CN106257310A - Sedimentary basin oil gas strong reducing action district Prospecting Sandstone-type Uranium Deposits method for establishing model - Google Patents
Sedimentary basin oil gas strong reducing action district Prospecting Sandstone-type Uranium Deposits method for establishing model Download PDFInfo
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Abstract
The invention belongs to uranium exploration technical field, geologic process and the geologic elements such as the most comprehensive gas reduction effect, interlayer oxidation, plane of unconformity, fracture, sand body are provided, disclose each geologic process and between relation, determine the method for building up of the sedimentary basin strong gas reduction active region Prospecting Sandstone-type Uranium Deposits model looking for ore deposit target for sedimentary basin strong gas reduction active region；Comprise the following steps: step one, determine destination layer；Step 2, draws a circle to approve gas reduction effect distribution；Step 3, determines the plane of unconformity time；Step 4, determines gas reduction T action timeh；Step 5, determines uranium mineralizations；Step 6, sets up ore-search models.
Description
Technical field
The invention belongs to uranium exploration technical field, be specifically related to a kind of sedimentary basin oil gas strong reducing action district Prospecting Sandstone-type Uranium Deposits method for establishing model.
Background technology
The sandstone color that shows as of the gas reduction effect that sedimentary basin strong gas reduction active region is strong is grey black, filling petroleum substance in sandstone, can smell significantly " oil taste ", and geochemical conditions is reducing condition, Fe3+/Fe2+ < 1.In sedimentary basin, the most important indicator for deposit of sandstone-type uranium mineralization with respect is interlayer oxidized zone (sandstone is yellow, and geochemical conditions shows as oxidizing condition, Fe3+/Fe2+ > 1), and interlayer oxidized zone scale is the biggest, and sandstone type uranium mineralization scale is the biggest.And after strong gas reduction effect, interlayer oxidized zone yellow sandstone is changed into grey black, geochemical conditions is changed into reducing condition from oxidizing condition, cause None-identified interlayer oxidized zone, so that relying on the mode failures even finding that interlayer oxidized zone looks for sandstone-type uranium mineralization with respect, cannot effectively determine and look for ore deposit target, substantially increasing Ore-finding difficulty, therefore the foundation of sedimentary basin strong gas reduction active region Prospecting Sandstone-type Uranium Deposits model is the most necessary.
Summary of the invention
The technical problem to be solved is, not enough for prior art, geologic process and the geologic elements such as the most comprehensive gas reduction effect, interlayer oxidation, plane of unconformity, fracture, sand body are provided, disclose each geologic process and between relation, determine the method for building up of the sedimentary basin strong gas reduction active region Prospecting Sandstone-type Uranium Deposits model looking for ore deposit target for sedimentary basin strong gas reduction active region.
The technical solution adopted in the present invention is:
A kind of sedimentary basin oil gas strong reducing action district Prospecting Sandstone-type Uranium Deposits method for establishing model, comprises the steps:
Step one, determines destination layer；
Investigation outcrop, drill core, color is in Lycoperdon polymorphum Vitt, sandstone to be destination layer containing the stratum of carbon dust；
Survey area geologic information, in data the color of record be Lycoperdon polymorphum Vitt, stratum containing carbon dust be destination layer；
Choosing Lycoperdon polymorphum Vitt containing the sandstone of carbon dust, gravel rock stratum as strong gas reduction active region Prospecting Sandstone-type Uranium Deposits destination layer, destination layer can be 1 to several；
Step 2, draws a circle to approve gas reduction effect distribution；
Investigation has appearing of gas reduction, records its layer of position and coordinate；
Investigation drilling data, record has layer position and the drilling well coordinate of gas reduction；
The oil-gas pool distribution figure of the departments such as investigation oil；
Above-mentioned outcrop, drilling well, oil-gas pool distribution figure are projected on appropriate scale geologic map, draws a circle to approve gas reduction effect distribution by layer position；
Step 3, determines the plane of unconformity time；
According to regional stratum, structure data, determining the plane of unconformity on destination layer position and time thereof, plane of unconformity can have 1 to arrive several, the corresponding time T of each plane of unconformityu, it is followed successively by T according to from Gu to new orderu1、Tu2、Tu3……。
Step 4, determines gas reduction T action timeh；
Step 5, determines uranium mineralizations；
Step 6, sets up ore-search models；
Determine that gas reduction uses three kinds of method of testings, complexity based on geologic process action time, select suitable method to determine gas reduction T action time in destination layer in three kinds of method of testings according to practical situationh；
Method one, fluid inclusion stratum thermal history method:
Gather green oil sandstone core sample to cut into slices, be cut into the inclusion enclave sheet that thickness is about 0.5mm；At fluorescence microscopy lens-belowed identifying hydrocarbon fluids inclusion enclave, hydrocarbon fluids inclusion enclave is distributed in group variety shape in carbonate cements, linearly distributed in quartz crack, be distributed in group variety shape in quartz secondary limit, hydrocarbon fluids inclusion enclave under fluorescence microscope in blue, yellow；Cold and hot of Linkam THMSG600 is utilized to measure hydrocarbon fluids inclusion enclave temperature；Measure hydrocarbon fluids inclusion enclave temperature throw in the thermal history evolution diagram of stratum, according to temperature corresponding with the layer position of sample collecting go out oil gas reduction time Th；
Method two, authigenic illite K-Ar isotope tracling method method:
Gather fresh drill core oil sands sample, example weight at least 1 kilogram, select authigenic illite mineral purity > the authigenic illite mineral of 95%, the authigenic illite picked out is carried out K-Ar isotopic dating, this age is the time T that gas reduction effect occursh；
Method three, carbonate cements Sm Nd isotope tracling method method:
Middle collection of appearing in the wild forms calcite cementation sample of sandstone, at least 1 kilogram of sample with gas reduction effect the same period；
Described the type calcite cementation sandstone features is:
1. it is distributed in lumps in the sandstone of gas reduction effect；
The most visible grey black oil, can smell " oil taste "；
Selecting carbonate cements 0.5 gram, the carbonate cements picked out is carried out Sm-Nd isotopic dating, this age is the time T that gas reduction effect occursh。
Described step 5, determines in uranium mineralizations, needs to determine " ancient uranium mineralization ", " modern uranium mineralization " type, " non-oil gas reduction mineralising " type, " earth's surface Colophonium absorbent-type uranium mineralization " type, specifically determines that method is as follows:
(1) " ancient uranium mineralization ", the method for " modern uranium mineralization " type are determined；
The interlayer oxidized zone formed before gas reduction effect is defined as " ancient interlayer oxidized zone ", and the uranium mineralization of formation is defined as " ancient uranium mineralization "；
The interlayer oxidized zone formed after gas reduction effect is defined as " modern interlayer oxidized zone ", and the uranium mineralization of formation is defined as " modern uranium mineralization "；
(1)Th<TuGas reduction is later than the plane of unconformity time action time
" ancient uranium mineralization " is one of uranium mineralizations；
(2)Th≥TuGas reduction time effect early than or equal to the plane of unconformity time
" modern uranium mineralization " is one of uranium mineralizations, there is not " ancient uranium mineralization "；
(3) there is multiple Tu, from Gu to being newly followed successively by Tu1、Tu2、Tu3Deng
Th<Tu1And Th≥Tu2(or Tu3Deng), then " ancient uranium mineralization " is one of uranium mineralizations, and " modern mineralising " is one of uranium mineralizations；
(2) method determining " non-oil gas reduction mineralising " type:
In sedimentary basin strong gas reduction active region, there is regional area is not affected by gas reduction effect.Gas reduction effect distribution figure according to step 2 establishment, do not suffering the Regional survey outcrop of oil-gas reactivation, borehole data, find the primary gray layer not suffering gas reduction effect, this primary gray layer can grow interlayer oxidized zone during plane of unconformity is grown, it is possible to forms sandstone-type uranium mineralization with respect.Such interlayer oxidized zone is defined as " non-oil gas reduction interlayer oxidized zone ", and the type uranium mineralization is defined as " non-oil gas reduction uranium mineralization "；
(3) method determining " earth's surface Colophonium absorbent-type uranium mineralization " type:
Behind oil gas crop out formed asphalitine, asphalitine can adsorption uranium element, make uranium element be enriched with in the sandstone of asphalitine and form uranium mineralization, such uranium mineralization small scale, such uranium mineralization is defined as " earth's surface Colophonium absorbent-type uranium mineralization ".
Described step 6 is set up in ore-search models, the uranium mineralizations determined according to step 5, sets up sedimentary basin strong gas reduction district Prospecting Sandstone-type Uranium Deposits model, and draws ore-search models with CorelDRAW, determines and look for ore deposit target, and ore-search models method for building up is as follows:
(6.1) each uranium mineralizations is plotted in ore-search models by the most suitable of destination layer position, place.
(6.2) " ancient interlayer oxidized zone " and " ancient uranium mineralization " is closer to basin ventral direction, and " modern interlayer oxidized zone " and " modern uranium mineralization " is closer to basin edge direction.
(6.3) " modern interlayer oxidized zone " preferential sandstone of " ancient interlayer oxidized zone " the most in early days, gravel rock stratum are grown.
Primary gray layer described in described step one shows as color gray, grey black, celadon, rich breeze, vegetal debris, presss from both sides coal seam, Fe2+/Fe3+>1。
In described step 2, selected map is advisable with 1:20 ten thousand to 1:5 ten thousand scale geologic map.
In described step 3, plane of unconformity refers to the large-scaled unconformity strata face of domain type, can have multiple plane of unconformity, each plane of unconformity corresponding time.
In step 4, three kinds of method of testing selection principle measuring the plane of unconformity times is based on the data degree of actual grasp, sample collecting quality, mineral select quality selection；
If fluid inclusion sheet can identifying hydrocarbon fluids inclusion enclave and hydrocarbon fluids inclusion enclave temperature can being measured, there is stratum thermal history evolution data can use " hydrocarbon fluids inclusion enclave stratum thermal history method "；
If oil sands sample can be picked out authigenic illite (purity > 95%) " authigenic illite K-Ar isotope tracling method method " can be used；
If able to find and the calcite cementation sandstone of the gas reduction effect formation same period, and collect enough samples, pick out carbonate cements, carbonate cements Sm Nd isotope tracling method method can be used.
The invention has the beneficial effects as follows:
1. the ore-search models constructed by the present invention has clearly indicated sedimentary basin strong gas reduction zone of action Prospecting Sandstone-type Uranium Deposits target；
2. disclose U metallogeny and strong gas reduction and act on time, mutual relation spatially and the uranium ore regularity of distribution, drastically increase sedimentary basin strong gas reduction active region Prospecting Sandstone-type Uranium Deposits efficiency；
3. substantially increase the work efficiency of Prospecting Sandstone-type Uranium Deposits.
Accompanying drawing explanation
Fig. 1 is sedimentary basin strong gas reduction active region Prospecting Sandstone-type Uranium Deposits method for establishing model flow chart；
Detailed description of the invention
The one provided the present invention with embodiment below in conjunction with the accompanying drawings is introduced:
A kind of sedimentary basin oil gas strong reducing action district Prospecting Sandstone-type Uranium Deposits method for establishing model, comprises the steps:
Step one, determines destination layer；
Investigation outcrop, drill core, color is in Lycoperdon polymorphum Vitt, sandstone to be destination layer containing the stratum of carbon dust；
Survey area geologic information, in data the color of record be Lycoperdon polymorphum Vitt, stratum containing carbon dust be destination layer；
Choosing Lycoperdon polymorphum Vitt containing the sandstone of carbon dust, gravel rock stratum as strong gas reduction active region Prospecting Sandstone-type Uranium Deposits destination layer, destination layer can be 1 to several；
Step 2, draws a circle to approve gas reduction effect distribution；
Investigation has appearing of gas reduction, records its layer of position and coordinate；
Investigation drilling data, record has layer position and the drilling well coordinate of gas reduction；
The oil-gas pool distribution figure of the departments such as investigation oil；
Above-mentioned outcrop, drilling well, oil-gas pool distribution figure are projected on appropriate scale geologic map, draws a circle to approve gas reduction effect distribution by layer position；
Step 3, determines the plane of unconformity time；
According to regional stratum, structure data, determining the plane of unconformity on destination layer position and time thereof, plane of unconformity can have 1 to arrive several, the corresponding time T of each plane of unconformityu, it is followed successively by T according to from Gu to new orderu1、Tu2、Tu3……。
Step 4, determines gas reduction T action timeh；
Step 5, determines uranium mineralizations；
Step 6, sets up ore-search models；
Determine that gas reduction uses three kinds of method of testings, complexity based on geologic process action time, select suitable method to determine gas reduction T action time in destination layer in three kinds of method of testings according to practical situationh；
Method one, fluid inclusion stratum thermal history method:
Gather green oil sandstone core sample to cut into slices, be cut into the inclusion enclave sheet that thickness is about 0.5mm；At fluorescence microscopy lens-belowed identifying hydrocarbon fluids inclusion enclave, hydrocarbon fluids inclusion enclave is distributed in group variety shape in carbonate cements, linearly distributed in quartz crack, be distributed in group variety shape in quartz secondary limit, hydrocarbon fluids inclusion enclave under fluorescence microscope in blue, yellow；Cold and hot of Linkam THMSG600 is utilized to measure hydrocarbon fluids inclusion enclave temperature；Measure hydrocarbon fluids inclusion enclave temperature throw in the thermal history evolution diagram of stratum, according to temperature corresponding with the layer position of sample collecting go out oil gas reduction time Th；
Method two, authigenic illite K-Ar isotope tracling method method:
Gather fresh drill core oil sands sample, example weight at least 1 kilogram, select authigenic illite mineral purity > the authigenic illite mineral of 95%, the authigenic illite picked out is carried out K-Ar isotopic dating, this age is the time T that gas reduction effect occursh；
Method three, carbonate cements Sm Nd isotope tracling method method:
Middle collection of appearing in the wild forms calcite cementation sample of sandstone, at least 1 kilogram of sample with gas reduction effect the same period；
Described the type calcite cementation sandstone features is:
1. it is distributed in lumps in the sandstone of gas reduction effect；
The most visible grey black oil, can smell " oil taste "；
Selecting carbonate cements 0.5 gram, the carbonate cements picked out is carried out Sm-Nd isotopic dating, this age is the time T that gas reduction effect occursh。
Described step 5, determines in uranium mineralizations, needs to determine " ancient uranium mineralization ", " modern uranium mineralization " type, " non-oil gas reduction mineralising " type, " earth's surface Colophonium absorbent-type uranium mineralization " type, specifically determines that method is as follows:
(1) " ancient uranium mineralization ", the method for " modern uranium mineralization " type are determined；
The interlayer oxidized zone formed before gas reduction effect is defined as " ancient interlayer oxidized zone ", and the uranium mineralization of formation is defined as " ancient uranium mineralization "；
The interlayer oxidized zone formed after gas reduction effect is defined as " modern interlayer oxidized zone ", and the uranium mineralization of formation is defined as " modern uranium mineralization "；
(1)Th<TuGas reduction is later than the plane of unconformity time action time
" ancient uranium mineralization " is one of uranium mineralizations；
(2)Th≥TuGas reduction time effect early than or equal to the plane of unconformity time
" modern uranium mineralization " is one of uranium mineralizations, there is not " ancient uranium mineralization "；
(3) there is multiple Tu, from Gu to being newly followed successively by Tu1、Tu2、Tu3Deng
Th<Tu1And Th≥Tu2(or Tu3Deng), then " ancient uranium mineralization " is one of uranium mineralizations, and " modern mineralising " is one of uranium mineralizations；
(2) method determining " non-oil gas reduction mineralising " type:
In sedimentary basin strong gas reduction active region, there is regional area is not affected by gas reduction effect.Gas reduction effect distribution figure according to step 2 establishment, do not suffering the Regional survey outcrop of oil-gas reactivation, borehole data, find the primary gray layer not suffering gas reduction effect, this primary gray layer can grow interlayer oxidized zone during plane of unconformity is grown, it is possible to forms sandstone-type uranium mineralization with respect.Such interlayer oxidized zone is defined as " non-oil gas reduction interlayer oxidized zone ", and the type uranium mineralization is defined as " non-oil gas reduction uranium mineralization "；
(3) method determining " earth's surface Colophonium absorbent-type uranium mineralization " type:
Behind oil gas crop out formed asphalitine, asphalitine can adsorption uranium element, make uranium element be enriched with in the sandstone of asphalitine and form uranium mineralization, such uranium mineralization small scale, such uranium mineralization is defined as " earth's surface Colophonium absorbent-type uranium mineralization ".
Described step 6 is set up in ore-search models, the uranium mineralizations determined according to step 5, sets up sedimentary basin strong gas reduction district Prospecting Sandstone-type Uranium Deposits model, and draws ore-search models with CorelDRAW, determines and look for ore deposit target, and ore-search models method for building up is as follows:
(6.1) each uranium mineralizations is plotted in ore-search models by the most suitable of destination layer position, place.
(6.2) " ancient interlayer oxidized zone " and " ancient uranium mineralization " is closer to basin ventral direction, and " modern interlayer oxidized zone " and " modern uranium mineralization " is closer to basin edge direction.
(6.3) " modern interlayer oxidized zone " preferential sandstone of " ancient interlayer oxidized zone " the most in early days, gravel rock stratum are grown.
Primary gray layer described in described step one shows as color gray, grey black, celadon, rich breeze, vegetal debris, presss from both sides coal seam, Fe2+/Fe3+>1。
In described step 2, selected map is advisable with 1:20 ten thousand to 1:5 ten thousand scale geologic map.
In described step 3, plane of unconformity refers to the large-scaled unconformity strata face of domain type, can have multiple plane of unconformity, each plane of unconformity corresponding time.
In step 4, three kinds of method of testing selection principle measuring the plane of unconformity times is based on the data degree of actual grasp, sample collecting quality, mineral select quality selection；
If fluid inclusion sheet can identifying hydrocarbon fluids inclusion enclave and hydrocarbon fluids inclusion enclave temperature can being measured, there is stratum thermal history evolution data can use " hydrocarbon fluids inclusion enclave stratum thermal history method "；
If oil sands sample can be picked out authigenic illite (purity > 95%) " authigenic illite K-Ar isotope tracling method method " can be used；
If able to find and the calcite cementation sandstone of the gas reduction effect formation same period, and collect enough samples, pick out carbonate cements, carbonate cements Sm Nd isotope tracling method method can be used.
Embodiment 1
According to outcrop investigation, geologic information, Northwestern Margin of Junggar Basin Jurassic system is primary for gray layer, rich breeze, vegetal debris in stratum, rich coal seam；The primary gravel rock stratum for Lycoperdon polymorphum Vitt of a set of thickness about 20m is grown, rich breeze, vegetal debris in gravel in the middle part of Tugulu group a subgroup of uniting under Cretaceous System.So Northwestern Margin of Junggar Basin destination layer is Lycoperdon polymorphum Vitt gravel rock stratum in the middle part of Tugulu group a subgroup of uniting under Jurassic system and Cretaceous System.
Step 2: delineation gas reduction effect distribution
By Northwestern Margin of Junggar Basin 1:20 ten thousand regional geologic map digitized.By Field Geology Investigations data, by the drilling data collected, oil-gas pool distribution data digitized on Northwestern Margin of Junggar Basin 1:20 ten thousand geologic map, and draw a circle to approve Jurassic system, Cretaceous System gas reduction effect distribution.
Step 3: determine the plane of unconformity time
According to areal geology data, the plane of unconformity determining Northwestern Margin of Junggar Basin domain type is the most whole dough-making powder (U1) between Jurassic system and Cretaceous System, the most whole dough-making powder (U2) between Cretaceous System and Paleogene System, and the corresponding plane of unconformity time is TU1、TU2
Step 4: measure gas reduction action time
This example have employed hydrocarbon fluids inclusion enclave stratum thermal history method and determines gas reduction action time, and measuring Northwestern Margin of Junggar Basin destination layer gas reduction action time is Upper Cretaceous Th。
Step 5: determine uranium mineralizations
(1) Northwestern Margin of Junggar Basin Th<Tu1, " ancient uranium mineralization " is one of uranium mineralizations.
Northwestern Margin of Junggar Basin Th>Tu2, Jurassic system growth three set " modern interlayer oxidized zone ", " modern uranium mineralization " is one of uranium mineralizations.
(2) according to the gas reduction effect distribution figure of delineation in step 2, find that Wu Er standing grain area exists the region not suffering gas reduction effect, a set of primary interlevel oxidation gravel rock stratum for gray layer is found in this region Cretaceous System Tugulu group a subgroup, glutenite is shown in residual breeze, this set sand body thickness about 20m, interlayer oxidized zone is grown larger, grow uranium mineralization, γ exceptional value is 70～130ur (background value is 30ur), and " non-oil gas reduction uranium mineralization " is one of uranium mineralizations.
(3) Northwestern Margin of Junggar Basin grows extensive Colophonium, Colophonium crop out, and bituminous sandstone adsorption uranium element forms uranium mineralization on a small scale, and " earth's surface Colophonium absorbent-type uranium mineralization " is one of uranium mineralizations.
Step 6: set up ore-search models and determine and look for ore deposit target
The uranium mineralizations determined according to step 5 sets up sedimentary basin strong gas reduction active region Prospecting Sandstone-type Uranium Deposits model.
Primarily looking for ore deposit target for " ancient uranium mineralization " and " non-oil gas reduction uranium mineralization " according to this model elaborates Northwestern Margin of Junggar Basin sandstone-type uranium mineralization with respect, secondary looks for ore deposit target for " modern uranium mineralization " and " earth's surface Colophonium absorbent-type uranium mineralization ".
Claims (8)
1. a sedimentary basin oil gas strong reducing action district Prospecting Sandstone-type Uranium Deposits method for establishing model, it is characterised in that: comprise the steps:
Step one, determines destination layer；
Investigation outcrop, drill core, color is in Lycoperdon polymorphum Vitt, sandstone to be destination layer containing the stratum of carbon dust；
Survey area geologic information, in data the color of record be Lycoperdon polymorphum Vitt, stratum containing carbon dust be destination layer；
Choosing Lycoperdon polymorphum Vitt containing the sandstone of carbon dust, gravel rock stratum as strong gas reduction active region Prospecting Sandstone-type Uranium Deposits destination layer, destination layer can be 1 to several；
Step 2, draws a circle to approve gas reduction effect distribution；
Investigation has appearing of gas reduction, records its layer of position and coordinate；
Investigation drilling data, record has layer position and the drilling well coordinate of gas reduction；
The oil-gas pool distribution figure of the departments such as investigation oil；
Above-mentioned outcrop, drilling well, oil-gas pool distribution figure are projected on appropriate scale geologic map, draws a circle to approve gas reduction effect distribution by layer position；
Step 3, determines the plane of unconformity time；
According to regional stratum, structure data, determining the plane of unconformity on destination layer position and time thereof, plane of unconformity can have 1 to arrive several, the corresponding time T of each plane of unconformityu, it is followed successively by T according to from Gu to new orderu1、Tu2、Tu3……。
Step 4, determines gas reduction T action timeh；
Step 5, determines uranium mineralizations；
Step 6, sets up ore-search models.
2. a kind of sedimentary basin oil gas strong reducing action district as claimed in claim 1 Prospecting Sandstone-type Uranium Deposits method for establishing model, it is characterized in that: determine that gas reduction uses three kinds of method of testings action time, complexity based on geologic process, selects suitable method to determine gas reduction T action time in destination layer according to practical situation in three kinds of method of testingsh；
Method one, fluid inclusion stratum thermal history method:
Gather green oil sandstone core sample to cut into slices, be cut into the inclusion enclave sheet that thickness is about 0.5mm；At fluorescence microscopy lens-belowed identifying hydrocarbon fluids inclusion enclave, hydrocarbon fluids inclusion enclave is distributed in group variety shape in carbonate cements, linearly distributed in quartz crack, be distributed in group variety shape in quartz secondary limit, hydrocarbon fluids inclusion enclave under fluorescence microscope in blue, yellow；Cold and hot of Linkam THMSG600 is utilized to measure hydrocarbon fluids inclusion enclave temperature；Measure hydrocarbon fluids inclusion enclave temperature throw in the thermal history evolution diagram of stratum, according to temperature corresponding with the layer position of sample collecting go out oil gas reduction time Th；
Method two, authigenic illite K-Ar isotope tracling method method:
Gather fresh drill core oil sands sample, example weight at least 1 kilogram, select authigenic illite mineral purity > the authigenic illite mineral of 95%, the authigenic illite picked out is carried out K-Ar isotopic dating, this age is the time T that gas reduction effect occursh；
Method three, carbonate cements Sm Nd isotope tracling method method:
Middle collection of appearing in the wild forms calcite cementation sample of sandstone, at least 1 kilogram of sample with gas reduction effect the same period；
Described the type calcite cementation sandstone features is:
1. it is distributed in lumps in the sandstone of gas reduction effect；
The most visible grey black oil, can smell " oil taste "；
Selecting carbonate cements 0.5 gram, the carbonate cements picked out is carried out Sm-Nd isotopic dating, this age is the time T that gas reduction effect occursh。
3. a kind of sedimentary basin oil gas strong reducing action district as claimed in claim 1 Prospecting Sandstone-type Uranium Deposits method for establishing model, it is characterized in that: described step 5, determine in uranium mineralizations, need to determine " ancient uranium mineralization ", " modern uranium mineralization " type, " non-oil gas reduction mineralising " type, " earth's surface Colophonium absorbent-type uranium mineralization " type, specifically determines that method is as follows:
(1) " ancient uranium mineralization ", the method for " modern uranium mineralization " type are determined；
The interlayer oxidized zone formed before gas reduction effect is defined as " ancient interlayer oxidized zone ", and the uranium mineralization of formation is defined as " ancient uranium mineralization "；
The interlayer oxidized zone formed after gas reduction effect is defined as " modern interlayer oxidized zone ", and the uranium mineralization of formation is defined as " modern uranium mineralization "；
(1)Th<TuGas reduction is later than the plane of unconformity time action time
" ancient uranium mineralization " is one of uranium mineralizations；
(2)Th≥TuGas reduction time effect early than or equal to the plane of unconformity time
" modern uranium mineralization " is one of uranium mineralizations, there is not " ancient uranium mineralization "；
(3) there is multiple Tu, from Gu to being newly followed successively by Tu1、Tu2、Tu3Deng
Th<Tu1And Th≥Tu2(or Tu3Deng), then " ancient uranium mineralization " is one of uranium mineralizations, and " modern mineralising " is one of uranium mineralizations；
(2) method determining " non-oil gas reduction mineralising " type:
In sedimentary basin strong gas reduction active region, there is regional area is not affected by gas reduction effect.Gas reduction effect distribution figure according to step 2 establishment, do not suffering the Regional survey outcrop of oil-gas reactivation, borehole data, find the primary gray layer not suffering gas reduction effect, this primary gray layer can grow interlayer oxidized zone during plane of unconformity is grown, it is possible to forms sandstone-type uranium mineralization with respect.Such interlayer oxidized zone is defined as " non-oil gas reduction interlayer oxidized zone ", and the type uranium mineralization is defined as " non-oil gas reduction uranium mineralization "；
(3) method determining " earth's surface Colophonium absorbent-type uranium mineralization " type:
Behind oil gas crop out formed asphalitine, asphalitine can adsorption uranium element, make uranium element be enriched with in the sandstone of asphalitine and form uranium mineralization, such uranium mineralization small scale, such uranium mineralization is defined as " earth's surface Colophonium absorbent-type uranium mineralization ".
4. a kind of sedimentary basin oil gas strong reducing action district as claimed in claim 1 Prospecting Sandstone-type Uranium Deposits method for establishing model, it is characterized in that: described step 6 is set up in ore-search models, the uranium mineralizations determined according to step 5, set up sedimentary basin strong gas reduction district Prospecting Sandstone-type Uranium Deposits model, and draw ore-search models with CorelDRAW, determining and look for ore deposit target, ore-search models method for building up is as follows:
(6.1) each uranium mineralizations is plotted in ore-search models by the most suitable of destination layer position, place.
(6.2) " ancient interlayer oxidized zone " and " ancient uranium mineralization " is closer to basin ventral direction, and " modern interlayer oxidized zone " and " modern uranium mineralization " is closer to basin edge direction.
(6.3) " modern interlayer oxidized zone " preferential sandstone of " ancient interlayer oxidized zone " the most in early days, gravel rock stratum are grown.
5. a kind of sedimentary basin oil gas strong reducing action district as claimed in claim 1 Prospecting Sandstone-type Uranium Deposits method for establishing model, it is characterized in that: described in described step one, primary gray layer shows as color gray, grey black, celadon, rich breeze, vegetal debris, press from both sides coal seam, Fe2+/Fe3+>1。
6. a kind of sedimentary basin oil gas strong reducing action district as claimed in claim 1 Prospecting Sandstone-type Uranium Deposits method for establishing model, it is characterised in that: in described step 2, selected map is advisable with 1:20 ten thousand to 1:5 ten thousand scale geologic map.
7. a kind of sedimentary basin oil gas strong reducing action district as claimed in claim 1 Prospecting Sandstone-type Uranium Deposits method for establishing model, it is characterized in that: in described step 3, plane of unconformity refers to the large-scaled unconformity strata face of domain type, can there is multiple plane of unconformity, each plane of unconformity corresponding time.
8. sedimentary basin oil gas strong reducing action district as claimed in claim 1 a kind of Prospecting Sandstone-type Uranium Deposits method for establishing model, it is characterised in that: in step 4, three kinds of method of testing selection principle measuring the plane of unconformity times is based on the data degree of actual grasp, sample collecting quality, mineral select quality selection；
If fluid inclusion sheet can identifying hydrocarbon fluids inclusion enclave and hydrocarbon fluids inclusion enclave temperature can being measured, there is stratum thermal history evolution data can use " hydrocarbon fluids inclusion enclave stratum thermal history method "；
If oil sands sample can be picked out authigenic illite (purity > 95%) " authigenic illite K-Ar isotope tracling method method " can be used；
If able to find and the calcite cementation sandstone of the gas reduction effect formation same period, and collect enough samples, pick out carbonate cements, carbonate cements Sm Nd isotope tracling method method can be used.
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| CN107367770A (en) * | 2017-06-12 | 2017-11-21 | 核工业北京地质研究院 | The technique for delineating of the favourable section of sandrock-type uranium-bearing Basin Metallogenic is soaked a kind ofly |
| CN109580498A (en) * | 2018-12-24 | 2019-04-05 | 核工业北京地质研究院 | Oxidized zone geology recognition methods between a kind of sandstone-type uranium mineralization with respect ledge |
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