CN112284993B - Inheritance type pore recognition method in dolomite - Google Patents
Inheritance type pore recognition method in dolomite Download PDFInfo
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- CN112284993B CN112284993B CN202010974780.5A CN202010974780A CN112284993B CN 112284993 B CN112284993 B CN 112284993B CN 202010974780 A CN202010974780 A CN 202010974780A CN 112284993 B CN112284993 B CN 112284993B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- 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
- G01—MEASURING; TESTING
- 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
- G01N27/62—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
- G01N27/626—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
- 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
Abstract
The invention provides a method for identifying inherited pores in dolomite. The method comprises the following steps: acquiring a dolomite rock sample for isotope measurement; the dolomite rock sample for isotope year has dolomite surrounding rock and the earliest dolomite cement filled in the pore, and is not changed; the method comprises the steps of delineating dolomite surrounding rock in a dolomite rock sample for isotope measurement and the earliest dolomite cement filled in the pores, and obtaining the age of the dolomite surrounding rock and the age of the earliest dolomite cement filled in the pores by isotope measurement; if the age difference between the age of the dolomite surrounding rock and the age difference of the dolomite cement filled in the pores at the earliest stage is not more than the age difference threshold value, the pores of the dolomite are inherited pores. The method provides a quantification means for identifying inherited pores in dolomite by objective comparison of ages of the surrounding rock dolomite and the cementing material dolomite.
Description
Technical Field
The invention belongs to the technical field of rock analysis, and particularly relates to a method for identifying inherited pores in dolomite.
Background
The identification of dolomite pore causes has important guiding significance for oil and gas exploration. In deep underground conditions, dolomite generally has a higher porosity than limestone, making it an important hydrocarbon reservoir (Ehrenberg and Nadeau, 2005). The vast majority of dolomite in geological history is formed by the exchange of dolomite with a fluid of dolomite, a process known as dolomite action. In theory, the reservoir space (pore) of dolomite may form in multiple stages (Lucia, 2004) before the dolomite is petrochemical (i.e., the inherited pore referred to in the present invention), during the process of the dolomite or after the dolomite is petrochemical. The size and spatial distribution of reservoirs caused by the pores formed at different stages are different, and different strategies are adopted in exploration (Sun, 1992).
Although dolomite pores can form in multiple stages, recent studies have shown that even those which have undergone strong diagenetic modifications, their inherited pores are very high in the reservoir space and even predominate. Zhao Wenzhi et al (2018) comprehensively analyzed for the pore cause types of ancient dolomite reservoirs in the middle Sichuan, tarim and Erdos basins, considered that "the pores in dolomite were mainly from sedimentary primary pores of the raw rock, and partly from superficial erosion and buried erosion effects" (Zhao Wenzhi et al, dolomite cause types, identification features and reservoir space causes, oil exploration and development, 2018, volume 45, 6). They said "deposited primary pores" and "superficial erosion" are actually inherited pores to which the present invention refers. Therefore, the method for accurately identifying the inheritance type pores in the dolomite has important significance for improving the reliability of reservoir distribution prediction and reducing the oil and gas exploration risk. The only current approach to identifying inherited or even other types of pores in dolomite is to classify the pore types in dolomite based on microscopic structural features by core and flake observations, i.e. petrographic analysis, for example Zhang Xuefeng etc. (Zhang Xuefeng et al, residual structure of dolomite and pore classification problems caused thereby, deposition journal, 2011, volume 29, 3). However, petrographic analysis is inevitably affected by subjective factors such as the background of the researcher's knowledge, academic preferences, working experience, etc., which results in that the knowledge obtained by different persons often varies even for the same sample. In addition, for ancient dolomite, the pores of the dolomite are often partially or completely filled by the cement, so that the details of the dolomite cannot be observed under a microscope, and the subjective factors of researchers are added to the potential risks in practical application.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a method capable of objectively and accurately identifying inherited pores in dolomite. The method is beneficial to dolomite pore cause research, so that the reliability of a reservoir cause research result is improved, and reservoir prediction and exploration risks are reduced.
In order to achieve the above object, the present invention provides a method for identifying inherited type pores in dolomite, wherein the method comprises:
acquiring a dolomite rock sample for isotope measurement; the dolomite rock sample for isotope year measurement is provided with dolomite surrounding rock and dolomite cement filled in the pores at the earliest stage, and the rock sample is not changed;
the method comprises the steps of delineating dolomite surrounding rock in a dolomite rock sample for isotope measurement and the earliest dolomite cement filled in the pores, and obtaining the age of the dolomite surrounding rock and the age of the earliest dolomite cement filled in the pores by isotope measurement;
if the age difference between the age of the dolomite surrounding rock and the age difference of the dolomite cement filled in the pores at the earliest stage is not more than the age difference threshold value, the pores of the dolomite are inherited pores;
wherein the age difference does not exceed the age difference threshold, indicating formation during the same period.
In the above method for identifying inherited pores in dolomite, it is preferable that the acquiring the isotope year-old dolomite rock sample includes:
acquiring a dolomite sheet sample simultaneously having dolomite surrounding rock and the earliest stage of dolomite cement filled in the pores;
and performing cathodoluminescence and back scattering image analysis on the dolomite flake sample to judge whether the sample is changed, and taking the dolomite flake sample as the isotope year-measuring dolomite sample if the sample is not changed.
In the above method for identifying inherited type pores in dolomite, preferably, the sample of dolomite sheet is subjected to cathodoluminescence and back scattering image analysis, and if the cathodoluminescence girdle of the dolomite surrounding rock and the dolomite binder of the earliest stage filled in the pores in the sample of dolomite sheet is uniform in brightness, and the back scattering image of the dolomite surrounding rock and the dolomite binder of the earliest stage filled in the pores in the sample of dolomite sheet is flat, it is determined that the sample is not altered. In the process, if any one of dolomite surrounding rock in the sample and dolomite cement filled in the pores at the earliest stage is detected to be in the form of spot cathodoluminescence or bright and dark area mixing phenomenon in a back scattering image, the sample is judged to have been altered, is not representative and is discarded.
In the above-described method for identifying inherited type pores in dolomite, preferably, the acquiring the dolomite sheet sample having both the dolomite surrounding rock and the dolomite cement of the earliest stage filled in the pores includes:
obtaining a sample of dolomite cement filled in the pores at the earliest stage and surrounding rock being dolomite;
filling epoxy resin into the pores of the sample with the earliest dolomite cement and the surrounding rock being dolomite; filling epoxy resin into the pores to achieve the purpose of consolidation, thereby avoiding the problem that the cement crystals on the walls of the pores collapse during slicing, and further analysis cannot be carried out;
slicing the dolomite sample filled with the epoxy resin, wherein the slicing area covers the dolomite surrounding rock and the dolomite cement filled in the pores at the earliest stage, so that the dolomite sheet sample with the dolomite surrounding rock and the dolomite cement filled in the pores at the earliest stage is obtained.
In the above method for identifying inherited type pores in dolomite, preferably, obtaining a sample in which pores are filled with the earliest dolomite binder and surrounding rock is dolomite comprises:
collecting dolomite samples with cement on the pore walls;
performing cement quality and type analysis in pores on the collected dolomite sample;
a sample was selected in which the pores were filled with the earliest dolomite binder and the surrounding rock was dolomite.
In the above-described method for identifying inherited pores in dolomite, it is preferable that the thickness of the dolomite flake sample is 80 to 100 μm.
In the above-described method for identifying inherited type voids in dolomite, it is preferable that the epoxy resin filling is performed under vacuum at 80 to 85 ℃.
In one embodiment, void filling with epoxy is performed using a rock casting machine.
In one embodiment, small pieces of sample are isolated from the collected dolomite samples for cement stage and type analysis.
In one embodiment, sample observation is performed using a scanning electron microscope to achieve cement quality and type analysis in the pores.
In a specific embodiment, the dolomite flake sample is a polished flake.
In the above method for identifying inherited type pores in dolomite, preferably, the surrounding dolomite rock in the measured dolomite rock sample and the dolomite cement filled in the pores at the earliest stage are both close to the walls of the pores; so as to ensure that the two selected dolomite types are adjacent in space as far as possible, and facilitate the comparison of final age results.
In the above method for identifying inherited type pores in dolomite, preferably, the isotope measurement is performed by using a U-Pb isotope.
In the above method for identifying inherited type pores in dolomite, it is preferable that the isotope measurement is performed by calculating each measurement point after performing a U-Pb isotope test 207 Pb/ 206 Pb and 238 U/ 206 pb ratios and dropping these ratios to the Tera-Wasserburg graphic acquisition age.
In one embodiment, isotope testing is performed using a laser ablation inductively coupled plasma mass spectrometer (LA-ICP-MS).
In the above method for identifying inherited type pores in dolomite, preferably, the age difference threshold value does not exceed a sum of an error value of the age of the dolomite surrounding rock obtained by isotope measurement and an error value of the age of the dolomite cement of the earliest stage filled in the pores obtained by isotope measurement. The age of dolomite surrounding rock obtained by isotope dating under the condition of considering errors is overlapped with the age of dolomite cementing material filled in the pores at the earliest stage obtained by isotope dating, so that the ages of the dolomite surrounding rock and the dolomite cementing material are considered to be consistent.
In the above-mentioned method for identifying inherited type pores in dolomite, if the age difference between the dolomite surrounding rock and the first-stage dolomite binder filled in the pores does not exceed the age difference threshold, it is considered that the ages of the dolomite surrounding rock and the first-stage dolomite binder in the pores are identical, which means that the dolomite fluid has a space for mineral crystallization in the rock after the original limestone is bred to form surrounding dolomite, so that the first-stage dolomite binder is precipitated immediately. The above indicates that the pores of dolomite are present before the dolomite has been used for the petrochemical process, and are inherited pores.
According to the technical scheme provided by the invention, the petrology analysis and the isotope dating technology are fused, and the objective and accurate identification of inherited pores in dolomite is achieved through age comparison of surrounding dolomite and cement dolomite in the pores. In a word, the technical scheme provided by the invention provides a quantification means for identifying inherited pores in dolomite by objective comparison of 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 identifying dolomite pore causes by the existing microscope observation method; on the other hand, for ancient dolomite, the pore structure details cannot be obtained by the prior microscope observation because the pores of the ancient dolomite are partially or even completely filled by the cementing agent, and in this case, the technical scheme provided by the invention is particularly important for accurately judging the pore cause.
Drawings
Fig. 1 is a flow chart of an inherited pore identification method in dolomite provided in embodiment 1 of the present invention.
FIG. 2 is a graph of dolomite samples 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 map of a dolomite sheet sample in example 1 of the present invention.
FIG. 5 is a back-scattered image of a dolomite flake sample in example 1 of the present invention.
Fig. 6 is an isotope annual diagram of dolomite surrounding rock for isotope annual survey in example 1 of the present invention.
Fig. 7 is an isotope annual chart of the earliest dolomite cement filled in the pores with dolomite rock samples 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 more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. 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 present invention, the inherited pores refer to reservoir spaces (pores) formed in dolomite before the dolomite acts.
In the invention, the pore refers to the reservoir space of dolomite, which comprises holes, holes and slits.
Example 1
The embodiment provides a method for identifying inherited pores in dolomite, which is used for identifying inherited pores of a Sichuan basin binary dolomite sample; the method specifically comprises the following steps (the flow of which is shown in fig. 1):
the first step: collecting dolomite samples with cement on the pore walls;
as shown in fig. 2, the sample was visually distinguishable from dark surrounding dolomite and white crystals of cement dolomite in the holes.
And a second step of: observing the acquired dolomite sample by using a scanning electron microscope to analyze the period and type of the cementing agent in the pores; selecting a sample with the pores filled with the earliest dolomite cement at the first stage and surrounding rock being dolomite, and carrying out subsequent steps;
specifically, small samples are separated from the collected dolomite samples, the small samples are observed and photographed by a scanning electron microscope, the period and the type of the cementing agent in the pores are accurately identified, the result is shown in figure 3, the only primary cementing agent in the first period in the pores is dolomite, and the samples meet the requirements; and selecting a sample of which the pore is filled with the earliest dolomite cement and the surrounding rock is dolomite, and carrying out subsequent steps.
And a third step of: filling epoxy resin into the pores of the sample with the earliest dolomite binder and the surrounding rock being dolomite in the pores under the conditions of vacuum and 80 ℃ by using a rock casting instrument; slicing the dolomite sample filled with the epoxy resin, wherein the slicing area covers the dolomite surrounding rock and the earliest dolomite cement filled in the pores, so that the dolomite sheet sample simultaneously provided with the dolomite surrounding rock and the earliest dolomite cement filled in the pores is prepared; the dolomite flake sample was a polished flake having a thickness of 100 microns.
Fourth step: observing the dolomite flake sample by using a cathode luminescence and back scattering electron microscope, analyzing the cathode luminescence and back scattering images to judge whether the sample is changed, and taking the dolomite flake sample as the dolomite sample for isotope year measurement if the sample is not changed;
if the brightness of the cathode luminous ring belt of the dolomite surrounding rock and the dolomite binder of the earliest stage filled in the pores in the dolomite sheet sample is uniform, and the backscattering images of the dolomite surrounding rock and the dolomite binder of the earliest stage filled in the pores in the dolomite sheet sample are straight, judging that the sample is not changed;
if any one of dolomite surrounding rock and dolomite cement filled in the pores at the earliest stage in the dolomite sheet sample is in spot cathode luminescence or has bright and dark area mixing phenomenon in a back scattering image, judging that the sample is changed, is not representative, and is not needed to be discarded;
as shown in fig. 4, the cathodoluminescent annulus of the dolomite sheet sample is distinct and uniform in brightness; as shown in fig. 5, the back-scattered image of the dolomite flake sample was flat and regular, indicating that no post-alteration of the dolomite flake sample occurred and was available for subsequent steps.
Fifth step: the method comprises the steps of delineating dolomite surrounding rock in a dolomite rock sample for isotope measurement and the earliest dolomite cement filled in the pores, and carrying out U-Pb isotope measurement to obtain the age of the dolomite surrounding rock and the age of the earliest dolomite cement filled in the pores; wherein, the liquid crystal display device comprises a liquid crystal display device,
the isotope measurement year is carried out by calculating each measuring point after carrying out U-Pb isotope test 207 Pb/ 206 Pb and 238 U/ 206 pb ratios and dropping these ratios to the Tera-Wasserburg graphic acquisition age;
as shown in fig. 6 and 7, the dolomite surrounding rock has an age of 233.8±6.4Ma, and the first-stage dolomite binder filled in the pores has an age of 228±10Ma.
Sixth step: if the age difference between the age of the dolomite surrounding rock and the age difference of the dolomite cement filled in the pores at the earliest stage is not more than the age difference threshold value, the pores of the dolomite are inherited pores; wherein the age difference does not exceed an age difference threshold, indicating formation during the same period;
the ages of dolomite surrounding rock and dolomite cement filled in the pores at the earliest stage are 233.8+/-6.4 Ma and 228+/-10 Ma respectively;
the age difference threshold is the sum of the error value of the age of the dolomite surrounding rock obtained by isotope measurement and the error value of the age of the earliest dolomite binder filled in the pore obtained by isotope measurement, and in this embodiment, the age difference threshold is 16.4Ma (i.e., 6.4ma+10ma); the age difference between the age of the dolomite surrounding rock and the earliest dolomite cement filled in the pores is 5.8Ma (233.8 Ma-228 Ma) which does not exceed the age difference threshold value of 16.4Ma;
in summary, the ages of the two dolomites were consistent taking experimental test errors into account, indicating that after fluid interchange of the original limestone to form the surrounding dolomite, there was room in the rock for the cement dolomite to precipitate from the fluid, and thus the voids in the sample could be determined to be inherited voids.
The principles and embodiments of the present invention have been described in detail with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.
Claims (4)
1. An inherited pore identification method in dolomite, which is characterized by comprising the following steps:
acquiring a dolomite rock sample for isotope measurement; the dolomite rock sample for isotope year measurement is provided with dolomite surrounding rock and dolomite cement filled in pores at the earliest stage, and the dolomite rock sample is not changed;
the method comprises the steps of delineating dolomite surrounding rock in a dolomite rock sample for isotope measurement and the earliest dolomite cement filled in the pores, and obtaining the age of the dolomite surrounding rock and the age of the earliest dolomite cement filled in the pores by isotope measurement;
if the age difference between the age of the dolomite surrounding rock and the age difference of the dolomite cement filled in the pores at the earliest stage is not more than the age difference threshold value, the pores of the dolomite are inherited pores;
wherein the age difference does not exceed an age difference threshold, indicating formation during the same period;
wherein, the acquiring the dolomite rock sample for isotope year measurement comprises:
acquiring a dolomite sheet sample simultaneously having dolomite surrounding rock and the earliest stage of dolomite cement filled in the pores;
performing cathodoluminescence and back scattering image analysis on the dolomite flake sample to judge whether the sample is changed, and taking the dolomite flake sample as a dolomite sample for isotope year measurement if the sample is not changed; performing cathodoluminescence and back scattering image analysis on the dolomite sheet sample, and judging that the sample is not altered if the brightness of a cathodoluminescence girdle of the dolomite surrounding rock and the dolomite cement filled in the pores at the earliest stage in the dolomite sheet sample is uniform and the back scattering images of the dolomite surrounding rock and the dolomite cement filled in the pores at the earliest stage in the dolomite sheet sample are straight;
wherein the acquiring of the dolomite sheet sample having both the dolomite surrounding rock and the earliest stage of dolomite cement filled in the pores comprises:
obtaining a sample of dolomite cement filled in the pores at the earliest stage and surrounding rock being dolomite;
filling epoxy resin into the pores of the sample with the earliest dolomite cement and the surrounding rock being dolomite;
slicing the dolomite sample filled with the epoxy resin, wherein the slicing area covers the dolomite surrounding rock and the dolomite cement filled in the pores at the earliest stage, so that the dolomite sheet sample with the dolomite surrounding rock and the dolomite cement filled in the pores at the earliest stage is obtained;
wherein, the sample that fills the earliest first-stage dolomite cement in the pore and the surrounding rock is dolomite is obtained comprises:
collecting dolomite samples with cement on the pore walls;
performing cement quality and type analysis in pores on the collected dolomite sample;
selecting a sample with the pores filled with the earliest dolomite cement at the first stage and the surrounding rock being dolomite;
wherein, the dolomite surrounding rock in the dolomite rock sample for the delineating isotope year and the dolomite cement filled in the aperture in the earliest stage are both close to the aperture wall;
wherein, the isotope year measurement is carried out by selecting U-Pb isotope year measurement.
2. The method of claim 1, wherein the dolomite flake sample has a thickness of 80-100 microns.
3. The method of claim 1, wherein the epoxy resin filling is performed under vacuum at 80-85 ℃.
4. The method of claim 1, wherein the age difference threshold does not exceed a sum of an error value of an age of the dolomite surrounding rock obtained by isotope dating and an error value of an age of the dolomite binder of an earliest stage filled in the aperture obtained by isotope dating.
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| CN102071929A (en) * | 2010-12-09 | 2011-05-25 | 中国石油天然气股份有限公司 | Method for generating dolomite reservoir geochemical plate |
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| CN111060673A (en) * | 2019-12-31 | 2020-04-24 | 核工业北京地质研究院 | Method for calculating uranium mineralization age of sandstone-type uranium deposit |
| CN111257188A (en) * | 2018-11-30 | 2020-06-09 | 中国石油天然气股份有限公司 | Multi-scale characterization method and device for carbonate rock pore system |
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| CN102071929A (en) * | 2010-12-09 | 2011-05-25 | 中国石油天然气股份有限公司 | Method for generating dolomite reservoir geochemical plate |
| WO2016161914A1 (en) * | 2015-04-07 | 2016-10-13 | 四川行之智汇知识产权运营有限公司 | Method for predicting reservoir lithogenous phase using geology and logging information |
| CN111257188A (en) * | 2018-11-30 | 2020-06-09 | 中国石油天然气股份有限公司 | Multi-scale characterization method and device for carbonate rock pore system |
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