CN114034838B - Method for locating oil gas dissipation and sandstone type uranium ore body space in multi-energy basin - Google Patents
Method for locating oil gas dissipation and sandstone type uranium ore body space in multi-energy basin Download PDFInfo
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Abstract
The invention belongs to the technical field of sandstone-type uranium ores, and particularly relates to a method for positioning oil gas dissipation and sandstone-type uranium ore body space in a multi-energy basin. According to the method, researches are carried out on direct and indirect marks of oil gas escape, oil gas large-scale escape time and uranium minescence age, and the influence of oil gas large-scale escape on the formation and positioning of sandstone-type uranium ores is ascertained by combining the effect of oil gas on uranium precipitation enrichment, so that the efficiency and accuracy of sandstone-type uranium ores in the oil-uranium symbiotic multi-energy basin are improved.
Description
Technical Field
The invention belongs to the technical field of sandstone-type uranium ores, and particularly relates to a method for oil gas dissipation and sandstone-type uranium ore body space positioning in a multi-energy basin.
Background
The domestic sandstone type uranium ores are mostly produced in the multi-energy basin, so that the distribution rules of the inner oil gas-side uranium ores and the lower oil gas-upper uranium ores are formed overall, and researchers have researched the spatial relationship between the oil gas reservoirs and the uranium deposits in the basin, consider that the oil-uranium has a tight space-time distribution relationship, and establish a corresponding ore-forming pattern diagram. In addition, extensive research has considered that oil and gas affects uranium ore body formation mainly through adsorption, complexation, and reduction. However, the uranium ore geologist actually researches the difference of the time of the oil gas escaping to the ore layer of the uranium ore (before, during and after the uranium ore formation) in the ore formation process of the sandstone type uranium ore, and the obvious difference exists between the action of the oil gas in the uranium ore formation process and the marking of the space of the uranium ore body: (1) the oil gas escapes earlier than uranium mineralization, so that a stronger reduction environment and reducing substances required by uranium precipitation enrichment can be provided for uranium mineralization, which is particularly important for red variegated clastic rock construction, such as a Bush's mineral deposit produced at the northwest edge of a Tarim basin, and the uranium ore body is controlled by the distribution range of early oil gas organic matters-bitumen; (2) oil gas dissipation and uranium mineralization are synchronous, oil gas increases reduction capacity in an ore-bearing layer on one hand, is beneficial to uranium mineralization, and on the other hand, prevents surface oxygen-containing uranium-containing water from migrating to the deep part, and at a certain balance interface, uranium mineralization is always developed to form a large uranium-rich ore body, such as a uranium ore deposit of a Qianliao store in the south of a Songli basin, and the uranium ore body is produced around a construction skylight in a seepage (oxygen-containing uranium-containing water) seepage (oil gas) dual-superposition geochemistry environment; (3) oil gas dissipation is later than the uranium ore-forming period, can protect ore bodies formed in early stage, and meanwhile, can reduce an early yellow oxidation zone to be grey green or blue for the second time, and particularly can mask characteristic marks of uranium ores, so that difficulty in uranium ore exploration is brought, such as eastern uranium deposit in the Hudos basin, and the uranium ore bodies are produced in a transition zone between green sandstone and gray sandstone. Based on the analysis, the determination of the oil gas escape time in the multi-energy basin is important for uranium deposit formation, uranium deposit positioning and positioning marks, and is an important index for basin mining and evaluating basin uranium potential.
Disclosure of Invention
The invention aims to provide a method for locating oil-gas dissipation and sandstone-type uranium ore body space in a multi-energy basin, which is used for researching oil-gas dissipation direct and indirect marks, oil-gas large-scale dissipation time and uranium ore age, finding out the influence of oil-gas large-scale dissipation on the formation and location of sandstone-type uranium ore uranium ores by combining the effect of oil-gas on uranium precipitation enrichment, and improving the efficiency and accuracy of sandstone-type uranium ore prospecting in the oil-uranium symbiotic multi-energy basin.
The technical scheme adopted by the invention is as follows: a method for locating the space of oil gas dissipation and sandstone type uranium ore bodies in a multi-energy basin specifically comprises the following steps:
step (1) determining transformation of sandstone uranium ores in multi-energy basin to suffer from oil and gas emission
Collecting data on geological response aspects of oil and gas dissipation in a research area, wherein the data comprise a direct mark and an indirect mark of the oil and gas dissipation;
and (2) determining the oil gas escape time and the oil gas escape period, wherein the method comprises the following specific steps of:
step (2.1) collecting a sandstone sample of a ore layer in a sandstone type uranium deposit area;
step (2.2) grinding the fluid inclusion piece and measuring the temperature of the oil gas inclusion aiming at the sample in the step (2.1), and determining the temperature peak values of different generation sample inclusions;
step (2.3) performing apatite single-mineral selection and inversion of thermal evolution history of the mineral bearing layer structure on the sample obtained in the step (2.1) to obtain an optimal temperature-time curve graph of the fission track of the mineral bearing layer;
step (2.4) according to the uniform temperature peak value obtained in the step (2.2) and the optimal temperature-time curve graph of the fission track of the mineral seam obtained in the step (2.2), determining the large-scale escape time and the period of oil gas;
step (3) determination of ore age and stage number of sandstone type uranium ores
The ore formation age and the period of the sandstone-type uranium ore are determined by adopting a sandstone sample of an ore-bearing layer of the sandstone-type uranium ore and adopting an isochrone annual method of all-rock and U-Pb isotopes of the uranium ore and combining the correction of U-Ra;
step (4) determination of sandstone type uranium deposit forming process and ore body space positioning and positioning mark
And (3) on the basis of determining that the sandstone-type uranium deposit in the research area is subjected to the oil gas dissipation transformation, comparing the oil gas dissipation time indirectly determined by adopting the fluid inclusion inter-bearing determination method obtained in the step (2) with the ore formation age of the sandstone-type uranium deposit in the research area obtained in the step (3), and determining the space positioning and positioning marks of the sandstone-type uranium deposit and the ore body.
The direct signs of oil and gas escape in the step (1) comprise surface oil and gas seedlings, tar sands, asphalt veins, ceresin, underground thickened oil, asphalt and tar sands; indirect markers of hydrocarbon emissions include the alteration effect of interactions with surrounding rock during hydrocarbon emissions and their geochemical mechanisms of action.
The sandstone sample in the step (2.1) comprises a mineral rich sample and a mineral free sample.
In the step (2.2), the rich ore sample is glued first, and then the fluid inclusion sheet is ground on the rich ore sample.
When the fluid inclusion sheet is ground in the step (2.2), the formation generation of the inclusion is ascertained through the study of fluid inclusion sheet lithology and microbeam fluorescence spectrum, and the hydrocarbon-containing brine inclusion or the brine inclusion group symbiotic with the hydrocarbon inclusion is selected to complete the measurement of uniform temperature, and the temperature peak value of the inclusion in different generations is determined through the data statistical analysis of the uniform temperature.
The specific steps of apatite single mineral selection and inversion of the thermal evolution history of the mineral bearing layer structure of the non-mineral sample in the step (2.3) are as follows: carrying out coarse crushing, fine crushing, screening, elutriation, magnetic separation and heavy liquid separation on the mineral-free sample in the step (2.1), and carrying out targeting, neutron radiation and under-mirror fission track statistics on the apatite single minerals in the selected mineral-free sample to obtain the fission track length and age; and performing ore layer thermal evolution Shi Fanyan on the apatite single minerals, and fitting an optimal temperature-time curve chart of the fission track of the ore layer.
And (2.4) projecting the uniform temperature peak value obtained in the step (2.2) onto the optimal temperature-time curve graph of the fission track of the mineral seam obtained in the step (2.3), thereby indirectly determining the time and the period of large-scale dissipation of the basin oil gas.
The specific steps of the ore age and the period of the sandstone type uranium ores in the step (3) are as follows: and (3) sampling is carried out on sandstone-type uranium ore drilling cores, each group of sandstone samples comprise rich ore sandstone, ore-containing sandstone and lean ore sandstone, after sample breaking, the U-Pb isotope isochrone age of the uranium ore all-rock is measured, and the U-Pb isotope isochrone age of the all-rock is corrected by combining the Ra content of the samples.
In the step (3), an ISOPROBE-T thermal surface ionization mass spectrometer and an age determination method of asphaltic uranium ore and crystalline uranium ore are adopted to determine the isochrone age of U-Pb isotope of the uranium ore all-rock.
In the step (4), the specific steps of comparing the time of indirectly determining the oil gas dissipation by the fluid inclusion indirect determining method obtained in the step (2) with the main ore age of the sandstone-type uranium ore in the research area obtained in the step (3) are as follows: if the oil gas escape time is greater than or equal to the ore age of the sandstone-type uranium ores, proving that the oil gas escape occurs before the uranium ores, and the escaping oil gas can provide a stronger reduction environment and reducing substances required by uranium precipitation enrichment for the later uranium ore process; if the oil gas escape time is smaller than the ore age of sandstone-type uranium ores, the escaping oil gas can protect early-formed ore bodies, the early-stage yellow oxidation zone is reduced to green again, and the uranium ore bodies are positioned between the secondary reduction paleoxidation zone and the reduction zone.
The beneficial technical effects of the invention are as follows: according to the method, problems found in the exploration and research processes of sandstone-type uranium ores are taken as cut-in points, namely, the difference of the time from the oil gas escape to the ore bearing layer of the uranium ores (before, during and after uranium ore formation) is taken as a cut-in point, and the effect of the oil gas in the uranium ore formation process and the determination of the uranium ore space as a mark are obviously different. The method of the invention utilizes an improved method of establishing years between fluid inclusion bodies to accurately determine the time of oil gas escaping to a uranium ore deposit, and avoids the time of hydrocarbon source rock hydrocarbon discharge, oil gas accumulation and oil gas accumulation damage escaping in a basin as the time of oil gas escaping and acting on sandstone type uranium ores in the research process; the ore formation age of the sandstone-type uranium ores is determined by a method of isochronal line dating of all-rock or uranium minerals U-Pb isotopes, a time sequence of oil gas escape and uranium ore formation is established, and the effect of the oil gas escape on the uranium ore formation is ascertained by combining with geological response research of the oil gas escape process, so that positioning marks of uranium ore bodies under different conditions are determined.
Drawings
FIG. 1 is a flow chart of a method for locating the space of a hydrocarbon reservoir and a sandstone-type uranium deposit ore body in a multi-energy basin provided by the invention;
FIG. 2 is a schematic diagram of the geological map of the southbound uranium deposit of the illite basin;
FIG. 3 is a graph of the time of escape of coal bed gas from the inversion of the fluid inclusions of the leading sandstone type uranium ores and apatite fission tracks in the illite basin;
FIG. 4 is a chart of U-Pb isotope isochrone mineous age of the Alternaria basin leading sandstone uranium deposit;
FIG. 5 is a chart of the spatial localization of hydrocarbon emissions and sandstone-type uranium ore bodies in a multi-energy basin;
FIG. 6 is a schematic diagram of the planar distribution of the depletion of sandstone-type uranium ores and oil and gas in the North of the Erdos basin;
FIG. 7 is a diagram of oil and gas escape time for the combined specification of the volume of sandstone-type uranium deposit fluid in the north of the Erdos basin and the apatite fission track inversion;
fig. 8 is a diagram of the U-Pb isotope isochrone mineous age of the North-edge sandstone uranium deposit of the Erdos basin.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples.
As shown in fig. 1, a method for locating the space of a petroleum gas dissipation and sandstone type uranium deposit ore body in a multi-energy basin specifically comprises the following steps:
step (1) determining transformation of sandstone uranium ores in multi-energy basin to suffer from oil and gas emission
Data on geological response of oil and gas escape of a research area is collected, wherein the data comprise direct marks for determining the oil and gas escape of earth surface oil and gas seedlings, tar sand, pitch veins, ceresin and underground thickened oil, pitch and tar sand, and indirect marks for alteration effects (green sandstone and white sandstone) and geochemical action mechanisms of alteration effects interacting with surrounding rocks in the oil and gas escape process, so that the sandstone type uranium deposit of the research area is determined to be subjected to the transformation of the oil and gas escape.
The surrounding rock comprises green sandstone and white sandstone.
And (2) determining the oil gas escape time and the period, wherein the method specifically comprises the following steps of:
step (2.1) collecting a sandstone sample containing ore layers in a sandstone type uranium deposit area to obtain a rich ore sample and a lean ore sample for sampling
Carrying out sandstone samples on drilling cores of ore layers of sandstone-type uranium ores, and particularly carrying out rich ore samples and non-ore samples on the drilling cores of the sandstone-type uranium ores, wherein the rich ore samples are massive coarse sandstone, and are 3cm multiplied by 6cm multiplied by 9cm and used for making fluid inclusion; the mineral-free sample is coarse sandstone-coarse sandstone containing gravel, the content of the sample is about 5-10Kg, and the sample is used for selecting apatite single minerals.
Step (2.2) grinding fluid inclusion pieces and measuring temperature of oil gas inclusion for the rich ore sample in the step (2.1), and determining temperature peaks of different generations of rich ore sample inclusion
And (2) gluing the rich mineral sample in the step (2.1) by using 502 glue, and then grinding the rich mineral sample fluid inclusion sheets, wherein the specific steps are as follows: firstly, researching the open lithology and the microbeam fluorescence spectrum of the fluid inclusion piece to find out the cause generation of the oil gas inclusion. Then selecting a hydrocarbon-containing brine inclusion or a brine inclusion group symbiotic with the hydrocarbon inclusion to complete the measurement of the uniform temperature, wherein the method comprises the following steps: soaking the oil-gas inclusion sheet with hydrocarbon-containing saline (acetone), removing gum unloading glass slide, selecting larger saline inclusion with clear phase boundary and cavity wall and symbiotic with hydrocarbon inclusion (oil-gas inclusion), testing, cooling to completely freeze, and slowly heating to-56 deg.C at a speed of 0.5 deg.C/min to observe the presence or absence of CO in inclusion 2 、CH 4 A volatile component; then continuously heating at a speed of 0.5 ℃/min, observing the completely uniform temperature of the inclusion, and finally determining the temperature peak values of the inclusion of different generations through data statistical analysis of the uniform temperature;
step (2.3) performing apatite single-mineral selection and inversion of thermal evolution history of the mineral bearing layer structure on the non-mineral sample in the step (2.1) to obtain an optimal temperature-time curve chart of the mineral bearing layer fission track
Carrying out coarse crushing, fine crushing, screening, elutriation, magnetic separation and heavy liquid separation on the mineral-free sample in the step (2.1), and selecting apatite single minerals (more than 100 grains) in the mineral-free sample subjected to the treatment under a binocular; sequentially carrying out target making, neutron radiation and under-mirror fission track statistics on the selected apatite single minerals to obtain the length and age of the fission track; and performing ore layer thermal evolution Shi Fanyan on each apatite single mineral by using the HeFTy software, and fitting an optimal temperature-time curve graph of the ore layer fission track.
By adopting low-temperature thermal chronology theory and method and combining sandstone-type uranium deposit region structure evolution analysis, a sandstone-type ore deposit-containing layer structure-thermal evolution history is remolded.
Step (2.4) determining the large-scale escape time and the period of the oil gas according to the uniform temperature peak value obtained in the step (2.2) and the optimal temperature-time curve chart of the fission track of the mineral deposit obtained in the step (2.2)
Projecting the uniform temperature peak value obtained in the step (2.2) onto the optimal temperature-time curve graph of the fissile track of the mineral bearing layer obtained in the step (2.3), thereby indirectly determining the time and the period of large-scale dissipation of the basin oil gas.
Step (3) determination of ore age and stage number of sandstone type uranium ores
Performing systematic sampling on drilling cores of ore-bearing layers of sandstone-type uranium ores, wherein each group of sandstone samples (more than 5) comprises rich ore sandstone, ore-bearing sandstone and lean ore sandstone; through sample breaking, an ISOPROBE-T thermal surface ionization mass spectrometer is adopted, an age determination method of asphaltic uranium ores and crystalline uranium ores is adopted to determine the U-Pb isotope isochrone age of all-rock uranium ores, and the Ra content of a sandstone sample is combined to correct the U-Pb isotope isochrone age of all-rock uranium ores, so that the ore formation age and the ore formation time of all-rock uranium ores are determined.
In addition, a proper amount of uranium minerals can be selected from the rich ore samples, and the uranium ore samples are used for isotopy and dating of U-Pb isotopes of the uranium minerals.
Step (4) determination of sandstone type uranium deposit forming process and ore body space positioning and positioning mark
And (3) on the basis of specifying that the sandstone-type uranium deposit in the research area is subjected to the reconstruction of the escaping oil gas, comparing the oil gas escaping time indirectly specified by adopting the fluid inclusion inter-bearing annual fixing method obtained in the step (2) with the ore age of the sandstone-type uranium deposit in the research area obtained in the step (3). If the oil gas escape time is greater than or equal to the ore age of the sandstone-type uranium ores, proving that the oil gas escape occurs before the uranium ores, and the escaping oil gas can provide a stronger reduction environment and reducing substances required by uranium precipitation enrichment for the later uranium ore process; for the construction of sandstone-type uranium ore mineral bearing layers of red variegated clastic rock, uranium ore bodies are controlled by the distribution range of early hydrocarbon-organic matter-bitumen; for the construction of the sandstone type uranium ore containing layer which is made of gray coal-bearing clastic rock, the sandstone type uranium ore is similar to typical interlayer oxidation zone sandstone type uranium ore, and ore bodies are controlled by oxidation zone front lines and positioned at oxidation-reduction transition positions, namely red-yellow sandstone and gray sandstone transition positions. If the oil gas escape time is smaller than the ore age of sandstone-type uranium ores, the fact that the oil gas escape occurs after uranium ores proves that the escaping oil gas can protect early-formed ore bodies, characteristic alteration is generated in the interaction process with rocks, and early-stage yellow oxidation zones are secondarily reduced to be grey green or blue; the uranium ore body is positioned between the secondary reduction ancient oxidation zone and the reduction zone, namely, is produced in a transition zone between green sandstone and gray sandstone, and the ancient oxidation zone subjected to secondary reduction is determined to be a key for ore finding under the condition, so that the oil gas dissipation in the multi-energy basin and the spatial positioning of the sandstone-type uranium ore body are completed.
The invention will now be described in further detail with reference to the accompanying drawings and examples, taking the south edge of the multi-energy basin ilow basin and the north edge of the edos basin as examples.
Example 1 Alternanthese sandstone type uranium deposit in illite basin
As shown in fig. 1, a method for locating the space of a petroleum gas dissipation and sandstone type uranium deposit ore body in a multi-energy basin specifically comprises the following steps:
step (1) modification of Alternanthera sandstone uranium ores in illite basin by hydrocarbon fluid dissipation
The illite basin is a multi-energy basin with multiple coexisting energy sources such as petroleum, coal, uranium and the like, but because sandstone-type uranium ores are produced at the position (the south edge of the illite basin) without a direct sign (oil seedlings and the like) of obvious oil gas escape, researches on later acidolysis hydrocarbon, fluid inclusion, alteration characteristics and altered mineral stable isotopes show that the sandstone-type uranium ores in the region are subjected to transformation of hydrocarbon fluids, but the hydrocarbon fluids are not oil gas, but the thermal cracking coal bed gas generated by decarboxylation of organic matters in coal formations of a sandstone-type uranium ore mineral layer coal series, the process is accompanied by the generation of a large amount of organic acid fluids, and kaolin petrochemicals and discolored white sandstone which are commonly developed in the ore layer are the result of the combined action of the coal bed gas escape and the organic acid fluids.
The method comprises the step (2) of determining the escape time of the coalbed methane
The coalbed methane can be divided into a free state, an adsorption state and a dissolution state according to the occurrence state, wherein the adsorption state can account for 70-95%, the free state accounts for about 10-20%, and the dissolution state is extremely small. The coal bed gas dissipation process comprises complex processes such as desorption, diffusion, seepage and the like, is controlled by construction activities and hydrodynamic conditions, pressure is released in the construction lifting process, and adsorbed gas is easy to desorb to form free gas and then is dissipated into a sandstone-type uranium ore deposit. Based on the analysis, the method can comprehensively apply the research of the inclusion of the fluid of the mineral seam and the thermal history simulation of the apatite fission track to accurately determine the time and the period of the escape of the coal bed gas.
The ore layer sandstone inclusion of the Nanli basin and the nanyuan sandstone-containing uranium ore is carefully researched, the oil gas inclusion of the 1 st development period and the salt water inclusion symbiotic with the natural gas inclusion have the uniform temperature of 63-87 ℃, and the ore layer undergoes early-middle dwarf Luo Shi (J) 1-2 ) Buried sedimentation stage, late dwarf Luo Shi (J) 3 ) -chalk (K) 1 ) Stage of rapid lifting, chalky late (K) 2 ) Ancient times (E) 1 ) Long-term relative stable phase, onset (E) 2 ) The rapid lifting stage is adopted, so that the coal bed gas is indirectly ensured to escape once, and the time is mainly between 76 and 105Ma (as shown in figure 3).
Step (3) determination of ore age and stage number of sandstone type uranium ores
The isochrone definite year study of the U-Pb isotopes of the all-rock and asphalt uranium ores shows that the ore formation ages of the Nanlian sandstone uranium ores of the Yili basin mainly comprise 33.8+/-3.5 Ma, 27.2+/-1.2 Ma, 19.8+/-6.2 Ma, 19.5+/-2.8 Ma, 19.0+/-0.99 Ma, 18.42+/-0.82 Ma, 17.9+/-0.36 Ma, 5.1+/-1.2 Ma and 4.0+/-1.0 Ma (figure 4), and the main ore formation ages are 33.8 Ma-4.0 Ma.
Step (4) determination of sandstone type uranium deposit forming process and ore body space positioning and positioning mark
Early-middle dwarf Luo Shi (J) 1-2 ) In the stage of burying and sedimentation, under the background of continuous extension and fracture of basin, a coal-bearing stratum containing ore layer is formed, and a plurality of rhythm layers which are favorable for the formation of mud (coal) -sand-mud (coal) lithology structure of interlayer oxidized band-type uranium ore are developed. In addition, the coal-based stratum generates a large amount of organic acid and CO which are significant for uranium migration in the burying process 2 And coal bed gas which is favorable for uranium precipitation, enrichment and ore formation, and only a small amount of the coal bed gas escapes into the sand body due to the adsorption effect of the coal bed, and most of the coal bed gas is in an adsorption state.
Late dwarf Luo Shi (J) 3 ) -chalk (K) 1 ) In the rapid lifting stage, the mineral bearing layer is lifted and inclined to form a slope belt, the pressure born by the slope belt is rapidly reduced, adsorbed gas in the coal bed gas can be promoted to be converted into free gas, the coal bed gas is desorbed and permeates into sandstone with high permeability, and meanwhile, a large number of cracks and cracks can be generated in the lifting process, so that a good channel can be provided for the migration of the desorbed coal bed gas, the content of a reducing medium in the sand body is increased, the reducing capacity is greatly increased, and the reduction capacity corresponds to the coal bed gas dissipation generated by 105-76 Ma.
Chalky late (K) 2 ) Ancient times (E) 1 ) In a long-term relatively stable stage, the surface uranium-containing oxygen-containing water runoff from the etching source region permeates into the interlayer sand body, so that not only is the desorption degree of the coalbed methane further increased, but also the surface uranium-containing oxygen-containing water runoff can interact with free gas in sandstone, on the one hand, UO is adopted 2 (CO 3 ) 3 4- Or hexavalent activated uranium which migrates in the form of an organic complex reacts with reducing substances such as free gas and the like to form tetravalent stable uranium minerals; on the other hand, SO in uranium-containing oxygen-containing surface water 4 2- Can be subjected to CH under the action of sulfate reducing bacteria 4 Reducing the isoreducing gas to H 2 S gas, H 2 S can reduce hexavalent uranium to form uranium minerals, and a strong reduction environment with oxygen deficiency and rich hydrogen sulfide is caused, so that the reduction capacity of the sand body is greatly improved, the Eh and pH value in the sand body of the ore layer are reduced, and favorable conditions are provided for enrichment and ore formation of uranium. Along with the continuous deep penetration of uranium-containing oxygen-containing surface water, uranium ore bodies are continuously enriched by oxidation migration-reduction, so that oxygen is generatedThe front line of the melting zone is continuously rolled and pushed into the basin to form a main ore body with the age of 33.8 Ma-17.9 Ma.
New year (E) 2 ) The uranium mineralization formed in the early stage is continuously migrated and reformed into the basin under the reforming action of uranium-containing oxygen-containing water in the etching source region and interacted with the dissipated coalbed methane, so that a 4Ma uranium ore body is formed.
The escape time (76-105 Ma) of the forward coalbed methane of the illite basin is longer than the main ore formation age (33.8 Ma-17.9 Ma) of the sandstone-type uranium ores, and the escape time is proved to be before the coalbed methane escapes from uranium-forming, so that the analysis of the forward coalbed methane of the illite basin can provide a stronger reducing environment and reducing substances required by uranium precipitation enrichment for the later uranium-forming process, when the surface uranium-containing oxygen water runoffs from an etching source area infiltrate into interlayer sand bodies, interact with the reducing substances such as the coalbed methane and form uranium ore bodies at oxidation-reduction transition positions, namely red-yellow sandstone and gray sandstone transition positions, and are strictly controlled by front lines of oxidation zones, and by using the ore body positioning mark, large uranium beds such as Hong Haigou, kujelter (512), wu Kuer, za Ji Sitan (511) and the like are found from the southwest to the forward in the forward of the illite basin, so that the forward coalbed of the illite basin becomes one of important uranium-forming patterns of the forward coalbed 2 (fig. 5).
Example 2 North edge sandstone uranium deposit of Erdos basin
As shown in fig. 1, a method for locating the space of a petroleum gas dissipation and sandstone type uranium deposit ore body in a multi-energy basin specifically comprises the following steps:
step (1) North edge sandstone uranium deposit of Erdos basin suffers from oil and gas loss reformation
The northeast part of the edo basin found more chalk-based oil seedlings (fig. 6), where the oil seedlings were distributed, the chalk-based oil seedlings were directly overlaid on the two-fold Dan Qianfeng group and below, whereas no oil and gas was seen where the chalk-based oil seedlings were in contact with the dwarf or three-fold, from which it was inferred that the chalk-based oil seedlings were derived from the last ancient kingdom. By comparing the physical properties, organized characteristics, carbon isotope composition characteristics, etc. of the chalk-based oil seedlings, the ancient oil sands in boreholes, the dwarf-based crude oil, and the fresh-based crude oil in the river basin, the scholars consider that the chalk-based oil seedlings (sands) have similar characteristics to those of the oil sands in the lower part of the two-layered stone box group and the Dan Qianfeng group, and are far from the characteristics of the raw oil in the southern horseback oil field and the fresh-based crude oil in the river basin. It can be seen that the chalk-based oil seedlings are condensate oil formed by the coal-based gas with higher maturity, and the oil source is not local. According to the characteristics of the type, uniform temperature, capturing pressure and variation of the fluid inclusion of the reservoir of the ancient world in the north of the basin and the research results of the drying coefficient of natural gas and methane carbon isotopes of the ancient world, chalk-based oil seedlings are caused by the dissipation of natural gas from the ancient world in the south to the northeast and the north.
The north sandstone-type uranium ores of the erdosbasin have large-scale green sandstone alteration zones and carbonation in the straight-through group of the ore deposit, and a large-scale sandstone bleaching phenomenon is also found at the top of the triad adjacent to the north sandstone-type uranium ores (figure 6), and the green sandstone, the white sandstone and the carbonation are all related to large-scale oil and gas dissipation effects of the area.
Step (2) determination of oil gas dissipation time
The lithology and microbeam fluorescence spectrum research on the fluid inclusion sheets shows that hydrocarbon inclusions can be divided into two phases according to the occurrence of minerals, colors and fluorescence, wherein the first phase mainly develops in the calcite cementation period, the development abundance is extremely high (GOI is 80% + -.), the inclusions are distributed in a bright crystal calcite cement in groups, wherein the liquid hydrocarbon inclusions which are brown and dark brown account for 70% + -.), and the gas hydrocarbon inclusions which are dark gray account for 30% + -.); the secondary development of the stage 2 is after the calcite cementation stage, the development abundance is moderately low (GOI is 2-3% + -.), the inclusion is distributed in a line or a strip along micro cracks after the diagenetic stage of cutting through quartz particles, or is distributed in a group or a strip along feldspar chip corrosion holes, and the inclusion is mainly brown and dark brown liquid hydrocarbon inclusion, and a small amount of gas hydrocarbon inclusion develops dark gray in individual vision. The result of the measurement of the uniform temperature of the brine inclusion symbiotic with the hydrocarbon inclusion and the comprehensive analysis show that the oil gas is filled into the ore-bearing layer on a large scale for two periods, the uniform temperature mode values are respectively 60-80 ℃ and 100-120 ℃ (figure 2), the obtained uniform temperature peak values are projected onto the heat evolution history of the ore-bearing destination layer at 60-80 ℃ and 100-120 ℃, the large-scale escape of the oil gas in the North edge sandstone-type uranium ore region of the Huidocella basin is mainly obtained, the oil gas is mainly in two periods, the time is respectively 98 Ma-121 Ma and 10 Ma-5 Ma (figure 7), and the oil gas accumulation time later than the Huidosis time of the Huidosis early chalk is the result of the secondary migration of the oil gas into the ore-bearing layer due to structural motion damage after the formation of the oil gas reservoir.
Step (3) determination of ore age and stage number of sandstone type uranium ores
The all-rock U-Pb isotope isochrone definite year study shows that the ore-forming ages of the North-edge sandstone uranium ores of the Erdos basin are mainly 94.5+/-2.7 Ma, 93.1+/-3.5 Ma, 83.1+/-2.4 Ma, 75.2+/-2.1 Ma, 67.8+/-2.4 Ma and 62.3+/-1.7 Ma, which correspond to late chalkiness and ancient new-age periods respectively (figure 8).
Step (4) determination of sandstone type uranium deposit forming process and ore body space positioning and positioning mark
The oil gas in the first period is dissipated to the uranium-bearing ore layer (98 Ma-121 Ma) in a large scale earlier than the main ore age of sandstone-type uranium ores, so that a stronger reduction environment and reducing substances required by uranium precipitation enrichment can be provided for the uranium ore effect, and a uranium ore body discovered in the current investigation is formed; the second-stage oil gas is filled to the uranium-bearing ore layer (10 Ma-5 Ma) on a large scale, and is later than the main ore age of sandstone-type uranium ores, so that early-stage formed ore bodies are protected, and meanwhile, early-stage yellow oxidation zones are reduced to be grey green or blue secondarily, so that the uranium ores are positioned between the secondary reduction ancient oxidation zones and the reduction zones, namely, are produced in a transition zone between green sandstone and gray sandstone, and are different from uranium ores with coiled interlayer oxidation zones. It is also recognized that oil and gas emissions protect early formed ore bodies later than uranium ore formation, and the early yellow oxidation zone is secondarily reduced to be grey green or blue, so that characteristic marks of uranium ores are covered (fig. 5), and by applying the ore body positioning marks, soap moat, nano-ridge ditch and large-scale uranium ore deposits are sequentially found at the north edge of the jaw basin, and recently, uranium ore places such as kunjin ditches, bayingqing ditches and Chai Deng are found, so that the northeast part of the jaw basin becomes one of important sandstone-type uranium ore zones in north China.
The present invention has been described in detail with reference to the drawings and the embodiments, but the present invention is not limited to the embodiments described above, 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 invention may be practiced otherwise than as specifically described.
Claims (10)
1. A method for locating the space of oil gas dissipation and sandstone type uranium ore bodies in a multi-energy basin specifically comprises the following steps:
step (1) determining transformation of sandstone uranium ores in multi-energy basin to suffer from oil and gas emission
Collecting data on geological response aspects of oil and gas dissipation in a research area, wherein the data comprise a direct mark and an indirect mark of the oil and gas dissipation;
and (2) determining the oil gas escape time and the oil gas escape period, wherein the method comprises the following specific steps of:
step (2.1) collecting a sandstone sample of a ore layer in a sandstone type uranium deposit area;
step (2.2) grinding the fluid inclusion piece and measuring the temperature of the oil gas inclusion aiming at the sample in the step (2.1), and determining the temperature peak values of different generation sample inclusions;
step (2.3) performing apatite single-mineral selection and inversion of thermal evolution history of the mineral bearing layer structure on the sample obtained in the step (2.1) to obtain an optimal temperature-time curve graph of the fission track of the mineral bearing layer;
step (2.4) according to the uniform temperature peak value obtained in the step (2.2) and the optimal temperature-time curve graph of the fission track of the mineral seam obtained in the step (2.2), determining the large-scale escape time and the period of oil gas;
step (3) determination of ore age and stage number of sandstone type uranium ores
The ore formation age and the period of the sandstone-type uranium ore are determined by adopting a sandstone sample of an ore-bearing layer of the sandstone-type uranium ore and adopting an isochrone annual method of all-rock and U-Pb isotopes of the uranium ore and combining the correction of U-Ra;
step (4) determination of sandstone type uranium deposit forming process and ore body space positioning and positioning mark
And (3) on the basis of determining that the sandstone-type uranium deposit in the research area is subjected to the oil gas dissipation transformation, comparing the oil gas dissipation time indirectly determined by adopting the fluid inclusion inter-bearing determination method obtained in the step (2) with the ore formation age of the sandstone-type uranium deposit in the research area obtained in the step (3), and determining the space positioning and positioning marks of the sandstone-type uranium deposit and the ore body.
2. The method for spatially locating the oil and gas emissions and sandstone type uranium deposit ore bodies in a multi-energy basin according to claim 1, wherein the method comprises the following steps of: the direct signs of oil and gas escape in the step (1) comprise surface oil and gas seedlings, tar sands, asphalt veins, ceresin, underground thickened oil, asphalt and tar sands; indirect markers of hydrocarbon emissions include the alteration effect of interactions with surrounding rock during hydrocarbon emissions and their geochemical mechanisms of action.
3. The method for spatially locating the oil and gas emissions and sandstone type uranium deposit ore bodies in a multi-energy basin according to claim 1, wherein the method comprises the following steps of: the sandstone sample in the step (2.1) comprises a mineral rich sample and a mineral free sample.
4. A method for spatial localization of a hydrocarbon-bearing and sandstone-type uranium deposit ore body in a multi-energy basin according to claim 3, wherein: in the step (2.2), the rich ore sample is glued first, and then the fluid inclusion sheet is ground on the rich ore sample.
5. The method for spatially locating the oil and gas dissipation and sandstone type uranium deposit ore body in the multi-energy basin according to claim 4, wherein the method comprises the following steps of: when the fluid inclusion sheet is ground in the step (2.2), the formation generation of the inclusion is ascertained through the study of fluid inclusion sheet lithology and microbeam fluorescence spectrum, and the hydrocarbon-containing brine inclusion or the brine inclusion group symbiotic with the hydrocarbon inclusion is selected to complete the measurement of uniform temperature, and the temperature peak value of the inclusion in different generations is determined through the data statistical analysis of the uniform temperature.
6. The method for spatially locating the oil and gas dissipation and sandstone type uranium deposit ore body in the multi-energy basin according to claim 5, wherein the method comprises the following steps of: the specific steps of apatite single mineral selection and inversion of the thermal evolution history of the mineral bearing layer structure of the non-mineral sample in the step (2.3) are as follows: carrying out coarse crushing, fine crushing, screening, elutriation, magnetic separation and heavy liquid separation on the mineral-free sample in the step (2.1), and carrying out targeting, neutron radiation and under-mirror fission track statistics on the apatite single minerals in the selected mineral-free sample to obtain the fission track length and age; and performing ore layer thermal evolution Shi Fanyan on the apatite single minerals, and fitting an optimal temperature-time curve chart of the fission track of the ore layer.
7. The method for spatially locating the oil and gas dissipation and sandstone type uranium deposit ore body in the multi-energy basin according to claim 6, wherein the method comprises the following steps of: and (2.4) projecting the uniform temperature peak value obtained in the step (2.2) onto the optimal temperature-time curve graph of the fission track of the mineral seam obtained in the step (2.3), thereby indirectly determining the time and the period of large-scale dissipation of the basin oil gas.
8. The method for spatially locating the oil and gas emissions and sandstone type uranium deposit ore bodies in a multi-energy basin according to claim 7, wherein the method comprises the following steps of: the specific steps of the ore age and the period of the sandstone type uranium ores in the step (3) are as follows: and (3) sampling is carried out on sandstone-type uranium ore drilling cores, each group of sandstone samples comprise rich ore sandstone, ore-containing sandstone and lean ore sandstone, after sample breaking, the U-Pb isotope isochrone age of the uranium ore all-rock is measured, and the U-Pb isotope isochrone age of the all-rock is corrected by combining the Ra content of the samples.
9. The method for spatially locating the oil and gas emissions and sandstone type uranium deposit ore bodies in a multi-energy basin according to claim 8, wherein the method comprises the following steps of: in the step (3), an ISOPROBE-T thermal surface ionization mass spectrometer and an age determination method of asphaltic uranium ore and crystalline uranium ore are adopted to determine the isochrone age of U-Pb isotope of the uranium ore all-rock.
10. The method for spatially locating the oil and gas emissions and sandstone type uranium deposit ore bodies in a multi-energy basin according to claim 9, wherein the method comprises the following steps: in the step (4), the specific steps of comparing the time of indirectly determining the oil gas dissipation by the fluid inclusion indirect determining method obtained in the step (2) with the main ore age of the sandstone-type uranium ore in the research area obtained in the step (3) are as follows: if the oil gas escape time is greater than or equal to the ore age of the sandstone-type uranium ores, proving that the oil gas escape occurs before the uranium ores, and the escaping oil gas can provide a stronger reduction environment and reducing substances required by uranium precipitation enrichment for the later uranium ore process; if the oil gas escape time is smaller than the ore age of sandstone-type uranium ores, the escaping oil gas can protect early-formed ore bodies, the early-stage yellow oxidation zone is reduced to green again, and the uranium ore bodies are positioned between the secondary reduction paleoxidation zone and the reduction zone.
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