically comprises the following steps (the flow is shown in figure 1):
the first step is as follows: collecting a dolomite sample with cement on the pore wall;
as shown in FIG. 2, the sample was visually identified to consist of dark surrounding dolomite and white cement dolomite crystals in the pores.
The second step is that: observing the collected dolomite sample by using a scanning electron microscope to analyze the stage and type of the cementing material in the pores; selecting a sample which is filled with the earliest dolomite cement in the pore space and has the surrounding rock of the dolomite for the subsequent steps;
specifically, a small sample is separated from the collected dolomite sample, and the stage and the type of the cementing material in the pores are accurately identified by observing and photographing through a scanning electron microscope, so that the result is shown in figure 3, the first stage cementing material in the pores is also the only first stage cementing material, namely dolomite, and the sample meets the requirements; and selecting a sample in which the earliest stage dolomite cement is filled in the pore space and the surrounding rock is the dolomite for subsequent steps.
The third step: filling epoxy resin into the pores of a sample with the earliest dolomite binder and the dolomite as the surrounding rock in vacuum at 80 ℃ by using a rock casting instrument; slicing the dolomite sample after being filled with the epoxy resin, wherein the slicing area covers the dolomite surrounding rock and the earliest dolomite binder filled in the pores, so as to prepare the dolomite slice sample simultaneously with the dolomite surrounding rock and the earliest dolomite binder filled in the pores; the dolomitic sheet sample was a polished sheet with a thickness of 100 microns.
The fourth step: observing the dolomite thin slice sample by using a cathode luminescence and back scattering electron microscope, analyzing a cathode luminescence and back scattering image to judge whether the sample is altered, and if the sample is not altered, taking the dolomite thin slice sample as a dolomite rock sample for isotope year measurement;
if the brightness of cathode luminescence annulus of the dolomite surrounding rock and the earliest stage dolomite binder filled in the pore in the dolomite thin slice sample is uniform, and the backscattering image of the dolomite surrounding rock and the earliest stage dolomite binder filled in the pore in the dolomite thin slice sample is straight, judging that the sample is not altered;
if any one of the dolomite surrounding rocks and the dolomite binder filled in the pores in the earliest stage in the dolomite thin sheet sample is in spot cathodoluminescence or has a bright and dark area mixed phenomenon in a back scattering image, the sample is judged to be altered, is not representative and is not used;
as shown in fig. 4, the cathodoluminescence annulus of the dolomitic rock sheet sample is distinct and uniform in brightness; as shown in fig. 5, the back-scattered image of the dolomitic rock lamella sample is flat and regular, indicating that the dolomitic rock lamella sample has not undergone the post-alteration and can be used for the subsequent steps.
The fifth step: carrying out U-Pb isotope dating year on the dolomite surrounding rock in the dolomite rock sample and the earliest dolomite cement filled in the pores by using the delineation isotope dating year to obtain the age of the dolomite surrounding rock and the age of the earliest dolomite cement filled in the pores; wherein,
calculating the number of each measuring point after the isotope year measurement is carried out and the U-Pb isotope test is carried out207Pb/206Pb and238U/206the Pb ratios are calculated and the ratios are calculated to the age obtained by the Tera-Wasserburg diagram;
as shown in FIGS. 6 and 7, the age of the dolomite wall rock was 233.8 + -6.4 Ma, and the age of the earliest stage of dolomite cement packed in the pores was 228 + -10 Ma.
And a sixth step: if the age difference between the age of the dolomite surrounding rock and the age of the earliest stage of dolomite cement filled in the pores does not exceed the age difference threshold value, the pores of the dolomite are inherited pores; wherein an age difference not exceeding an age difference threshold indicates formation at the same time period;
the ages of the dolomite surrounding rock and the earliest stage dolomite cement filled in the pores are 233.8 +/-6.4 Ma and 228 +/-10 Ma respectively;
the age difference threshold is the sum of an error value of the age of the dolomite surrounding rock obtained by isotope year measurement and an error value of the age of the earliest stage of the dolomite cement filled in the pores obtained by isotope year measurement, and in this embodiment, the age difference threshold is 16.4Ma (i.e. 6.4Ma +10 Ma); the age difference between the dolomite surrounding rock and the dolomite cement filled in the pores at the earliest stage is 5.8Ma (233.8Ma-228Ma) and not more than the age difference threshold of 16.4 Ma;
in summary, the ages of the two dolomites were consistent, taking into account experimental testing errors, indicating that after the fluid replaces the original limestone to form the surrounding dolomite, there was also room for the cemented dolomite to precipitate from the fluid, thus determining the porosity in the sample as inherited.
The principle and the implementation mode of the invention are explained by applying specific embodiments in the invention, and the description of the embodiments is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A dolostone relay type bearing pore identification method comprises the following steps:
obtaining a dolomite rock sample for isotope dating; the isotope annual dolomite rock sample simultaneously has dolomite surrounding rocks and the earliest stage dolomite cement filled in pores, and the rock sample is not altered;
determining isotope year measurement by using dolomite surrounding rocks in the dolomite rock sample and the earliest stage dolomite cement filled in the pores, and obtaining the age of the dolomite surrounding rocks and the age of the earliest stage dolomite cement filled in the pores in the isotope year measurement;
if the age difference between the age of the dolomite surrounding rock and the age of the earliest stage of dolomite cement filled in the pores does not exceed the age difference threshold value, the pores of the dolomite are inherited pores;
wherein an age difference not exceeding the age difference threshold indicates formation at the same time period.
2. The identification method of claim 1, wherein the obtaining an isotopically annual dolomite rock sample comprises:
obtaining a dolomite thin slice sample which simultaneously has dolomite surrounding rocks and the earliest stage dolomite cement filled in pores;
and (3) carrying out cathode luminescence and back scattering image analysis on the dolomite thin slice sample to judge whether the sample is altered, and if the sample is not altered, using the dolomite thin slice sample as a dolomite rock sample for isotope dating.
3. The identification method as set forth in claim 2, wherein the dolomite flake sample is subjected to cathodoluminescence and backscatter image analysis, and if the dolomite surrounding rock and the earliest stage dolomite cement filled in the pores in the dolomite flake sample have uniform cathodoluminescence zone brightness and the dolomite surrounding rock and the earliest stage dolomite cement filled in the pores in the dolomite flake sample have flat backscatter images, it is judged that the sample has not been altered.
4. The identification method of claim 2, wherein said obtaining a dolomitic sheet sample having both dolomitic surrounding rock and the earliest stage of dolomite cement packed within the pore space comprises:
obtaining a sample in which the earliest stage dolomite cement is filled in the pore space and the surrounding rock is dolomite;
filling epoxy resin into the pores of the sample in which the earliest dolomite binder is filled and the surrounding rock is dolomite;
slicing the dolomite sample after being filled with the epoxy resin, wherein the slicing area covers the dolomite surrounding rock and the earliest dolomite binder filled in the pores, so that the dolomite slice sample simultaneously with the dolomite surrounding rock and the earliest dolomite binder filled in the pores is obtained.
5. The identification method of claim 4, wherein obtaining a sample having pores filled with an earliest stage dolomite cement and a surrounding rock of dolomitic rock comprises:
collecting a dolomite sample with cement on the pore wall;
analyzing the stage and type of the cementing material in the pores of the collected dolomite sample;
selecting a sample in which the earliest dolomite binder is filled in the pore space and the surrounding rock is the dolomite.
6. An identification method as claimed in claim 2, wherein the dolomitic rock sheet sample has a thickness of 80-100 microns.
7. The identification method according to claim 4, wherein the filling with the epoxy resin is performed under vacuum at 80-85 ℃.
8. The identification method of claim 4, wherein the delineation isotope is located adjacent to the pore wall during the process of delineating the dolomite surrounding rock in the dolomite rock sample and the earliest stage of the dolomite cement filled in the pore.
9. The identification method according to claim 1, wherein the performing isotope year uses a U-Pb isotope year.
10. The identification method of claim 4, wherein the age difference threshold does not exceed a sum of an error value for the age of the dolomite surrounding rock obtained by isotope dating and an error value for the age of the earliest stage of dolomite cement packed in the pores obtained by isotope dating.
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|---|---|---|---|---|
| CN114441581A (en) * | 2021-12-07 | 2022-05-06 | 青岛海洋地质研究所 | Discrimination analysis method for multi-stage cause dense dolomite |
| CN114441581B (en) * | 2021-12-07 | 2022-11-08 | 青岛海洋地质研究所 | Discrimination analysis method for multi-stage cause dense dolomite |
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