Method for determining time series of oil and gas charging in ore-bearing formations of shallow layer of basin margin

A time series, oil and gas technology, applied in the direction of seismology, measuring devices, instruments, etc. for well logging records, can solve problems such as inappropriate oil and gas charging time
CN109725355AActive Publication Date: 2019-05-07BEIJING RES INST OF URANIUM GEOLOGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BEIJING RES INST OF URANIUM GEOLOGY
Publication Date
2019-05-07

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Abstract

The invention belongs to the technical field of a sandstone-type uranium deposit in a basin, and specifically discloses a method for determining a time series of oil and gas charging in ore-bearing formations of a shallow layer of a basin margin. The method comprises the following steps: (1) determining a working area and a target layer, and determining the target layer geologic age range is t0-t0'; (2) performing a sample collection in a circled work area; (3) selecting apatite and extracting a chloroform pitch A from the collected samples; (4) performing a inversion of a history of structural evolution and an oil source analysis on the sample, and screening a sample having a common single source; (5) performing the organic matter Re-Os dating of the chloroform pitch A on the homologous and single source sample, comparing an obtained age data tn with the age t0 of the formation target layer, and retaining the age of tn<=t0; and obtaining the oil and gas charging time (t) order according to whether the retention age is in a strong tectonic activity period. The method can accurately identify the period and time of the oil and gas charging in a prospecting target layer of a shallow layer of a petroliferous basin margin.
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Description

technical field

[0001] The invention belongs to the technical field of sandstone-type uranium deposits in basins, and in particular relates to a method for measuring oil and gas charging time series of basin margin shallow ore-bearing formations. Background technique

[0002] Sandstone-type uranium deposits produced in oil-gas basins have a close relationship of origin and spatial distribution with oil-gas fluids. However, different stages of hydrocarbon fluid charging have positive, negative and complicated effects on uranium mineralization. Oil and gas intrusion before ore-forming can increase the reduction capacity of sandstone in the target layer; oil-gas emplacement during ore-forming can directly participate in the precipitation and enrichment of uranium; oil-gas charging after ore-forming will secondary reduction reformation of epigenetic oxidized sandstone, The oxidation-reduction interface is unclear, which plays a complex role in preserving and covering the ore bo...

Claims

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