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

Active Publication Date: 2019-05-07
BEIJING RES INST OF URANIUM GEOLOGY
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  • Claims
  • Application Information

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Problems solved by technology

Traditional structural and thermal evolution history, source rock hydrocarbon generation and expulsion history, inclusion uniform temperature-stratum burial history method, authigenic illite K-Ar method and other qualitative and quantitative geological analysis methods are not suitable for determining the oil and gas in ore-bearing target layers. charging time

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

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Embodiment Construction

[0031] The present invention will be described in further detail below in conjunction with accompanying drawings and examples.

[0032] Since the depth of the sandstone-type uranium ore prospecting target layer is more than 500m at present, the "shallow layer" in this patent is defined as the range shallower than 500m underground.

[0033] Such as figure 1 As shown, the present invention provides a method for determining the oil and gas charging time series of shallow ore-bearing formations at the basin margin. The method includes the following steps:

[0034] Step (1) Determine the working area and the target layer, and determine the stratum age range of the target layer as t 0 —t 0 ';Specific steps are as follows:

[0035] Step (1.1) circle the working area on the uranium ore geological map of appropriate scale;

[0036] The scale is 1:50,000-1:500,000. For example, choose the 1:200,000 geological map of uranium deposits in the Junggar Basin, and capture the northwest m...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/40G01V1/30G01N23/00
Inventor 黄少华秦明宽丁波东艳何中波刘章月
Owner BEIJING RES INST OF URANIUM GEOLOGY
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