CN115081358A - Method for determining migration power and migration time of sandstone uranium ore exudation fluid - Google Patents

Method for determining migration power and migration time of sandstone uranium ore exudation fluid Download PDF

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CN115081358A
CN115081358A CN202210869111.0A CN202210869111A CN115081358A CN 115081358 A CN115081358 A CN 115081358A CN 202210869111 A CN202210869111 A CN 202210869111A CN 115081358 A CN115081358 A CN 115081358A
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李子颖
刘持恒
刘武生
李西得
邱林飞
蔡煜琦
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Beijing Research Institute of Uranium Geology
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Abstract

The application relates to a method for analyzing geologic bodies by means of physical and chemical properties of the geologic bodies, in particular to a method for determining migration power and migration time of sandstone uranium ore exudation fluid, which comprises the following steps: collecting an ore sample in a sandstone uranium deposit; determining a fluid temperature of a fluid exuding in a fluid inclusion of the ore sample; determining a structural evolution process of the region where the sandstone uranium deposit is located; determining the migration power and the migration time of the exuded fluid, wherein if the temperature of the fluid is determined to be less than a first preset value, the migration power of the exuded fluid is determined to be extrusion stress driving, and the migration time of the exuded fluid is determined to be the time of the structure lifting in the structure evolution process; and if the fluid temperature is determined to be greater than the second preset value, determining that the migration power of the exuded fluid is driven by thermal buoyancy, and determining the migration time of the exuded fluid as the time of the occurrence of a structural thermal event in the structural evolution process.

Description

Method for determining migration power and migration time of sandstone uranium ore exudation fluid
Technical Field
The application relates to a method for analyzing geologic bodies by means of the physical and chemical properties of the geologic bodies, in particular to a method for determining migration power and migration time of sandstone uranium ore exudation fluid.
Background
In the mineralization theory of exudative sandstone uranium ores, exudative reductive exudation fluid built from deep uranium-rich moves to the oxidizing sand above, and uranium mineralization is formed due to changes in physicochemical conditions. The upward migration of the exudative fluid occurs under a specific earth dynamic background, and the migration time of the exudative fluid to an mineralization part is the key moment of the exudative mineralization, so that a method capable of accurately and effectively determining the migration power and the migration time of the exudative fluid is needed so as to grasp the mineralization time and the dynamic background of the exudative sandstone uranium ore and guide the subsequent exploration work.
Disclosure of Invention
In view of the above, the present application has been developed to provide a method of determining migration kinetics and migration time of a sandstone uranium ore exudation fluid that overcomes, or at least partially addresses, the above-identified problems.
There is provided according to an embodiment of the application a method of determining migration kinetics and migration time of a sandstone uranium ore exudation fluid, including: collecting an ore sample in a sandstone uranium deposit; determining a fluid temperature of a leaching fluid in a fluid inclusion of the ore sample; determining a structural evolution process of the region where the sandstone uranium deposit is located; determining the migration power and the migration time of the exuded fluid, wherein if the temperature of the fluid is determined to be less than a first preset value, the migration power of the exuded fluid is determined to be extrusion stress driving, and the migration time of the exuded fluid is determined to be the time of the structure lifting in the structure evolution process; and if the fluid temperature is determined to be greater than the second preset value, determining that the migration power of the seepage fluid is driven by thermal buoyancy, and determining the migration time of the seepage fluid as the time of the occurrence of the structural thermal event in the structural evolution process.
According to the method for determining the migration power and the migration time of the seepage fluid of the sandstone uranium ore, the migration power and the migration time of the seepage fluid can be effectively and accurately identified, so that the mineralization time and the dynamic background of the seepage type sandstone uranium ore can be conveniently mastered, and the subsequent investigation work can be guided.
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Fig. 1 is a flow chart of a method of determining migration kinetics and migration time of a sandstone uranium ore exudation fluid according to an embodiment of the present application;
FIG. 2 is a schematic representation of exuded fluid driven by compressive stress for migration;
FIG. 3 is a schematic illustration of a process of exudate fluid development and migration according to an embodiment of the present application;
fig. 4 is a schematic diagram of an ore-forming process model according to an embodiment of the application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clear, the technical solutions of the present application will be described below in detail and completely with reference to the accompanying drawings of the embodiments of the present application. It should be apparent that the described embodiment is one embodiment of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the application without any inventive step, are within the scope of protection of the application.
It is to be noted that, unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which this application belongs. If the description "first", "second", etc. is referred to throughout, the description of "first", "second", etc. is used only for distinguishing similar objects, and is not to be construed as indicating or implying a relative importance, order or number of technical features indicated, it being understood that the data described in "first", "second", etc. may be interchanged where appropriate. If "and/or" is presented throughout, it is meant to include three juxtapositions, exemplified by "A and/or B" and including either solution A, or solution B, or both solutions A and B.
Embodiments according to the application provide a method of determining migration kinetics and migration time of a sandstone uranium ore exudation fluid, and with reference to fig. 1, include:
step S102: an ore sample in a sandstone uranium deposit is collected.
Step S104: a fluid temperature of a fluid exuding in a fluid inclusion of the ore sample is determined.
Step S106: and determining the structural evolution process of the region where the sandstone uranium deposit is located.
Step S108: the migration kinetics and migration time of the exuded fluid were determined. If it is determined in step S104 that the fluid temperature is less than the first preset value, in step S108, it may be determined that the migration power of the exuded fluid is compressive stress driving, and it may be determined that the migration time of the exuded fluid is the time during which the structure is lifted during the structure evolution process determined in step S106; if it is determined in step S104 that the fluid temperature is greater than the second preset value, then in step S108 it may be determined that the migration momentum of the effusion fluid is thermally buoyant driven, and it may be determined that the migration time of the effusion fluid is the time during which a formation thermal event occurs during the formation evolution determined in step S106.
In step S102, an ore sample in a sandstone uranium deposit is collected, and it should be noted that the sandstone uranium deposit herein refers to a sandstone uranium deposit formed by the action of a bleeding fluid, and a person skilled in the art may first determine whether the sandstone uranium deposit is formed by the action of the bleeding fluid, and then determine whether the ore sample needs to be collected to determine the migration power and migration time of the bleeding fluid.
In some embodiments, collecting the ore sample in the sandstone uranium deposit in step S102 may specifically include: determining a uranium deposit of the exudation type sandstone uranium ore; an ore sample is collected in an industrial mineralization hole of a uranium deposit.
Determining whether a sandstone uranium deposit is formed by the action of the exudation fluid may be accomplished by one skilled in the art by means of relevant techniques in the art, and may be determined, by way of example, by means of specific developmental sites, morphological characteristics, etc. of sandstone uranium deposits.
Typical exudative sandstone uranium deposits develop in the oxidative color construction of sedimentary basins (also known in the art as red mottle construction) and generally take the form of slabs, lenses, floats, and the like. Whether the uranium deposit is an exudation type sandstone uranium deposit or not can be determined by means of uranium mineralization characteristics, organic matter types, symbiotic mineral characteristics, element contents and the like in the uranium deposit, for example, in a typical exudation type sandstone uranium deposit, organic matters such as hydrocarbons, asphaltum, and rotten mud type kerogen with high maturity are generally developed, the uranium deposit type is generally uranite, asphaltum uranium deposit and the like, and is generally associated with minerals such as pyrite, chalcopyrite, galena, and sphalerite, and the content of the uranium element is obviously and positively correlated with a sulfur element, organic carbon and the like. Other suitable methods may be used by those skilled in the art to determine whether a sandstone uranium deposit is an exudative sandstone uranium deposit, and will not be described in detail herein.
After the uranium deposit of the exudative sandstone uranium ore is determined, an ore sample can be collected in an industrial mineralization hole of the uranium deposit. In some embodiments, since the ore sample is collected for the purpose of thermometry of the exuded fluids in the fluid inclusions of the ore sample, one skilled in the art can collect the ore sample based on the formation distribution of the region of the sandstone uranium deposit, preferably where the exuded fluids are relatively rich, in order to improve the efficiency of subsequent thermometry.
In some embodiments, in the process of collecting an ore sample, a uranium ore with a relatively high collection grade can be selected as the ore sample, and the high grade means that the enrichment degree of uranium in the uranium ore is high, that is, the uranium ore is transformed by a large amount of effusion fluid, and may be transformed by multiple stages of effusion fluid, so that fluid inclusions of the effusion fluid are more easily found in the uranium ore, and temperature measurement is performed on the fluid inclusions in the uranium ore, so that the migration power and the migration time of the effusion fluid in each stage can be more comprehensively determined, and omission is avoided.
In step S104, the temperature of the exuding fluid in the fluid inclusion in the ore sample is determined. Diagenetic mineralizing fluids, including the exudation fluids mentioned above, will be partially encapsulated in mineral lattice defects or pockets during mineral crystal growth to form fluid inclusions and remain as such.
The ore sample can be ground into a fluid inclusion sheet to observe and measure the temperature of the fluid inclusion therein, and the grinding method of the fluid inclusion sheet can refer to the related art and is not described herein again.
The temperature of the exuded fluid can be obtained by measuring the temperature of the fluid inclusion, the temperature of the fluid inclusion can be measured by adopting a method which is universal in the field, the uniform temperature of the fluid inclusion is mainly measured by adopting a uniform method, the temperature can be measured by adopting the main principle that the phase state of substances in the fluid inclusion changes along with the change of the temperature, when the temperature is raised to a certain temperature, a plurality of phase states in the fluid inclusion are converted into one phase, namely, the uniformity of the phase is achieved, and the temperature at the moment is the uniform temperature.
It should be noted that in the collected ore sample, besides the fluid inclusion wrapped with the exudation fluid, other types of fluid inclusions may exist, and the selection is performed before the temperature measurement, and those skilled in the art can identify the fluid inclusion wrapped with the exudation fluid based on the form of the fluid inclusion, etc., or can perform a composition analysis on the fluid inclusion to determine whether it is wrapped with the exudation fluid.
In some embodiments, the fluid inclusion can be observed under a fluorescence microscope, and the temperature measurement can be performed by selecting the fluid inclusion emitting blue fluorescence, wherein the blue fluorescence indicates the existence of hydrocarbon substances, which are characteristic components of the exuded fluid.
In step S106, it is necessary to determine the structure evolution process in the region where the sandstone uranium deposit is located, specifically, the structure evolution process may be determined based on geological data in the region, for example, the structure distribution in the region, such as a typical fracture structure, a wrinkle structure, and the like, may be identified based on the geological data, and then, the typical structure formation years may be measured by a low-temperature thermal chronology method, which is a series of year measurement methods commonly used in the art, and a person skilled in the art may select an appropriate low-temperature thermal chronology thermometry method according to actual situations to clarify the time and duration of the structure lifting event in the region. Meanwhile, the time of the formation thermal event in the area can be cleared up by collecting related geological data.
The present application proposes that if the fluid temperature determined in step S104 is less than the first preset value, i.e. the fluid temperature is relatively low, it means that the temperature at which the effusion fluid migrates is relatively low, so that the migration dynamics of the effusion fluid can be determined as stress driving in the context of extrusion dynamics, and the migration time of the effusion fluid can be further determined as the time at which the build-up occurs during the evolution of the build.
A schematic diagram of exudation fluid migration under the driving of compressive stress is shown in fig. 2, the source of compressive stress is formation lifting, during which the two side ridges 21 press against the middle depressed area (in the direction shown by the two side arrows), so that exudation fluid 23 developing in the reductive deposition formation 22 in the depressed area seeps out and migrates upward under the compressive stress (in the direction shown by the middle arrows).
The present application further proposes that if the fluid temperature determined in step S104 is greater than the second preset value, that is, the fluid temperature is relatively high, it means that the exuded fluid is disturbed by a heat source during migration, the disturbance of the heat source will cause a decrease in density of the fluid, and the fluid moves upward under the action of buoyancy, that is, the migration power is driven by thermal buoyancy, and the occurrence of the heat source corresponds to the time of occurrence of the formation thermal event, so that the migration time can be determined as the time of occurrence of the formation thermal event during the formation evolution process.
In some embodiments, the first preset value and the second preset value may be determined by a person skilled in the art according to the temperature of a common low-temperature mineralizing fluid and the temperature range of a medium-high temperature mineralizing fluid, or may also be determined according to the sedimentary burial temperature in the region of the sandstone uranium ore body. In some embodiments, the first preset value and the second preset value may be the same, and in some other embodiments, the first preset value and the second preset value may also be different, and it should be noted that the second preset value is at least not smaller than the first preset value.
It is understood that the formation of sandstone uranium deposits is a lengthy process, and the exuded fluids may migrate multiple times during the mineralization and the migration power may not be the same for each time, so that, in some cases, the temperature of the fluids in some fluid inclusions may be less than a first preset value and the temperature of the fluids in some fluid inclusions may be greater than a second preset value in step S104, and then, the migration time and migration power of the exuded fluids may be determined multiple times in step S108, and the migration time and migration power of each migration may be determined separately.
In some embodiments, to ensure as complete an analysis of migration time and migration kinetics of the exuded fluids as possible, multiple ore samples may be collected at different locations in step S102, and/or multiple fluid inclusions may be selected for thermometry in step S104.
According to the method for determining the migration power and the migration time of the seepage fluid of the sandstone uranium ore, the migration power and the migration time of the seepage fluid can be effectively and accurately identified, so that the mineralization time and the dynamic background of the seepage mineralization sandstone uranium ore can be conveniently mastered, and the subsequent investigation work can be guided.
In some embodiments, determining the tectonic evolution of the region of the sandstone uranium deposit may specifically include: and determining the time of the formation lifting in the area where the sandstone uranium deposit is located by means of a low-temperature thermal chronology method.
Common low-temperature thermal chronology methods include a fission track method, (U-Th)/He method and the like, by which the deposition state, the denudation state and the like of the structure in the region in different ages can be determined, and can be compared with the time of occurrence of regional extrusion events for analysis, so as to determine the time of occurrence of the structure lifting in the region. One skilled in the art can select a suitable low temperature thermal chronology method to determine the time of the build-up according to practical situations, and the method is not limited to this.
In some embodiments, determining the tectonic evolution of the region of the sandstone uranium deposit may include: determining the time of occurrence of a constructive thermal event in the region of the sandstone uranium deposit based on the time of the magma invasion in the region of the sandstone uranium deposit and the history of hydrocarbon production and expulsion from the sedimentary formation.
In this embodiment, the formation thermal event mainly includes the magma invasion and hydrocarbon production and drainage, and the magma invasion time and the hydrocarbon production and drainage time can be obtained by using the means commonly used in the art, and in some embodiments, the magma invasion time can be obtained by the related geological data in the region, and the hydrocarbon production and drainage history can be determined according to the vitrinity degree in the sedimentary stratum.
In some embodiments, after determining the migration kinetics of the effusion fluid, the location at which the effusion fluid migrates may be further determined based on the migration kinetics of the effusion fluid.
It can be understood that after the migration dynamics of the exuded fluid is determined, based on the structural distribution and the migration dynamics of the region in which the sandstone uranium ore body is located, the migration process of the exuded fluid can be simulated, and then the migration position of the exuded fluid can be determined.
Specifically, in some embodiments, if the migration kinetics of the exudate fluid are determined to be compressive stress driven, then the location where the exudate fluid migrates may be determined to be the region where the fractures and/or folds are located. If the power of the effusion fluid's migration is determined to be thermally buoyant, then the location at which the effusion fluid's migration occurs may be determined to be the region of the heat source.
The determination of the migration position of the exudative fluid is helpful for analyzing the action range of the exudative fluid, so that the uranium mineralization range is defined, and the sandstone uranium ore exploration work is guided.
Further, as described above, the exudation fluid may migrate for a plurality of times, and the migration dynamics of each migration may be different, and the determination of the position of the exudation fluid at each migration helps to analyze the mineralization process of the sandstone uranium ore body, so that the range of uranium mineralization can be accurately defined.
In some embodiments, after determining the migration time of the exudation fluid, the migration time of the exudation fluid may also be compared to the mineralization age of the sandstone uranium deposit.
The advantage of comparing the migration time of the exudation fluid with the mineralizing age is that, on the one hand, if the migration time of the exudation fluid and the mineralizing age match, the correlation between the sandstone uranium deposit and the action of the exudation fluid can be further verified, i.e. the sandstone uranium deposit formed under the action of the exudation fluid is further defined, avoiding erroneous judgment. While also ensuring the accuracy of the determined exuding fluid migration kinetics and migration time by mutual temporal verification.
On the other hand, as described above, the exudation fluid may migrate for many times during the mineralization process, and accordingly, the sandstone uranium deposit is also formed through many times of modification, so that the measurement results of the mineralization age of the uranium ore of different grades may be different, and the measured mineralization age and the migration time of the exudation fluid are compared, so that the migration process of the exudation fluid can be corresponded to the mineralization process of the sandstone uranium deposit, which is helpful for analyzing the mineralization process and further clarifying the mineralization mechanism.
In some embodiments, as described above, the mineralization ages of different grades of uranium ore may be different, corresponding to the effect of the exuding fluid on different stages of migration, and thus, the mineralization ages of different grades of uranium ore in a sandstone uranium deposit may be determined separately to facilitate a more comprehensive analysis of the mineralization process.
The different grade uranium ores may specifically include relatively low grade (for example, less than 0.05%) uranium ores and relatively high grade (for example, greater than 0.1%) uranium ores, and those skilled in the art can reasonably select which grade uranium ores to use for the measurement of the ore forming age according to the grade distribution of the uranium ores in the sandstone uranium deposit obtained in practice, without limitation. The determination of the mineralizing age can be achieved by methods commonly used in the art and will not be described herein.
In some embodiments, an mineralization process model for a sandstone uranium deposit may be constructed further based on migration kinetics and migration times of the exudation fluids, and an mineralization age of the uranium ore.
Specifically, a bleeding fluid development and migration process can be constructed based on migration power and migration time of the bleeding fluid, and then the development and migration process of the bleeding fluid can be made to correspond to the mineralization age of the uranium ore, so that an mineralization time line of the sandstone uranium deposit is constructed, and the construction of an mineralization process model of the uranium deposit is completed based on a general mechanism of uranium mineralization.
A schematic of the development and migration process of exudative fluids constructed in one example is shown in fig. 3.
The 3A stage is based on the structural distribution of the heat settlement stage (the stubbling effect) determined in the structural evolution process, and continuous burial caused by the stubbling effect is displayed through the heat history simulation result of the apatite fission trace until the 3B stage.
And determining that the hydrocarbon source rock (sedimentary stratum) in the 3B stage enters a mature stage according to the hydrocarbon expulsion history in the structural evolution process, wherein the exudation fluid starts to develop and migrate, a small amount of the exudation fluid 31 directly enters the upper stratum from the hydrocarbon source rock along the main fault, and the most of the exudation fluid 31 enters the fracture-stubborn unconformity surface along the fracture in the fracture period and is upwards dispersed along sand bodies in the sand-containing stratum.
After the 3C stage, the thermal history simulation result of the apatite fission tracks is used for determining that the basin is in a non-deposition and denudation state for a long time, and the exudation fluid 31 developed in the 3B stage is largely exuded and migrates upwards under the action of strong extrusion stress corresponding to the regional extrusion event of the land.
During the 3D phase, no evidence of significant exudate fluid migration was found until the 3E phase, which indicated that a formation thermal event occurred during this phase in the development of the formation, at which time, upon perturbation of the heat source, exudate fluid 31 migrates upward driven by thermal buoyancy.
In the above-demonstrated development and migration of exudate fluid, the fluid migration occurring in the 3B and 3E stages was determined based on the migration kinetics and migration times of exudate fluid determined above, while the other stages were supplemented with blank time points in the development and migration of exudate fluid based on the general principles of the formation evolution process and exudate fluid development and migration.
Further, based on the development and migration process of the seepage fluid constructed in the above, an mineralization process model of a sandstone uranium ore deposit can be constructed by combining the mineralization ages of the uranium ores, and a schematic diagram of the mineralization process model constructed in one embodiment is shown in fig. 4, wherein arrows indicate migration of the seepage fluid.
In this example, the ore forming ages of the uranium ores with the grade less than 0.05% and the grade greater than 0.1% are measured, and comparison shows that the ore forming age of the uranium ores with the grade less than 0.05% matches the 3C stage described above, and the ore forming age of the uranium ores with the grade greater than 0.1% matches the 3E stage described above, and the ore forming process in this example is considered to have undergone 4 stages by combining the general mechanism of uranium ore forming.
The 4A stage corresponds to the 3B stage, as described above in connection with fig. 3 and 4, in which the exuded fluids begin to develop and escape upwards, at which point the oxidized sand bodies begin to undergo a reduction reaction by the exuded fluids and the uranium deposit 41 is in the precipitation pre-enrichment stage. The 4B stage corresponds to the 3C stage, in which the bleed fluid starts to bleed out in large quantities and migrates upwards under the effect of the extrusion stress, and the uranium deposit 41 also enters the bleed mineralization stage with a large migration of the bleed fluid. The 4C stage corresponds to the 3D stage, in which the effect of the compressive stress is lost, but there is still some migration of the exuded fluids, at which point the uranium deposit 41 enters the multi-level mineralization stage. The 4D stage corresponds to the 3E stage, and in the stage, due to disturbance of a heat source, seepage fluid moves upwards under the driving of thermal buoyancy, enrichment of uranium in the uranium deposit 41 is promoted again, and the uranium deposit 41 enters a superposition heat transformation supernormal enrichment stage.
In the embodiment, an ore forming process model of the sandstone uranium deposit is constructed on the basis of the migration power and migration time of the exudation fluid and the ore forming age of the sandstone uranium deposit, the ore forming mechanism of the sandstone uranium deposit is clarified, and the method has important guiding significance for the follow-up exploration work carried out on the sandstone uranium deposit.
In some other embodiments, the mineralizing process model may be further refined in combination with the migration position of the effusion fluid determined above during the process of constructing the mineralizing process model, or may be further refined in consideration of other mineral-controlling elements, without limitation.
The method of one or more of the above embodiments is described and supplemented in greater detail below with the determination of the migration kinetics and migration times of the exudation fluids carried out on uranium deposits in the form of dicy Hadamard plots.
Based on previous research, the dicy Hadamard diagram uranium deposit is determined to be a sandstone uranium deposit formed under the action of exudation fluid, and therefore, an ore sample is collected in an industrialized uranium ore hole in the uranium deposit. The collected ore samples are ground into optical sheets, and the existence of soluble flowing organic matters in the uranium ores is found under an optical mirror, and the organic matters and the uranium ores are closely symbiotic, so that the formation of uranium is further indicated through the effect of exudation fluid.
Then, light oil inclusion showing light blue strong fluorescence is observed in a high-grade ore sample, which represents the seepage of deep organic fluid, and the temperature of the fluid inclusion is measured, wherein the temperature measurement result indicates that the uniform temperature is 100-125 ℃, and the uniform temperature in part of the sample can reach 175 ℃.
Next, the system studies the regional structure evolution and dynamic background after the deposition of the ore-bearing target layer of the two-pot land. The target layer of the Hada map deposit is the upper part of the Chalker's lineage and belongs to the thermal settlement stage (stubborn effect) after the valley breaking effect stops. The preceding valley splitting action forms a series of trap control positive faults, and although most of them end up in the sehan group, a small part of them continue to move in the upper deposition period of the sehan group.
The heat history simulation result of the apatite fission track shows that continuous burial caused by the stubborn effect lasts to the end of the second group deposition of the upper chalk system (115-72 Ma). The time reaches the deepest burial moment of the sediment in two basins in succession. Determining that the hydrocarbon source rock in the rising section enters a maturation stage according to the hydrocarbon discharge history in the pit of the Saohara in the adjacent area, wherein the vitrinite maturation degree Ro is 0.7-1.2%, the maturation degree of the Alkan hydrocarbon source rock is slightly higher than that in the rising section, and the vitrinite maturation degree Ro is 0.8-1.4%, which is the time point when the exudation fluid starts to develop and migrate.
The thermal history simulation of the apatite fission tracks further showed that the pan-in-pan was left in a non-sedimented and denuded state for a long period of time after the deposition of the pan-in-pan group until the deposition of the original New Turmanha group (72-45 Ma), corresponding to a regional squeeze event in the northeast Asia region, indicating that this time period was the time of the build-up.
Meanwhile, structural thermal events of the late middle generation-the new generation of the Lianlian basin are collected and sorted systematically, and mainly comprise basalt eruption events of 15.42-0.16 Ma in the Abagaqi region.
In the temperature measurement result, the uniform temperature of most fluid inclusions is 100-125 ℃, the temperature is matched with the deposition and burial temperature and is smaller than the first preset value, the temperature is low-temperature fluid, the exudation fluid which migrates under the driving of extrusion stress exists, and the exudation time is the time (72-45 Ma) for structure lifting determined in the above.
Meanwhile, the uniform temperature of a part of fluid inclusion reaches 175 ℃, is obviously higher than the deposition and burial temperature and is greater than a second preset value, the fluid is medium-high temperature fluid, the condition that the migration power is seepage fluid driven by thermal buoyancy exists, and the migration time is the time (15.42-0.16 Ma) for the occurrence of the construction thermal event.
Next, isotope age tests were performed on the lower grade (less than 0.05%) uranium ore and the higher grade (greater than 0.1%) uranium ore in the hadamard deposit, and the results indicated that the lower grade (less than 0.05%) ore of the hadamard deposit had the age of 62.4 Ma and 48.3 Ma all rocks U-Pb, and that the high-precision dating of pyrite Re-Os in the mineralization stage was 53Ma, which is consistent with the migration time of migration of the exudation fluid driven by compressive stress as determined above (72-45 Ma). The Hadamard plot high grade (more than 0.1%) uranium ore is formed in 16.0-3.2 Ma, which is consistent with the migration time of the exudation fluid under the drive of thermal buoyancy (15.42-0.16 Ma) determined above.
The present invention has been described in detail with reference to the drawings and examples, but the present invention is not limited to the examples, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention. The prior art can be adopted in the content which is not described in detail in the invention.

Claims (11)

1. A method of determining migration kinetics and migration time of a sandstone uranium ore exudation fluid, comprising:
collecting an ore sample in a sandstone uranium deposit;
determining a fluid temperature of a fluid exuding in a fluid inclusion of the ore sample;
determining a structural evolution process of the region where the sandstone uranium deposit is located;
determining the migration kinetics and the migration time of the exuded fluid, wherein,
if the temperature of the fluid is determined to be smaller than a first preset value, determining that the migration power of the exuded fluid is driven by extrusion stress, and determining that the migration time of the exuded fluid is the time of the structure lifting in the structure evolution process;
and if the fluid temperature is determined to be greater than a second preset value, determining that the migration power of the seepage fluid is driven by thermal buoyancy, and determining that the migration time of the seepage fluid is the time of the occurrence of the structural thermal event in the structural evolution process.
2. The method of claim 1, wherein the determining the tectonic evolution of the area in which the sandstone uranium deposit is located comprises:
and determining the time for the formation lifting in the area where the sandstone uranium deposit is located by means of a low-temperature thermal chronology method.
3. The method of claim 1, wherein the determining the tectonic evolution of the area in which the sandstone uranium deposit is located comprises:
and determining the time of the formation thermal event in the region of the sandstone uranium deposit based on the magma invasion time in the region of the sandstone uranium deposit and the hydrocarbon production and discharge history of the sedimentary stratum.
4. The method of claim 3, wherein the determining the tectonic evolution of the area in which the sandstone uranium deposit is located comprises:
determining a hydrocarbon production and expulsion history of the sedimentary formation based on vitrinite thermal maturity in the sedimentary formation.
5. The method of claim 1, further comprising:
determining a location at which the seepage fluid migrates based on the migration kinetics of the seepage fluid.
6. The method according to claim 5, wherein if the migration dynamics of the effusion fluid is determined to be compressive stress driven, the location where the effusion fluid migrates is determined to be the region where fractures and/or wrinkles are located;
and if the migration power of the exuded fluid is determined to be driven by thermal buoyancy, determining the position where the exuded fluid migrates as the area where the heat source is located.
7. The method of claim 1, further comprising:
after determining the time to migration of the effusion fluid, comparing the time to migration of the effusion fluid to an mineralizing age of the sandstone uranium deposit.
8. The method of claim 7, further comprising:
and respectively measuring the mineralization age of the uranium ore with different grades in the sandstone uranium deposit.
9. The method of claim 8, further comprising:
and constructing an mineralization process model of the sandstone uranium deposit based on the migration power and migration time of the exudation fluid and the mineralization age of the uranium ore.
10. The method of claim 1, wherein the determining a fluid temperature of a leaching fluid in a fluid inclusion of the ore sample comprises:
determining fluid inclusions in the ore sample that fluoresce blue;
and measuring the temperature of the fluid inclusion emitting blue fluorescence to determine the fluid temperature of the exuded fluid.
11. The method of claim 1, wherein the collecting an ore sample in a sandstone uranium deposit comprises:
determining a uranium deposit of the exudative sandstone uranium ore;
collecting the ore sample in industrial mineralization holes of the uranium deposit.
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