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Method for quickly identifying micro-area calcite and dolomite by using laser Raman spectrum

A technology of laser Raman spectroscopy and Raman spectrometer, which is applied in the field of sedimentary reservoir research and petrology in geological exploration, can solve problems such as improper operation process, easy misjudgment, troublesome preparation and storage of alizarin red, and achieve accurate recognition effect

Inactive Publication Date: 2020-02-14
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method can distinguish the components of different parts, but the preparation and storage of alizarin red is cumbersome, and improper operation can easily lead to misjudgment

Method used

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  • Method for quickly identifying micro-area calcite and dolomite by using laser Raman spectrum
  • Method for quickly identifying micro-area calcite and dolomite by using laser Raman spectrum
  • Method for quickly identifying micro-area calcite and dolomite by using laser Raman spectrum

Examples

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Embodiment 1

[0048] In this example, taking the Sinian Dengying Formation in the Xianfeng section of the southwest Sichuan Basin as an example, laser Raman analysis is performed on carbonate rock samples in this area, and dolomite is identified through the analyzed Raman spectrum, specifically including:

[0049] 1. Basic geological conditions and regional parameters:

[0050] The Xianfeng section is located in Ebian County in the southwest of the Sichuan Basin. The Sinian Dengying Formation develops carbonate rocks up to 1000m thick. Due to multi-stage diagenesis, the rock structure is complex and heterogeneous, and the pores need to be filled. The material composition is analyzed to determine the evolution characteristics of the reservoir.

[0051] 2. Implementation steps (such as figure 1 shown):

[0052] Step 1: Select a fresh carbonate rock sample, and grind the carbonate rock sample into a thin slice with a length and a width of 3×3 cm for laser Raman analysis.

[0053] Step 2: Us...

Embodiment 2

[0061] In this embodiment, taking the Triassic oolitic rock in Qiyue Mountain, Hubei Province as an example, laser Raman analysis is performed on the carbonate rock samples in this area, and calcite is identified by analyzing the obtained Raman spectrum. The process flow chart is as follows Figure 4 shown, from Figure 4 It can be seen that the identification process specifically includes the following steps:

[0062] Step 1: Select a fresh oolite sample, cut and polish the part to be analyzed to form a sample with a length, width, and height of 3×3×1cm for laser Raman analysis.

[0063] Step 2: Use a marking pen to circle the part of the surface of the sample obtained after cutting and surface polishing that needs to be analyzed. The diameter of the circled area is not less than 1 mm, specifically 1-5 mm.

[0064] Step 3: Place the sample obtained after cutting and surface polishing under the Raman spectrometer, and perform micro-area dotting in the circled area (such as ...

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Abstract

The invention provides a method for quickly identifying micro-area calcite and dolomite by using a laser Raman spectrum. The method comprises the following steps: selecting a fresh carbonate rock sample, and cutting and polishing the surface of the carbonate rock sample or grinding the carbonate rock sample into a thin sheet; selecting a dotting position on the surface of the sample or the thin sheet obtained after cutting and surface polishing, and performing dot circling; performing micro-area dotting in an area circled by the dot circling by using a laser Raman spectrometer to obtain a Raman spectrum; and performing contrast analysis on the Raman spectrum and a standard Raman spectrum, and judging mineral components to identify the calcite and the dolomite. By adopting the method for quickly identifying the micro-area calcite and the dolomite by using the laser Raman spectrum provided by the invention, the calcite and the dolomite in a micro-area (less than 1 millimeter) range can be quickly, simply, conveniently and accurately identified, the distribution characteristics of the calcite and the dolomite in rocks are determined, a diagenetic action process is reflected, and oil and gas exploration is guided.

Description

technical field [0001] The invention relates to a method for rapidly identifying calcite and dolomite in micro-regions by using laser Raman spectroscopy, and belongs to the technical field of petrology and sedimentary reservoir research in geological exploration. Background technique [0002] Worldwide, the oil and gas reserves and production of carbonate rock reservoirs account for 50% and 60% of the world's total oil and gas reserves and production, respectively, and calcite and dolomite are the two main minerals in carbonate rocks. The common methods and disadvantages of recognized identification of these two minerals mainly include: [0003] (1) X-ray diffraction: grind the sample into powder, and conduct semi-quantitative analysis on an X-ray diffraction instrument. This method cannot determine whether the composition of different parts of the carbonate rock is dolomite or calcite, and it is time-consuming and labor-intensive. [0004] (2) Drop dilute hydrochloric aci...

Claims

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Application Information

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IPC IPC(8): G01N21/65G01N1/28G01N1/32
CPCG01N1/286G01N1/32G01N21/65G01N2001/2873
Inventor 沈安江张杰胡安平周进高韦东晓潘立银李昌乔占峰倪新锋
Owner PETROCHINA CO LTD
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