CN116381794A - Method for delineating sandstone-type uranium deposit beneficial zone by utilizing oil and gas transportation and aggregation rule - Google Patents
Method for delineating sandstone-type uranium deposit beneficial zone by utilizing oil and gas transportation and aggregation rule Download PDFInfo
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Abstract
The invention relates to a method for delineating a sandstone uranium deposit beneficial region by utilizing an oil-gas transportation aggregation rule, which comprises the following steps: collecting geological data of a research area, and determining a sandstone-type uranium deposit target layer, an oil and gas source rock layer and a reservoir; developing sandstone-type uranium deposit target horizon structure interpretation and sketching a structure chart according to the three-dimensional seismic data and the drilling data; carrying out sandstone uranium mine target horizon river channel sand prediction work, defining the spatial spreading of the river channel sand, and compiling a river channel sand distribution map; dividing an oil gas transmission fault according to a construction interpretation result; identifying the oil and gas trap according to the construction interpretation result and the sand body prediction result; and delineating a sandstone-type uranium deposit distribution favorable region according to the distribution of sand bodies, oil gas transmission and conduction faults and oil gas trapping. Under the macroscopic background of uranium deposit development, the method indirectly determines the beneficial areas of uranium deposit enrichment by searching the beneficial areas of oil and gas aggregation, has strong feasibility and good application effect, and is particularly suitable for exploration research of sandstone-type uranium deposit in oil-bearing gas basin.
Description
Technical Field
The invention relates to a method for predicting a favorable region in the field of oil-gas basin sandstone-type uranium deposit exploration, in particular to a method for delineating the favorable region of sandstone-type uranium deposit by utilizing an oil-gas transportation aggregation rule.
Background
Uranium is a strategic clean, low-carbon nuclear energy source, and is an important guarantee for realizing the worldwide sustainable development target 7 of energy, namely economic and applicable clean energy (SDG 7). Sandstone-type uranium deposit refers to a uranium deposit produced after exogenous production in clastic rock such as sandstone, conglomerate, or the like. As the type with the highest scale among all uranium ores, its resource amount is 25% of the world and 62% of china. The uranium ore of the type has the advantages of environmental protection, shallow burial, large reserve scale, low exploitation cost and the like, can be widely developed in oil-gas-containing basins in north of China, and shows great exploration prospect.
The former carries out systematic research from a plurality of aspects such as construction background, mineral alteration, localization index, fluid source, ore formation period, reservoir characteristics, fracture characteristics and the like, effectively guides geological prospecting and ore formation rule analysis of sandstone-type uranium ores under various complex conditions, and indicates that the inner structure and deposition of the uranium reservoir have important restriction effects on the development of interlayer oxidation zones, such as Cao Minjiang, published in the earth science 2021; in 2017 of geological prospecting forum, a research on the ore-forming relation between sedimentary basin oil gas and sandstone-type uranium ores of superclass is disclosed, and indicates that the sedimentary basin oil gas is taken as a reducing fluid, hexavalent uranium ions in stratum water can be reduced into tetravalent uranium ions to be separated out into ores, and is an important factor for enrichment of the sandstone-type uranium ores of the oil-containing gas basin; the Chinese patent application with the application number of 202210817549.4 discloses a sandstone type uranium mine exploration well site deployment method based on three-dimensional seismic comprehensive interpretation, wherein the well site is optimized and deployed by utilizing seismic data to determine stratum and fracture distribution; the invention discloses a sandstone-type uranium deposit controlled ore fracture identification method and a sandstone-type uranium deposit controlled ore fracture identification system based on three-dimensional seismic data, which are disclosed in Chinese patent application ZL202210078352.3, wherein a fracture system is finely identified and divided to determine an ore beneficial region; the invention patent ZL 201710778813.7 discloses a comprehensive earthquake prediction method for sandstone-type uranium ores, which predicts the distribution of sandstone-type uranium ores reservoirs by using inversion technology and attribute analysis technology. However, for oil-gas-containing basins, oil gas plays an important role as a reducing fluid in the uranium mineralization process, the sandstone-type uranium deposit enrichment rule under the influence of the oil gas is still to be studied in depth, and a method for delineating a sandstone-type uranium deposit beneficial region by utilizing the oil gas transportation aggregation rule is still to be established.
Disclosure of Invention
The invention aims to provide a method for delineating a sandstone-type uranium deposit beneficial region by utilizing a gas-oil aggregation rule, which is used for forecasting the sandstone-type uranium deposit beneficial region of a hydrocarbon-bearing basin.
The technical scheme adopted for solving the technical problems is as follows: the method for delineating the sandstone-type uranium deposit beneficial region by utilizing the oil and gas aggregation rule comprises the following steps:
step one: collecting geological data of a research area, and determining a sandstone-type uranium deposit target layer, an oil and gas source rock layer and a reservoir;
step two: developing sandstone-type uranium deposit target horizon structure interpretation and sketching a structure chart according to the three-dimensional seismic data and the drilling data;
step three: carrying out sandstone uranium mine target horizon river channel sand prediction work, defining the spatial spreading of the river channel sand, and compiling a river channel sand distribution map;
step four: dividing an oil gas transmission fault according to a construction interpretation result;
step five: identifying the oil and gas trap according to the construction interpretation result and the sand body prediction result;
step six: and delineating a sandstone-type uranium deposit distribution favorable region according to the distribution of sand bodies, oil gas transmission and conduction faults and oil gas trapping.
In the first scheme, the sandstone-type uranium deposit target layer is identified and judged through the resistivity curve and the radioactivity curve of the existing drilling holes in the research area or the adjacent area, and the sandstone-type uranium deposit is expressed as a relatively high value on the resistivity curve and is higher than half of the resistivity value domain range; sandstone-type uranium ores exhibit abnormally high values on the radioactivity curve, greater than 300API.
The target horizon construction interpretation method in the scheme step II is as follows: carrying out fine calibration on the three-dimensional seismic data by using the drilling holes, and determining the seismic reflection characteristics of the sandstone uranium ore target horizon, wherein the seismic reflection characteristics comprise the amplitude intensity, the frequency change and the continuity characteristics of a seismic homophase axis, and carrying out three-dimensional tracking interpretation on the horizon according to the seismic reflection characteristics; and simultaneously, carrying out three-dimensional tracking interpretation on the fault according to the characteristic of the fault that the section in the seismic data is broken or distorted on the same axis and the attribute discontinuity of the plane.
In the step three of the scheme, the method for predicting the sandstone type uranium deposit target horizon river channel sand comprises the following steps: and extracting the seismic attributes by utilizing the seismic data, wherein the extracted seismic attributes comprise amplitudes, calibrating the seismic amplitudes by combining the river sandstone distribution revealed by the drilling data, and realizing the identification and prediction of the river sandstone.
The method for dividing the oil gas transmission and conduction fault in the fourth scheme comprises the following steps: in the three-dimensional seismic data, identifying that faults of a cut-through uranium deposit target layer and an oil gas source rock layer or a reservoir layer are oil gas transmission and guide faults, wherein the oil gas transmission and guide faults are transmission and guide channels for upward migration of deep oil gas, and reducing fluid is provided for sandstone type uranium deposit.
The method for identifying the closed state of the oil and gas ring in the fifth scheme comprises the following steps: overlapping a structural diagram of sandstone uranium ores with a river sand body distribution diagram, and searching a region surrounded by stratum, fault or sand body in the overlapping diagram to obtain the oil gas trap.
The method for defining the beneficial regions of sandstone-type uranium deposit distribution in the step six of the scheme comprises the following steps: meanwhile, the positions with river channel sand bodies, oil gas transmission and conduction faults and oil gas trapping are favorable areas for sandstone-type uranium deposit distribution.
Advantageous effects
1. According to the invention, oil gas is considered as a reducing fluid to play an important role in sandstone uranium deposit, and under the macroscopic background of uranium deposit development, the beneficial region of uranium deposit enrichment is indirectly determined by searching the beneficial region of oil gas aggregation, so that the theoretical basis is full, the application effect is good, the exploration potential is clarified, and the drilling success rate can be improved.
2. The method comprises the steps of firstly, locking a target horizon by using known drilling information, so that the target horizon necessarily has macroscopic beneficial factors of sandstone-type uranium ore mineralization; on the basis, performing construction explanation and sand prediction on the target horizon by utilizing three-dimensional seismic data to obtain a construction diagram and a sand distribution diagram; finally, according to the distribution of three main control factors of sand bodies, transmission faults and oil and gas trapping, the method combines the oil and gas transportation and accumulation rules to realize the prediction of the favorable region of the sandstone-type uranium deposit. The method is high in feasibility and is particularly suitable for exploration and research of sandstone-type uranium ores in oil-gas bearing basin.
Drawings
FIG. 1 is a diagram of known borehole uranium-bearing target horizon identification according to an embodiment of the present invention;
FIG. 2 is a three-dimensional seismic data interpretation of an embodiment of the invention;
FIG. 3 is a top view of a target horizon according to one embodiment of the invention;
FIG. 4 is a target horizon river course sand profile of an embodiment of the present invention;
FIG. 5 is a schematic diagram of a hydrocarbon transportation and uranium mining mode in accordance with an embodiment of the present invention;
FIG. 6 is a diagram of hydrocarbon trap identification in accordance with an embodiment of the present invention.
Detailed Description
The method for delineating the beneficial zone of the sandstone-type uranium deposit by utilizing the gas-oil aggregation rule comprises the following steps:
step one: collecting regional geological data, and defining a sandstone type uranium deposit target layer, an oil and gas source rock layer and a reservoir; the sandstone-type uranium deposit target layer is identified and judged through the resistivity curve and the radioactivity curve of the existing drilling holes in the research area or the adjacent area, and the sandstone-type uranium deposit is expressed as a relatively high value on the resistivity curve and is generally higher than half of the resistivity value domain range; exhibits abnormally high values on the radioactivity curve, typically greater than 300API. The oil gas source rock stratum and the reservoir stratum are obtained through previous research results, and can be obtained through reference to literature materials because the previous people in the oil gas containing basin have full knowledge of the oil gas source rock stratum and the reservoir stratum.
Step two: developing target horizon structure interpretation and drawing a structure diagram according to the three-dimensional seismic data and the drilling data; the method comprises the steps of carrying out fine calibration on three-dimensional seismic data by using a drilling hole, determining the seismic reflection characteristics of a target horizon, wherein the seismic reflection characteristics comprise the amplitude intensity, the frequency change and the continuity characteristics of a seismic homophase axis, and carrying out three-dimensional tracking interpretation on the horizon according to the seismic reflection characteristics; and simultaneously, carrying out three-dimensional tracking interpretation on the fault according to the characteristics of fault in-phase axis dislocation or distortion, plane attribute discontinuity and the like of the fault in the seismic data.
Step three: developing target horizon river sand prediction work, defining the spatial distribution of river sand, and compiling a river sand distribution map; the target horizon river sand prediction method utilizes seismic data to extract seismic attributes such as amplitude and the like, combines the river sand distribution revealed by drilling data to calibrate the attributes such as the seismic amplitude and the like, and generally has larger thickness of the river sand and is characterized by strong amplitude, thereby realizing the recognition and prediction of the river sand.
Step four: dividing an oil gas transmission fault according to a construction interpretation result; the method for dividing the oil gas transmission fault is characterized in that faults penetrating through the uranium deposit target layer and the oil gas source rock layer or the reservoir layer are identified in the three-dimensional seismic data to be the oil gas transmission fault, and the faults can be used as transmission channels for upward migration of deep oil gas to provide reducing fluid for the uranium deposit target layer.
Step five: identifying the oil and gas trap according to the construction interpretation result and the sand body prediction result; the oil and gas trap identification method is characterized in that a structural diagram of a target layer is overlapped with a river channel sand body distribution diagram, and an area surrounded by stratum, fault or sand body is found in the overlapped diagram to be the oil and gas trap.
Step six: and delineating a sandstone-type uranium deposit distribution favorable region according to the distribution of sand bodies, oil gas transmission and conduction faults and oil gas trapping. The method for delineating the favorable region of sandstone-type uranium deposit distribution meets the requirements of positions with river channel sand bodies, oil gas transmission and conduction faults and oil gas delineating, namely the favorable region of sandstone-type uranium deposit distribution. The river channel sand body is a good reservoir, the transportation and conduction fault provides oil gas sources, and the trap provides space for oil gas accumulation, so that the positions of the river channel sand body, the transportation and conduction fault and the trap are favorable areas for oil gas accumulation; the oil gas is taken as an indispensable condition for the ore formation of sandstone-type uranium ores, and the favorable region for the accumulation of the oil gas is also a favorable region for the distribution of the sandstone-type uranium ores. The hydrocarbon may be progressively lost in the later lengthy geologic months, but the already precipitated uranium ore may be preserved to date only under stable redox conditions.
Examples
The method for delineating the sandstone-type uranium deposit beneficial region by utilizing the oil and gas aggregation rule comprises the following steps:
step one: and collecting regional geological data, and definitely defining a sandstone-type uranium deposit target layer, an oil and gas source rock layer and a reservoir. The embodiment is a southern area of Daqing of Songliao basin, and according to the existing data, the shallow oil gas source rock layer of the research area can be definitely tender two-section mudstone, and the oil gas reservoir layer is tender three-four-section sandstone. As shown in FIG. 1, according to the existing drilling data, the resistivity curve of the four square groups at shallower positions is high, which indicates that sandstone is developing, and the natural gamma curve is abnormally high, which indicates that radioactivity abnormality exists. Two curves reveal that the tetragonal plateau group one-section development high-grade sandstone type uranium deposit is a uranium deposit target layer.
Step two: and carrying out target horizon structure interpretation and construction drawing according to the three-dimensional seismic data and the drilling data. As shown in fig. 2, the seismic data and the borehole data are loaded into professional seismic interpretation software, the seismic interpretation software comprises geoeast, landmark, fastgrid and the like, the three-dimensional seismic data is finely calibrated through the borehole, the seismic reflection characteristics of the target horizon are defined, the seismic reflection characteristics comprise the amplitude intensity, the frequency variation and the continuity characteristics of the same earthquake axis, and the horizons are subjected to three-dimensional tracking interpretation according to the seismic reflection characteristics; and simultaneously, carrying out three-dimensional tracking interpretation on the fault according to the characteristics of fault in-phase axis dislocation or distortion, plane attribute discontinuity and the like of the fault in the seismic data. The interpretation result is then processed and plotted into a construction diagram, as shown in fig. 3.
Step three: and (3) carrying out target horizon river sand prediction work, defining the spatial distribution of the river sand, and compiling a river sand distribution map. The seismic data are utilized to extract the root mean square amplitude attribute of the target horizon in the embodiment, the amplitude attribute is calibrated in combination with the river sandstone distribution revealed by the drilling data, the fact that the river sandstone thickness is large and the characteristic of strong amplitude is shown is clear, and therefore the recognition and prediction of the river sandstone are achieved, and if the characteristic is shown as 4.
Step four: and dividing the oil gas transmission and conduction fault according to the construction interpretation result. As shown in fig. 2, the present embodiment develops a plurality of faults, and faults penetrating through the target layer (one section of the tetragonal group) and the hydrocarbon reservoir layer (tender three four sections) or the source rock layer (tender one-two sections) are hydrocarbon-transporting faults. As shown in fig. 5, the oil gas generated by the tender first-second hydrocarbon source rock of the embodiment enters the tender third-fourth reservoir after primary migration, and then enters the bottom of the tetragonal group after secondary migration through the conducting fault, so that uranium ore formation provides the reducing agent.
Step five: and identifying the oil and gas trap according to the construction interpretation result and the sand body prediction result. The structural diagram of the target layer (one section of the square platform group) in this embodiment is overlapped with the river sand body distribution diagram, as shown in fig. 6, and the area surrounded by the stratum, the fault or the sand body is found in the overlapped diagram, namely the oil gas trap.
Step six: and delineating a sandstone-type uranium deposit distribution favorable region according to the distribution of sand bodies, oil gas transmission and conduction faults and oil gas trapping. And meanwhile, positions with river channel sand bodies, oil gas transmission and conduction faults and oil gas trapping are favorable regions for sandstone-type uranium deposit distribution. As shown in fig. 6, the traps found in this embodiment are all adjacent to the conducting fault, and thus are all beneficial regions of uranium deposit distribution.
In the embodiment, the ore-forming process of sandstone-type uranium ores is shown in fig. 5, and oil gas is upwards transported to the bottom of the tetragonal set through a conducting fault and is gathered in the trap. On the other hand, the groundwater carrying hexavalent uranium ions flows along the river channel sand body at the bottom of the tetragonal block under the barrier of the tender five-section mudstone. When flowing through the transmission and conduction fault and the oil and gas reservoir, hexavalent uranium ions are reduced by the oil and gas and are precipitated and enriched in sandstone pores. In the later stage, due to poor capping capability of the trap, oil gas gradually dissipates, the redox environment is unchanged, and the precipitated uranium ores are preserved in the trap until now.
Claims (7)
1. A method for delineating a sandstone-type uranium deposit advantageous region by using a hydrocarbon gas transport and accumulation law, which is characterized by comprising the following steps:
step one: collecting geological data of a research area, and determining a sandstone-type uranium deposit target layer, an oil and gas source rock layer and a reservoir;
step two: developing sandstone-type uranium deposit target horizon structure interpretation and sketching a structure chart according to the three-dimensional seismic data and the drilling data;
step three: carrying out sandstone uranium mine target horizon river channel sand prediction work, defining the spatial spreading of the river channel sand, and compiling a river channel sand distribution map;
step four: dividing an oil gas transmission fault according to a construction interpretation result;
step five: identifying the oil and gas trap according to the construction interpretation result and the sand body prediction result;
step six: and delineating a sandstone-type uranium deposit distribution favorable region according to the distribution of sand bodies, oil gas transmission and conduction faults and oil gas trapping.
2. The method for delineating a sandstone-type uranium deposit vantage point using a hydrocarbon transport law as claimed in claim 1, wherein: in the first step, the sandstone-type uranium deposit target layer is identified and judged through a resistivity curve and a radioactive curve of the existing drilling holes in a research area or a neighboring area, and the sandstone-type uranium deposit is represented as a relatively high value on the resistivity curve and is higher than half of the resistivity value domain range; sandstone-type uranium ores exhibit abnormally high values on the radioactivity curve, greater than 300API.
3. The method of delineating a sandstone-type uranium deposit vantage point using a hydrocarbon-based aggregation law as claimed in claim 2, wherein: the target horizon structure interpretation method in the second step is as follows: carrying out fine calibration on the three-dimensional seismic data by using the drilling holes, and determining the seismic reflection characteristics of the sandstone uranium ore target horizon, wherein the seismic reflection characteristics comprise the amplitude intensity, the frequency change and the continuity characteristics of a seismic homophase axis, and carrying out three-dimensional tracking interpretation on the horizon according to the seismic reflection characteristics; and simultaneously, carrying out three-dimensional tracking interpretation on the fault according to the characteristic of the fault that the section in the seismic data is broken or distorted on the same axis and the attribute discontinuity of the plane.
4. A method of delineating a sandstone-type uranium deposit vantage point using a hydrocarbon-based aggregation law as claimed in claim 3, wherein: the sandstone type uranium deposit target horizon river channel sand prediction method in the third step comprises the following steps: and extracting the seismic attributes by utilizing the seismic data, wherein the extracted seismic attributes comprise amplitudes, calibrating the seismic amplitudes by combining the river sandstone distribution revealed by the drilling data, and realizing the identification and prediction of the river sandstone.
5. The method for delineating a sandstone-type uranium deposit vantage point using a hydrocarbon transport law as claimed in claim 4, wherein: the method for dividing the oil gas transmission and conduction fault in the fourth step comprises the following steps: in the three-dimensional seismic data, identifying that faults of a cut-through uranium deposit target layer and an oil gas source rock layer or a reservoir layer are oil gas transmission and guide faults, wherein the oil gas transmission and guide faults are transmission and guide channels for upward migration of deep oil gas, and reducing fluid is provided for sandstone type uranium deposit.
6. The method for delineating a sandstone-type uranium deposit vantage point using a hydrocarbon transport law as claimed in claim 5, wherein: the hydrocarbon ring closing recognition method in the fifth step comprises the following steps: overlapping a structural diagram of sandstone uranium ores with a river sand body distribution diagram, and searching a region surrounded by stratum, fault or sand body in the overlapping diagram to obtain the oil gas trap.
7. The method of delineating a sandstone-type uranium deposit vantage point using a hydrocarbon-based aggregation law as claimed in claim 6, wherein: the method for defining the sandstone-type uranium deposit distribution beneficial region in the step six comprises the following steps: meanwhile, the positions with river channel sand bodies, oil gas transmission and conduction faults and oil gas trapping are favorable areas for sandstone-type uranium deposit distribution.
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Cited By (3)
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| CN117328860A (en) * | 2023-08-30 | 2024-01-02 | 核工业二0三研究所 | Positioning method for grey uranium-rich reduced geologic body in red clastic rock construction |
| CN117826257A (en) * | 2023-12-28 | 2024-04-05 | 西南石油大学 | Three-dimensional characterization method of oil-gas secondary migration channel |
| CN117950053A (en) * | 2024-03-25 | 2024-04-30 | 东北石油大学三亚海洋油气研究院 | Method for identifying fault shadows in seismic data by using average speed |
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| CN117950053A (en) * | 2024-03-25 | 2024-04-30 | 东北石油大学三亚海洋油气研究院 | Method for identifying fault shadows in seismic data by using average speed |
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