CN112711078A - Method for identifying favorable sandstone type uranium mineralization sand body in deep sedimentary basin - Google Patents
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Abstract
The invention belongs to the technical field of uranium mineralization prediction, and particularly relates to a method for identifying sandstone-type uranium mineralization sand bodies beneficial to deep sedimentary basin, which comprises the following steps: collecting data and determining a uranium production basin section; analyzing a deposition system and a rock geochemical mark, and identifying a target layer containing ores; measuring audio magnetotelluric electricity and two-dimensional earthquake, and delineating the distribution range of sand bodies; and analyzing the parameters of the delineated sand body, and identifying the sand body favorable for sandstone-type uranium mineralization. The method disclosed by the invention has the advantages of high accuracy of the finished ore sand body, convenience, rapidness and low cost.
Description
Technical Field
The invention belongs to the technical field of uranium mineralization prediction, and particularly relates to a method for identifying sandstone-type uranium mineralization sand bodies beneficial to deep sedimentary basin.
Background
The sandstone-type uranium deposit has the characteristics of low ore grade, large area, large deposit reserve, low exploration and mining cost, environmental protection and the like, thereby becoming a main object for exploration and development of many countries. The formation of sandstone-type uranium ores can be summarized as: the uranium-containing oxygen-containing water stable for a long time forms good permeation and migration in the aquifer, and through the oxidation-reduction effect of the reducing component in the permeable layer, on one hand, the oxidation zone is continuously propelled towards the inner direction of the basin, on the other hand, the uranium is continuously activated, migrated and enriched, and finally, the uranium is accumulated and mineralized near a proper geochemical barrier. Therefore, there are two key points in the mineralization of sandstone-type uranium ores: firstly, an aquifer with good permeability, namely a sand body, needs to be arranged on a certain scale; and the other is proper geochemical barrier, namely the geochemical barrier is favorable for the mining environment. Because of the influence of overburden, sand in the deep portion of the sedimentary basin, particularly sand favorable to mineralization, is difficult to identify and locate.
At present, the general survey is mainly used for determining the approximate distribution range of sand bodies; the method is beneficial to forming the sand body of the ore through detailed investigation and exploration positioning, and the whole process is long in time consumption and high in cost.
Therefore, a method for identifying the beneficial sandstone-type uranium ore mineralization sand body is urgently needed to be developed, and the beneficial sandstone-type uranium ore mineralization sand body can be accurately and quickly identified and positioned.
Disclosure of Invention
The invention aims to provide a method for identifying sandstone-type uranium mineralization sand bodies favorable for deep sedimentary basin, which adopts a geological, geophysical prospecting and analysis combined means and utilizes the existing data to quickly determine basin sections favorable for uranium production; identifying a mineral-containing target layer by analyzing a deposition system and a rock geochemical marker; the sand body is defined by measuring audio magnetotelluric and two-dimensional earthquake; finally, the sand body beneficial to sandstone-type uranium mineralization is identified. The method disclosed by the invention has the advantages of high accuracy of the finished ore sand body, convenience, rapidness and low cost.
The technical scheme for realizing the purpose of the invention is as follows: a method for identifying favorable sandstone-type uranium mineralization sand bodies deep in sedimentary basins, comprising the following steps:
collecting data and determining a uranium production basin section;
analyzing a deposition system and a rock geochemical mark, and identifying a target layer containing ores;
step (3), measuring audio magnetotelluric electricity and two-dimensional earthquake, and delineating the distribution range of sand bodies;
and (4) analyzing the parameters of the delineated sand body, and identifying the sand body favorable for sandstone-type uranium mineralization.
Further, the determining the uranium-producing pot segment in the step (1) includes: and determining the basin type, the substrate maturity and the source of the etched source region uranium.
Further, the deposition phase zone in the deposition system in the step (2) comprises: river facies, delta facies and fan-end subphase of alluvial fan.
Further, the step (3) includes:
step (3.1), measuring audio magnetotelluric electricity, and drawing a plane distribution equivalent diagram of the buried depth of the substrate of the target layer and the thickness of the sand body;
step (3.2), measuring a two-dimensional earthquake, and drawing a plane distribution diagram of the thickness and the argillaceous content of the sandstone of the target layer;
and (3.3) drawing a sand body distribution diagram of a target layer and a sand body equal thickness diagram, and defining a sand body distribution range.
Further, the step (3.1) comprises:
step (3.1.1), laying an electromagnetic method measuring line;
step (3.1.2), collecting audio magnetotelluric data, processing and inverting the data, and drawing an electromagnetic section view;
and (3.1.3) correcting the geological interpretation interface in the electromagnetic section, obtaining a geological interpretation map of each electromagnetic method measuring line, and drawing a plane distribution equivalent map of the base burial depth and the sand body thickness of the target layer.
Further, the step (3.2) comprises:
step (3.2.1), laying seismic survey lines;
step (3.2.2), collecting two-dimensional seismic data, processing and explaining the data to obtain seismic data processing results of each seismic survey line;
and (3.2.3) carrying out inversion calculation on the seismic data processing result, measuring and calculating sandstone thickness and shale content data of a target layer of each seismic survey line, and drawing a plane distribution diagram of the sandstone thickness and the shale content of the target layer.
Further, the parameters of the sand body in the step (4) comprise: sand thickness, reduction capacity, clay content, redox ability, pH value.
The invention has the beneficial technical effects that:
1. the method for identifying the sandstone-type uranium mineralization sand body beneficial to the deep of the sedimentary basin has high accuracy, the accuracy rate reaches 60%, and the accuracy reaches 10 m;
2. the method for identifying the beneficial sandstone-type uranium ore-forming sand bodies in the deep sedimentary basin can effectively shorten the time for identifying and positioning the beneficial ore-forming sand bodies and reduce the cost.
Drawings
FIG. 1 is a flow chart of a method for identifying beneficial sandstone-type uranium mineralization sand bodies in the deep part of a sedimentary basin, which is provided by the invention;
FIG. 2 is an audio electromagnetic profile and lithologic interpretation of the Fangren Januse depression in example 1 of the present invention;
FIG. 3 is a seismic sand inversion cross-section of a Farnenzeer recess in example 1 of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in FIG. 1, the invention provides a method for identifying favorable sandstone-type uranium mineralization sand bodies in the deep part of a sedimentary basin, which comprises the following steps:
step (1), collecting data and determining uranium production basin section
Collecting geological, geophysical prospecting and drilling data of the sedimentary basin, and determining the uranium production basin section according to basin types, base maturity and uranium source condition of the eroded source region.
Step (1.1), basin type marking
The most important uranium-producing basin types in China are land foreland basins and mountain basins in an impact extrusion structural environment, the important uranium-producing basin types are mainland edge valley cracking basins in a crack-sinking structural environment, and the secondary uranium-producing basin types are mountain foreland deflection basins in an impact extrusion structural environment.
Step (1.2), marking of substrate maturity
The sandstone-type uranium deposit is distributed within 20km around mature continental shell, and the mature base mark is K of the Yu rock system of the base development2O/Na2O is more than 0.60, and FeO/MgO is more than 1.0.
Step (1.3), etching source area uranium source sign
The existence of uranium-rich rocks in the base and erosion source areas of the uranium production basin section is a necessary condition for uranium mineralization formation. The uranium-rich lithology is granite (mainly dimoviscoite granite, biotite granite, muscovite granite, etc.), precambrian metamorphic rock, acidic invaded rock and volcanic rock, uranium-rich shale, etc., and the U content is more than 5 × 10－6And Th/U value > 3.
Step (2), analyzing a deposition system and a rock geochemical mark and identifying a target layer containing ores
And (3) collecting construction data in the uranium production basin section determined in the step (1), developing geochemical analysis of a deposition system and rocks, and identifying a target layer containing minerals.
Step (2.1), sedimentary facies marking
The types of favorable sedimentary facies zones for producing sandstone-type uranium ores mainly comprise a river facies, a delta facies and a fan end subphase of an alluvial fan.
Step (2.2), geochemical marking of rock
The lithologic structure has a lower gray upper red (miscellaneous) color structure, the gray layer develops gray sand body, and the uranium content of the gray sand body is more than 5 multiplied by 10－6。
Step (3) measuring audio magnetotelluric electricity and two-dimensional earthquake and determining the distribution range of sand bodies
And (3) in the beneficial uranium production basin section determined in the step (1), carrying out audio frequency earth electromagnetic measurement and two-dimensional seismic measurement aiming at the ore-bearing target layer identified in the step (2), and defining the distribution range of sand bodies through explanation.
Step (3.1), measuring audio magnetotelluric electricity, drawing the plane distribution diagram of the target layer substrate and the sand body
Step (3.1.1), in the beneficial uranium production basin section determined in the step (1), aiming at the ore-bearing target layer identified in the step (2), parallel electromagnetic method measuring lines are arranged according to the line distance of 2.5 km;
step (3.1.2), aiming at the electromagnetic method measuring line distributed in the step (3.1.1), audio magnetotelluric data acquisition is carried out by utilizing electromagnetic instruments such as V8 and the like to obtain electromagnetic original data; processing the data by utilizing electromagnetic data processing software such as MTPioneer and the like, performing Fourier transform, self-power spectrum calculation, impedance calculation and the like, and performing two-dimensional nonlinear conjugate gradient inversion calculation and inversion to obtain an automatic calculation process, and importing the data into surfer software to draw an electromagnetic section view after obtaining an electromagnetic data processing result;
and (3.1.3) correcting a geological interpretation interface in the electromagnetic section map by contrasting logging resistivity data of the drill holes on the electromagnetic method measuring lines, and dividing the sediment basin substrate form and the distribution characteristics of sand bodies in the target layer according to the resistivity abrupt change interface and the rock resistivity characteristics in the region to obtain a geological interpretation map of each electromagnetic method measuring line. And (4) finishing the elevation values of the interpretation boundary lines and the corresponding plane coordinate positions, and then drawing a plane distribution equivalent graph of the buried depth of the target layer substrate and the sand body thickness in surfer software.
Step (3.2), measuring the two-dimensional earthquake, and drawing a plane distribution diagram of the thickness and the argillaceous content of the sandstone of the target layer
Step (3.2.1), laying seismic survey lines according to 4 Feng-shaped lines in the uranium basin section determined in the step (1) and aiming at the ore-bearing target layer identified in the step (2);
step (3.2.2), aiming at the seismic survey line distributed in the step (3.2.1), utilizing digital seismographs such as 408UL, 428XL and the like to carry out two-dimensional seismic data acquisition to obtain seismic original data; processing the data by using seismic data processing software such as CGG (grade-G) and Landmark to perform static correction, filtering, deconvolution, migration imaging and the like to form a homophase axis section, and then performing construction and stratum interpretation according to the homophase axis characteristics to obtain the seismic data processing result of each seismic survey line;
and (3.2.3) performing inversion calculation on the seismic data processing result by utilizing Geoview software (the process is operation calculation after data loading), obtaining lithologic distribution data of sandstone and mudstone of the target layer of each seismic survey line, calculating sandstone thickness and mudstone content data (the mudstone content is the thickness of the mudstone layer/the total thickness of the stratum) of the target layer of each seismic survey line according to the lithologic distribution data, and drawing a planar distribution diagram of the sandstone thickness and the mudstone content of the target layer by adopting surfer software.
And (3.3) correcting by using the plane distribution diagram of the sand body drawn in the step (3.1.3) and the plane distribution diagram of the sand thickness and the argillaceous content of the target layer drawn in the step (3.2.3) to comprehensively draw a sand body distribution diagram and a sand body equal thickness diagram of the target layer.
Step (4), analyzing the parameters of the delineated sand body, and identifying the sand body favorable for sandstone-type uranium mineralization
And (4) deeply analyzing parameters such as sand thickness, reduction capacity, clay content, redox capacity, pH value and the like in the sand body defined in the step (3), and identifying and positioning the favorable sand body.
Wherein, the sand thickness, the reduction capacity and the clay content mainly reflect the property of the ore-containing sand, represent the environmental characteristics in the sedimentation period and are irrelevant to the after-production effect; the redox ability and the pH value are parameters representing the post-reforming action and represent the mineralizing action parameters.
The sand body thickness parameter: the thickness of the single-layer sand body is more than 15 meters and less than 80 meters, which is beneficial to the formation of sandstone-type uranium ores.
Reduction capacity: the ore-containing sand body is generally rich in organic reducing medium, and the content of organic matters is generally more than 0.5 percent.
Clay content: clay content available principal element Al2O3And the content of CaO. Al in ore-forming sand2O3High content of CaO, Al2O310.33 to 12.56 percent of CaO, 0.51 to 4.68 percent of CaO and Al2O3The content of the CaO is 10.84 to 17.24 percent.
Redox ability: the parameters for characterizing the redox capability of the rock mainly comprise the redox potential (delta Eh) and the content and ratio of iron oxide in the rock. Wherein the oxidation-reduction potential (delta Eh) value of the ore-forming sand body is more than 60 mV; FeO content of 0.45-0.95%, Fe2O30.50-0.95% of Fe2+/Fe3+0.50 to 1.10.
pH value: the pH value of the ore forming sand body is weak and acidic, and the pH value is 4.0-7.5.
Example 1 takes a two-link basin as an example, the sand body identification of the favorable sandstone-type uranium mineralization is carried out, and the specific steps are as follows:
step (1), collecting data and determining uranium production basin section
Continental land under the condition that the twin basin is a crack-cave structureThe marginal fissure valley basin is an important uranium-producing basin. The concave forehead-kernel-on-Er in the basin is located at the western edge of the Xianli Haote land, and the base develops Yuan metamorphic lithology, K2O/Na2O is 2.23, and FeO/MgO is 2.24; large-area development of diligent dilong granite in Weijing rock mass of erosion source area, uranium content up to 6.5X 10－6And the Th/U value reaches 8.8.
Therefore, the forehead donglar depression in the two-pot basin was identified as the uranium producing pot segment.
Step (2), analyzing a deposition system and a rock geochemical mark and identifying a target layer containing ores
The two-in-one basin and the two-in-one group of developed river-lake sediment systems with the Fangren glargine depression have red sand bodies and no gray sand bodies; the lower chalkiness of the forehead, the geiger, and the glager are divided into an upper part of the sehan group, a lower part of the sehan group, and the upper part of the sehan group develops a river phase, and a sand body is yellow and gray and has a lower gray upper variegated structure; the lower section of the Sihan group develops delta facies, sand bodies are gray, and the sand bodies have lower gray upper variegated structures; in the delta phase of the developing sector of the Tenger group, the sand body is gray and has a lower gray upper variegated structure. Through statistical analysis, the average uranium content of the red sandstone in the two-connected group of the two-connected basin, the forehead, the Danre and the Niger-6Average uranium content of 12.72 multiplied by 10 in upper gray sandstone of the Sehan group-6Average uranium content of 6.09 multiplied by 10 in lower gray sandstone of the sihaman group-6Average uranium content of 4.42 x 10 in grey sandstone of the Tenger group-6。
Therefore, the most favorable ore-bearing target layer of the sandstone-type uranium ore of the zoned basin forehead dongles is the upper section of the seohang group, and then the lower section of the seohang group.
Step (3) measuring audio magnetotelluric electricity and two-dimensional earthquake and determining the distribution range of sand bodies
As shown in FIG. 2, YC-A is a northern-west-southern-east audio frequency earth electromagnetic section view and lithology explanation diagram of the concave Fangren Dong, and the lithology explanation shows that the sand body in the target layer of the section has the characteristics of being thin in the northern west and thick in the southern east and has the sand thickness of 30-220 meters.
As shown in fig. 3, L11-1 is a north west-south east seismic sand inversion profile of the fanner hallow recess, wherein 1-sand; 2-mudstone; 3-the top border of the upper segment of the Saohan group; 4-the bottom border of the upper section of the Saohan group. The sand body development characteristics of the upper section of the target stratosphere group of the section show the downward concave sedimentation characteristics of a river phase, the sand body development of the lower section is 20-160 m thick, and particularly the sand body development thickness of 2200-5000 sections of the cross distance is more than 100 m.
And (3) integrating the audio magnetotelluric and two-dimensional seismic results, and circling 2 abrasive belts according to the medium-high resistance and discontinuous strong reflection homophase axis of the Fanqie-Dan depression of the two-link basin. One is a Nu and Ting deep abrasive belt which develops at the upper section of the Seahan group, and the abrasive belt is a riverway cause, has the length of 30km and the width of 5-10 km and is spread in the south-west-north-east direction; the other one is a Dalsu abrasive belt which develops at the lower section of the Sihan group, is the cause of the fan delta, has the length of 20km and the width of 15km, and is distributed in a fan shape.
Step (4), analyzing the parameters of the delineated sand body, and identifying the sand body favorable for sandstone-type uranium mineralization
The thickness of the Nu and Tingyuan deep sand body on the upper section of the Saohan group of the Erlian basin and the Fangren Dong, the Oldham, the Guanhan, the Ningnan and the Tingnan deep sand body is 20-60 m, the content of organic carbon in the sand body is 0.55%, and Al in the sand body is2O3+ CaO content 13.83%, oxidation-reduction potential (. DELTA.eh) 98mV, Fe2+/Fe3+0.59 and a pH of 6.2.
The thickness of the lower Dalsuosha body of the Saohan group which is sunken in the Erlian basin and the Fangren glaucus is 20-30 m, the content of organic carbon in the sand body is 0.75%, and Al is contained in the sand body2O3+ CaO content 16.31%, oxidation-reduction potential (. DELTA.eh) 72mV, Fe2+/Fe3+0.71 and a pH of 6.6.
Therefore, the abrasive belts developed on the nu and the tongtian deep part of the Saohan group of the upper section of the Saohan group of the Erlian basin forehead dongler depression and the abrasive belts developed on the Dalsu of the lower section of the Saohan group are favorable ore-forming sand bodies.
The present invention has been described in detail with reference to the drawings and examples, but the present invention is not limited to the examples, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention. The prior art can be adopted in the content which is not described in detail in the invention.
Claims (7)
1. A method for identifying favorable sandstone-type uranium mineralization sand bodies in deep sedimentary basin is characterized by comprising the following steps:
collecting data and determining a uranium production basin section;
analyzing a deposition system and a rock geochemical mark, and identifying a target layer containing ores;
step (3), measuring audio magnetotelluric electricity and two-dimensional earthquake, and delineating the distribution range of sand bodies;
and (4) analyzing the parameters of the delineated sand body, and identifying the sand body favorable for sandstone-type uranium mineralization.
2. The method for identifying favorable sandstone-type uranium mineralization sand bodies in the deep sedimentary basin according to claim 1, wherein the step (1) of determining the uranium production basin section comprises the following steps: and determining the basin type, the substrate maturity and the source of the etched source region uranium.
3. The method for identifying favorable sandstone-type uranium mineralization sand bodies in the deep sedimentary basin according to claim 1, wherein the favorable sedimentary facies belt in the sedimentary system in the step (2) comprises the following steps: river facies, delta facies and fan-end subphase of alluvial fan.
4. The method for identifying favorable sandstone-type uranium mineralization sand bodies in deep sedimentary basins according to claim 1, wherein the step (3) comprises the following steps:
step (3.1), measuring audio magnetotelluric electricity, and drawing a plane distribution equivalent diagram of the buried depth of the substrate of the target layer and the thickness of the sand body;
step (3.2), measuring a two-dimensional earthquake, and drawing a plane distribution diagram of the thickness and the argillaceous content of the sandstone of the target layer;
and (3.3) drawing a sand body distribution diagram of a target layer and a sand body equal thickness diagram, and defining a sand body distribution range.
5. A method for identifying favorable sandstone-type uranium mineralization sand bodies in deep sedimentary basins according to claim 4, wherein the step (3.1) comprises the following steps:
step (3.1.1), laying an electromagnetic method measuring line;
step (3.1.2), collecting audio magnetotelluric data, processing and inverting the data, and drawing an electromagnetic section view;
and (3.1.3) correcting the geological interpretation interface in the electromagnetic section, obtaining a geological interpretation map of each electromagnetic method measuring line, and drawing a plane distribution equivalent map of the base burial depth and the sand body thickness of the target layer.
6. A method for identifying favorable sandstone-type uranium mineralization sand bodies in deep sedimentary basins according to claim 4, wherein the step (3.2) comprises:
step (3.2.1), laying seismic survey lines;
step (3.2.2), collecting two-dimensional seismic data, processing and explaining the data to obtain seismic data processing results of each seismic survey line;
and (3.2.3) carrying out inversion calculation on the seismic data processing result, measuring and calculating sandstone thickness and shale content data of a target layer of each seismic survey line, and drawing a plane distribution diagram of the sandstone thickness and the shale content of the target layer.
7. The method for identifying favorable sandstone-type uranium mineralization sand bodies in deep sedimentary basins according to claim 1, wherein the parameters of the sand bodies in the step (4) comprise: sand thickness, reduction capacity, clay content, redox ability, pH value.
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