Analysis method for rock sample lithology denomination based on X-ray element fluorescence
A rock sample and X-ray technology, which is applied in the analysis field of rock sample lithology naming based on X-ray elemental fluorescence, can solve the problems of low dimensional utilization, unsuitable high-dimensional element analysis, and difficult to accurately establish templates, and achieves a high level of improvement. Accuracy, Ease of Promotion and Application
Active Publication Date: 2014-11-26
天津陆海石油设备系统工程有限责任公司
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Problems solved by technology
These methods use few types of elements and low dimensional utilization, so they are not suitable for high-dimensional element analysis; and template builders need a certain theoretical foundation and practical experience, and it is difficult to accurately create templates
Therefore, the current analysis methods are not suitable for high-dimensional elemental analysis of complex formations
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[0015] 1. Establish a template database: First, summarize the element contents of andesite, lamprophyre, and basaltic mudstone in the same area and store them in the template database; see Table 1 and Table 2 for the element content data of andesite, lamprophyre, and basaltic mudstone and Table 3 (due to space limitations, this table only lists 8 elements and 5 pieces of data).
[0016] Table 1 Andesite data
[0017]
[0018] Table 2 lamprophyre data
[0019]
[0020] Table 3 Basaltic mudstone data
[0021]
[0022] 2. Establish a template: Through observation, six main elements, Al, Si, K, Ca, Ti, and Fe, are selected as the analysis elements. According to the selected analysis elements, the expected value and standard deviation of each element of andesite, lamprophyre, and basaltic mudstone are obtained through the template database, as shown in Table 4, Table 5, and Table 6, and saved to the template file.
[0023] Table 4 andesite template
[0024]
[0025]...
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The invention relates to an analysis method for rock sample lithology denomination based on X-ray element fluorescence. The lithology of an unknown rock sample is analyzed and denominated by using an X-ray fluorescence spectrometer. The analysis method comprises the following steps of: firstly, determining element types used when various lithologies are analyzed, and then, storing element content data of measured known-lithology rock samples in the region into a template database; automatically identifying the expected value and the standard difference of normal distribution of elements by software according to the used element types and template database; calculating the probability value of the lithology of the sample according to the sample element content, the expected value and the standard difference; and finally, taking the name of the lithology with the highest probability value as the name of the lithology of the rock sample. By using the method, the accuracy in denomination of the lithology is improved in analysis of high-dimensional elements in on-site logging of a complex strata of an oil field through carrying out statistics, classification and analysis on the known lithology and then establishing a template; and the implementation of the method has no rigorous requirement for personnel for establishing the template, so the method is conveniently popularized and applied to on-site logging operation of the oil field.
Description
technical field [0001] The invention relates to a method for lithology naming of rock samples at an oil field site, in particular to an analysis method for lithology naming of rock samples based on X-ray element fluorescence. Background technique [0002] The lithology naming of rock samples in the oil field needs to detect and record the element content of the rock samples, and judge the lithology naming through corresponding interpretation and analysis methods. At present, the elemental analysis methods used by various oilfield logging companies include curve intersection method, chart analysis method and so on. These methods use few types of elements and low dimensional utilization, so they are not suitable for high-dimensional element analysis; moreover, template builders need a certain theoretical foundation and practical experience, and it is difficult to accurately create templates. Therefore, the current analysis methods are not suitable for high-dimensional element...
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IPC IPC(8): G01N23/223
Inventor 董灵彦王超阎治全杨涛李栋巍刘青元欐何小播李同攀
Owner 天津陆海石油设备系统工程有限责任公司