CN114943310B - Method for determining sandstone uranium deposit mineralization zone in oil-gas seepage zone - Google Patents
Method for determining sandstone uranium deposit mineralization zone in oil-gas seepage zone Download PDFInfo
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Abstract
The application relates to a method for analyzing a geologic body by means of physical and chemical properties of the geologic body, in particular to a method for determining an ore-forming zone of sandstone uranium ore in an oil-gas seepage zone, which comprises the following steps: determining a reducing color sand body distribution area in an oil gas seepage area; determining an oil-gas fluid dissipation area; determining an ore control fracture distribution area in an oil gas seepage area; determining the cause of uranium ore bodies in the reduced color sand bodies; and determining an ore-forming zone of the sandstone uranium ore in the oil and gas seepage zone, wherein if the uranium ore in the reducing color sand body is determined to be formed under the action of seepage fluid, the ore-forming zone is determined based on the superposed region of the reducing color sand body distribution zone, the oil and gas seepage zone and the fracture structure distribution zone. According to the method for determining the sandstone uranium deposit mineralization zone in the oil and gas seepage area, the mineralization zone of sandstone uranium deposit can be effectively determined in the oil and gas seepage area, and a basis is provided for geological exploration and deployment of the sandstone uranium deposit in the oil and gas seepage area.
Description
Technical Field
The application relates to a method for analyzing rock mass by means of physical and chemical properties of the rock mass, in particular to a method for determining an ore-forming zone of sandstone uranium ores in an oil-gas seepage zone.
Background
The sandstone uranium deposit geological exploration and research work mainly adopts an interlayer oxidation zone theory and an aqueous uranium mineralization theory, and is mainly carried out on shallow layers of basin edges to search interlayer oxidation zone type uranium deposits and submerged oxidation zone type uranium deposits. With the continuous extension of uranium ore exploration and research work to the interior and deep of the basin, ore deposits which are difficult to clarify an ore forming mechanism by using an interlaminar oxidation zone theory and an aqueous uranium ore forming theory are discovered, the uranium ore deposits have close relation with the seepage action of an oil and gas production area in the basin, and a method capable of effectively determining a sandstone uranium ore forming zone in the oil and gas seepage area is urgently needed.
Disclosure of Invention
In view of the above, the present application has been made to provide a sandstone uranium deposit mineralization zone determination method in an oil and gas seepage zone that overcomes or at least partially solves the above-mentioned problems.
According to an embodiment of the application, a sandstone uranium deposit mineralization zone determination method in an oil and gas seepage zone comprises the following steps: determining a reducing color sand body distribution area in the oil gas seepage area, wherein the reducing color sand body distribution area is an area in which reducing color sand bodies formed through alteration in oxidation color construction are distributed; determining an oil gas dissipation area in the oil gas seepage area, wherein the oil gas dissipation area is an area where oil gas and/or coal bed gas in the oil gas seepage area are dissipated; determining an ore-control fracture distribution area in the oil-gas seepage area, wherein the ore-control fracture distribution area is a fracture structure distribution area which communicates the stratum where the oil-gas field and/or the coal field in the oil-gas seepage area is located with the stratum where the oxidation color is built; determining the cause of the uranium ore body in the reducing sand body; and determining an ore-forming zone of the sandstone uranium ore in the oil and gas seepage zone, wherein if the uranium ore in the reducing color sand body is determined to be formed under the action of seepage fluid, the ore-forming zone is determined based on the superposed region of the reducing color sand body distribution zone, the oil and gas seepage zone and the fracture structure distribution zone.
According to the method for determining the sandstone uranium deposit mineralization zone in the oil and gas seepage area, the mineralization zone of sandstone uranium deposit can be effectively determined in the oil and gas seepage area, and a basis is provided for geological exploration and deployment of the sandstone uranium deposit in the oil and gas seepage area.
Drawings
Fig. 1 is a flowchart of a sandstone uranium deposit mineralization zone determination method in an oil and gas exudation zone according to an embodiment of the present application;
FIG. 2 is a schematic view of a reducing color sand distribution area according to an embodiment of the present application;
FIG. 3 is a schematic view of a field distribution according to an embodiment of the present application;
FIG. 4 is a schematic view of a controlled ore fracture distribution zone according to an embodiment of the present application;
fig. 5 is a schematic diagram of a mineralization zone in accordance with an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clear, the technical solutions of the present application will be described below in detail and completely with reference to the accompanying drawings of the embodiments of the present application. It should be apparent that the described embodiment is one embodiment of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the application without inventive effort, are within the scope of protection of the application.
It is to be noted that, unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which this application belongs. If the description "first", "second", etc. is referred to throughout, the description of "first", "second", etc. is used only for distinguishing similar objects, and is not to be construed as indicating or implying a relative importance, order or number of technical features indicated, it being understood that the data described in "first", "second", etc. may be interchanged where appropriate. If "and/or" is presented throughout, it is meant to include three juxtapositions, exemplified by "A and/or B" and including either scheme A, or scheme B, or schemes in which both A and B are satisfied.
An embodiment of the present application provides a method for determining an ore formation zone of a sandstone uranium deposit in an oil-gas seepage zone, with reference to fig. 1, including:
step S102: and determining a reducing color sand body distribution area in the oil gas seepage area. In this embodiment, the reduced color sand body distribution region refers to a region where reduced color sand bodies formed through alteration in the construction of the oxidized color are distributed.
Step S104: and determining an oil and gas escape area in the oil and gas seepage area. In this embodiment, the oil gas dissipation area refers to an area where oil gas and/or coal bed gas in the oil gas seepage area are/is dissipated.
Step S106: and determining an ore-control fracture distribution area in the oil-gas seepage area. In this embodiment, the mine-control fracture distribution area refers to an area where fracture structures are distributed, the fracture structures communicating an oil-gas field and/or a coal field in an oil-gas seepage area with a formation where an oxidized color is built.
Step S108: and determining the cause of the uranium ore body in the reducing sand body.
Step S110: and determining an ore-forming zone of the sandstone uranium ore in the oil and gas seepage zone. If it is determined in step S108 that the uranium ore in the reduced-color sand is formed by the effect of the effusion fluid, the ore-forming zone may be determined in step S110 on the basis of the overlapping region of the reduced-color sand distribution region, the oil-gas emission region, and the fracture structure distribution region.
In step S102, a reducing sand distribution area in an oil and gas seepage area needs to be determined, where the oil and gas seepage area may generally refer to an area where organic energy mineral products exist and oil and gas are leaked, and the oil and gas seepage area is usually located in a basin and may develop organic energy mineral products such as an oil and gas field and a coal field, which can generate oil and gas leakage, for example, oil and gas leaked from the oil and gas field and coal field gas leaked from the coal field, and the like. The formation in which these fields, coal fields, are located is also referred to as deep formation in the relevant part below.
The application provides that oil gas dissipation of these organic energy minerals is closely related with the ore formation of sandstone uranium ore, and the oil gas of dissipation will ooze as reducing fluid in the stratum above oil gas field, the coal field, for example develop in the stratum that has the oxidation color to build, and change the oxidation color sand body among them, increase its reduction capacity, the uranium of wherein carrying also will deposit the enrichment and form the uranium ore body, after the formation of uranium ore body, the seepage of oil gas, dissipation will also play the effect of ore deposit-keeping, avoid the uranium ore body to be oxidized and destroy.
Based on this, the application firstly determines the area of the oxide color construction of the oil and gas exudation area where the reduced color sand bodies formed by alteration are distributed, and the reduced color sand bodies have larger possibility of forming uranium mineralization through transformation of exudation fluid formed by oil and gas exudation.
Determining the reduced sand distribution area in the oil and gas seeping area can be achieved based on geological data in the oil and gas seeping area, which may include, but is not limited to, borehole data, geological profiles, construction schemes, geophysical comprehensive profiles, seismic profiles, and the like, and existing geological data in the oil and gas seeping area may be collected and/or geological exploration may be performed on the oil and gas seeping area to obtain required geological data, which is not limited thereto. A schematic view of the reducing color sand distribution area determined in one embodiment is shown in fig. 2, which shows the reducing color sand 21, the oxidized color structure 22, and the transition zone 23 between the oxidized color structure and the reducing color sand, and the areas of the reducing color sand 21 and the transition zone 23 in the figure can be taken together as the reducing color sand distribution area in the present application as an example.
In step S104, an oil and gas escape area in the oil and gas seepage area is determined, and as described above, formation of sandstone uranium ores in the oil and gas seepage area is closely related to oil and gas escape, and for this purpose, it is required to determine which areas in the oil and gas seepage area have oil and gas escape, so as to provide a basis for subsequently determining the sandstone uranium ore formation area.
The occurrence of oil and gas leakage is closely related to the existence of a fracture structure, so that a person skilled in the art can analyze and predict an area where oil and gas leakage is likely to occur based on the distribution situation of organic energy minerals such as an oil and gas field and a coal field in an oil and gas seepage area and the distribution situation of the fracture structure therein, and can perform comprehensive analysis by combining geological data such as chemical exploration data and the like to determine the oil and gas leakage area.
In fig. 3, a field distribution diagram in one embodiment is shown, in fig. 4, a fracture configuration distribution diagram in one embodiment is shown, and as an example, when determining the oil and gas escape area, the oil and gas escape area can be comprehensively determined based on the distribution of the oil and gas field 31 in fig. 3 and the distribution of the fracture configuration 41 in fig. 4, in combination with the property, the formation time, the evolution period and the like of the fracture configuration 41.
In step S106, it is necessary to determine a controlled ore fracture configuration distribution region in the oil and gas seepage region. As described above, the exudation fluid formed by oil and gas dispersion needs to be transferred to the oxidation color construction for action, so the formation of uranium mineralization needs to be a channel for upward migration of the exudation fluid, and the channel can be a fracture structure communicating the deep stratum of the oil and gas field and the coal field with the stratum of the oxidation color construction, and the area of the fracture structure is used as a mineral-control fracture structure distribution area in the embodiment.
One skilled in the art can determine the distribution area of the controlled ore fracture structure based on geological data such as geological profile analysis, fracture structure distribution map, oil and gas field and coal field distribution map in the oil and gas seepage area, and the like, without limitation. Referring still to fig. 4, these fractured structures 41 may be analyzed, for example, a cross section of these fractured structures 41 may be analyzed, and the fractured structures communicating the deep formation where the oil and gas field is located and the formation where the above oxidation color building is located are selected, and the area where such fractured structures are distributed may be used as the distribution area of the mineral control fractured structures in the present application.
It is understood that if there is a uranium ore body formed by the seepage fluid action described above, the uranium ore body will be formed at the position where the reducing color sand body distribution area, the oil and gas escape area and the ore-control fracture structure distribution area are overlapped, and the ore-forming area can be determined based on the overlapped area of the reducing color sand body distribution area, the oil and gas escape area and the ore-control fracture structure distribution area, however, before the ore-forming area is determined, the cause of the uranium ore body in the reducing color sand body needs to be determined in step S108, and after the uranium ore body is determined to be formed by the seepage fluid action, the determination of the ore-forming area in step S110 can be further completed to ensure the effectiveness and accuracy of the determined ore-forming area, and avoid the loss caused by misjudgment.
When the cause of the uranium ore body in the reducing color sand body is determined in step S108, the reducing color sand body may be sampled, and an abnormal uranium mineralization site in the reducing color sand body may be selected for sampling based on borehole logging data, remote sensing data, physical and chemical exploration data, and the like, so as to ensure that the collected sample of the reducing color sand body contains the uranium ore body. Then, whether the uranium ore body is formed by the function of the effusion fluid can be determined by identifying the form of the uranium ore body in the reduction color sand body, the evolution process of the uranium ore body, the source of mineral matter in the reduction color sand body and the like. In general, if it can be determined that a uranium ore in a reduced-color sand has been reformed by a reducing fluid and that a mineral in the reduced-color sand has exuded from an oil and gas field and/or a deep formation in which the coal field is located, it can be determined that the uranium ore in the reduced-color sand has formed as a function of the exuding fluid.
It is understood that if it is not determined whether the uranium ore body is formed by the action of the effusion fluid or not, other mineralization theories may be used for explanation, and further other suitable mineralization theories may be selected for the determination of the mineralization zone, which will not be described herein again.
After the uranium ore body is determined to be formed under the action of the exudation fluid, in step S110, an ore-forming zone is determined based on the superposed region of the reducing color sand body distribution region, the oil and gas escape region and the ore-control fracture structure distribution region, and understandably, the uranium ore body develops in the layer where the reducing color sand body is located, so that the ore-forming zone is also determined in the layer where the reducing color sand body is located, and the oil and gas escape region and the ore-control fracture structure distribution region are actually located at the layer below the layer where the reducing color sand body is located.
A schematic diagram of the formation zone determined in one embodiment is shown in fig. 5, and the contents shown in fig. 2, 3 and 4 are superimposed in fig. 5. in this embodiment, an oil and gas escape area (not shown) is determined based on the analysis of the oil and gas field 31 and the fracture structure 41, a control fracture structure distribution area (not shown) is determined based on the analysis of the fracture structure 41, and finally, the formation zone 51 is determined based on the superposition of these areas.
According to the method, the mineralization zone of the sandstone uranium ore can be effectively determined in the oil-gas exudation area, a basis is provided for geological exploration and deployment of the sandstone uranium ore in the oil-gas exudation area, and the ore finding efficiency is improved.
Several methods capable of determining the cause of uranium ore bodies in the reducing sand will be described below, which can be used individually or in combination to determine the cause of uranium ore bodies in the reducing sand.
In some embodiments, in determining the cause of uranium ore in the reducing sand, the action of the uranium ore in the reducing sand through the reducing fluid may be determined first, followed by determining the source of the reducing fluid, and if it is determined that the reducing fluid is exuded from the oil and gas field and/or the formation in which the coal field is located, the exudation fluid may be the reducing fluid described above, and it may be determined that uranium ore in the reducing sand is formed through the action of the exudation fluid.
Whether the reduced color sand body is formed through the transformation of the reducing fluid or not can be determined through analyzing the alteration characteristics of the reduced color sand body, the structural deposition characteristics in the stratum where the reduced color sand body is located, the structural evolution history and the like, and whether the uranium ore body in the reduced color sand body is transformed through the reducing fluid or not is further determined. The source of the minerals in the reduced color sand bodies may then be analyzed to determine whether the reduced fluid is a seepage fluid that seeps from the oil and gas field and/or the formation in which the field is located.
In some embodiments, in determining the effect of the uranium ore bodies in the reducing color sand bodies passing through the reducing fluid, the alteration characteristics of the reducing color sand bodies may be determined first, and if layered, lenticular and/or lumpy oxidized color sand bodies remain in the reducing color sand bodies, the effect of the uranium ore bodies in the reducing color sand bodies passing through the reducing fluid may be determined.
Specifically, if lamellar, lenticular or lumpy oxide sand remains in the reduced sand, it is considered that the reduced sand is formed by the early oxidation, the medium oxidation + reduction alteration alternation, and the later reduction alteration superposition, and it can be determined that the uranium ore formation is also formed by the early sedimentary diagenesis, the submerged oxidation, the medium interlayer oxidation + reduction fluid superposition mineralization, and the later reduction alteration preservation.
In addition to the above-described determination of whether the uranium ore body in the reducing sand body is transformed by the reducing fluid based on the alteration characteristics, a person skilled in the art may also determine whether the uranium ore body is transformed by the reducing fluid by means of structural characteristic analysis, structural inversion and the like, and details thereof are not repeated here.
In some embodiments, determining the source of the reducing fluid may specifically include: and determining the source of the reducing fluid based on the source of the organic matter in the reducing color sand body, wherein if the organic matter seeping from the oil and gas field and/or the stratum of the coal field exists in the reducing color sand body, determining that the reducing fluid seeps from the oil and gas field and/or the stratum of the coal field.
The present application proposes that the reducing fluid exuded from the formation of the field and/or coal is generally rich in organic matter and, unlike the organic matter resulting from the infiltration of surface water, the organic matter resulting from the reducing fluid exuded from the formation of the field and/or coal is generally darker in color and in a mobile state, such as bitumen. Also, the reducing fluid exuded from the formation in which the field and/or coal is located may also include hydrocarbons, kerogen of the sapropel type which is more mature, and the like. One skilled in the art can use appropriate testing methods to identify the source of organic matter in the reduced color sand, for example, microscopic observation, inclusion test analysis, acid hydrolysis hydrocarbon analysis, etc., to determine the morphology and type of organic matter contained in the reduced color sand, and thus whether there is organic matter that is exuded from the oil and gas field and/or the formation in which the coal field is located.
In some embodiments, determining the source of the reducing fluid may include: determining the source of the reducing fluid based on the type of uranium ore bodies in the reducing color sand and associated minerals of the uranium ore bodies, and determining that the reducing fluid seeps from the oil and gas field and/or the stratum in which the coal field is located if the type of uranium ore bodies in the reducing color sand bodies comprises uranite and/or uraninite and the associated minerals of the uranium ore bodies comprise at least one of chalcopyrite, pyrite, sphalerite and galena.
It is also proposed that the uranium ore bodies formed by leaching the reducing fluid from the formation where the oil and gas field and/or coal field are located are typically of the type of uraninite, etc. and are typically associated with minerals such as chalcopyrite, pyrite, sphalerite, galena, etc. one skilled in the art can observe the type of uranium ore body and its associated minerals by means of microscopic observation, spectral analysis by a mineral analyzer, backscattered electron images, etc. to determine leaching of the reducing fluid from the formation where the oil and gas field and/or coal field are located, as compared to uranium ore bodies formed by subsurface leaching.
In some embodiments, determining the source of the reducing fluid may further comprise: the source of the reducing fluid is determined based on the elemental content in the reducing colored sand body. In addition to the organic matter mentioned above, the reducing fluids exuded from the formation in which the oil and gas fields and/or coal fields are located differ from the fluids formed by the infiltration of surface water by major elements and trace elements, resulting in differences in the content of the reduced-color sand bodies subjected to the action of the exuding fluids compared to the primary reduced-color sand bodies or reduced-color sand bodies of other origin. The technical personnel in the field can analyze the element content of the reducing color sand body, compare the element content with the related element content in the reducing color sand body of the primary cause, determine the migration condition of the element, and further judge whether the reducing fluid seeps out of the oil and gas field and/or the stratum where the coal field is located according to the migration condition of the element.
In addition to the methods described above, the skilled person can also use other suitable methods to identify the source of the reducing fluid, for example, by using the sulfur isotope value in pyrite symbiotic with uranium ore, the change of trace element value, etc., and so on, which will not be described in detail herein.
In some embodiments, the determining the reducing sand distribution area in the oil and gas seepage area in step S102 may specifically include: determining a basin area of an oil and gas seepage area; determining an oxidation color build-up sedimentary formation in the basin area; and determining a reducing color sand body distribution area in the stratum of the oxide color building sediment.
As described above, oil and gas fields and coal fields, etc. are typically developed in basin areas, and thus, the basin area where the oil and gas exudation zone is located may be first determined, and then the oxidation color in that basin area is determined to build up the sedimentary formations.
The method can collect data of basic geology, uranium deposit geology, hydrogeology, oil gas, coal fields and other mineral geological survey reports, result reports, geological foundation maps, documents and the like related to the basin area, arrange geological profiles, borehole well-connecting profiles, seismic profiles, geophysical prospecting magnetic method, electrical method profiles and the like of the basin area based on the data to analyze sedimentary built stratigraphic structure and structural evolution characteristics in the basin area, further prepare sedimentary built maps, rock geochemistry maps and the like based on the data to determine the sedimentary of oxidative color built sediments in the basin area and further determine the distribution area of reductive color sand bodies in the oxidative color built.
In some embodiments, in determining a basin zone of a hydrocarbon seepage zone, a basin zone in which fractures are present that tunnel through the formation below may be determined, which basin zone in which fractures are present may be determined based on the fracture configuration and the spatial distribution of the fold configuration of the basin cover layer in the hydrocarbon seepage zone.
As described above, in the subsequent process of determining the ore-forming zone, the reducing color sand body distribution area and the ore-controlling fracture structure distribution area need to be overlapped, that is, in the finally determined ore-forming zone, fracture structures are necessarily distributed near the reducing color sand body, for this reason, in some embodiments, a basin area where fracture structures communicating with the lower stratum exist can be determined first, and the reducing color sand body distribution area is further determined in the basin area, so that the workload is reduced, and the determination efficiency is improved.
In some embodiments, the oxide build sedimentary formations may be determined based specifically on formation evolution characteristics in the basin region, and the reduction color sand distribution regions may be determined based on borehole data of the oxide build sedimentary formations.
Specifically, the newly born zone structure evolution characteristics in the basin region can be systematically analyzed by utilizing a basin structure analysis technology, a basin structure-deposition evolution sequence is established, a basin sedimentation filling sequence and a structure lifting and denudation period are mastered, a horizon where the oxidation color building is located is determined, then, a stratum framework is established by utilizing a drilling well-connecting profile, lithologic combination characteristics and spatial distribution characteristics of each sedimentary stratum are mastered, and therefore the step of determining the reduction color sand body distribution region can be completed with high efficiency.
In some other embodiments, the skilled person can select other suitable ways to determine the distribution area of the reducing color sand, which is not limited in this respect.
In some embodiments, the determining the oil and gas diffusion zone in step S104 may specifically include: determining the distribution range of an oil-gas field and/or a coal field in an oil-gas seepage area; determining fracture configurations in a distribution range of an oil and gas field and/or a coal field; and determining the oil gas and/or coal bed gas escape area based on the position relation of the fracture structure and the oil gas field and/or the coal field, as well as the property, the formation time and the evolution period of the fracture structure so as to determine the oil gas escape area.
The formation of oil and gas fields needs to go through the processes of migration, aggregation, storage and the like, oil and gas generated by an oil-producing layer is transported to a reservoir layer, then the reservoir layer goes into a trap through transverse and longitudinal migration to form the oil and gas fields, after the oil and gas fields are formed, the oil and gas fields also need to go through the test of earth crust motion, the cover layer or the trap of some oil and gas fields is damaged, and the oil and gas is dissipated to the ground surface. On this basis, if a fracture structure which appears after the formation of the oil and gas field exists at the distribution range of the oil and gas field or the coal field, the fact that the cover layer or the trap at the position is damaged after the formation of the oil and gas field means that oil and gas can be scattered. For this reason, in this embodiment, the nature, formation time, evolution period, etc. of the fracture structure may be determined, so as to determine the fracture structures located in the cap layer and trap of the oil and gas field and appearing after the oil and gas field is formed, and the areas covered and extended by these fracture structures may be used as oil and gas escape areas.
As described above, the escaped hydrocarbons need to be transferred to the formation where the upper oxidation formation is located for a reduction reaction, and therefore, in some embodiments, when determining the oil and gas escaped region, one can focus on the fracture structures that communicate the oil and gas field with the formation where the upper oxidation formation is located, and perform further analysis on these fracture structures, thereby reducing the workload and improving the efficiency of the determination.
In some embodiments, a step of determining the presence of uranium sources in the field and/or coal in the hydrocarbon seepage zone may also be added. Although the escaped oil and gas and coal field gas usually contain uranium, if the uranium content in the oil and gas field and the coal field is too low, the formed uranium ore body may not have exploitation value, and therefore, the uranium content in the oil and gas field and the coal field can be detected to confirm whether the oil and gas field and the coal field contain enough uranium sources.
In some embodiments, after the reducing color sand distribution region is determined, a sand alteration zone may be further determined according to a spatial distribution characteristic of the reducing color sand in the reducing color sand distribution region, so that, after it is determined in step S108 that the uranium ore in the reducing color sand is formed by the effect of the effusion fluid, an ore formation zone may be determined in step S110 based on an overlapped area of the sand alteration zone, the oil and gas emission region, and the fracture formation distribution region.
It will be appreciated that the extent of exudation fluid action is more accurately reflected by the zone of sand alteration than by the zone of reduced colour sand distribution, and thus the use of the zone of sand alteration in place of the zone of reduced colour sand distribution further improves the accuracy of the identified mineralisation zone.
The method of one or more of the embodiments referred to above will be described and supplemented in greater detail below with reference to the prediction of sandstone uranium ore mineralization zones in the southwest oil and gas exudation zone of the urdos basin as an example.
First, data such as basic geology, mineral geology reports, figures and documents in southwest of the deltoid basin are collected comprehensively and systematically, wherein figures such as a structural outline, a geological profile, a seismic profile, a geophysical comprehensive profile and an oil-gas field distribution diagram of a research area are collected in an emphasized mode.
The deposition of new zone in the southwest part of the basin is compiled by using various section views and plan viewsConstructing a schematic diagram in the stratum, and primarily screening out the Luo river group (K) 1 l) and Huachi-Huahe group (K) 1 h) The main ore-seeking target layer is developed with oxidation color construction, and reduction color sand bodies are developed in the oxidation color construction.
And (4) carrying out sedimentation construction analysis aiming at the screened key ore-finding target layer Huachi-Hua river group and Luo river group. The method fully utilizes the drilling data of the underground mine, the petroleum and the coal field, compiles a longitudinal and transverse drilling well-connected profile map of the chalk system in the whole research area, establishes a stratum identification mark, and constructs a stratum framework when the chalk system is used. In the construction of the chalk-based oxidation color, gray green sand bodies, gray white sand bodies and other reduction color sand bodies with certain reduction capacity in a Huachi river-surrounding group and a Luo river group are defined in an important way. The layering positions respectively compile a reducing color sand body distribution diagram.
And then, fully utilizing a geological profile, a drilling well-connecting profile, an earthquake profile, a geophysical prospecting magnetic method and an electric method profile, and taking the Longxia county-national bay-plain-Pingyang-Pengyang-Heineberg line as a key research area to identify and divide the structure type and the structure pattern. The main body of the region is considered to be located on the slope of the inclined southwest wing structure in the sky ring direction through analysis, the local development is small and inclined, for example, the developing plum family river in the national bay-spirit region is inclined, and the developing forest family temple in the cool region is inclined. And developing a plurality of high-angle normal faults in the inclined inner part and the periphery, interpreting through a seismic profile, communicating a part of fractures with deep tri-fold hydrocarbon source rocks, extending upwards and diffracting into a plurality of small normal faults, communicating a key ore exploration target layer lohey group and a Huachi river-surrounding group, carrying out key identification and division on the faults, and determining the distribution area of the faults as an ore control fracture distribution area.
Further, the distribution characteristics of the oil and gas field and the coal field are ascertained. The method is characterized in that data of Changqing oil and gas fields and various coal mines in the southwest of the basin are fully arranged, hydrocarbon source rocks of the oil and gas are mainly distributed in a three-fold system extension group through inspection, coal mines are mainly distributed in a Jurassic system extension group, and oil and gas distribution maps and oil field distribution maps in the southwest of the basin are respectively compiled by analyzing the investigation working degree of the oil and gas fields and the coal fields.
And analyzing the distribution relation of the fracture structure and the oil and gas fields and the coal fields. And mastering the spatial distribution relationship between the southwest fracture structure of the basin and the oil and gas field and the coal field through the compiled fracture structure system diagram and the distribution diagram of the oil and gas field and the coal field. Screening the fractures of communicable deep oil and gas fields, coal fields and upper oxidized color debris deposition building layers in the lower chalky system pond-river loop group and the loving group, and analyzing the properties, the formation time and the evolution period of the fractures; analyzing and conjecturing the areas where the oil gas and the coal bed gas escape under the action of fracture communication, and finally determining the oil gas escape areas.
And then, analyzing the alteration characteristics of the ore-bearing sand body, and considering that the sand body of the ore-surrounding river group of the ore area is subjected to early oxidation, medium-term oxidation and reduction alteration alternation and later-term reduction alteration superposition to cause that lamellar, lenticular and lumpy maked mauve sand bodies are remained in the giant-thickness gray-green sand body.
The method is characterized in that a new Zhuang uranium ore production place in the southwest of the basin is taken as a research object, the source of uranium mineralization substances is determined, the uranium mineralization effect is analyzed, main quantity and micro-quantity analysis, sheet identification, scanning identification and inclusion test analysis are carried out on the uranium ore, a small amount of dark color flowing state organic matters exist in reduced color endowing ore sand bodies, the uranium ore mainly comprises uranite and bituminous uranium ore, minerals associated with the uranium ore mainly comprise chalcopyrite, pyrite, zinc blende, galena and the like, and the phenomena show that the reduced color endowing ore has the characteristics of deep reductive substance sources, but not surface water infiltration, namely the uranium mineralization and not interlayer oxidation but deep fluid seepage. Through the analysis, the uranium mineralization in the oil-gas seepage area in the southwest part of the basin is considered to mainly take the seepage fluid seepage function of the stratum where the oil-gas field and the coal field are located as the main factor.
And finally, various drawing pieces which are compiled are fully utilized, the fracture which is communicated with a deep oil-gas field and a coal field and is communicated with an upper chalk-based oxidation color building layer is determined as a key ore control fracture, the off-white sand bodies of the Huachi-Huachi group and the Luo-chi group are determined as the reducing color sand bodies of the key ore control, and the deep hydrocarbon source rock is determined as a main uranium source. And finally, superposing the oil gas dissipation area, the reduction color distribution area and the ore-control fracture structure distribution area, delineating 1I-level ore-forming zone of Huachi-Huahe group and 1 II-level ore-forming zone of Luhe group by comprehensively analyzing uranium ore-forming conditions and ore-forming effects, and finding out industrial uranium mineralization through drilling and verification.
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.
Claims (12)
1. A method for determining an ore-forming zone of sandstone uranium deposit in an oil-gas seepage zone comprises the following steps:
determining a reducing color sand body distribution area in the oil gas seepage area, wherein the reducing color sand body distribution area is an area of reducing color sand body distribution formed by alteration in the construction of oxidation colors;
determining an oil gas dissipation area in the oil gas seepage area, wherein the oil gas dissipation area is an area where oil gas and/or coal bed gas fluid in the oil gas seepage area are dissipated;
determining an ore-control fracture distribution area in the oil-gas seepage area, wherein the ore-control fracture distribution area is a fracture structure distribution area which communicates the stratum where the oil-gas field and/or the coal field in the oil-gas seepage area is located with the stratum where the oxidation color construction is located;
determining the cause of the uranium ore body in the reducing sand body;
and determining an ore formation zone of sandstone uranium ores in the oil and gas exudation zone, wherein if the uranium ore bodies in the reducing color sand bodies are determined to be formed under the action of exudation fluid, the ore formation zone is determined based on an overlapped area of the reducing color sand body distribution zone, the oil and gas exudation zone and the fracture structure distribution zone.
2. The method of claim 1, wherein the determining the cause of the uranium ore body in the reduced color sand body comprises:
determining the effect of uranium ore bodies in the reducing color sand bodies through a reducing fluid;
determining a source of the reducing fluid;
and determining that the uranium ore body in the reducing color sand body is formed through the action of the seepage fluid if the reducing fluid seeps out of the deep stratum where the oil and gas field and/or the coal field are located.
3. The method of claim 2, wherein the determining the effect of the uranium ore in the reducing color sand bodies on the reducing fluid comprises:
and determining the alteration characteristics of the reducing color sand body, and if layered, lenticular and/or lumpy oxidized color sand bodies remain in the reducing color sand body, determining the uranium ore body in the reducing color sand body to pass through the action of the reducing fluid.
4. The method of claim 2, wherein the determining a source of the reducing fluid comprises:
and determining the source of the reducing fluid based on the source of the organic matter in the reducing color sand body, wherein if the organic matter seeped out of the deep stratum of the oil and gas field and/or the coal field exists in the reducing color sand body, determining that the reducing fluid seeps out of the deep stratum of the oil and gas field and/or the coal field.
5. The method of claim 2, wherein the determining the source of the reducing fluid comprises:
determining a source of the reducing fluid based on the type of uranium ore bodies in the reducing color sand and the uranium ore body associated minerals, wherein if the type of uranium ore bodies in the reducing color sand includes uraninite and/or uraninite, and the associated minerals of the uranium ore bodies include at least one of chalcopyrite, pyrite, sphalerite, galena, it is determined that the reducing fluid is exuded from the formation in which the oil and gas field and/or coal field is located.
6. The method of claim 2, wherein the determining a source of the reducing fluid comprises:
determining a source of the reducing fluid based on the elemental content in the reducing color sand body.
7. The method of claim 1, wherein the determining a reduced color sand distribution zone in the hydrocarbon exudation zone comprises:
determining a basin area of the oil and gas seepage zone;
determining the oxidation color in the basin area to build a sedimentary formation;
and determining the reducing color sand body distribution area in the stratum of the oxidized color building sediment.
8. The method of claim 7, wherein the determining the basin region of the hydrocarbon seepage zone comprises:
determining a basin region with a fracture structure of the stratum below the communication, wherein the basin region with the fracture structure of the stratum below the communication is determined based on the fracture structure of the basin cover layer in the oil and gas seepage zone and the spatial distribution of the fold structure.
9. The method of claim 7 or 8, wherein the oxide color build sedimentary formations are determined based on formation evolution characteristics in the basin area and the reducing color sand distribution zones are determined based on borehole data of the oxide color build sedimentary formations.
10. The method of claim 1 wherein said determining a hydrocarbon spill zone in said hydrocarbon spill zone comprises:
determining the distribution range of oil and gas fields and/or coal fields in the oil and gas seepage zone;
determining fracture configurations in a distribution range of the oil and gas field and/or the coal field;
and determining an oil gas and/or coal bed gas escape area based on the position relation of the fracture structure and the oil gas field and/or the coal bed field, and the property, the formation time and the evolution period of the fracture structure so as to determine the oil gas escape area.
11. The method of claim 1, further comprising:
determining the presence of a uranium source in a field of oil and gas and/or a coal field in the oil and gas seepage zone.
12. The method of claim 1, further comprising:
determining a sand alteration zone, wherein the sand alteration zone is determined based on the spatial distribution characteristics of the reducing color sand in the reducing color sand distribution area;
the determining an ore-forming zone of the sandstone uranium deposit in the oil and gas seepage zone comprises:
and if the uranium ore body in the reducing sand body is formed under the action of deep seepage fluid, determining the ore forming zone based on the superposed area of the sand body alteration zone, the oil-gas escape zone and the fracture structure distribution zone.
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