73 results about "Oxygen" patented technology

The invention discloses a method for evaluating the mineralization potential of porphyry copper-(gold-molybdenum) ore. The evaluation method comprises the following steps: determining candidate rock masses with relatively high mineralization potential according to an oxygen fugacity value of magma zircon and / or a magma water content value of hornblende in a rock sample in an evaluation area; the aluminum saturation index ASI of the candidate rock mass is measured and calculated, the distribution coefficient and the distribution coefficient ratio of Cu, Au and Mo between fluid and melt are determined according to the ASI, simulation calculation is conducted through a Rayleigh fractionation model according to the distribution coefficient and / or the distribution coefficient ratio, and the content ratio of Au to Cu to Mo to Cu of the candidate ore body is obtained. According to the method, the mineralization potential of the porphyry copper ore and the enrichment degree and grade of Cu, Au and Mo of potential ore bodies can be rapidly and accurately evaluated.

The present plated member includes, on an outer surface, a plated film mainly composed of chromium deposited from a trivalent chromium bath containing at least chromium, carbon, and oxygen, in which the plated film contains 60 to 80 at % of chromium and 16.5 to 30 at % of carbon and has an indentation hardness of 7 GPa or more on the outer surface, and a degree of crystallinity calculated from a peak integrated intensity ratio of a measured value of X-ray diffraction measurement and the following expression (1) is 4% or less.

The present invention discloses a quantitative calculation method for the hydrogen and oxygen isotopes in surface water during the evaporation fractionation process in the field of isotope tracing technology, aiming to solve the problems of low calculation accuracy and large uncertainty in the existing calculation methods. It includes: analyzing the kinetic effect of the evaporation fractionation process; constructing the probability mass function of the isotope body and decomposing the ratio of the heavy / light isotope body; quantitatively describing the dissipation rate of the heavy / light isotope body in the evaporation fractionation; combining the water evaporation rate to obtain the change efficiency of the heavy / light isotope body during the evaporation fractionation process; and calculating the isotope body content in the remaining surface water. The present invention enhances the application adaptability of the calculation method to various conventional and extreme situations, reveals the isotope fractionation change law in surface water during the evaporation process, and improves the reliability of the results.

In the magnetoresistance effect element according to one aspect, the metal oxide constituting the metal oxide layer has the ratio of oxygen higher than the total ratio of metal when the composition is expressed in the stoichiometric composition; and the resistivity of the metal oxide layer is higher than that of the tunnel barrier layer.

A process for producing technetium-99m from a molybdenum-100 metal powder, comprising the steps of:(i) irradiating in a substantially oxygen-free environment, a hardened sintered target plate coated with a Mo-100 metal, with protons produced by a cyclotron;(ii) dissolving molybdenum ions and technetium ions from the irradiated target plate with an H2O2 solution to form an oxide solution;(iv) raising the pH of the oxide solution to about 14;(v) flowing the pH-adjusted oxide solution through a resin column to immobilize K[TcO4] ions thereon and to elute K2[MoO4] ions therefrom;(vi) eluting the bound K[TcO4] ions from the resin column;(vii) flowing the eluted K[TcO4] ions through an alumina column to immobilize K[TcO4] ions thereon;(viii) washing the immobilized K[TcO4] ions with water;(ix) eluting the immobilized K[TcO4] ions with a saline solution; and(x) recovering the eluted Na[TcO4] ions.

A method for activating an exposed layer of a structure including a provision of a structure including an exposed layer, a deposition of a layer based on a material of formula SiaYbXc, with X chosen from among fluorine F and chlorine Cl, and Y chosen from among oxygen O and nitrogen N, a, b and c being non-zero positive integers, a treatment of the layer SiaYbXc by an activation plasma based on at least one from among oxygen and nitrogen, the parameters of the deposition of the layer SiaYbXc being chosen so as to obtain a sufficiently low material density such that the layer SiaYbXc is at least partially consumed by the activation plasma.

The invention discloses a continuous flow method carbonate carbon and oxygen isotope determination method based on nitrogen instead of helium. The method comprises the following steps: carrying out nitrogen purging on a headspace bottle filled with a sample by using high-purity nitrogen carrier gas; the headspace bottle added with phosphoric acid for reaction is put into an automatic sample injector, and CO2-containing mixed gas to be detected is carried by high-purity helium carrier gas to be transferred in an analysis gas path; in the transferring process, target gas CO2 in the CO2-containing mixed gas to be detected is purified, and N2O generated in the ion source and N2 transmitted into the ion source by the helium carrier gas are diluted; the helium carrier gas carrying the target gas CO2 and the diluted N2O and N2 sequentially enters a gas isotope mass spectrometer for determination after passing through a continuous flow shunting interface, and a carbon and oxygen isotope test result of the target gas CO2 is obtained. According to the invention, the technical prejudice that only helium flow can be adopted for purging the headspace bottle in the prior art is overcome, the high-precision test result of the carbonic acid rock carbon and oxygen isotope can be obtained, and the test cost is reduced.

The present invention belongs to the field of uranium geological exploration, and specifically discloses a method for evaluating the flow capacity of oxygen-containing uranium-containing water in sandstone-type uranium deposits, comprising: step S101, based on the analysis of structural deformation characteristics, the structural evolution of the structural layer where the uranium reservoir is located is restored; step S102, based on the plane structural map corresponding to each structural deformation period, the ancient burial depth, ancient inclination and ancient migration distance parameters of oxygen-containing uranium-containing water in the uranium reservoir in each geological historical period are obtained; step S103, based on the particle size analysis of the uranium reservoir, the Trask sorting coefficient is obtained; step S104, the flow capacity coefficient of oxygen-containing uranium-containing water in the uranium reservoir is calculated, and the flow capacity of oxygen-containing uranium-containing water in each geological historical period is determined. The present invention can quantitatively evaluate the flow capacity of oxygen-containing uranium-containing water in the uranium mineralization historical period, so as to provide important parameters for evaluating the uranium mineralization potential and favorable area prediction of sandstone-type uranium deposits.

The invention discloses a grid side wall imaging method. The method comprises the steps that a semiconductor structure which has a grid and a first side wall which covers the side wall of the grid is provided; a polycrystalline carbon layer is prepared to cover the surface of the semiconductor structure; the polycrystalline carbon layer is partially removed, so that a second side wall of the grid is formed on the surface of the first side wall; after a source drain implantation process is carried out on the semiconductor structure, the second side wall is removed; and a source drain annealing technology is continued. According to the grid side wall imaging method provided by the invention, through oxygenated plasma treatment, a polycrystalline carbon side wall which is used as a main side wall can be neatly removed; without using an SPT process which needs to be carried out in a specific etching cavity, the problem of void in a high stress through hole etching stop layer process can be solved; a process flow is simplified; and the production cost is reduced.

The invention belongs to the technical field of alloys, and particularly relates to a rare earth-doped copper-gallium temperature correction alloy and a preparation method and application thereof.The rare earth-doped copper-gallium temperature correction alloy comprises, by mass, 0-23 wt% of Ga, 0.005-1.5 wt% of RE and the balance Cu and inevitable impurity elements, and the melting point range of the rare earth-doped copper-gallium temperature correction alloy is 915-1084.6 DEG C. A plurality of copper-gallium temperature correction alloys are placed in a container to form the alloy temperature correction device. The alloy temperature correction device is placed at the position where temperature correction and temperature measurement are needed, the state of the temperature correction alloy is checked afterwards, and the real temperature of the position where the alloy temperature correction device is located is judged according to whether the shape of the temperature correction alloy changes or not. The method has the advantages of being rapid in detection, convenient and flexible to operate, in situ and free of wire connection, the melting point of the temperature calibration alloy is not easily influenced by a small amount of oxygen in the atmosphere, is not subjected to radiation and electromagnetic interference of various particles and is not influenced by pressure changes, and the method is suitable for temperature calibration and measurement of industrial furnaces under the pressure of various atmospheres and has wide application prospects. And the accuracy of temperature measurement in scientific research and production processes is ensured.

The invention discloses an optical temperature measurement luminescent material, the chemical composition general formula of the luminescent material is Sc2-x-yMo3O12: xSm < 3 + >, yEu < 3 + >, x is more than or equal to 0.01 and less than or equal to 0.05, and y is more than or equal to 0.01 and less than or equal to 0.05. A preparation method of an optical temperature measurement luminescent material comprises the following steps: (1) taking an oxygen-containing compound containing elements of Sc, Sm, Mo and Eu as a raw material, weighing corresponding raw materials according to a molar ratio of each element in a chemical composition general formula Sc2-x-yMo3O12: xSm < 3 + > and yEu < 3 + >, x and y being doped molar fractions of Sm < 3 + > and Eu < 3 + >, 0.01 < = x < = 0.05, and 0.01 < = y < = 0.05; (2) fully grinding the weighed raw materials in a mortar, and uniformly mixing to obtain a solid mixture; (3) sintering the solid mixture in an air atmosphere; and (4) cooling the sintered product to room temperature along with the furnace, and grinding with a mortar to obtain Sm < 3 + > and Eu < 3 + > doped Sc2Mo3O12 powder.

The present invention provides a composite particle that can achieve both high silicon utilization and oxidation inhibition during water dispersion. The composite particle of the present invention is a composite particle having a particle containing carbon material and silicon, and a coating layer containing carbon and oxygen on the surface of the particle, and has a true density of 1.80 to 1.99 g / cm 3 In the Raman spectrum, a peak exists at 450 to 495 cm ‑1 If the intensity of the peak is I Si , and the intensity of the G band is I G , then I Si / I G is 1.3 or less, and in X-ray photoelectron spectroscopy, if the atomic ratios of Si, O, and C are A Si , A O , and A C , and the ratios of SiO2 and SiO are B SiO2 , B SiO , then A Si is 0.05 or more, and I Si / I G and A C / (A C +A Si ×(B SiO2 +B SiO )) have a prescribed relationship.

The invention discloses a method for identifying the producing area of saffron crocus by extracting saffron crocus aldehyde and measuring the stable isotope ratio of the saffron crocus aldehyde. The invention discloses a method for extracting crocetin from saffron crocus and measuring the stable isotope ratio of carbon to hydrogen to oxygen. The method comprises the following steps: S1, determining the stable isotope ratio of carbon to hydrogen to oxygen of a crocetin standard substance by using an elemental analysis-stable isotope mass spectrometer; s2, extracting crocus sativus aldehyde from the crocus sativus sample to obtain a crocus sativus aldehyde extracting solution; s3, determining the carbon, hydrogen and oxygen stable isotope ratio of crocetin in the crocetin extracting solution by using a gas chromatography-stable isotope mass spectrometer; and S4, calibrating the carbon, hydrogen and oxygen stable isotope ratio of crocetin in the crocetin extracting solution by adopting the carbon, hydrogen and oxygen stable isotope ratio of the crocetin standard substance. The standard substance is used for calibrating the stable isotope ratio of carbon, hydrogen and oxygen of the single compound crocetin, and the method can be used for identifying the producing area of crocetin.

The application discloses a kind of based on regularized non-negative least square method's production method carbon-oxygen ratio calculation method.There is following step: S1, obtains stratum common element and carbon-oxygen ratio logging instrument's inelastic gamma standard spectrum;S2, by carbon-oxygen ratio logging instrument to the stratum of place is measured, and the inelastic gamma mixed energy spectrum obtained by measurement is analyzed;S3, establish by each standard energy interval's inelastic gamma standard spectrum and inelastic gamma mixed spectrum count constitutes the contradictory linear equation group;S4, obtains the production of stratum carbon, oxygen element;S5, using the production of stratum carbon, oxygen element obtained in step S4 does ratio, obtains the production method carbon-oxygen ratio not by energy spectrum count statistics influence.The beneficial effect of the application is: improve the accuracy of production method carbon-oxygen ratio and the sensitivity of carbon-oxygen ratio to oil layer identification.

A method for processing an object for lithography comprising: Providing a first gas comprising first molecules; Providing a particle beam on a working area of the object for removing a first material (A) in the working area based at least in part on the first gas; wherein the first material comprises chromium and nitrogen, and wherein the first material comprises at least 1 atomic percent nitrogen, preferably at least 5 atomic percent nitrogen, more preferably at least 10 atomic percent nitrogen, most preferably at least 20 atomic percent nitrogen; wherein the first molecules comprise a halogen compound; wherein the halogen compound comprises a noble gas halide; Providing a second gas comprising second molecules, wherein the removal of the first material is further based at least in part on the second gas; wherein the second molecules comprise an oxygen-containing component; wherein the first material comprises chromium nitride.

The invention provides an experimental method for determining stable carbon and oxygen isotopes by a two-way sampling method, and relates to the technical field of stable isotope analysis. The experimental method comprises the following steps: selecting carbon dioxide gas with the purity of more than 99.999% as carbon dioxide reference gas, and selecting a calcium carbonate carbon and oxygen isotope standard substance and a target sample to be measured; and then the stable carbon and oxygen isotopes are determined through a two-way sample introduction method, standard gas does not need to be purchased, the isotope ratio of a sample relative to a standard substance is obtained through conversion application of a formula, finally, the isotope ratio is successfully calibrated to the value of international standard PDB, and the experiment cost is saved. The method can be widely applied to other stable isotope two-way sample introduction methods, principle communication is achieved, and determination can be conducted through the experimental method under the condition that no standard gas exists.

The application discloses a heating path determination method for gas removal of an ultrahigh-temperature inert gas circulation system, and steps are as follows: establishing dynamic state variables of impurity gas in the system, system pumping capacity parameters and safety constraint conditions of refractory alloy during the gas removal process; establishing a coupling relationship between the impurity gas release rate and the system pumping capacity, and determining a main release temperature interval of the impurity gas; analyzing oxidation or oxygen permeation behaviors of the refractory alloy, determining a high-temperature sensitive temperature interval of the refractory alloy, and clarifying dynamic constraint conditions for entering the interval; and combining the main release temperature interval and the high-temperature sensitive temperature interval to determine an allowed trajectory of the system temperature changing with time during the gas removal process. The application combines the state of the impurity gas in the system and the oxidation or oxygen embrittlement risk of the refractory alloy under high-temperature conditions, realizes sufficient removal of the impurity gas in the system, avoids the impurity from entering the high-temperature interval in the high release stage, and thus reduces the risk of significant oxidation or oxygen embrittlement damage of the refractory alloy.

A method of preparing remediated MoO3 from naturally-occurring molybdenum, or molybdenum that is enriched in one, the other or both of Mo-98 and Mo-100 isotopes from a particulate rhenium-containing MoO3 matrix that contains one, the other or both of those isotopes is disclosed as is the product remediated MoO3 that contains less than about 1000 ppt rhenium. In accordance with the invention, particulate rhenium-containing MoO3 matrix is heated in the presence of an oxygen-containing gaseous stream to a temperature of greater than about 300° C. and less than about 800° C. The temperature and oxidative sparging are maintained for a time sufficient to assure that rhenium has been oxidized to rhenium(VII), diffuses to form the dimer (Re2O7), and is then vaporizingly removed as Re2O7, while retaining the remediated MoO3.

An object of the present invention is to provide an oxygen absorbing and releasing material and a manufacturing method thereof which improve oxygen absorbing and releasing capacity at low temperatures and ensure heat resistance. The oxygen absorbing and releasing material of the present invention contains ceria-zirconia-based composite oxide containing ceria (CeO2) and zirconia (ZrO2), the ceria-zirconia-based composite oxide containing praseodymium (Pr) or neodymium (Nd) as an additive element, at least a part of the ceria-zirconia-based composite oxide having at least one ordered phase of a kappa phase and a pyrochlore phase, 40% to 100% of primary particles having a particle diameter of 0.4 μm to 1.5 μm existing on a basis of the number of particles, an X-ray diffraction pattern being obtained by X-ray diffraction using CuKα after heating at a temperature condition of 1100°C for 5 hours in the atmosphere, an I(14 / 29) value calculated from the X-ray diffraction pattern being 0.015 or more, and an I(28 / 29) value being 0.08 or less.

This invention discloses a method and system for determining the explosion risk of transformer oil under the influence of an electric arc in an oxygen-deficient environment. The method includes: collecting free mixed gas generated in the oxygen-deficient space inside a transformer or oil-filled equipment under the influence of an electric arc or thermal fault; directly determining the composition and volume fraction of each component of the mixed gas using a Fourier transform infrared spectroscopy analyzer, wherein the components include at least methane, ethane, ethylene, and acetylene; calculating the lower and upper explosive limits of the mixed gas using the Richardley formula based on the volume fraction of each component; calculating the characteristic gas ratios C2H2 / C2H4 and C2H4 / C2H6, and determining the fault type according to a preset judgment logic based on the changing trend of the acetylene volume fraction; and comprehensively assessing the explosion risk level of the equipment by combining the explosion limits and the fault type. This invention replaces traditional chromatography with infrared spectroscopy analysis, eliminating the need for degassing and providing faster detection speed; it corrects the fault judgment logic using experimental data, compensating for the shortcomings of traditional guidelines under specific operating conditions; and it introduces explosion limit calculation to directly quantify the ease with which the gas can be ignited, providing more intuitive data support for explosion-proof safety.

Crystalline material containing oxygen, aluminum and phosphorus, exhibiting the powder X-ray diffraction peaks shown in the table below. 2 θ (°) d (nm) Relative intensity 8,65±0,2 1,022 1-15 9,99±0,2 0,885 1-15 14,17±0,2 0,625 100 16,52±0,2 0,537 5-80 17,37±0,2 0,511 1-15 21,81±0,2 0,407 10-80 22,44±0,2 0,396 2-15 24,66±0,2 0,361 15-70 26,11±0,2 0,341 10-80 28,56±0,2 0,313 5-40 29,80±0,2 0,300 3-30 33,17±0,3 0,270 1-20 34,93±0,3 0,257 1-15 36,21±0,3 0,248 2-15 39,02±0,3 0,231 1-10 43,44±0,3 0,208 1-10

A rare earth aluminate phosphor includes: a first element M1 including at least one selected from the group consisting of yttrium (Y), lanthanum (La), lutetium (Lu), gadolinium (Gd), and terbium (Tb); cerium (Ce); aluminum (Al); oxygen atoms (O) and optionally a second element M2 including at least one selected from the group consisting of gallium (Ga) and scandium (Sc). The rare earth aluminate phosphor has a composition in which when a number of moles of oxygen atoms is 12, a total number of moles of the first element M1 and cerium is 2.9 or more and 3.1 or less, and a total number of moles of aluminum and the second element M2 is 4.5 or more and 5.5 or less, and has a reflection spectrum in which a ratio of reflectance at a wavelength of 280 nm to reflectance at a wavelength of 380 nm is 0.33 or more and 0.76 or less.

A highly efficient method for removing oxygen, sulfur, and selenium from tellurium for purification includes the following steps: charging; controlling the reducing atmosphere; volatilization; distillation; and ingot casting. This method can directly obtain 4N tellurium product through a single vacuum distillation. The product has low levels of single-point-digestible impurities such as selenium, sulfur, and oxygen, providing high-quality raw materials with low levels of oxygen-containing impurities for subsequent preparation of 5N and higher purity tellurium. By controlling the vacuum degree and H2 content during the vacuum distillation process, this method efficiently removes impurities such as selenium, sulfur, and oxygen while improving tellurium recovery.

A process (200) for the determination of 2-phase and 3-phase saturations using oxygen count rates obtained using a downhole tool (102). A 2-phase saturation measurement of gas and wet (oil-water) separation may be determined (210) using short space (SS) and long space (LS) oxygen count ratio and porosity. A 2-phase saturation measurement of oil and water-gas separation may be determined (214) using a normalized short space (SS) or long space (LS) oxygen count rate, and a short space (SS) and long space (LS) oxygen count ratio. The 2-phase saturation determinations may be combined to determine (216) a 3-phase determination.

The invention relates to a method for determining the concentration of an oxidizable gas component in an oxygen-containing gas mixture using a measuring device (50). The measuring device (50) comprises a sensor (60) which has a region that can be exposed to the gas mixture. The method involves the gas mixture flowing through a fluid path, such that initial time intervals, in which the gas mixture interacts with the oxidation catalyst before reaching the sensor (60), alternate with subsequent time intervals in which it does not. A differential signal is generated to determine the concentration of the oxidizable gas component.

The present invention provides a method for compressing a water-containing, oxygen-containing stream originating from an electrolytic cell, the method comprising at least the steps of: (a) providing a water-containing, oxygen-containing stream (10); (b) mixing the water-containing, oxygen-containing stream (10) provided in step (a) as a suction fluid in an ejector (2) with a water-containing stream (20) as a driving fluid, thereby obtaining a mixed stream; (c) flashing the mixed stream through the ejector (2), thereby obtaining a two-phase fluid (30) discharged from the ejector (2); (d) separating the two-phase fluid (30) discharged from the ejector (2) into an oxygen-containing gas stream (40) and a liquid stream (50); and (e) compressing the liquid stream (40) obtained in step (d). (f) using the pressurized liquid stream obtained in step (e) as the driving fluid (20) of step (b); (g) dehydrogenating the oxygen-containing gas stream (40) obtained in step (d), thereby obtaining a dehydrogenated oxygen-containing stream (70); (h) dehydrating the dehydrogenated oxygen-containing stream (70) obtained in step (g), thereby obtaining a dehydrated dehydrogenated oxygen-containing stream; (i) compressing the dehydrated dehydrogenated oxygen-containing stream (80) obtained in step (h), thereby obtaining a compressed oxygen-containing stream (90); and (j) using the compressed oxygen-containing stream (90) obtained in step (i), in particular in a gasifier (9).

The invention relates to the technical field of functional materials, in particular to a hafnium oxide-doped single-phase multiferroic material and a preparation method thereof. The chemical expression of the single-phase multiferroic material is Hf1-xNbxO2 or Hf1-yTayO2, x is more than 0 and less than or equal to 0.5, and y is more than or equal to 0.25 and less than or equal to 0.5. According to the hafnium oxide-doped single-phase multiferroic material, Ta or Nb-doped hafnium oxide is used, the condition of ferromagnetic property is met by utilizing additional d orbital electrons provided by introduced transition metal Ta or Nb, meanwhile, introduced impurities do not change non-centrosymmetric arrangement of oxygen atoms, the ferroelectric property of hafnium oxide is reserved, and the ferroelectric property of the hafnium oxide is improved. Therefore, the hafnium oxide-doped single-phase multiferroic material is realized, and relatively strong magnetoelectric coupling is realized.

An object of the present invention is to provide an oxygen isotope concentration method and an oxygen isotope concentration apparatus that can safely and stably supply ozone without increasing the size of the device. The present invention provides an oxygen concentration method including: a photoreaction step of irradiating a first mixed fluid (F 1) in which oxygen and a diluent substance (DS) are mixed with a laser, selectively decomposing ozone containing an oxygen isotope, and generating oxygen containing an oxygen isotope, and obtaining a second mixed fluid (F2) in which the oxygen, the ozone, and the diluent substance (DS) are mixed; a liquid storage section introduction step of introducing the second mixed fluid (F2) into a liquid storage section (10) and liquefying it; and a separation step of introducing the second mixed fluid (F2) with hydraulic head obtained by liquefying the second mixed fluid (F2) and storing it in the liquid storage section (10), into a separation column (21), distilling the second mixed fluid (F2) which has liquefied, and separating into a third mixed fluid (F3) in which ozone and the diluent substance (DS) are mixed, and product oxygen (PO) in which oxygen isotope heavy components are concentrated; wherein the liquid storage section (10) can store the liquefied second mixed fluid (F2) without being affected by heat input.

An method (100–600) for producing hydrogen is proposed, comprising providing a first gas (1) containing hydrogen, oxygen and water, said providing the first gas (1) comprising an electrolytic conversion of water; providing a second gas (5) containing hydrogen, oxygen and water, said providing the second gas (5) comprising a condensative removal of water from the first gas (1) or a part thereof; and providing a third gas (10) containing hydrogen, said providing the third gas (10) comprising an adsorptive removal of water and a catalytic removal of oxygen from the second gas (5) or a part thereof using a adsorptive and catalytic treatment arrangement (110) comprising treatment vessels (A, B), wherein each of the treatment vessels (A, B) comprises, in a first direction from a first opening to a second opening, a first adsorption layer (211), a catalytic layer (212) and a second adsorption layer (213), wherein each of the treatment vessels (A, B) is alternatingly operated in a treatment mode and a regeneration mode, wherein, in the treatment mode, the second gas (5) or a part thereof is passed in the first direction through the treatment vessels (A, B), wherein, in the treatment mode, the first adsorption layer (211) and the second adsorption layer (213) are used for said adsorptive removal of water and the catalytic layer (212) is used for said catalytic removal of oxygen, wherein, in the regeneration mode, the treatment vessels (A, B) are heated using a heating gas (5a, 10a) which is formed from a part of the second gas (5) or the third gas (10), is heated, and is passed through the treatment vessels (A, B). A corresponding apparatus is also provided.

The invention provides a method for judging the source, formation time and cause of dolomite fluid, which comprises the following steps: determining age data of a dolomite sample, and judging the formation time of dolomite; respectively carrying out carbon and oxygen isotope determination and rare earth element determination on the dolomite sample, comparing the determination result with seawater data in the same period to obtain an analysis result, and judging the source of the diagenesis fluid by combining the analysis result of the carbon and oxygen isotope and the analysis result of the rare earth element; and determining the dolomite formation cause by combining the dolomite formation time and the diagenetic fluid source result. According to the judgment method provided by the invention, the dolomite cause can be quickly judged, the process is simplified, few testing means are used, time, manpower and material resources are greatly saved, and the problems of conclusion contradiction and uncertainty caused by adopting multiple judgment standards at the same time in the prior art are solved.