Sedimentary basin oil and gas strong reduction action zone sandstone type uranium deposit prospecting model establishing method

A model establishment and action zone technology, applied in the field of uranium ore exploration, can solve problems such as failure of the sandstone-type uranium ore prospecting model, increase the difficulty of ore prospecting, and inability to identify the interlayer oxidation zone, and achieve the effect of improving efficiency and improving work efficiency.

Active Publication Date: 2016-12-28
BEIJING RES INST OF URANIUM GEOLOGY
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Problems solved by technology

However, after the strong oil and gas reduction, the yellow sandstone in the interlayer oxidation zone turns into gray-black, and the geochemical conditions change from oxidizing conditions to reducing conditions, which makes it impossible to identify the interlayer oxidation zone, so that it is difficult to find the sandstone type by finding the interlayer oxidation zone. The model of uranium deposits is invalid, and the prospecting target cannot be effectively determined, which greatly increases the difficulty of prospecting. Therefore, the establishment of a prospecting model for sandstone-type uranium deposits in areas of strong oil and gas reduction in sedimentary basins is extremely necessary

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  • Sedimentary basin oil and gas strong reduction action zone sandstone type uranium deposit prospecting model establishing method

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Embodiment 1

[0114] According to field outcrop surveys and geological data, the Jurassic in the northwestern margin of the Junggar Basin was originally a gray layer, rich in carbon debris, plant debris, and rich in coal seams; a set of primary rocks about 20m thick developed in the middle of the a subgroup of the Tugulu Group in the Lower Cretaceous It is a gray sandy conglomerate layer, rich in carbon chips and plant debris in the sandy gravel. Therefore, the target layer in the northwest margin of the Junggar Basin is the gray glutenite layer in the middle of subgroup a of the Tugulu Group in the Jurassic and Lower Cretaceous systems.

[0115] Step 2: Delineate the distribution range of oil and gas reduction

[0116] Digitize the 1:200,000 regional geological map of the northwestern margin of the Junggar Basin. The field geological survey data, the collected drilling data, and the distribution data of oil and gas reservoirs were digitized on the 1:200,000 geological map of the northwest...

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Abstract

The invention belongs to the technical field of uranium deposit prospecting, and provides a sedimentary basin oil and gas strong reduction action zone sandstone type uranium deposit prospecting model establishing method which fully integrates the oil and gas reduction action, interlayer oxidation, the plane of unconformity, fracturing, sand bodies and other geological actions and geological units, discloses all the geological actions and the relationship thereof and determines a prospecting target for the sedimentary basin oil and gas strong reduction action zone. The method comprises the following steps that step one, a target layer is determined; step two, the oil and gas reduction action distribution range is delimitated; step three, time of the plane of unconformity is determined; step four, time Th of the oil and gas reduction action is determined; step five, the uranium mineralization type is determined; and step six, the prospecting model is established.

Description

technical field [0001] The invention belongs to the technical field of uranium ore exploration, and in particular relates to a method for establishing a sandstone-type uranium ore prospecting model in an oil-gas strong reduction zone in a sedimentary basin. Background technique [0002] In the strong oil and gas reduction area of ​​sedimentary basin, the strong oil and gas reduction is manifested by the sandstone color is gray-black, and the sandstone is filled with petroleum substances, which can smell obvious "petroleum smell". The geochemical conditions are reduction conditions, Fe3+ / Fe2+<1 . The most important prospecting sign for sandstone-type uranium deposits in sedimentary basins is the interlayer oxidation zone (sandstone is yellow in color, the geochemical conditions are oxidation conditions, Fe3+ / Fe2+>1), the larger the scale of the interlayer oxidation zone, the greater the sandstone-type uranium deposit The larger the scale. However, after the strong oil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V11/00
Inventor 许强李娟
Owner BEIJING RES INST OF URANIUM GEOLOGY
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