CN112464456A - Sandstone-type uranium ore long-range evaluation method in strong oil-gas reduction area of sedimentary basin edge - Google Patents
Sandstone-type uranium ore long-range evaluation method in strong oil-gas reduction area of sedimentary basin edge Download PDFInfo
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- 229910052770 Uranium Inorganic materials 0.000 title claims abstract description 263
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 title claims abstract description 263
- 238000011156 evaluation Methods 0.000 title claims abstract description 75
- 230000033558 biomineral tissue development Effects 0.000 claims abstract description 142
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- 238000000034 method Methods 0.000 claims abstract description 24
- 238000012216 screening Methods 0.000 claims abstract description 14
- 230000007774 longterm Effects 0.000 claims abstract description 8
- 238000010586 diagram Methods 0.000 claims abstract description 7
- 238000013210 evaluation model Methods 0.000 claims abstract description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 19
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 claims description 18
- 238000013178 mathematical model Methods 0.000 claims description 18
- 239000004576 sand Substances 0.000 claims description 16
- DIKBFYAXUHHXCS-UHFFFAOYSA-N bromoform Chemical compound BrC(Br)Br DIKBFYAXUHHXCS-UHFFFAOYSA-N 0.000 claims description 12
- 238000005553 drilling Methods 0.000 claims description 12
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 9
- 239000010426 asphalt Substances 0.000 claims description 9
- 230000015572 biosynthetic process Effects 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 229950005228 bromoform Drugs 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 239000003245 coal Substances 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 230000001089 mineralizing effect Effects 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
- QZPSXPBJTPJTSZ-UHFFFAOYSA-N aqua regia Chemical compound Cl.O[N+]([O-])=O QZPSXPBJTPJTSZ-UHFFFAOYSA-N 0.000 claims description 3
- 238000009933 burial Methods 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 3
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- 238000004821 distillation Methods 0.000 claims description 3
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- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 229910017604 nitric acid Inorganic materials 0.000 claims description 3
- 238000010587 phase diagram Methods 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 238000000176 thermal ionisation mass spectrometry Methods 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 239000002023 wood Substances 0.000 claims description 3
- 239000003085 diluting agent Substances 0.000 claims description 2
- 229910052718 tin Inorganic materials 0.000 claims 2
- PXUQTDZNOHRWLI-OXUVVOBNSA-O malvidin 3-O-beta-D-glucoside Chemical compound COC1=C(O)C(OC)=CC(C=2C(=CC=3C(O)=CC(O)=CC=3[O+]=2)O[C@H]2[C@@H]([C@@H](O)[C@H](O)[C@@H](CO)O2)O)=C1 PXUQTDZNOHRWLI-OXUVVOBNSA-O 0.000 claims 1
- 239000007789 gas Substances 0.000 description 44
- 238000007254 oxidation reaction Methods 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 3
- 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
- 239000003795 chemical substances by application Substances 0.000 description 1
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- 238000001764 infiltration Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
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- 229910052760 oxygen Inorganic materials 0.000 description 1
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Abstract
The invention belongs to the technical field of uranium mine exploration, and particularly relates to a sandstone-type uranium mine long-range evaluation method in a strong oil-gas reduction area of a sedimentary basin edge, which comprises the following steps of establishing a stratum table; screening a layer of uranium with an ore mesh; step three, delineating the range of a sandstone-type uranium ore prospect evaluation area; step four, determining the ore forming period of sandstone-type uranium; determining the time for the first large-scale oil and gas overflow in the sandstone-type uranium ore prospect evaluation area range; step six, compiling a layer sedimentary facies diagram of uranium mineralization meshes in the sandstone-type uranium ore prospect long-term evaluation area; and step seven, establishing a sandstone-type uranium ore prospect long-range evaluation model in the strong oil-gas reduction area of the basin edge of the sedimentary basin. The method integrates stratum, unconformity surface, oil-gas reduction, paleoxidation and sedimentary facies factors, can quantitatively evaluate the sandstone-type uranium deposit prospect in the strong oil-gas reduction area of the basin edge of the sedimentary basin, and provides evaluation parameters for the sandstone-type uranium deposit exploration in the area.
Description
Technical Field
The invention belongs to the technical field of uranium ore exploration, and particularly relates to a sandstone-type uranium ore long-range evaluation method in a basin edge strong oil-gas reduction area of a basin.
Background
In the strong oil-gas reduction area of the sedimentary basin, oil gas is strongly exuded, the basin is represented as an exudation type basin, the infiltration of oxygen-containing uranium-containing fluid is inhibited, and the strong oil-gas reduction action is unfavorable for sandstone type uranium mineralization. The oxidation zone and uranium mineralization which are possibly formed in the early stage are covered by strong oil-gas action reduction, the uranium ore is difficult to be explored by finding an oxidation zone-oxidation reduction transition zone-reduction zone mode, and the prospect evaluation difficulty of sandstone-type uranium ore in the region is greatly increased. Therefore, in order to solve the problem, a sandstone-type uranium ore prediction method in a strong oil-gas reduction region of a sedimentary basin edge needs to be established to evaluate the uranium mineralization prospect in the region.
Disclosure of Invention
The invention aims to provide a sandstone-type uranium ore long-range evaluation method in a strong oil-gas reduction area of a sedimentary basin edge, and aims to solve the technical problems that in the strong oil-gas reduction area of the sedimentary basin, because oil-gas seepage is strong, uranium ores are difficult to survey by searching an oxidation zone-oxidation reduction transition zone-reduction zone mode, and long-range evaluation is difficult to perform on sandstone-type uranium ores in the area.
The technical scheme of the invention is as follows:
the sedimentary basin edge strong oil-gas reduction area sandstone-type uranium deposit prospect evaluation method comprises the following steps:
the method comprises the following steps: establishing a stratum table; collecting and analyzing regional geological and drilling comprehensive data of a strong oil-gas reduction area of a sedimentary basin, and establishing a stratum information table of the area from bottom to top in time sequence by taking a group as a unit;
step two; screening a layer of uranium into ore meshes; screening the uranium into ore layer by taking the group as a unit according to the table established in the step one;
step three: delineating the range of a sandstone-type uranium ore prospect evaluation area;
step four: determining a sandstone-type uranium mineralization period;
step 4.1: screening a sandstone type uranium mineralization period of a uranium mineralization target layer;
step 4.2: establishing a uranium mineralization period table of a uranium mineralization target layer;
step five: determining the time for the first large-scale oil gas overflow in the sandstone-type uranium ore prospect evaluation area range;
step six: compiling a layer sedimentary facies diagram of uranium mineralization orders in a sandstone-type uranium ore prospect long-term evaluation area;
step seven: establishing a sandstone-type uranium ore prospect long-range evaluation model in a strong oil-gas reduction area of a basin edge 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 strong oil-gas reduction area of the basin edge of the sedimentary basin.
The first step further comprises: the formation information table includes: the method comprises the following steps of (1) determining the original color of a stratum, the color of sandstone, whether carbon chips are contained or a coal seam is included, the contact relation of the stratum, the buried depth of the bottom plate of all drilling stratum, the thickness of the sandstone and the sand content; the sandstone color comprises: conglomerate color; the sandstone thickness comprises: the thickness of the conglomerate; the sand content comprises: conglomerate sand fraction, sandstone thickness/formation thickness sand fraction.
In the second step, the layer screening conditions of the uranium mineralization mesh comprise:
(1) the native color of the stratum is gray;
(2) carbon-rich cuttings or coal seams;
one or more layers of uranium mineralization target screened in the second step can be selected, and the layer of uranium mineralization target is SnWherein n is the number of sequences of the target layer number, and n is 1, 2, 3, …. N appearing hereinafter is all in accordance with the meaning of n here
The third step further comprises: compiling the uranium mineralization target layer S screened in the second step by taking the group as the unit according to the buried depth of the bottom plate of the drilling stratum counted by taking the group as the unit in the first stepnThe contour map of the buried depth of the floor takes a buried depth line with the buried depth of the floor 1500m by taking a group as a unit, and the buried depth line with the buried depth of the floor 1500m is LnWhere n has the meaning of SnThe meanings of the middle n are consistent, and the numerical values are kept consistent; l isnCorresponding number is SnDepth-of-bed of the target layer, e.g. L2Corresponding number is S2Burying a deep line in a stratum bottom plate of a target layer; all L are connectednThe maximum range defined by the collection is the range of a distant view evaluation area of the sandstone-type uranium ore, and the area A of the range of the distant view evaluation area is calculated;
and compiling the uranium mineralization target layer S screened in the second step by taking the group as a unitnThe floor burial depth contour map is given a projection coordinate system.
The step 4.1 further comprises: according to the step oneThe unconformity surface between the layer for screening the uranium into ore and the overlying large-scale overburden stratum is sandstone-type uranium ore-forming period UnMjWhere n has the meaning of SnThe meanings of the middle n are consistent, and the numerical values are kept consistent; j is numbered SnThe number of uranium mineralization periods of a uranium mineralization target layer is 1, 2, 3 and …; u shapenMjThe jth uranium mineralization phase of the layer of uranium mineralization numbered Sn, e.g. U2M2Corresponding number is S2The 2 nd uranium mineralization phase of a uranium mineralogy layer of (1) to (j) sandstone-type uranium mineralization phases per uranium mineralogy layer.
The step 4.2 comprises the following steps: establishing a uranium mineralization period table of a uranium mineralization target layer, comprising: establishing a uranium mineralization period table of a uranium mineralization target layer according to the sandstone type uranium mineralization period screened in the step 4.1, wherein the table comprises: duration time of a uranium mineralization target layer, an unconformity surface corresponding to a uranium mineralization period and an unconformity surface corresponding to the uranium mineralization period is given by the sum of Ma and duration time of the uranium mineralization period of the uranium mineralization target layer, and the unit is Ma;
the sum sigma U of duration time of uranium mineralization period of the uranium mineralization target layernM，
∑UnM＝UnM1+UnM2+.....+UnMjIs numbered as SnThe sum of durations of unconformities corresponding to all uranium mineralization periods of the uranium mineralization target layer.
The fifth step comprises the following steps:
step 5.1: collecting oil sandstone samples in a uranium ore mineralization layer by taking groups as units in the three circles of sandstone type uranium ore prospect evaluation area range, wherein the distances among the samples are uniformly distributed in the uranium ore prospect evaluation area; when a sample is collected, a wood tool is used for collecting the middle part of the 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 in a plastic bag sealed by a drawn edge;
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 4h, finally separating solid from liquid by using filter paper, heating the liquid part until the tribromomethane volatilizes, and separating out organic chloroform asphalt A.
Step 5.3: weighing 0.2g of chloroform asphalt A extracted in the step 5.2 and proper amount of chloroform asphalt A185Re and190placing the Os diluent in a Carlos tube; adopting a reverse aqua regia method, namely: 116mol/L HNO3And 12mol/L HCl at 240 ℃ for 48 hours; then separating and purifying Os by an anion exchange method and a micro-distillation method, and separating and purifying Re by an anion exchange resin method or an acetone extraction method; finally, measuring the abundance of each isotope of Re and Os by using isotope dilution anion thermal ionization mass spectrometry (ID-NTIMS);
step 5.4: calculating the abundance data of the Re and Os isotopes of each uranium mineralization target layer determined in the step 5.3, wherein the calculation result is the time T of the first large-scale oil-gas overflow of the uranium mineralization target layer in the sandstone-type uranium ore prospect evaluation area rangen(where n has the meaning of SnThe meanings of the middle n are consistent, and the numerical values are kept consistent; tn has the identification number SnThe first large-scale oil-gas spill-over time of the uranium mineralization target layer) in unit of Ma.
The sixth step further comprises: step 6.1: compiling the uranium mineralization target layer S screened in the second step by taking the group as a unit according to the thickness and sand content of the drilling sandstone counted in the first stepnA sedimentary phase diagram;
the uranium screened in the second step is formed into a target layer SnThe compilation range of the sedimentary facies diagram is based on the range of the sandstone-type uranium deposit prospect long-term evaluation area defined in the third step.
The step 7.1 of evaluating the parameter assignments further comprises:
step 7.1.1: assigning evaluation parameter values to the uranium mineralization target layer, setting the evaluation parameter of the uranium mineralization target layer as SU, and when the number of uranium mineralization target layers is at least 1, the SU is 1; when the number of uranium mineralization target layers is 0, SU is 0;
step 7.1.2: the time relation evaluation parameter of the uranium mineralization period and the first large-scale oil gas overflow is Cn(where n has the meaning of SnThe meanings of the middle n are consistent, and the numerical values are kept consistent; cnThe expression number is SnUranium mineralization period and first time of uranium mineralization target layerTime-related evaluation parameters for large-scale oil and gas spill).
Compare U of step 4.1nMjWith T of step 5.4n：
When T isn≥UnM1、UnM2、…、UnMjThen C isn＝0；
When T isn＜UnM1、UnM2、…、UnMjThen C isn＝1；
When T isn＜UnM1、UnM2、…、UnMx，Tn≥UnMx+1、…、UnMjThen C isn1, where x is an integer, and 1<x<j；
And 7.1.3, assigning parameters of the sedimentary facies and the sedimentary facies types:
layer dephase parameter F for uranium formationn(where n has the meaning of SnThe meanings of the middle n are consistent, and the numerical values are kept consistent; fnThe expression number is SnSedimentary phase parameters of a uranium mineralization target layer).
Sedimentary phase type Pi，i＝1、2、3、4、5。
Step 7.1.3.1, deposit phase type assignment parameter value:
when the sedimentary facies is braided river or braided river delta, P is1＝1；
When the sedimentary facies type is Qu Ruan, Qu Ruan Delta, then P2＝0.8；
When the type of the deposition phase is the alluviation fan, P is3＝0.7；
When the sedimentary facies type is delta, P is4＝0.6；
When other types of sedimentary phases are present, then P5＝0；
Step 7.1.3.2, counting the area of each type of sedimentary facies by taking a group as a unit;
according to the sedimentary facies map compiled in the sixth step, the area A of each type of sedimentary facies is counted by taking a group as a unitnPi(where n meansMeaning and SnThe meanings of the middle n are consistent, and the numerical values are kept consistent; a. thenPiThe expression number is SnEvaluation parameters for the area of each type of sedimentary phase of a layer of uranium mineralizing order).
Step 7.1.3.3: assigning depositional phase parameters
Sedimentary phase parameter 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: uranium mineralization target layer uranium mineralization period duration sum parameter EnAssignment of n meaning to S herenThe meanings of the middle n are consistent, and the numerical values are kept consistent; enThe expression number is SnThe duration sum parameter of the uranium mineralization period of the uranium mineralization order.
When sigma UnM is greater than or equal to 20Ma, then En＝2×(∑UnM/20)；
When 10Ma is less than or equal to sigma UnM < 20Ma, then En＝1.5×(∑UnM/10)；
When 6Ma is less than or equal to sigma UnM < 10Ma, then En＝1×(∑UnM/6)；
When 3Ma is less than or equal to sigma UnM < 6Ma, then En＝0.5×(∑UnM/3)；
When 1Ma is less than or equal to sigma UnM < 3Ma, then En＝0.1×(∑UnM/1)；
When 0Ma < SigmaUnM < 1Ma, then En＝0.05；
Said step 7.2 of evaluating the mathematical model further comprises:
step 7.2.1: calculating a sandstone type uranium deposit prospect evaluation mathematical model value in a strong oil-gas reduction area of a basin edge of the sedimentary basin by taking the group as a unit; the uranium ore prospect evaluation mathematical model of each uranium ore formation target layer is MOnWhere n has the meaning of SnThe meanings of the middle n are consistent, and the numerical values are kept consistent; MO (metal oxide semiconductor)nThe expression number is SnUranium ore of the order uranium mineralizationAnd (5) evaluating a mathematical model in a long-term view.
MOn＝SU×En×Cn×Fn
Step 7.2.2: calculating a sandstone type uranium ore prospect evaluation mathematical model value in a strong oil-gas reduction area of a basin edge of a sedimentary basin: the sedimentary basin margin strong oil-gas reduction area sandstone-type uranium ore long-range evaluation mathematical model is MO
MO＝∑MOn＝MO1+MO2+MO3+…+MOn。
Step 7.3 the strong oil gas reduction area sandstone type uranium deposit prospect of evaluation basin border still includes:
when MO is presentnMore than or equal to 0.5, and MO is more than or equal to 1, the sandstone-type uranium deposit prospect in the strong oil-gas reduction area of the basin edge of the sedimentary basin is large;
when MO is more than or equal to 0.5 and less than 1, the sandstone-type uranium ore prospect in the strong oil-gas reduction area of the basin edge of the sedimentary basin is medium;
when MO is more than or equal to 0.1 and less than 0.5, the sandstone-type uranium ore long shot in the strong oil-gas reduction area of the basin edge of the sedimentary basin is small;
when MO is more than or equal to 0 and less than 0.1, the sandstone-type uranium ore prospect in the strong oil-gas reduction area of the basin edge of the sedimentary basin is absent.
The invention has the beneficial technical effects that:
the sedimentary basin edge strong oil gas reduction area sandstone-type uranium deposit long-range view evaluation method provided by the invention integrates factors of comprehensive strata, unconformity, oil gas reduction, paleoxidation and sedimentary facies, can quantitatively evaluate the sandstone-type uranium deposit long-range view of the sedimentary basin edge strong oil gas reduction area sandstone-type uranium deposit, and provides evaluation parameters for the exploration of the sandstone-type uranium deposit in the area.
Detailed Description
The present invention will be described in further detail with reference to examples.
The sedimentary basin edge strong oil-gas reduction area sandstone-type uranium deposit prospect evaluation method comprises the following steps:
the method comprises the following steps: establishing a stratum table; collecting and analyzing regional geological and drilling comprehensive data of a strong oil-gas reduction area of a sedimentary basin, and establishing a stratum information table of the area from bottom to top in time sequence by taking a group as a unit; the formation information table includes: the method comprises the following steps of (1) determining the original color of a stratum, the color of sandstone, whether carbon chips are contained or a coal seam is included, the contact relation of the stratum, the buried depth of the bottom plate of all drilling stratum, the thickness of the sandstone and the sand content; the sandstone color comprises: conglomerate color; the sandstone thickness comprises: the thickness of the conglomerate; the sand content comprises: conglomerate sand fraction, sandstone thickness/formation thickness sand fraction.
Step two; screening a layer of uranium into ore meshes; screening the uranium into ore layer by taking the group as a unit according to the table established in the step one; the screening condition of the layer of the uranium mineralization mesh comprises the following steps:
(1) the native color of the stratum is gray;
(2) carbon-rich cuttings or coal seams;
one or more layers of uranium mineralization target screened in the second step can be selected, and the layer of uranium mineralization target is SnN is a sequence number of the target layer number, and n is 1, 2, 3, ….
Step three: delineating the range of a sandstone-type uranium ore prospect evaluation area; compiling the uranium mineralization target layer S screened in the second step by taking the group as the unit according to the buried depth of the bottom plate of the drilling stratum counted by taking the group as the unit in the first stepnThe contour map of the buried depth of the floor takes a buried depth line with the buried depth of the floor 1500m by taking a group as a unit, and the buried depth line with the buried depth of the floor 1500m is LnWherein n is the sequence number of the buried depth lines, and n is 1, 2, 3 and …; all L are connectednThe maximum range defined by the collection is the range of a distant view evaluation area of the sandstone-type uranium ore, and the area A of the range of the distant view evaluation area is calculated;
and compiling the uranium mineralization target layer S screened in the second step by taking the group as a unitnThe floor burial depth contour map is given a projection coordinate system.
Step four: determining a sandstone-type uranium mineralization period;
step 4.1: screening a sandstone type uranium mineralization period of a uranium mineralization target layer; further comprising: according to the stratum table established in the step one, the unconformity surface between the layer of the screened uranium mineralization mesh and the overlying large-scale overburden stratum is sandstone-type uranium mineralization period UnMjWherein (where n has the meaning of SnIn n has the same meaningAnd the numerical values are kept consistent; j is numbered SnThe number of uranium mineralization periods of a uranium mineralization target layer is 1, 2, 3 and …; u shapenMjThe jth uranium mineralization phase of the layer of uranium mineralization numbered Sn, e.g. U2M2Corresponding number is S2The 2 nd uranium mineralization stage of the layer of uranium mineralization). Each layer of uranium mineralizing mesh may have 1 to j sandstone-type uranium mineralizing stages.
Step 4.2: establishing a uranium mineralization period table of a uranium mineralization target layer; the method comprises the following steps: establishing a uranium mineralization period table of a uranium mineralization target layer, comprising: establishing a uranium mineralization period table of a uranium mineralization target layer according to the sandstone type uranium mineralization period screened in the step 4.1, wherein the table comprises: duration time of a uranium mineralization target layer, an unconformity surface corresponding to a uranium mineralization period and an unconformity surface corresponding to the uranium mineralization period is given by the sum of Ma and duration time of the uranium mineralization period of the uranium mineralization target layer, and the unit is Ma;
the sum sigma U of duration time of uranium mineralization period of the uranium mineralization target layernAnd M is equal to the sum of duration times of unconformities corresponding to all uranium mineralization periods of the uranium mineralization target layer.
Step five: determining the time for the first large-scale oil gas overflow in the sandstone-type uranium ore prospect evaluation area range;
step 5.1: collecting oil sandstone samples in a uranium ore mineralization layer by taking groups as units in the three circles of sandstone type uranium ore prospect evaluation area range, wherein the distances among the samples are uniformly distributed in the uranium ore prospect evaluation area; when a sample is collected, a wood tool is used for collecting the middle part of the 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 in a plastic bag sealed by a drawn edge;
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 4h, finally separating solid from liquid by using filter paper, heating the liquid part until the tribromomethane volatilizes, and separating the chloroform asphalt A.
Step 5.3: weighing 0.2g of chloroform asphalt A extracted in the step 5.2 and proper amount of chloroform asphalt A185Re and190os DiluteThe release agent is placed in a Carlos tube; adopting a reverse aqua regia method, namely: 116mol/L HNO3And 12mol/L HCl at 240 ℃ for 48 hours; then separating and purifying Os by an anion exchange method and a micro-distillation method, and separating and purifying Re by an anion exchange resin method or an acetone extraction method; finally, measuring the abundance of each isotope of Re and Os by using isotope dilution anion thermal ionization mass spectrometry (ID-NTIMS);
step 5.4: calculating the abundance data of the Re and Os isotopes of each uranium mineralization target layer determined in the step 5.3, wherein the calculation result is the time T of the first large-scale oil-gas overflow of the uranium mineralization target layer in the sandstone-type uranium ore prospect evaluation area rangenIn Ma.
Step six: compiling a layer sedimentary facies diagram of uranium mineralization orders in a sandstone-type uranium ore prospect long-term evaluation area; further comprising:
step 6.1: compiling the uranium mineralization target layer S screened in the second step by taking the group as a unit according to the thickness and sand content of the drilling sandstone counted in the first stepnA sedimentary phase diagram;
the uranium screened in the second step is formed into a target layer SnThe compilation range of the sedimentary facies diagram is based on the range of the sandstone-type uranium deposit prospect long-term evaluation area defined in the third step.
Step seven: establishing a sandstone-type uranium ore prospect long-range evaluation model in a strong oil-gas reduction area of a basin edge of a sedimentary basin;
step 7.1: evaluating parameter assignment; further comprising:
step 7.1.1: assigning values to the uranium mineralization mesh layer, setting the uranium mineralization mesh layer as SU, and when the number of the uranium mineralization mesh layers is at least 1, setting SU as 1; when the number of uranium mineralization target layers is 0, SU is 0;
step 7.1.2: the time relation between the uranium mineralization period and the first large-scale oil-gas overflow is Cn
Compare U of step 4.1nMjWith T of step 5.4n：
When T isn≥UnM1、UnM2、…、UnMjThen C isn＝0；
When T isn＜UnM1、UnM2、…、UnMjThen C isn＝1；
When T isn＜UnM1、UnM2、…、UnMx，Tn≥UnMx+1、…、UnMjThen C isn1, where x is an integer, and 1<x<j；
And 7.1.3, assigning parameters of the sedimentary facies and the sedimentary facies types:
layer dephase parameter F for uranium formationnOf the dephase type Pi，i＝1、2、3、4、5
Step 7.1.3.1, deposit phase type assignment parameter value:
when the sedimentary facies is braided river or braided river delta, P is1＝1；
When the sedimentary facies type is Qu Ruan, Qu Ruan Delta, then P2＝0.8；
When the type of the deposition phase is the alluviation fan, P is3＝0.7；
When the sedimentary facies type is delta, P is4＝0.6；
When other types of sedimentary phases are present, then P5＝0；
Step 7.1.3.2, counting the area of each type of sedimentary facies by taking a group as a unit;
according to the sedimentary facies map compiled in the sixth step, the area A of each type of sedimentary facies is counted by taking a group as a unitnPi
Step 7.1.3.3: assigning depositional phase parameters
Sedimentary phase parameter 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: giving uranium to the target layer of the uranium mineralization duration sum EnValue assignment of parameters
When sigmaUnM is greater than or equal to 20Ma, then En＝2×(∑UnM/20)；
When 10Ma is less than or equal to sigma UnM < 20Ma, then En＝1.5×(∑UnM/10)；
When 6Ma is less than or equal to sigma UnM < 10Ma, then En＝1×(∑UnM/6)；
When 3Ma is less than or equal to sigma UnM < 6Ma, then En＝0.5×(∑UnM/3)；
When 1Ma is less than or equal to sigma UnM < 3Ma, then En＝0.1×(∑UnM/1)；
When 0Ma < SigmaUnM < 1Ma, then En＝0.05；
Step 7.2: establishing an evaluation mathematical model; further comprising:
step 7.2.1: calculating a sandstone type uranium deposit prospect evaluation mathematical model value in a strong oil-gas reduction area of a basin edge of the sedimentary basin by taking the group as a unit; the uranium ore prospect evaluation mathematical model of each uranium ore formation target layer is MOn；
MOn＝SU×En×Cn×Fn
Step 7.2.2: calculating a sandstone type uranium ore prospect evaluation mathematical model value in a strong oil-gas reduction area of a basin edge of a sedimentary basin: the sedimentary basin margin strong oil-gas reduction area sandstone-type uranium ore long-range evaluation mathematical model is MO
MO＝∑MOn＝MO1+MO2+MO3+…+MOn。
Step 7.3: evaluating the sandstone-type uranium deposit prospect in the strong oil-gas reduction area of the basin edge of the sedimentary basin further comprises:
when MO is presentnMore than or equal to 0.5, and MO is more than or equal to 1, the sandstone-type uranium deposit prospect in the strong oil-gas reduction area of the basin edge of the sedimentary basin is large;
when MO is more than or equal to 0.5 and less than 1, the sandstone-type uranium ore prospect in the strong oil-gas reduction area of the basin edge of the sedimentary basin is medium;
when MO is more than or equal to 0.1 and less than 0.5, the sandstone-type uranium ore long shot in the strong oil-gas reduction area of the basin edge of the sedimentary basin is small;
when MO is more than or equal to 0 and less than 0.1, the sandstone-type uranium ore prospect in the strong oil-gas reduction area of the basin edge of the sedimentary basin is absent.
While the embodiments of the present invention have been described in detail, the above embodiments are merely preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (10)
1. The sedimentary basin edge strong oil-gas reduction area sandstone-type uranium deposit prospect evaluation method is characterized by comprising the following steps of:
the method comprises the following steps: establishing a stratum table; collecting and analyzing regional geological and drilling comprehensive data of a strong oil-gas reduction area of a sedimentary basin, and establishing a stratum information table of the area from bottom to top in time sequence by taking a group as a unit;
step two; screening a layer of uranium into ore meshes; screening the uranium into ore layer by taking the group as a unit according to the table established in the step one;
step three: delineating the range of a sandstone-type uranium ore prospect evaluation area;
step four: determining a sandstone-type uranium mineralization period;
step 4.1: screening a sandstone type uranium mineralization period of a uranium mineralization target layer;
step 4.2: establishing a uranium mineralization period table of a uranium mineralization target layer;
step five: determining the time for the first large-scale oil gas overflow in the sandstone-type uranium ore prospect evaluation area range;
step six: compiling a layer sedimentary facies diagram of uranium mineralization orders in a sandstone-type uranium ore prospect long-term evaluation area;
step seven: establishing a sandstone-type uranium ore prospect long-range evaluation model in a strong oil-gas reduction area of a basin edge 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 strong oil-gas reduction area of the basin edge of the sedimentary basin.
2. The sedimentary basin border strong oil-gas reduction region sandstone-type uranium deposit prospect evaluation method according to claim 1, characterized in that: the first step further comprises: the formation information table includes: the method comprises the following steps of (1) determining the original color of a stratum, the color of sandstone, whether carbon chips are contained or a coal seam is included, the contact relation of the stratum, the buried depth of the bottom plate of all drilling stratum, the thickness of the sandstone and the sand content; the sandstone color comprises: conglomerate color; the sandstone thickness comprises: the thickness of the conglomerate; the sand content comprises: conglomerate sand fraction, sandstone thickness/formation thickness sand fraction.
3. The sedimentary basin border strong oil-gas reduction region sandstone-type uranium deposit prospect evaluation method according to claim 2, characterized in that: in the second step, the layer screening conditions of the uranium mineralization mesh comprise:
(1) the native color of the stratum is gray;
(2) carbon-rich cuttings or coal seams;
one or more layers of uranium mineralization target screened in the second step can be selected, and the layer of uranium mineralization target is SnN is a sequence number of the target layer number, and n is 1, 2, 3, ….
4. The sedimentary basin border strong oil-gas reduction region sandstone-type uranium deposit prospect evaluation method according to claim 3, characterized in that: the third step further comprises: compiling the uranium mineralization target layer S screened in the second step by taking the group as the unit according to the buried depth of the bottom plate of the drilling stratum counted by taking the group as the unit in the first stepnThe contour map of the buried depth of the bottom plate is a buried depth line L with the buried depth of the bottom plate of the stratum being 1500m by taking a group as a unitnIs SnBurying a deep line in a stratum bottom plate of a target layer; all L are connectednThe maximum range defined by the collection is the range of a distant view evaluation area of the sandstone-type uranium ore, and the area A of the range of the distant view evaluation area is calculated;
and compiling the uranium mineralization target layer S screened in the second step by taking the group as a unitnThe floor burial depth contour map is given a projection coordinate system.
5. Strong oil and gas reduction area sand of sedimentary basin edge according to claim 4The rock-type uranium ore prospect long-range evaluation method is characterized by comprising the following steps: the step 4.1 further comprises: according to the stratum table established in the step one, the unconformity surface between the layer of the screened uranium mineralization mesh and the overlying large-scale overburden stratum is sandstone-type uranium mineralization period UnMj(ii) a Each layer of uranium mineralizing mesh may have 1 to j sandstone-type uranium mineralizing stages.
6. The sedimentary basin border strong oil-gas reduction region sandstone-type uranium deposit prospect evaluation method according to claim 5, characterized in that: the step 4.2 comprises the following steps: establishing a uranium mineralization period table of a uranium mineralization target layer, comprising: establishing a uranium mineralization period table of a uranium mineralization target layer according to the sandstone type uranium mineralization period screened in the step 4.1, wherein the table comprises: duration time of a uranium mineralization target layer, an unconformity surface corresponding to a uranium mineralization period and an unconformity surface corresponding to the uranium mineralization period is given by the sum of Ma and duration time of the uranium mineralization period of the uranium mineralization target layer, and the unit is Ma;
duration sum Sigma U of uranium mineralization period of uranium mineralization target layernM is equal to the sum of duration times of unconformities corresponding to all uranium mineralization periods of a uranium mineralization target layer, namely: sigma UnM＝UnM1+UnM2+.....+UnMj(ii) a Wherein, UnMjThere may be 1 to j sandstone-type uranium mineralization stages for each layer of uranium mineralization mesh.
7. The sedimentary basin border strong oil-gas reduction region sandstone-type uranium deposit prospect evaluation method according to claim 6, characterized in that: the fifth step comprises the following steps:
step 5.1: collecting oil sandstone samples in a uranium ore mineralization layer by taking groups as units in the three circles of sandstone type uranium ore prospect evaluation area range, wherein the distances among the samples are uniformly distributed in the uranium ore prospect evaluation area; when a sample is collected, a wood tool is used for collecting the middle part of the 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 in a plastic bag sealed by a drawn edge;
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 4h, finally separating solid from liquid by using filter paper, heating the liquid part until the tribromomethane volatilizes, and separating the chloroform asphalt A.
Step 5.3: weighing 0.2g of chloroform asphalt A extracted in the step 5.2 and proper amount of chloroform asphalt A185Re and190placing the Os diluent in a Carlos tube; adopting a reverse aqua regia method, namely: 116mol/L HNO3And 12mol/L HCl at 240 ℃ for 48 hours; then separating and purifying Os by an anion exchange method and a micro-distillation method, and separating and purifying Re by an anion exchange resin method or an acetone extraction method; finally, measuring the abundance of each isotope of Re and Os by using isotope dilution anion thermal ionization mass spectrometry;
step 5.4: calculating the abundance data of each isotope of Re and Os of each uranium mineralization target layer determined in the step 5.3, wherein the calculation result is the time for the first large-scale oil-gas overflow of the uranium mineralization target layer in the sandstone-type uranium ore prospect evaluation area range; .
8. The sedimentary basin border strong oil-gas reduction region sandstone-type uranium deposit prospect evaluation method according to claim 7, characterized in that: the sixth step further comprises: step 6.1: compiling the uranium mineralization target layer S screened in the second step by taking the group as a unit according to the thickness and sand content of the drilling sandstone counted in the first stepnA sedimentary phase diagram;
the uranium screened in the second step is formed into a target layer SnThe compilation range of the sedimentary facies diagram is based on the range of the sandstone-type uranium deposit prospect long-term evaluation area defined in the third step.
9. The sedimentary basin border strong oil-gas reduction region sandstone-type uranium deposit prospect evaluation method according to claim 8, characterized in that: the step 7.1 of evaluating the parameter assignments further comprises:
step 7.1.1: assigning values to the uranium mineralization mesh layer, setting the uranium mineralization mesh layer as SU, and when the number of the uranium mineralization mesh layers is at least 1, setting SU as 1; when the number of uranium mineralization target layers is 0, SU is 0;
step 7.1.2: the time relation between the uranium mineralization period and the first large-scale oil and gas overflow comprises the following steps:
compare U of step 4.1nMjWith T of step 5.4n：
When T isn≥UnM1、UnM2、…、UnMjThen C isn＝0；
When T isn＜UnM1、UnM2、…、UnMjThen C isn＝1；
When T isn＜UnM1、UnM2、…、UnMx，Tn≥UnMx+1、…、UnMjThen C isn1, where x is an integer, and 1<x<j；
TnIs numbered as SnThe first large-scale oil-gas spill time of the uranium mineralization target layer, wherein n means SnWherein n has the same meaning and the same numerical value, and the unit is Ma;
Cnmeaning of in n and SnThe meanings of the middle n are consistent, and the numerical values are kept consistent; cnThe expression number is SnEvaluating parameters of time relation between the uranium mineralization period of the uranium mineralization target layer and the first large-scale oil gas spill;
and 7.1.3, assigning parameters of the sedimentary facies and the sedimentary facies types:
layer dephase parameter F for uranium formationnWhere n has the meaning of SnThe meanings of the middle n are consistent, and the numerical values are kept consistent; fnThe expression number is SnSedimentary phase parameters of a uranium mineralization target layer).
Sedimentary phase type Pi，i＝1、2、3、4、5
Step 7.1.3.1, deposit phase type assignment parameter value:
when the sedimentary facies is braided river or braided river delta, P is1＝1；
When the sedimentary facies type is Qu Ruan, Qu Ruan Delta, then P2＝0.8；
When the type of the deposition phase is the alluviation fan, P is3＝0.7；
When the sedimentary facies type is delta, P is4＝0.6；
When other types of sedimentary phases are present, then P5＝0；
Step 7.1.3.2, counting the area of each type of sedimentary facies by taking a group as a unit; counting the area of each type of sedimentary facies by taking a group as a unit according to the sedimentary facies map compiled in the step six;
step 7.1.3.3: assigning depositional phase parameters
Sedimentary phase parameter Fn＝∑Pi×(AnPi/A)，(i＝1、2、3、4、5)＝P1×(AnP1/A)+P2×(AnP2/A)+P3×(AnP3/A)+P4×(AnP4/A)+P5×(AnP5A)；
Wherein A isnPiThe expression number is SnEvaluation parameters for the area of the various deposit phases of the layer of uranium mineralizing order, AnPiIn which n has the meaning of SnWherein n has the same meaning and the numerical values are kept the same;
step 7.1.4: assigning a value to a total parameter of the duration time of the uranium mineralization period of the uranium mineralization target layer; as shown in the following formula:
when sigma UnM is greater than or equal to 20Ma, then En＝2×(∑UnM/20)；
When 10Ma is less than or equal to sigma UnM < 20Ma, then En＝1.5×(∑UnM/10)；
When 6Ma is less than or equal to sigma UnM < 10Ma, then En＝1×(∑UnM/6)；
When 3Ma is less than or equal to sigma UnM < 6Ma, then En＝0.5×(∑UnM/3)；
When 1Ma is less than or equal to sigma UnM < 3Ma, then En＝0.1×(∑UnM/1)；
When 0Ma < SigmaUnM < 1Ma, then En＝0.05；
Wherein EnIs numbered SnThe duration sum parameter of the uranium mineralization period of the uranium mineralization order; enIn which n has the meaning of SnWherein n containsThe values are defined as consistent and the values remain consistent.
10. The sedimentary basin border strong oil-gas reduction region sandstone-type uranium deposit prospect evaluation method according to claim 8, characterized in that: said step 7.2 of evaluating the mathematical model further comprises:
step 7.2.1: calculating a sandstone type uranium deposit prospect evaluation mathematical model value in a strong oil-gas reduction area of a basin edge of the sedimentary basin by taking the group as a unit;
MOn＝SU×En×Cn×Fn
wherein MO isnIs numbered SnThe uranium ore prospect evaluation mathematical model of uranium ore of uranium mineralization purposes, wherein the meaning of n and SnThe meanings of the middle n are consistent, and the numerical values are kept consistent;
step 7.2.2: calculating a sandstone type uranium ore prospect evaluation mathematical model value in a strong oil-gas reduction area of a basin edge of a sedimentary basin: the sedimentary basin margin strong oil-gas reduction area sandstone-type uranium ore long-range evaluation mathematical model is MO
MO＝∑MOn＝MO1+MO2+MO3+…+MOnWherein n is 1, 2, 3, …
Step 7.3 the strong oil gas reduction area sandstone type uranium deposit prospect of evaluation basin border still includes:
when MO is presentnMore than or equal to 0.5, and MO is more than or equal to 1, the sandstone-type uranium deposit prospect in the strong oil-gas reduction area of the basin edge of the sedimentary basin is large;
when MO is more than or equal to 0.5 and less than 1, the sandstone-type uranium ore prospect in the strong oil-gas reduction area of the basin edge of the sedimentary basin is medium;
when MO is more than or equal to 0.1 and less than 0.5, the sandstone-type uranium ore long shot in the strong oil-gas reduction area of the basin edge of the sedimentary basin is small;
when MO is more than or equal to 0 and less than 0.1, the sandstone-type uranium ore prospect in the strong oil-gas reduction area of the basin edge of the sedimentary basin is absent.
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