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Method for measuring order degree of dolomite based on laser Raman

A dolomite and order degree technology, applied in Raman scattering, test sample preparation, material excitation analysis, etc., can solve the problem that dolomite order degree cannot be measured in situ micro-area, etc., and achieve reliable technical guarantee, Low sample requirements and simple sample preparation

Inactive Publication Date: 2014-07-16
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The purpose of the present invention is to provide an effective and operable method for obtaining the order degree of dolomite based on laser Raman technology, which improves the effectiveness of dolomite genetic mechanism and geological fluid evolution analysis, and also solves the traditional The problem that the order degree of dolomite cannot be measured in situ

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  • Method for measuring order degree of dolomite based on laser Raman
  • Method for measuring order degree of dolomite based on laser Raman

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Embodiment Construction

[0016] Taking the Lower Ordovician dolomite geological sample in the Tarim Basin as an example below, the specific implementation method of the present invention will be further described in detail in conjunction with the accompanying drawings. The laser Raman spectrometer model used in this experiment is LabRAM Aramis (manufactured by HORIBA JobinYvon, France). Specific steps are as follows:

[0017] Step 1: Sample Preparation

[0018] The rock samples were sliced, polished thin slices on both sides, with a thickness of 0.1-0.3 mm, and conventional dolomite slices were obtained without a cover glass.

[0019] Step 2: Standard Calibration of Raman Instrument

[0020] First you need to use a silicon wafer (520.7cm -1 ) standard sample to calibrate the Raman spectrometer. When calibrating the standard sample, select a 633nm laser to collect the spectrum in real time on the silicon wafer. Get the peak position of the spectrum by removing the background and marking the peak po...

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Abstract

The invention relates to a method for measuring the order degree of dolomite based on laser Raman. The form and the half breadth of a Raman peak fully represent a relation between vibration information of atoms and molecules in a dolomite structure and the order degree of a sample. The dolomite is provided with six typical Raman feature peaks; the half breadth of the peak position 299 cm<-1> can represent the change of the order degree of the dolomite in the best way, namely the order degree is higher, and the half breadth value of the peak position is smaller, and the regularity is obvious; however, the representation of the half breadth of the peak position 1,097 cm<-1> on the change rule of the order degree of the dolomite is just opposite to that of the half breadth of the peak position 299 cm<-1>, namely the order degree is higher, and the Raman half breadth value is larger. A half breadth parameter of the dolomite in Raman spectrum analysis can be used as a molecular-scale index for representing the order degree of the sample; the method for measuring the order degree of the dolomite based on the laser Raman has a good application prospect in the research on a dolomite formation mechanism.

Description

technical field [0001] The invention relates to the technical field of petroleum geological exploration and development, in particular to a method for measuring the order degree of dolomite by using laser Raman technology. Background technique [0002] Dolomite CaMg(CO 3 ) 2 The crystal belongs to the trigonal crystal system, and the ideal dolomite crystal structure contains Ca 2+ Ions and Mg 2+ The number of ions is exactly the same, the mol concentrations of Ca and Mg each account for 50%, the cation occupancy is completely ordered, and the large radius Ca 2+ Occupies the A site, smaller radius Mg 2+ Occupy the B position. The concept of degree of order is mainly used to describe the arrangement of Ca ions and Mg ions in dolomite, and to explore the changes in the molecular structure of dolomite under different diagenesis and different dolomitization models. The main factors controlling the order degree of dolomite are as follows: ① degree of crystallinity, good euhe...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/65G01N1/32
Inventor 刘嘉庆李忠
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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