CN112464456B - Sandstone type uranium deposit distant view evaluation method in basin edge strong oil gas reduction region of sedimentary basin - Google Patents
Sandstone type uranium deposit distant view evaluation method in basin edge strong oil gas reduction region of sedimentary basin Download PDFInfo
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- 229910052770 Uranium Inorganic materials 0.000 title claims abstract description 258
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 title claims abstract description 257
- 238000011156 evaluation Methods 0.000 title claims abstract description 63
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 62
- 230000008021 deposition Effects 0.000 claims abstract description 36
- 238000012216 screening Methods 0.000 claims abstract description 16
- 238000010587 phase diagram Methods 0.000 claims abstract description 13
- 238000013210 evaluation model Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 28
- 238000009933 burial Methods 0.000 claims description 27
- 230000033558 biomineral tissue development Effects 0.000 claims description 23
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 18
- 238000013178 mathematical model Methods 0.000 claims description 18
- 239000004576 sand Substances 0.000 claims description 15
- 239000013049 sediment Substances 0.000 claims description 15
- 238000005065 mining Methods 0.000 claims description 14
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 claims description 12
- DIKBFYAXUHHXCS-UHFFFAOYSA-N bromoform Chemical compound BrC(Br)Br DIKBFYAXUHHXCS-UHFFFAOYSA-N 0.000 claims description 12
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 9
- 238000005553 drilling Methods 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 239000010426 asphalt Substances 0.000 claims description 6
- 229950005228 bromoform Drugs 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 229910052762 osmium Inorganic materials 0.000 claims description 6
- 229910052702 rhenium Inorganic materials 0.000 claims description 6
- 238000003811 acetone extraction Methods 0.000 claims description 3
- 238000005349 anion exchange Methods 0.000 claims description 3
- 239000003957 anion exchange resin Substances 0.000 claims description 3
- 150000001450 anions Chemical class 0.000 claims description 3
- 239000003245 coal Substances 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
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- 238000010790 dilution Methods 0.000 claims description 3
- 239000012895 dilution Substances 0.000 claims description 3
- 238000004821 distillation Methods 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 239000011435 rock Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 239000002023 wood Substances 0.000 claims description 3
- 239000004215 Carbon black (E152) Substances 0.000 claims 7
- 229930195733 hydrocarbon Natural products 0.000 claims 7
- 150000002430 hydrocarbons Chemical class 0.000 claims 7
- 239000006185 dispersion Substances 0.000 claims 1
- 238000000926 separation method Methods 0.000 claims 1
- 238000000176 thermal ionisation mass spectrometry Methods 0.000 claims 1
- 238000011835 investigation Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 42
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000001819 mass spectrum Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
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Abstract
The invention belongs to the technical field of uranium ore exploration, and particularly relates to a sandstone type uranium ore perspective evaluation method in a basin edge strong oil-gas reduction region of a sedimentary basin, which comprises the following steps of firstly, establishing a stratum table; step two, screening uranium ore-forming layers; step three, delineating a sandstone-type uranium mine distant view evaluation area range; step four, determining the ore formation period of sandstone uranium; step five, determining the time of first large-scale oil gas overflow in the range of a sandstone-type uranium deposit distant view evaluation area; step six, compiling a layer deposition phase diagram of uranium mineralogy in a sandstone type uranium mine perspective evaluation area; and step seven, establishing a sandstone type uranium deposit perspective evaluation model in the region of strong oil gas reduction of the basin rim of the sedimentary basin. The invention synthesizes stratum, non-integrated surface, oil gas reduction, paleoxidation and sedimentary phase factors, can quantitatively evaluate sandstone type uranium deposit perspective in areas with strong oil gas reduction of basin edges of sedimentary basins, and provides evaluation parameters for sandstone type uranium deposit investigation in the areas.
Description
Technical Field
The invention belongs to the technical field of uranium ore exploration, and particularly relates to a sandstone type uranium ore perspective evaluation method in a basin rim strong oil gas reduction area of a basin.
Background
The strong oil gas reduction area of the sedimentary basin is characterized in that the basin is a exudation basin due to strong exudation of oil gas, so that the seepage of oxygen-containing uranium-containing fluid is inhibited, and the strong oil gas reduction effect is unfavorable for sandstone uranium ore formation. The oxidation zone and uranium mineralization possibly formed in the early stage are covered by strong oil gas action reduction, and the uranium mine is difficult to survey by searching an oxidation zone-redox transition zone-reduction zone mode, so that the prospect evaluation difficulty of sandstone type uranium mine in the area is greatly increased. Therefore, in order to solve the problem, a sandstone-type uranium deposit prediction method for the areas with strong basin edges of the sedimentary basins is required to be established to evaluate the uranium ore prospect of the areas.
Disclosure of Invention
The invention aims to solve the technical problems that the uranium ores are difficult to survey by searching an oxidation zone-oxidation-reduction transition zone-reduction zone mode and the sandstone type uranium ores in the region are difficult to evaluate in a distant view due to strong oil gas exudation in the region with strong oil gas reduction of a sedimentary basin.
The technical scheme of the invention is as follows:
the sandstone type uranium deposit perspective evaluation method for the region with strong oil gas reduction at the basin edge of the sedimentary basin comprises the following steps:
step one: establishing a stratum table; collecting and analyzing regional geology and drilling comprehensive data of a strong oil-gas reduction region of a sedimentary basin, and establishing a stratum information table of the region from bottom to top in time sequence by taking groups as units;
step two, a step two is carried out; screening uranium ore-forming layers; screening uranium ore-forming layers by taking groups as units according to the table established in the step one;
step three: delineating a sandstone-type uranium mine distant view evaluation area;
step four: determining the ore forming period of sandstone uranium;
Step 4.1: screening a layer sandstone type uranium ore formation period of uranium ore formation meshes;
step 4.2: establishing a uranium mineralization schedule of a uranium mineralization target layer;
step five: determining the time of first large-scale oil gas overflow in the range of a sandstone-type uranium ore perspective evaluation area;
Step six: compiling a layer deposition phase diagram of uranium mineralogy in a sandstone type uranium mine perspective evaluation area;
Step seven: establishing a sandstone type uranium deposit distant view evaluation model in a basin edge strong oil gas reduction region of a sedimentary basin;
step 7.1: evaluating parameter assignment;
step 7.2: establishing an evaluation mathematical model;
step 7.3: and evaluating the sandstone type uranium ore prospect in the region of strong oil gas reduction at the basin rim of the sedimentary basin.
The first step further comprises: the stratum information table includes: the primary color of the stratum, the color of the sandstone, whether carbon scraps are contained or not, the relation of stratum contact, the burial depth of all drilling stratum bottom plates, the thickness of the sandstone and the sand content are contained; the sandstone color comprises: conglomerate color; the sandstone thickness comprises: conglomerate thickness; the sand content comprises: sand content of conglomerate, sand thickness/formation thickness.
And step two, uranium mineralization mesh layer screening conditions comprise:
(1) The primary color of the stratum is grey;
(2) Carbon-rich cuttings or coal seam inclusion;
The number of uranium ore-forming target layers screened in the second step can be one or more, and the number of uranium ore-forming target layers is represented by S n, where n is the number of sequences of target layers, and n=1, 2, 3, …. All n appearing hereinafter are consistent with the meaning of n herein
The third step further comprises: according to the borehole stratum bottom plate burial depth counted by taking the group as a unit in the first step, compiling a uranium ore formation target layer S n bottom plate burial depth contour map screened in the second step by taking the group as a unit, taking a burial depth line of 1500m of the stratum bottom plate burial depth, wherein the burial depth line of 1500m of the stratum bottom plate burial depth is L n, and the n meaning is consistent with the n meaning in S n and the numerical value is kept consistent; l n corresponds to the formation floor burial line for the target layer numbered S n, e.g., L 2 corresponds to the formation floor burial line for the target layer numbered S 2; the maximum range defined by the aggregate of all L n is taken as the range of the distant view evaluation area of the sandstone-type uranium deposit, and the area A of the distant view evaluation area is calculated;
and (3) compiling the uranium ore formation target layer S n bottom plate burial depth contour map screened in the second step by taking the group as a unit, and endowing a projection coordinate system.
The step 4.1 further comprises: screening a sandstone type uranium ore formation period U nMj as an unconformity surface between a uranium ore formation layer and an overlying large-scale overburden layer according to the stratum table established in the first step, wherein n meaning is consistent with n meaning in S n, and the numerical values are kept consistent; j is the number of uranium ore formation periods of the uranium ore formation target layer with the number of S n, j=1, 2,3 and …; u nMj corresponds to the jth uranium mining stage of the uranium mining order layer numbered Sn, e.g., U 2M2 corresponds to the 2 nd uranium mining stage of the uranium mining order layer numbered S 2, each uranium mining order layer may have 1 to j sandstone uranium mining stages.
The step 4.2 includes: establishing a uranium mineralization schedule of a uranium mineralization target layer, including: establishing a uranium ore formation period table of a uranium ore formation target layer according to the sandstone type uranium ore formation period screened in the step 4.1, wherein the table comprises: the uranium ore formation target layer, the non-integrated surface corresponding to the uranium ore formation period and the non-integrated surface duration corresponding to the uranium ore formation period are in the unit of Ma, and the sum of the uranium ore formation period durations of the uranium ore formation target layer is in the unit of Ma;
The sum of the duration time sigma U n M of the uranium ore forming period of the uranium ore forming target layer,
Σu nM＝UnM1+UnM2+…+UnMj is the sum of the non-integrated surface durations corresponding to all uranium mining periods of the uranium mining target layer numbered S n.
The fifth step comprises the following steps:
Step 5.1: collecting oil sandstone samples in a uranium mineous layer according to a group unit in a range of a sandstone uranium ore perspective evaluation area defined in the third step, wherein the distances among the samples are uniformly distributed in the uranium ore perspective evaluation area; when the sample is collected, a wood tool is used for collecting the middle part of the rock core, and the sample is not weathered and is not polluted by metal; the weight of the sample is 200g, and the sample is stored by using a edge-pull sealing plastic bag;
Step 5.2: and 5.1, crushing the sample acquired in the step 5.1 to 80-100 meshes by using an agate grinding tool, placing the crushed sample in a Soxhlet extractor, adding 97% of tribromomethane and 3% of methanol for soaking for more than 4 hours, finally, separating solid from liquid by using filter paper, heating the liquid part until the tribromomethane volatilizes, and separating out the organic chloroform asphalt A.
Step 5.3: weighing 0.2g of chloroform asphalt A extracted in the step 5.2, and placing proper amounts of 185 Re and 190 Os diluent into a Carlos tube; inverse Wang Shuifa is used, namely: 116mol/L HNO 3 and 12mol/L HCl are continuously melted for 48 hours at 240 ℃; then separating and purifying Os by anion exchange method and micro-distillation method, and separating and purifying Re by anion exchange resin method or acetone extraction method; finally, measuring the abundance of each isotope of Re and Os by utilizing an isotope dilution anion thermal ionization mass spectrum (ID-NTIMS);
Step 5.4: and 5.3, measuring the abundance data of each isotope of Re and Os of each uranium-bearing ore-bearing layer, and calculating the calculated result to be the time T n of the first large-scale oil-gas overflow of the uranium-bearing ore-bearing layer in the range of a sandstone-type uranium ore perspective evaluation area (the n meaning is consistent with the n meaning in S n and the numerical value is kept consistent, and the unit is Ma of the first large-scale oil-gas overflow of the uranium-bearing ore-bearing target layer with the Tn mark number of S n).
The sixth step further comprises: step 6.1: according to the drilling sandstone thickness and the sand content counted in the first step, compiling a sediment phase diagram of the uranium mineralization target layer S n screened in the second step by taking a group as a unit;
And the programming range of the sediment phase diagram of the uranium mineralization target layer S n screened in the second step is determined by the range of the sandstone-type uranium ore distant view evaluation area outlined in the third step.
The step 7.1 of evaluating the parameter assignment further comprises the following steps:
Step 7.1.1: setting evaluation parameter values of uranium ore-forming layers as SU, and when the number of uranium ore-forming layers is at least 1, su=1; su=0 when the number of uranium mineralized destination layers is 0;
Step 7.1.2: the time relation evaluation parameter of the uranium ore formation period and the first large-scale oil and gas overflow is C n (the n meaning is consistent with the n meaning in S n and the numerical value is consistent, and C n represents the time relation evaluation parameter of the uranium ore formation period of the uranium ore formation target layer with the number of S n and the first large-scale oil and gas overflow).
Compare U nMj of step 4.1 with T n of step 5.4:
when T n≥UnM1、UnM2、…、UnMj, then C n =0;
When T n＜UnM1、UnM2、…、UnMj, then C n =1;
When Tn＜UnM1、UnM2、…、UnMx,Tn≥UnMx+1、…、UnMj, then C n =1, where x is an integer, and 1< x < j;
and 7.1.3, assigning deposition phase and deposition phase type parameters:
Uranium-bearing target layer deposit phase parameter F n (where n has the meaning identical to n in S n and the values remain identical; F n represents deposit phase parameter number S n uranium-bearing target layer).
Deposition phase type P i, i=1, 2, 3, 4, 5.
Step 7.1.3.1, deposition phase type parameterization value:
when the sediment phase type is a plaited river or a plaited river delta, P 1 =1;
When the sediment phase type is a curvy river or a curvy river delta, P 2 =0.8;
When the deposition phase type is alluvial fan, P 3 =0.7;
when the deposition phase type is fandelta, P 4 =0.6;
when other types of phases are deposited, then P 5 =0;
step 7.1.3.2, counting various deposition phase areas by taking a group as a unit;
According to the sediment phase diagram compiled in the step six, various sediment phase areas A nPi (the meaning of n is consistent with that of n in S n and the numerical values are consistent, and A nPi represents various sediment phase area evaluation parameters of a layer of the uranium mineous mesh with the number of S n) are counted by taking groups as units.
Step 7.1.3.3: assignment of deposition phase parameters
Deposition phase parameters Fn＝∑Pi×(AnPi/A),(i＝1、2、3、4、5)＝P1×(AnP1/A)+P2×(AnP2/A)+P3×(AnP3/A)+P4×(AnP4/A)+P5×(AnP5A);
Step 7.1.4: assigning a value to a uranium ore formation period duration total parameter E n of a uranium ore formation target layer, wherein the meaning of n is consistent with that of n in S n, and the values are kept consistent; e n denotes a uranium mineralisation period duration sum parameter of the order uranium mineralisation numbered S n.
E n＝2×(∑Un M/20 when ΣU n M is not less than 20 Ma);
E n＝1.5×(∑Un M/10 when 10Ma is less than or equal to Sigma U n M < 20 Ma;
E n＝1×(∑Un M/6 when 6Ma is less than or equal to Sigma U n M < 10 Ma);
E n＝0.5×(∑Un M/3 when 3Ma is less than or equal to Sigma U n M is less than 6 Ma;
e n＝0.1×(∑Un M/1 when 1Ma is less than or equal to Sigma U n M < 3 Ma;
when 0Ma < Σu n M < 1Ma, then E n =0.05;
the step 7.2 of evaluating the mathematical model further comprises:
Step 7.2.1: calculating a sandstone type uranium deposit distant view evaluation mathematical model value in a strong oil gas reduction region of the basin rim of the sedimentary basin by taking the group as a unit; the layer uranium ore perspective evaluation mathematical model of each uranium mineralogy is MO n, wherein the meaning of n is consistent with that of n in S n, and the numerical values are kept consistent; MO n represents a mathematical model for perspective evaluation of uranium ore of uranium mineralisation destination, numbered S n.
MOn＝SU×En×Cn×Fn
Step 7.2.2: calculating a sandstone type uranium deposit distant view evaluation mathematical model value in a basin edge strong oil gas reduction region of a sedimentary basin: sandstone type uranium deposit distant view evaluation mathematical model of basin edge strong oil gas reduction region of sedimentary basin is MO
MO＝∑MOn＝MO1+MO2+MO3+…+MOn。
Step 7.3 evaluates sandstone-type uranium ore perspective of the strong oil-gas reduction region of the basin rim of the sedimentary basin, and further comprises:
When MO n is more than or equal to 0.5 and MO is more than or equal to 1, sandstone-type uranium deposit in the region of strong oil gas reduction at the basin rim of the sedimentary basin is large;
When MO is more than or equal to 0.5 and less than or equal to 1, the sandstone uranium deposit in the region of strong oil gas reduction at the basin rim of the sedimentary basin is medium in perspective;
when MO is more than or equal to 0.1 and less than 0.5, the prospect of sandstone-type uranium ores in the oil-gas reduction area with strong basin edges of the sedimentary basin is small;
When MO is more than or equal to 0 and less than 0.1, the sandstone type uranium deposit prospect in the area of strong oil gas reduction at the basin edge of the sedimentary basin is absent.
The beneficial technical effects of the invention are as follows:
the sandstone type uranium deposit perspective evaluation method for the high-oil-gas reduction region at the basin rim of the sedimentation basin, which is designed by the invention, integrates comprehensive stratum, non-integrated surface, oil-gas reduction, paleoxidation and sedimentation phase factors, can quantitatively evaluate the sandstone type uranium deposit perspective of the high-oil-gas reduction region at the basin rim of the sedimentation basin, and provides evaluation parameters for sandstone type uranium deposit investigation in the region.
Detailed Description
The present invention will be described in further detail with reference to examples.
The sandstone type uranium deposit perspective evaluation method for the region with strong oil gas reduction at the basin edge of the sedimentary basin comprises the following steps:
Step one: establishing a stratum table; collecting and analyzing regional geology and drilling comprehensive data of a strong oil-gas reduction region of a sedimentary basin, and establishing a stratum information table of the region from bottom to top in time sequence by taking groups as units; the stratum information table includes: the primary color of the stratum, the color of the sandstone, whether carbon scraps are contained or not, the relation of stratum contact, the burial depth of all drilling stratum bottom plates, the thickness of the sandstone and the sand content are contained; the sandstone color comprises: conglomerate color; the sandstone thickness comprises: conglomerate thickness; the sand content comprises: sand content of conglomerate, sand thickness/formation thickness.
Step two, a step two is carried out; screening uranium ore-forming layers; screening uranium ore-forming layers by taking groups as units according to the table established in the step one; the uranium mineralization mesh layer screening conditions include:
(1) The primary color of the stratum is grey;
(2) Carbon-rich cuttings or coal seam inclusion;
The number of uranium ore-forming target layers screened in the second step can be one or more, and the number of sequences in which n is the target layer number is represented by S n, and n=1, 2, 3 and ….
Step three: delineating a sandstone-type uranium mine distant view evaluation area; according to the borehole stratum bottom plate burial depth counted by taking the group as a unit in the first step, compiling a uranium ore formation target layer S n bottom plate burial depth contour map screened in the second step by taking the group as a unit, taking a burial depth line of 1500m of the stratum bottom plate burial depth, wherein the burial depth line of 1500m of the stratum bottom plate burial depth is L n, n is the sequence number of the burial depth line number, and n=1, 2, 3 and …; the maximum range defined by the aggregate of all L n is taken as the range of the distant view evaluation area of the sandstone-type uranium deposit, and the area A of the distant view evaluation area is calculated;
and (3) compiling the uranium ore formation target layer S n bottom plate burial depth contour map screened in the second step by taking the group as a unit, and endowing a projection coordinate system.
Step four: determining the ore forming period of sandstone uranium;
step 4.1: screening a layer sandstone type uranium ore formation period of uranium ore formation meshes; further comprises: screening the uranium-bearing stratum according to the stratum table established in the first step, wherein the unconformity surface between the uranium-bearing stratum and the large-scale overburden stratum overlaid on the uranium-bearing stratum is a sandstone uranium-bearing period U nMj (the meaning of n is consistent with that of n in S n, and the numerical values are kept consistent, j is the number of uranium-bearing periods of the uranium-bearing stratum with the number of S n, j=1, 2, 3 and …, U nMj corresponds to the jth uranium-bearing period of the uranium-bearing stratum with the number of Sn, and U 2M2 corresponds to the 2 nd uranium-bearing period of the uranium-bearing stratum with the number of S 2. Each uranium mineralisation mesh layer may have 1 to j sandstone uranium mineralisation periods.
Step 4.2: establishing a uranium mineralization schedule of a uranium mineralization target layer; comprising the following steps: establishing a uranium mineralization schedule of a uranium mineralization target layer, including: establishing a uranium ore formation period table of a uranium ore formation target layer according to the sandstone type uranium ore formation period screened in the step 4.1, wherein the table comprises: the uranium ore formation target layer, the non-integrated surface corresponding to the uranium ore formation period and the non-integrated surface duration corresponding to the uranium ore formation period are in the unit of Ma, and the sum of the uranium ore formation period durations of the uranium ore formation target layer is in the unit of Ma;
And the sum sigma U n M of the durations of the uranium mining periods of the uranium mining target layer is equal to the sum of durations of the non-integrated surfaces corresponding to all the uranium mining periods of the uranium mining target layer.
Step five: determining the time of first large-scale oil gas overflow in the range of a sandstone-type uranium ore perspective evaluation area;
Step 5.1: collecting oil sandstone samples in a uranium mineous layer according to a group unit in a range of a sandstone uranium ore perspective evaluation area defined in the third step, wherein the distances among the samples are uniformly distributed in the uranium ore perspective evaluation area; when the sample is collected, a wood tool is used for collecting the middle part of the rock core, and the sample is not weathered and is not polluted by metal; the weight of the sample is 200g, and the sample is stored by using a edge-pull sealing plastic bag;
Step 5.2: crushing the sample collected in the step 5.1 to 80-100 meshes by using an agate grinding tool, placing the crushed sample in a Soxhlet extractor, adding 97% of tribromomethane and 3% of methanol for soaking for more than 4 hours, finally separating solid from liquid by using filter paper, heating the liquid part until the tribromomethane volatilizes, and separating chloroform asphalt A.
Step 5.3: weighing 0.2g of chloroform asphalt A extracted in the step 5.2, and placing proper amounts of 185 Re and 190 Os diluent into a Carlos tube; inverse Wang Shuifa is used, namely: 116mol/L HNO 3 and 12mol/L HCl are continuously melted for 48 hours at 240 ℃; then separating and purifying Os by anion exchange method and micro-distillation method, and separating and purifying Re by anion exchange resin method or acetone extraction method; finally, measuring the abundance of each isotope of Re and Os by utilizing an isotope dilution anion thermal ionization mass spectrum (ID-NTIMS);
step 5.4: and 5.3, measuring the abundance data of each isotope of Re and Os of each uranium-bearing ore-forming layer, and calculating the calculated result to be the time T n of the first large-scale oil-gas overflow of the uranium-bearing ore-forming layer in the range of the sandstone-type uranium ore perspective evaluation area, wherein the unit is Ma.
Step six: compiling a layer deposition phase diagram of uranium mineralogy in a sandstone type uranium mine perspective evaluation area; further comprises:
Step 6.1: according to the drilling sandstone thickness and the sand content counted in the first step, compiling a sediment phase diagram of the uranium mineralization target layer S n screened in the second step by taking a group as a unit;
And the programming range of the sediment phase diagram of the uranium mineralization target layer S n screened in the second step is determined by the range of the sandstone-type uranium ore distant view evaluation area outlined in the third step.
Step seven: establishing a sandstone type uranium deposit distant view evaluation model in a basin edge strong oil gas reduction region of a sedimentary basin;
step 7.1: evaluating parameter assignment; further comprises:
Step 7.1.1: assigning values to uranium ore-forming layers, and setting the uranium ore-forming layers as SU, wherein su=1 when the number of uranium ore-forming layers is at least 1; su=0 when the number of uranium mineralized destination layers is 0;
Step 7.1.2: the time relation of the uranium ore-forming period and the first large-scale oil gas overflow is C n
Compare U nMj of step 4.1 with T n of step 5.4:
when T n≥UnM1、UnM2、…、UnMj, then C n =0;
When T n＜UnM1、UnM2、…、UnMj, then C n =1;
When Tn＜UnM1、UnM2、…、UnMx,Tn≥UnMx+1、…、UnMj, then C n =1, where x is an integer, and 1< x < j;
and 7.1.3, assigning deposition phase and deposition phase type parameters:
Uranium formation destination layer deposit phase parameter F n, deposit phase type P i, i=1, 2, 3, 4, 5
Step 7.1.3.1, deposition phase type parameterization value:
when the sediment phase type is a plaited river or a plaited river delta, P 1 =1;
When the sediment phase type is a curvy river or a curvy river delta, P 2 =0.8;
When the deposition phase type is alluvial fan, P 3 =0.7;
when the deposition phase type is fandelta, P 4 =0.6;
when other types of phases are deposited, then P 5 =0;
step 7.1.3.2, counting various deposition phase areas by taking a group as a unit;
counting various deposition phase areas A by taking groups as units according to the deposition phase diagram compiled in the step six nPi
Step 7.1.3.3: assignment of deposition phase parameters
Deposition phase parameters Fn＝∑Pi×(AnPi/A),(i＝1、2、3、4、5)＝P1×(AnP1/A)+P2×(AnP2/A)+P3×(AnP3/A)+P4×(AnP4/A)+P5×(AnP5A);
Step 7.1.4: assigning a value to the parameter E n of the sum of the uranium ore forming period duration of the uranium ore forming target layer
E n＝2×(∑Un M/20 when ΣU n M is not less than 20 Ma);
E n＝1.5×(∑Un M/10 when 10Ma is less than or equal to Sigma U n M < 20 Ma;
E n＝1×(∑Un M/6 when 6Ma is less than or equal to Sigma U n M < 10 Ma);
E n＝0.5×(∑Un M/3 when 3Ma is less than or equal to Sigma U n M is less than 6 Ma;
e n＝0.1×(∑Un M/1 when 1Ma is less than or equal to Sigma U n M < 3 Ma;
when 0Ma < Σu n M < 1Ma, then E n =0.05;
Step 7.2: establishing an evaluation mathematical model; further comprises:
Step 7.2.1: calculating a sandstone type uranium deposit distant view evaluation mathematical model value in a strong oil gas reduction region of the basin rim of the sedimentary basin by taking the group as a unit; the distant view evaluation mathematical model of the layer uranium ore of each uranium mineralogy is MO n;
MOn＝SU×En×Cn×Fn
Step 7.2.2: calculating a sandstone type uranium deposit distant view evaluation mathematical model value in a basin edge strong oil gas reduction region of a sedimentary basin: sandstone type uranium deposit distant view evaluation mathematical model of basin edge strong oil gas reduction region of sedimentary basin is MO
MO＝∑MOn＝MO1+MO2+MO3+…+MOn。
Step 7.3: evaluating sandstone uranium deposit perspective in a region where the basin rim of the sedimentary basin is strong in oil and gas reduction further comprises:
When MO n is more than or equal to 0.5 and MO is more than or equal to 1, sandstone-type uranium deposit in the region of strong oil gas reduction at the basin rim of the sedimentary basin is large;
When MO is more than or equal to 0.5 and less than or equal to 1, the sandstone uranium deposit in the region of strong oil gas reduction at the basin rim of the sedimentary basin is medium in perspective;
when MO is more than or equal to 0.1 and less than 0.5, the prospect of sandstone-type uranium ores in the oil-gas reduction area with strong basin edges of the sedimentary basin is small;
When MO is more than or equal to 0 and less than 0.1, the sandstone type uranium deposit prospect in the area of strong oil gas reduction at the basin edge of the sedimentary basin is absent.
While the embodiments of the present invention have been described in detail, the foregoing embodiments are merely preferred embodiments of the present invention, the present invention is not limited to the above embodiments, and various changes may be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (9)
1. The sandstone type uranium deposit perspective evaluation method for the areas with strong oil gas reduction at basin edges of sedimentary basins is characterized by comprising the following steps:
step one: establishing a stratum table; collecting and analyzing regional geology and drilling comprehensive data of a strong oil-gas reduction region of a sedimentary basin, and establishing a stratum information table of the region from bottom to top in time sequence by taking groups as units;
step two, a step two is carried out; screening uranium ore-forming layers; screening uranium ore-forming layers by taking groups as units according to the table established in the step one;
step three: delineating a sandstone-type uranium mine distant view evaluation area;
step four: determining the ore forming period of sandstone uranium;
Step 4.1: screening a layer sandstone type uranium ore formation period of uranium ore formation meshes;
Step 4.2: establishing a uranium mineralization schedule of a uranium mineralization target layer; the step 4.2 includes: establishing a uranium mineralization schedule of a uranium mineralization target layer, including: establishing a uranium ore formation period table of a uranium ore formation target layer according to the sandstone type uranium ore formation period screened in the step 4.1, wherein the table comprises: the uranium ore formation target layer, the non-integrated surface corresponding to the uranium ore formation period and the non-integrated surface duration corresponding to the uranium ore formation period are in the unit of Ma, and the sum of the uranium ore formation period durations of the uranium ore formation target layer is in the unit of Ma;
The sum sigma U n M of the durations of the uranium ore periods of the uranium ore formation target layer is equal to the sum of durations of non-integrated surfaces corresponding to all the uranium ore periods of the uranium ore formation target layer, namely: sigma U nM＝UnM1+UnM2+…+UnMj; wherein U nMj can have 1 to j sandstone uranium ore stages for each uranium ore layer;
step five: determining the time of first large-scale oil gas overflow in the range of a sandstone-type uranium ore perspective evaluation area;
Step six: compiling a layer deposition phase diagram of uranium mineralogy in a sandstone type uranium mine perspective evaluation area;
Step seven: establishing a sandstone type uranium deposit distant view evaluation model in a basin edge strong oil gas reduction region of a sedimentary basin;
step 7.1: evaluating parameter assignment;
step 7.2: establishing an evaluation mathematical model;
step 7.3: and evaluating the sandstone type uranium ore prospect in the region of strong oil gas reduction at the basin rim of the sedimentary basin.
2. The method for evaluating the prospect of sandstone uranium deposit in a strong hydrocarbon reduction region of a basin rim of a sedimentary basin according to claim 1, wherein the method comprises the following steps: the first step further comprises: the stratum information table includes: the primary color of the stratum, the color of the sandstone, whether carbon scraps are contained or not, the relation of stratum contact, the burial depth of all drilling stratum bottom plates, the thickness of the sandstone and the sand content are contained; the sandstone color comprises: conglomerate color; the sandstone thickness comprises: conglomerate thickness; the sand content comprises: sand content of conglomerate, sand thickness/formation thickness.
3. The method for evaluating the prospect of sandstone uranium deposit in a strong hydrocarbon reduction region of a basin rim of a sedimentary basin according to claim 2, wherein the method comprises the following steps of: and step two, uranium mineralization mesh layer screening conditions comprise:
(1) The primary color of the stratum is grey;
(2) Carbon-rich cuttings or coal seam inclusion;
The number of uranium ore-forming target layers screened in the second step can be one or more, and the number of sequences in which n is the target layer number is represented by S n, and n=1, 2, 3 and ….
4. The sedimentary basin rim strong oil and gas reduction region sandstone uranium deposit perspective evaluation method according to claim 3, wherein the method comprises the following steps of: the third step further comprises: according to the borehole stratum bottom plate burial depth counted by taking the group as a unit in the first step, compiling a uranium ore formation target layer S n bottom plate burial depth contour map screened in the second step by taking the group as a unit, taking a stratum bottom plate burial depth line with the burial depth of 1500m, and taking the stratum bottom plate burial depth line L n as a stratum bottom plate burial depth line of the S n target layer; the maximum range defined by the aggregate of all L n is taken as the range of the distant view evaluation area of the sandstone-type uranium deposit, and the area A of the distant view evaluation area is calculated;
and (3) compiling the uranium ore formation target layer S n bottom plate burial depth contour map screened in the second step by taking the group as a unit, and endowing a projection coordinate system.
5. The method for evaluating the prospect of sandstone uranium deposit in a strong hydrocarbon reduction region of a basin rim of a sedimentary basin according to claim 4, wherein the method comprises the following steps of: the step 4.1 further comprises: screening a sandstone type uranium ore formation period U nMj as an unconformity surface between a uranium ore formation layer and an overlying large-scale overburden layer according to the stratum table established in the first step; each uranium mineralisation mesh layer may have 1 to j sandstone uranium mineralisation periods.
6. The method for evaluating the prospect of sandstone uranium deposit in a region with strong hydrocarbon reduction at the basin rim of a sedimentary basin according to claim 5, wherein the method comprises the following steps: the fifth step comprises the following steps:
Step 5.1: collecting oil sandstone samples in a uranium mineous layer according to a group unit in a range of a sandstone uranium ore perspective evaluation area defined in the third step, wherein the distances among the samples are uniformly distributed in the uranium ore perspective evaluation area; when the sample is collected, a wood tool is used for collecting the middle part of the rock core, and the sample is not weathered and is not polluted by metal; the weight of the sample is 200g, and the sample is stored by using a edge-pull sealing plastic bag;
Step 5.2: crushing the sample collected in the step 5.1 to 80-100 meshes by using an agate grinding tool, placing the crushed sample in a Soxhlet extractor, adding 97% of tribromomethane and 3% of methanol for soaking for more than 4 hours, finally, carrying out solid-liquid separation by using filter paper, heating a liquid part until the tribromomethane volatilizes, and separating chloroform asphalt A;
Step 5.3: weighing 0.2g of chloroform asphalt A extracted in the step 5.2, and placing proper amounts of 185 Re and 190 Os diluent into a Carlos tube; inverse Wang Shuifa is used, namely: 116mol/L HNO 3 and 12mol/L HCl are continuously melted for 48 hours at 240 ℃; then separating and purifying Os by anion exchange method and micro-distillation method, and separating and purifying Re by anion exchange resin method or acetone extraction method; finally, measuring the abundance of each isotope of Re and Os by utilizing isotope dilution anion thermal ionization mass spectrometry;
Step 5.4: and 5.3, measuring the abundance data of each isotope of Re and Os of each uranium-bearing ore-forming layer, and calculating the calculated result to be the time of first large-scale oil and gas overflow and scattering of the uranium-bearing ore-forming layer in the range of the sandstone-type uranium ore perspective evaluation area.
7. The method for evaluating the prospect of sandstone uranium deposit in a strong hydrocarbon reduction region of a basin rim of a sedimentary basin according to claim 6, wherein the method comprises the following steps: the sixth step further comprises: step 6.1: according to the drilling sandstone thickness and the sand content counted in the first step, compiling a sediment phase diagram of the uranium mineralization target layer S n screened in the second step by taking a group as a unit;
And the programming range of the sediment phase diagram of the uranium mineralization target layer S n screened in the second step is determined by the range of the sandstone-type uranium ore distant view evaluation area outlined in the third step.
8. The method for evaluating the prospect of sandstone uranium deposit in a strong hydrocarbon reduction region of a basin rim of a sedimentary basin according to claim 7, wherein the method comprises the following steps: the step 7.1 of evaluating the parameter assignment further comprises the following steps:
Step 7.1.1: assigning values to uranium ore-forming layers, and setting the uranium ore-forming layers as SU, wherein su=1 when the number of uranium ore-forming layers is at least 1; su=0 when the number of uranium mineralized destination layers is 0;
step 7.1.2: the time relation between the uranium ore-forming period and the first large-scale oil and gas overflow and scattering comprises the following steps:
Compare U nMj of step 4.1 with T n of step 5.4:
when T n≥UnM1、UnM2、…、UnMj, then C n =0;
When T n＜UnM1、UnM2、…、UnMj, then C n =1;
When Tn＜UnM1、UnM2、…、UnMx,Tn≥UnMx+1、…、UnMj, then C n =1, where x is an integer, and 1< x < j;
T n is the first large-scale oil gas overflow and dispersion time of the uranium mineralization target layer with the number of S n, wherein the meaning of n is consistent with that of n in S n, the numerical values are kept consistent, and the unit is Ma;
N in C n has the same meaning as n in S n, and the values are kept the same; c n represents a time relation evaluation parameter of uranium ore formation period and first large-scale oil and gas overflow of a uranium ore formation target layer with the number of S n;
and 7.1.3, assigning deposition phase and deposition phase type parameters:
Uranium forming target layer deposition phase parameters F n, wherein the meaning of n is consistent with that of n in S n, and the values are kept consistent; f n represents a sedimentary phase parameter of the uranium ore formation target layer with the number of S n;
deposition phase type P i, i=1, 2, 3, 4, 5
Step 7.1.3.1, deposition phase type parameterization value:
when the sediment phase type is a plaited river or a plaited river delta, P 1 =1;
When the sediment phase type is a curvy river or a curvy river delta, P 2 =0.8;
When the deposition phase type is alluvial fan, P 3 =0.7;
when the deposition phase type is fandelta, P 4 =0.6;
when other types of phases are deposited, then P 5 =0;
Step 7.1.3.2, counting various deposition phase areas by taking a group as a unit; counting various deposition phase areas by taking groups as units according to the deposition phase diagram compiled in the step six;
step 7.1.3.3: assignment of deposition phase parameters
Deposition phase parameters Fn＝∑Pi×(AnPi/A)＝P1×(AnP1/A)+P2×(AnP2/A)+P3×(AnP3/A)+P4×(AnP4/A)+P5×(AnP5A);
Wherein i=1, 2, 3, 4, 5, a nPi represents various deposition phase area evaluation parameters of the uranium ore mesh layer with the number of S n, the meaning of n in a nPi is consistent with the meaning of n in S n, and the values are kept consistent;
Step 7.1.4: assigning a value to the sum parameter of the uranium mining period duration of the uranium mining target layer; the following formula is shown:
E n＝2×(∑Un M/20 when ΣU n M is not less than 20 Ma);
E n＝1.5×(∑Un M/10 when 10Ma is less than or equal to Sigma U n M < 20 Ma;
E n＝1×(∑Un M/6 when 6Ma is less than or equal to Sigma U n M < 10 Ma);
E n＝0.5×(∑Un M/3 when 3Ma is less than or equal to Sigma U n M is less than 6 Ma;
e n＝0.1×(∑Un M/1 when 1Ma is less than or equal to Sigma U n M < 3 Ma;
when 0Ma < Σu n M < 1Ma, then E n =0.05;
Wherein E n is the sum parameter of the uranium ore formation period duration of uranium ore formation order of number S n; the meaning of n in E n is consistent with the meaning of n in S n and the values remain consistent.
9. The method for evaluating the prospect of sandstone uranium deposit in a strong hydrocarbon reduction region of a basin rim of a sedimentary basin according to claim 8, wherein the method comprises the following steps: the step 7.2 of evaluating the mathematical model further comprises:
Step 7.2.1: calculating a sandstone type uranium deposit distant view evaluation mathematical model value in a strong oil gas reduction region of the basin rim of the sedimentary basin by taking the group as a unit;
MOn＝SU×En×Cn×Fn
MO n is a mathematical model for evaluating the perspective of uranium ore object with the number of S n, where the meaning of n is identical to that of n in S n, and the values are kept identical;
Step 7.2.2: calculating a sandstone type uranium deposit distant view evaluation mathematical model value in a basin edge strong oil gas reduction region of a sedimentary basin: sandstone type uranium deposit distant view evaluation mathematical model of basin edge strong oil gas reduction region of sedimentary basin is MO
Mo= Σmo n＝MO1+MO2+MO3+…+MOn, where n=1, 2, 3, …
Step 7.3 evaluates sandstone-type uranium ore perspective of the strong oil-gas reduction region of the basin rim of the sedimentary basin, and further comprises:
When MO n is more than or equal to 0.5 and MO is more than or equal to 1, sandstone-type uranium deposit in the region of strong oil gas reduction at the basin rim of the sedimentary basin is large;
When MO is more than or equal to 0.5 and less than or equal to 1, the sandstone uranium deposit in the region of strong oil gas reduction at the basin rim of the sedimentary basin is medium in perspective;
when MO is more than or equal to 0.1 and less than 0.5, the prospect of sandstone-type uranium ores in the oil-gas reduction area with strong basin edges of the sedimentary basin is small;
When MO is more than or equal to 0 and less than 0.1, the sandstone type uranium deposit prospect in the area of strong oil gas reduction at the basin edge of the sedimentary basin is absent.
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