Method for analyzing x-ray fluorescence shale content in petroleum well drilling

A technique for shale content and fluorescence analysis, applied in the direction of material analysis using wave/particle radiation, analyzing materials, measuring devices, etc., to achieve representative and convincing results

Active Publication Date: 2011-01-12
中石化石油工程技术服务有限公司 +3
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Problems solved by technology

[0007] The X-ray fluorescence analysis method of the present invention, according to the new investigation of Petroleum Exploration and Development Research Institute of China Petroleum and Chemical Corporation, uses cuttings X-ray fluorescence to carry out mud logging lithology identification and element analysis, except for the "petroleum oil" in the above-mentioned disclosed patent application. Except for the "Drilling Geology X-ray Fluorescent Cuttings Logging Method" patent, there are no other publicly published domestic and foreign documents of the same kind

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  • Method for analyzing x-ray fluorescence shale content in petroleum well drilling
  • Method for analyzing x-ray fluorescence shale content in petroleum well drilling
  • Method for analyzing x-ray fluorescence shale content in petroleum well drilling

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Embodiment 1

[0041] The method for analyzing X-ray fluorescence shale content in petroleum drilling of the present invention includes X-ray fluorescence analysis of cores and cuttings at the drilling site, statistical analysis of chemical element data, calculation of shale content, and data processing. This example is selected X-ray fluorescence analysis data of a certain well in a gas field in the Ordos Basin is illustrated. The specific steps are as follows:

[0042] (1) X-ray fluorescence analysis of cores and cuttings

[0043] An energy dispersive X-ray fluorescence analyzer is used to continuously analyze the chemical elements of core and cuttings samples at the oil drilling site. During analysis, the core and cuttings samples are crushed and pressed into pieces, and then subjected to X-ray fluorescence analysis.

[0044] 1. Analysis instrument selection

[0045] The analysis instrument adopts energy dispersive X-ray fluorescence analyzer, and the current instrument is CIT-3000SY petroleum X...

Embodiment 2

[0089] Such as figure 2 As shown, figure 2 It is a comprehensive analysis diagram of the results of shale content calculated based on the iron element calculated by X-ray fluorescence analysis in a certain oil field in the Bohai Bay Basin and the results of geophysical logging and gas logging. From figure 2 It can be seen that the shale content curve calculated with iron has a certain correlation with the natural gamma curve of geophysical logging, indicating the feasibility of using iron to calculate the shale content in the Bohai Bay Basin; and the calculation with iron The shale content has an obvious negative correlation with the gas measured total hydrocarbon value. That is, if the shale content is high, the gas-tested total hydrocarbon value is low; if the shale content is low, the gas-tested total hydrocarbon value is high. Therefore, the gas logging results also proved the feasibility of calculating the shale content using the element values ​​of X-ray fluorescence a...

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Abstract

The invention discloses a method for analyzing shale content in petroleum drilling wells by utilizing X ray fluorescence. The method adopts a chromatic energy dispersion typed X ray fluorescence analyzer for implementing continuous analysis of chemical elements in rock cores and rock debris corresponding with the depth of the drilling wells in a petroleum drilling spot and obtaining X ray fluorescence analyzing data corresponding to the depth change; the linear regression method is adopted for implementing correlation analysis and statistics of the X ray fluorescence analyzing data, computingthe correlation coefficient between different elements, computing an average correlation coefficient between one element and other 11 elements, and choosing an element that has the largest average correlation coefficient; the shale content is computed; and a shale content curve corresponding to the depth change of the drilling wells is plotted. The method of the invention can be used for implementing timely and accurate shale content analysis of lithologic characters of drilled stratum, implementing qualification and quantitative evaluation to the lithologic characters and storage capability according to analyzing data of the shale content, and forming a drilled geology interpreting and evaluating method that realizes the analysis according to the X ray fluorescence in drilling spot, and can correctly and efficiently instruct the exploration, exploitation and drilling production of petroleum and natural gas.

Description

1. Technical Field: [0001] The invention relates to a method for analyzing shale content in petroleum drilling geology, in particular to a method for analyzing shale content in petroleum drilling with X-ray fluorescence. 2. Background technology: [0002] In petroleum drilling geology, the “shale content” in the rock is an important parameter for evaluating the properties of the reservoir. The shale content parameter can be obtained in time, which can evaluate the properties of the reservoir in time, gain the initiative for oil and gas layer protection, and provide well completion The determination of the plan and the formulation of the later exploration and development plan provide reliable data. [0003] According to the standard definition of GB / T 17412.2-1998, "shale" refers to the clay mineral composition in sedimentary rocks and the clastic composition with a particle size of <0.004mm. Rocks with a shale content of >50% are called argillaceous rocks. The shale content ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N23/223E21B49/08
Inventor 陈英毅何国贤周天顺王飞龙
Owner 中石化石油工程技术服务有限公司
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