A method for judging sedimentary environment based on element xrf method in sandstone
A technology of sandstone, elements, applied in the direction of instruments, measuring devices, scientific instruments, etc.
Inactive Publication Date: 2020-01-31
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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Problems solved by technology
Since conventional XRF analysis cannot fully meet the requirements of quantitative and high-resolution analysis, the XRF core scanning analysis method has been gradually developed.
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[0031] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.
[0032] The study area is located in the northeast of the Xihu sag. Through core observation, the study area mainly develops a large set of thick sandstone reservoirs. Due to the small number of wells drilled in the study area, different scholars have different views on the types of sedimentary facies in the study area. There are two main views: braided river sedimentary facies and braided river delta sedimentary facies. By adopting the method of the present invention, the element density test is carried out on the core of the target layer in the research area, and the sedimentary environment of the target layer in the research area is obtained, which provides a basis for distinguis...
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The invention discloses a method for judging sedimentary environment based on a sandstone element XRF method. The method comprises the following steps: 1) testing a core of sandstone through an X-ray spectrometer, and acquiring data of percentage content of all elements in the core; 2) performing relation analysis to the GR value of cores of sandstone obtained by measuring every element and oilfield drilling, finding out the element having good relation to GR value, and the corresponding relation formula; 3) according to the relation obtained in the step 2), standardizing the percentage content of each element with the corresponding GR value, and eliminating the influence of mud amount to the percentage content of the element; and 4) judging the change indicating the sedimentary environment by utilizing the standardized characteristic element and the ratio of the characteristic elements. By utilizing the method, the influence of the percentage content of mud in different deposited microfacies sandstone reservoirs can be eliminated, so that the palaeosedimentary environment can be judged by utilizing elements in the sandstone.
Description
technical field [0001] The invention relates to the fields of geochemistry and sedimentology, and uses an XRF method to discriminate the sedimentary environment. Background technique [0002] Trace elements in sedimentary rocks are closely related to their formation environment. During the deposition process, there is a complex geochemical balance between the sediment and the water medium, such as the adsorption of certain elements by the sediment and the exchange of elements between the sediment and the water medium. This adsorption and exchange is not only related to the properties of the elements themselves, but also affected by the physical and chemical conditions of the sedimentary medium. Water media in different depositional environments have different physical and chemical conditions, and the laws of dispersion and aggregation of elements are also different. It provides a theoretical basis for the use of sediment trace elements for paleoenvironmental analysis. By s...
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IPC IPC(8): G01N23/223
CPCG01N23/223
Inventor 赵仲祥董春梅林承焰阮建新段冬平陆嫣刘英辉张宪国于申孙小龙林建力
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)