CN115236766B - Ancient temperature scale construction and heat history recovery method based on autogenous microcrystalline quartz QCI - Google Patents
Ancient temperature scale construction and heat history recovery method based on autogenous microcrystalline quartz QCI Download PDFInfo
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 205
- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000011084 recovery Methods 0.000 title claims abstract description 16
- 238000010276 construction Methods 0.000 title claims abstract description 15
- 239000010453 quartz Substances 0.000 claims abstract description 122
- 238000002310 reflectometry Methods 0.000 claims abstract description 67
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims abstract description 14
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 11
- 239000011707 mineral Substances 0.000 claims abstract description 11
- 239000004079 vitrinite Substances 0.000 claims description 40
- 239000011435 rock Substances 0.000 claims description 26
- 238000012360 testing method Methods 0.000 claims description 16
- 238000004364 calculation method Methods 0.000 claims description 11
- 235000010755 mineral Nutrition 0.000 claims description 10
- 238000002441 X-ray diffraction Methods 0.000 claims description 9
- 238000004458 analytical method Methods 0.000 claims description 9
- 239000010426 asphalt Substances 0.000 claims description 9
- 238000004445 quantitative analysis Methods 0.000 claims description 7
- 239000010433 feldspar Substances 0.000 claims description 6
- 238000009529 body temperature measurement Methods 0.000 claims description 4
- 239000004925 Acrylic resin Substances 0.000 claims description 3
- 229920000178 Acrylic resin Polymers 0.000 claims description 3
- 229910021532 Calcite Inorganic materials 0.000 claims description 3
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 3
- 229910001748 carbonate mineral Inorganic materials 0.000 claims description 3
- 238000005136 cathodoluminescence Methods 0.000 claims description 3
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- 229940072033 potash Drugs 0.000 claims description 3
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 3
- 235000015320 potassium carbonate Nutrition 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
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- 229910052586 apatite Inorganic materials 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 7
- 238000005755 formation reaction Methods 0.000 description 7
- VSIIXMUUUJUKCM-UHFFFAOYSA-D pentacalcium;fluoride;triphosphate Chemical compound [F-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O VSIIXMUUUJUKCM-UHFFFAOYSA-D 0.000 description 7
- 229910052845 zircon Inorganic materials 0.000 description 7
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 7
- 230000004992 fission Effects 0.000 description 6
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- LRCFXGAMWKDGLA-UHFFFAOYSA-N dioxosilane;hydrate Chemical compound O.O=[Si]=O LRCFXGAMWKDGLA-UHFFFAOYSA-N 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 210000000003 hoof Anatomy 0.000 description 2
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
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- 235000014676 Phragmites communis Nutrition 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- -1 aluminum-iron-manganese Chemical compound 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 230000000035 biogenic effect Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V11/00—Prospecting or detecting by methods combining techniques covered by two or more of main groups G01V1/00 - G01V9/00
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- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- Analysing Materials By The Use Of Radiation (AREA)
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Abstract
The invention relates to a method for constructing an ancient temperature scale and recovering heat history based on self-generated microcrystalline quartz QCI, which utilizes crystal growth of siliceous minerals, and further determines the correlation between the quartz crystallinity index and the mirror body reflectivity or equivalent mirror body reflectivity by measuring the quartz crystallinity index and the mirror body reflectivity or equivalent mirror body reflectivity of a sample, and finally takes the quartz crystallinity index QCI of the self-generated microcrystalline quartz as a novel ancient temperature scale. The shale heat history recovery method adopts the ancient temperature scale constructed by the ancient temperature scale construction method to measure the ancient temperature. The ancient temperature mark constructed by the invention can disregard the repeated diagenetic effect, gets rid of the superposition interference of temperature information, overcomes various defects existing in the past ancient temperature mark, and provides a new solution for the thermal history study of the next ancient world and the stratum below and the ancient carbonate stratum.
Description
Technical Field
The invention belongs to the technical field of oil and gas exploration, relates to shale oil and gas exploration technology, and in particular relates to an ancient temperature scale construction method based on autogenous microcrystalline quartz QCI and a shale heat history recovery method.
Background
Whether sea shale gas reservoirs such as Sichuan basin cow hoof pond group, wufeng-Longmaxi group shale or lake shale oil reservoirs such as Songliao basin Qingshou group shale, erdos basin extension group shale, bohai Bay basin hole store group and Guangdong basin reed rhizome ditch group shale layers all have multi-type and multi-style siliceous-organic matter symbiotic phenomena, so cooperative evolution of siliceous and organic matters is also necessarily present, and certain correlation exists between characterization parameters of the two.
The geothermal history of sedimentary basins is the necessary content for basin dynamics and oil and gas exploration research, and the recovery method has two main types: ancient temperature scale and earth dynamics. Common ancient temperature marks include organic ancient temperature marks and mineral ancient temperature marks. The organic matter ancient temperature scale comprises a vitrinite reflectance and an equivalent vitrinite reflectance, namely, conversion relation is established between other organic matter components (a vitrinite, asphalt and graptolite) and the vitrinite reflectance. However, the conversion relationships proposed by different students differ greatly, resulting in a large difference in thermal history results. The mineral ancient temperature scale mainly comprises two types of apatite and zircon fission tracks, and apatite and zircon (U-Th)/He.
At present, the reflectivity of the vitrinite is taken as an ancient temperature scale, and the vitrinite is widely accepted by the industry because of the irreversibility and the temperature sensitivity of the vitrinite and the complete establishment of a dynamic model of the vitrinite. Other paleo-temperature markers are also typically correlated to the specular reflectance and then used to determine paleo-temperature using a temperature kinetic model. However, the ancient carbonate strata lack not only the vitrinite, but also the apatite and zircon, which results in the heat history study of the ancient carbonate strata which always lacks the effective ancient temperature scale.
Previous studies have found autogenous microcrystalline quartz that develops multiple cause types, polycrystalline morphology and distribution characteristics in the next ancient kingdom and below and in ancient carbonate formations. There is currently little research exploring the paleo-ground temperature from the perspective of silica. If the change rule of the authigenic microcrystalline quartz evolving along with the organic matters can be thoroughly clarified, not only can the research of the interaction mechanism of the siliceous-organic matters co-evolution of the shale be promoted, but also the ancient temperature information contained in the authigenic microcrystalline quartz can be explored, the existing ancient temperature standard parameter system is supplemented, the heat history of the basin in the period of the ancient period of the hypo-the duly of the joss can be further disclosed in an auxiliary manner, basic theoretical support is provided for the exploration of natural gas reservoirs of the old sea stratum, and important scientific and practical significance is achieved.
The existing ancient temperature standard and temperature measurement method for the next ancient kingdom and the stratum below and the ancient carbonate stratum comprises the following steps:
(1) An organic matter ancient temperature marking method. While the specular reflectivity is used in formations above the next ancient world and the specular is lacking in formations below the next ancient world, it is generally scaled using bitumen reflectivity and graptolite reflectivity, referred to as "equivalent specular reflectivity". However, the greatest problem with this approach is: ① Bitumen and graptolite are not necessarily present in the formation; ② The scaling relationships proposed by different scholars vary widely, leading to a wide variety of thermal history results.
(2) Low temperature chronology parameter method. The method mainly comprises (U-Th)/He and fission tracks (apatite, zircon and sphene). The sealing temperatures of different minerals in the method are greatly different, and the ancient temperature of the stratum can be well measured only by comprehensive application. In general, the measurement is relatively accurate in the temperature range of 40 to 250 ℃. However, only apatite fission track anneals currently have mature kinetic models, and the fission track annealing kinetic models of zircon and sphene are not completely established.
(3) Carbonate cluster isotope method. The method has the advantage of being free from the influence of the fluid environment of mineral growth by measuring the degree of deviation of 13C-18 O abundance from random distribution (T Δ47) and then by means of an empirical formula of the method and temperature. But this method is susceptible to diagenetic effects such as: the recrystallization results in a reset of T Δ47, which no longer reflects the original temperature information.
(4) Other methods. Other ancient temperature standard methods also include: organic matter infrared spectrum, organic matter solid state nuclear magnetic resonance spore powder color, tooth shape stone color change index, rock thermal acoustic emission method, etc. These methods are mostly correlated with the specular reflectance and then subjected to thermal history reconstruction.
From the above, as the oil and gas exploration goes deep, there is no effective and widely applicable ancient temperature scale to determine the temperature experienced by the ancient stratum, and a specific method needs to be established to determine the temperature experienced by the next ancient kingdom and the stratum below and the ancient carbonate stratum, so that the geothermal history study of the oil and gas-containing basin is assisted.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides the archaeological temperature mark construction method based on the autogenous microcrystalline quartz QCI and the shale heat history recovery method, wherein the archaeological temperature mark constructed by the archaeological temperature mark construction method is not limited by the content of original substances, has wide applicability, can eliminate the interference of temperature information superposition caused by repeated lifting-burying of a stratum regardless of the repeated layer rock effect, and overcomes various defects existing in the prior archaeological temperature mark by accurately measuring the archaeological temperature of the archaeological temperature mark.
In order to achieve the above purpose, the invention provides a method for constructing an ancient temperature scale based on self-generated microcrystalline quartz QCI, which comprises the following specific steps:
S1, selecting a shale sample, and performing 60-70 degrees/2 theta total rock X-ray diffraction analysis, asphalt reflectivity analysis and vitrinite reflectivity analysis on the shale sample to obtain a quartz crystallinity index QCI, vitrinite reflectivity and equivalent vitrinite reflectivity of the total rock sample;
S2, dividing ranges according to the test data of the reflectivity of the vitrinite or the equivalent vitrinite, selecting two samples with the highest and lowest quartz crystallinity indexes QCI of the all-rock sample in each range, mixing the two samples in different proportions, carrying out 60-70 DEG/2 theta all-rock X-ray diffraction analysis on the mixed samples, determining the quartz crystallinity index QCI value of the mixed samples, and establishing a correlation plate and a calculation model of the minimum sample percentage content of the quartz crystallinity indexes QCI of the all-rock sample and the quartz crystallinity indexes QCI of the mixed samples;
S3, taking the content of quartz and other minerals of an actual shale reservoir sample as a reference, knowing the percentage content of each component, adopting artificial low-temperature quartz to simulate autogenous microcrystalline quartz, adopting igneous rock high-purity quartz ore samples to simulate clastic quartz, adopting potash feldspar ore samples to simulate feldspar, adopting high-purity calcite ore samples to simulate carbonate minerals, and bonding each component by using acrylic resin to prepare an artificial sample;
S4, performing high-resolution energy spectrum scanning imaging quantitative analysis on the artificial sample under a scanning electron microscope to determine the quartz content; performing cathodoluminescence analysis on the same visual field to determine the content of the clastic quartz and further determine the content of the authigenic microcrystalline quartz;
s5, performing 0-45 degrees/2 theta all-rock X-ray diffraction analysis on the artificial sample to determine the quartz content; manufacturing a cathode luminescent sheet, performing cathode luminescent observation, and determining the content of the clastic quartz by adopting image processing software so as to determine the content of the authigenic microcrystalline quartz;
s6, comparing the content of the authigenic microcrystalline quartz obtained in the steps S4 and S5 with the proportion of the artificial low-temperature quartz used in the preparation of the artificial sample, and determining which quantitative method has higher accuracy in calculating the content of the authigenic microcrystalline quartz;
S7, establishing a correlation plate and a calculation model between the quartz crystallinity index QCI value and the autogenous microcrystalline quartz content of the mixed sample on the premise of determining the quartz and the autogenous quartz content of two actual sample fragments with the highest quartz crystallinity index QCI and the lowest quartz crystallinity index QCI of the total rock sample in the range of the reflectivity of each vitrinite or the reflectivity of the equivalent vitrinite by using the quantitative method with high accuracy determined in the S6;
And S8, according to the correlation plate and the calculation model established in the step S7, the quartz crystallinity index QCI value of the authigenic microcrystalline quartz with the quartz content of 100 percent is the quartz crystallinity index QCI value of the authigenic microcrystalline quartz under the corresponding mirror body reflectivity or equivalent mirror body reflectivity, and finally, the correlation between the quartz crystallinity index QCI value of the authigenic microcrystalline quartz and the mirror body reflectivity or equivalent mirror body reflectivity is obtained, and the quartz crystallinity index QCI value of the authigenic microcrystalline quartz is used as an archaic temperature scale and is used for archaic temperature measurement of the next-archaic world and the lower stratum and the archaic carbonate stratum.
Further, the method also comprises the following steps: and (3) establishing the correlation between the quartz crystallinity index QCI value of the authigenic microcrystalline quartz of the overpressure sample and the mirror body reflectivity or equivalent mirror body reflectivity, comparing different points of the correlation between the quartz crystallinity index QCI value of the authigenic microcrystalline quartz of the overpressure sample and the mirror body reflectivity or equivalent mirror body reflectivity, and then correcting the overpressure influence of the quartz crystallinity index QCI value of the authigenic microcrystalline quartz by combining with the stratum pressure coefficient.
The invention also provides a shale heat history recovery method, which adopts the ancient temperature scale constructed by the ancient temperature scale construction method based on the quartz crystallinity index, namely the quartz crystallinity index QCI of the authigenic microcrystalline quartz, and carries out heat history recovery by measuring the quartz crystallinity index QCI value of the authigenic microcrystalline quartz.
Compared with the prior art, the invention has the advantages and positive effects that:
(1) The invention constructs a novel ancient temperature scale based on QCI, namely quartz crystallinity index QCI of the authigenic microcrystalline quartz, the crystallization growth of the authigenic microcrystalline quartz is usually irreversible, the highest temperature is recorded, the repeated diagenetic effect can be disregarded, the superposition interference of temperature information is avoided, meanwhile, the stratum in each period contains siliceous substances, the self-generating microcrystalline quartz is also necessarily contained, the ancient temperature scale constructed by the method of the invention is used for carrying out shale heat history recovery, the limitation of the content of original substances can be completely avoided, various defects existing in the ancient temperature scale in the past are overcome, and a new solution is provided for the heat history research of the stratum and the ancient carbonate stratum in the ancient world and below.
(2) The ancient temperature scale constructed by the ancient temperature scale construction method, namely the quartz crystallinity index QCI of the authigenic microcrystalline quartz, is far lower than the (U-Th)/He and fission tracks (apatite, zircon and sphene) tests due to the fact that the quartz crystallinity index test cost (including price and test period) is very low, and is lower than the specular body, graptolite and asphalt reflectivity tests. In addition, the existing carbonate cluster isotope method is mostly sent to foreign laboratory tests, and compared with the method, the shale heat history recovery method provided by the invention has the advantages that the quartz crystallinity index QCI of the authigenic microcrystalline quartz is used as an ancient temperature scale for testing, and the cost is lower and lower.
(3) At about 33 ℃, opal-A starts to convert to Opal-CT, in the early diagenetic stage B, opal-CT can crystallize to form authigenic microcrystalline quartz-namely alpha-quartz, and at one atmosphere pressure, the alpha-quartz crystal cannot enter an asymmetric structure state until being converted into beta-quartz at 573.0 ℃, the temperature span range is very large, and the ancient temperature can be avoided by adopting the ancient temperature scale constructed by the invention, namely the quartz crystallinity index QCI of authigenic microcrystalline quartz to measure the ancient temperature, namely the ancient temperature can be measured by comprehensively utilizing other various minerals.
Drawings
FIG. 1 is a flow chart of a method for constructing an ancient temperature scale based on self-generated microcrystalline quartz QCI according to an embodiment of the invention;
FIG. 2 is a graph showing the correlation between the percentage of the lowest QCI sample and the QCI of the quartz crystallinity index of the mixed sample in the same scope of the reflectivity of the lens body and a calculation model in accordance with the embodiment of the present invention;
FIG. 3 is a graph showing the correlation between the quartz content of the authigenic microcrystals and the quartz crystallinity index QCI of the mixed sample in the same scope of the reflectivity of the lens body and a calculation model in accordance with the embodiment of the invention;
Fig. 4 is a diagram showing the correlation between the quartz crystallinity index QCI of the sea shale and the reflectivity of the equivalent vitrinite according to an embodiment of the invention.
Detailed Description
The invention will now be described in more detail by way of exemplary embodiments with reference to the accompanying drawings. It is to be understood that elements, structures, and features of one embodiment may be beneficially incorporated in other embodiments without further recitation.
The emittance of the vitrinite is an effective archaeological scale, but no vitrinite is found in the ancient kingdom and below and in the ancient carbonate formations. In addition, bitumen and graptolite are also unusual in formations. However, each stage of the formation contains siliceous materials, and has a high content, and necessarily contains autogenous quartz. The invention provides a QCI-based ancient temperature scale construction method, which utilizes crystal growth of siliceous minerals, and determines the correlation between a quartz crystallinity index and a specular reflection index or an equivalent specular reflection index of a sample by measuring the quartz crystallinity index and the specular reflection index or the equivalent specular reflection index of the sample, so as to finally take the quartz crystallinity index QCI of authigenic microcrystalline quartz as a novel ancient temperature scale. The ancient temperature mark constructed by the method is quartz crystallinity index QCI of authigenic microcrystalline quartz, and is not limited by the content of original substances. The ancient temperature scale constructed by the method is based on the crystal growth of siliceous minerals, has irreversibility, records the highest temperature, can disregard the diagenetic effect of repeatability, and gets rid of the interference of temperature information superposition caused by stratum repeated lifting-burying. The above-described method of the present invention will be described in detail with reference to the accompanying drawings.
Example 1: referring to fig. 1, the invention provides a QCI-based ancient temperature scale construction method, which comprises the following specific steps:
S1, selecting a shale sample, and performing 60-70 degrees/2 theta total rock X-ray diffraction analysis, asphalt reflectivity analysis and vitrinite reflectivity analysis on the shale sample to obtain a quartz crystallinity index QCI, vitrinite reflectivity and equivalent vitrinite reflectivity of the total rock sample.
S2, dividing the range according to the test data of the vitrinite reflectivity or the equivalent vitrinite reflectivity, selecting two samples with the highest and lowest quartz crystallinity indexes QCI of the all-rock sample in each range, mixing the two samples in different proportions, carrying out 60-70 DEG/2 theta all-rock X-ray diffraction analysis on the mixed samples, determining the quartz crystallinity index QCI value of the mixed samples, and establishing a correlation plate and a calculation model (see figure 2) of the percentage content of the sample with the lowest value of the quartz crystallinity index QCI of the all-rock sample and the quartz crystallinity index QCI of the mixed samples.
It should be noted that, there are 16 samples in the dividing range, and the number of samples can be selected according to the actual requirement, and is not limited to 16 samples.
S3, taking the content of quartz and other minerals of an actual shale reservoir sample as a reference, knowing the percentage content of each component, adopting artificial low-temperature quartz (namely alpha-quartz) to simulate autogenous microcrystalline quartz, a igneous rock high-purity quartz ore sample to simulate clastic quartz, a potash feldspar ore sample to simulate feldspar, a high-purity calcite ore sample to simulate carbonate minerals, and bonding each component by using acrylic resin to prepare an artificial sample.
S4, carrying out high-resolution (2 mu m multiplied by 2 mu m) energy spectrum scanning imaging quantitative analysis on the artificial sample under a scanning electron microscope, and determining the quartz content; and performing cathodoluminescence analysis on the same visual field of the artificial sample to determine the content of the clastic quartz and further determine the content of the authigenic microcrystalline quartz.
S5, performing 0-45 degrees/2 theta all-rock X-ray diffraction analysis on the artificial sample to determine the quartz content; and manufacturing a cathodoluminescent sheet, performing cathodoluminescent observation, and determining the content of the detritus quartz by adopting image processing software so as to determine the content of the authigenic microcrystalline quartz. Specifically, the Image processing software employs Image Pro Plus Image processing software.
S6, comparing the content of the authigenic microcrystalline quartz obtained in the steps S4 and S5 with the proportion of the artificial low-temperature quartz (namely alpha-quartz) used in the preparation of the artificial sample, and determining which quantitative method has higher accuracy in calculating the content of the authigenic microcrystalline quartz.
And S7, establishing a correlation plate and a calculation model between the quartz crystallinity index QCI value and the autogenous microcrystalline quartz content of the mixed sample on the premise of determining the highest and lowest quartz and autogenous quartz content of two actual sample fragments of the quartz crystallinity index QCI of the whole rock sample in the range of the reflectivity of each vitrinite or the equivalent vitrinite by using the high-accuracy quantification method determined in the step S6 (see figure 3).
And S8, according to the correlation plate and the calculation model established in the step S7, the quartz crystallinity index QCI value of the authigenic microcrystalline quartz with the quartz content of 100 percent is the quartz crystallinity index QCI value of the authigenic microcrystalline quartz under the corresponding mirror body reflectivity or equivalent mirror body reflectivity, and finally, the correlation between the quartz crystallinity index QCI value of the authigenic microcrystalline quartz and the mirror body reflectivity or equivalent mirror body reflectivity is obtained, and the quartz crystallinity index QCI value of the authigenic microcrystalline quartz is used as an archaic temperature scale and is used for archaic temperature measurement of the next-archaic world and the lower stratum and the archaic carbonate stratum.
Since the quartz crystallinity index QCI is affected by the overpressure, in order to eliminate the influence of the overpressure on the quartz crystallinity index QCI, the above-mentioned ancient temperature scale construction method further comprises the following steps: and (3) establishing the correlation between the quartz crystallinity index QCI value of the authigenic microcrystalline quartz of the overpressure sample and the mirror body reflectivity or equivalent mirror body reflectivity, comparing different points of the correlation between the quartz crystallinity index QCI value of the authigenic microcrystalline quartz of the overpressure sample and the mirror body reflectivity or equivalent mirror body reflectivity, and then correcting the overpressure influence of the quartz crystallinity index QCI value of the authigenic microcrystalline quartz by combining with the stratum pressure coefficient.
The correlation of the quartz crystallinity index QCI of the authigenic microcrystalline quartz with the specular reflectance and the equivalent specular reflectance is verified by specific experiments below.
During the experiment, samples of the Sichuan basin Pentafeng-Longmaxi group and Sichuan basin niu-hoof pond group were used. Wherein the high-quality shale section of the five-peak-Loma stream group corresponds to the band of five-peak group 2-3 (WF 2-3) and Loma stream group 1-4 (LM 1-4) graptolite, and the siliceous matter is mainly biogenic autogenous quartz; whereas the siliceous silica of the Loma group 5-9 (LM 5-9) graptolite is mostly clastic quartz. The cow hoof pond group siliceous characteristic shows different causes in different areas. Therefore, to investigate the relationship between the crystallinity index of the authigenic microcrystalline quartz and the reflectivity of the vitrinite in the shale reservoir, the siliceous cause in the sample is classified by the correlation of siliceous element, zirconium element, biological barium, aluminum-iron-manganese triangle plate, and silicon-aluminum element plate, and then the test finds: the QCI of the sea shale in the Sichuan basin and the reflectivity of the equivalent vitrinite (hereinafter referred to as ER o) are in positive correlation (see figure 4), and whether the quartz is mainly made of chips or biological cause quartz or mixed cause quartz is mainly made, the QCI of the sample is in good positive correlation with ER o, and the gradient is not very different.
To illustrate the advantages of the above method of the present invention, by contrast, the correlation between the quartz crystallinity index QCI of the authigenic microcrystalline quartz and the specular reflectivity or equivalent specular reflectivity is obtained by screening, which comprises the following steps: selecting a shale sample with the same vitrinite reflectivity or equivalent vitrinite reflectivity value or reflectivity range as that used for the mixed sample in the step S2, treating the shale sample to be completely loosened, drying, and removing the clastic quartz particles by using a 2500-mesh sieve; and (3) carrying out quartz crystallinity index QCI measurement on the shale sample from which the chip quartz particles are removed to obtain a quartz crystallinity index QCI value of the authigenic microcrystalline quartz, thereby obtaining the correlation between the quartz crystallinity index QCI of the authigenic microcrystalline quartz and the reflectivity of the vitrinite or the equivalent vitrinite. In the process of measuring the quartz crystallinity index QCI, other substances need to be dissolved out by strong acid, otherwise, the quartz crystallinity index QCI of the authigenic microcrystalline quartz may not be measured. Therefore, the quartz crystallinity index QCI measured by adopting the screening method has high risk on one hand, and other extra equipment is needed for auxiliary test on the other hand, so that the test cost is high. The method does not need to use strong acid for corrosion, is safe and convenient, does not need other extra equipment for assistance, and has low test cost.
Example 2: the embodiment provides a shale heat history recovery method, which adopts the ancient temperature scale constructed by the ancient temperature scale construction method based on quartz crystallinity index described in the embodiment 1, namely quartz crystallinity index QCI of authigenic microcrystalline quartz, and carries out heat history recovery by measuring the quartz crystallinity index QCI value of authigenic microcrystalline quartz.
The shale heat history recovery method of the embodiment takes quartz crystallinity index QCI of authigenic microcrystalline quartz as an ancient temperature scale, the cost for testing the ancient temperature scale is very low, which is lower than that of a vitrinite, graptolite and asphalt reflectivity test and far lower than that of a (U-Th)/He and fission tracks (apatite, zircon and sphene) test. In addition, the existing carbonate cluster isotope method is mostly sent to foreign laboratory tests, and compared with the method, the shale heat history recovery method provided by the invention has the advantages that the quartz crystallinity index QCI of the authigenic microcrystalline quartz is used as an ancient temperature scale for testing, and the cost is lower and lower.
The above-described embodiments are intended to illustrate the present invention, not to limit it, and any modifications and variations made thereto are within the spirit of the invention and the scope of the appended claims.
Claims (3)
1. The ancient temperature scale construction method based on the autogenous microcrystalline quartz QCI is characterized by comprising the following specific steps of:
S1, selecting a shale sample, and performing 60-70 degrees/2 theta total rock X-ray diffraction analysis, asphalt reflectivity analysis and vitrinite reflectivity analysis on the shale sample to obtain a quartz crystallinity index QCI, vitrinite reflectivity and equivalent vitrinite reflectivity of the total rock sample;
S2, dividing ranges according to the test data of the reflectivity of the vitrinite or the equivalent vitrinite, selecting two samples with the highest and lowest quartz crystallinity indexes QCI of the all-rock sample in each range, mixing the two samples in different proportions, carrying out 60-70 DEG/2 theta all-rock X-ray diffraction analysis on the mixed samples, determining the quartz crystallinity index QCI value of the mixed samples, and establishing a correlation plate and a calculation model of the minimum sample percentage content of the quartz crystallinity indexes QCI of the all-rock sample and the quartz crystallinity indexes QCI of the mixed samples;
S3, taking the content of quartz and other minerals of an actual shale reservoir sample as a reference, knowing the percentage content of each component, adopting artificial low-temperature quartz to simulate autogenous microcrystalline quartz, adopting igneous rock high-purity quartz ore samples to simulate clastic quartz, adopting potash feldspar ore samples to simulate feldspar, adopting high-purity calcite ore samples to simulate carbonate minerals, and bonding each component by using acrylic resin to prepare an artificial sample;
S4, performing high-resolution energy spectrum scanning imaging quantitative analysis on the artificial sample under a scanning electron microscope to determine the quartz content; performing cathodoluminescence analysis on the same visual field to determine the content of the clastic quartz and further determine the content of the authigenic microcrystalline quartz;
s5, performing 0-45 degrees/2 theta all-rock X-ray diffraction analysis on the artificial sample to determine the quartz content; manufacturing a cathode luminescent sheet, performing cathode luminescent observation, and determining the content of the clastic quartz by adopting image processing software so as to determine the content of the authigenic microcrystalline quartz;
s6, comparing the content of the authigenic microcrystalline quartz obtained in the steps S4 and S5 with the proportion of the artificial low-temperature quartz used in the preparation of the artificial sample, and determining which quantitative method has higher accuracy in calculating the content of the authigenic microcrystalline quartz;
S7, establishing a correlation plate and a calculation model between the quartz crystallinity index QCI value and the autogenous microcrystalline quartz content of the mixed sample on the premise of determining the highest and lowest quartz and autogenous quartz content of two actual sample fragments of the quartz crystallinity index QCI of the total rock sample in the range of the reflectivity of each vitrinite or the reflectivity of the equivalent vitrinite by using the high-accuracy quantification method determined in the step S6;
And S8, according to the correlation plate and the calculation model established in the step S7, the quartz crystallinity index QCI value of the authigenic microcrystalline quartz with the quartz content of 100 percent is the quartz crystallinity index QCI value of the authigenic microcrystalline quartz under the corresponding mirror body reflectivity or equivalent mirror body reflectivity, and finally, the correlation between the quartz crystallinity index QCI value of the authigenic microcrystalline quartz and the mirror body reflectivity or equivalent mirror body reflectivity is obtained, and the quartz crystallinity index QCI value of the authigenic microcrystalline quartz is used as an archaic temperature scale and is used for archaic temperature measurement of the next-archaic world and the lower stratum and the archaic carbonate stratum.
2. The archaic temperature scale construction method based on the authigenic microcrystalline quartz QCI according to claim 1, further comprising the steps of: and (3) establishing the correlation between the quartz crystallinity index QCI value of the authigenic microcrystalline quartz of the overpressure sample and the mirror body reflectivity or equivalent mirror body reflectivity, comparing different points of the correlation between the quartz crystallinity index QCI value of the authigenic microcrystalline quartz of the overpressure sample and the mirror body reflectivity or equivalent mirror body reflectivity, and then correcting the overpressure influence of the quartz crystallinity index QCI value of the authigenic microcrystalline quartz by combining with the stratum pressure coefficient.
3. A shale heat history recovery method, which is characterized in that the heat history recovery is carried out by measuring the quartz crystallinity index QCI value of the authigenic microcrystalline quartz by adopting the archaic temperature scale constructed by the archaic temperature scale construction method based on the authigenic microcrystalline quartz QCI according to any one of claims 1 or 2.
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