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Carbonate rock original structure and pore type identification method

A carbonate rock and type identification technology, which is applied in the field of rock analysis, can solve problems such as low success rate and pore type identification, and achieve the effects of enhancing reliability, improving production methods, and improving microscopic imaging effects

Pending Publication Date: 2020-12-11
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the success rate of using fluorescence or cathodoluminescence microscopy to solve the problem is not high, and the above studies only focus on the restoration of the original structure, and do not identify the pore type

Method used

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  • Carbonate rock original structure and pore type identification method
  • Carbonate rock original structure and pore type identification method
  • Carbonate rock original structure and pore type identification method

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Embodiment 1

[0037] The invention provides a method for identifying the original structure and pore type of carbonate rocks, wherein the method for identifying the original structure and pore types of carbonate rocks is to carry out the original structure and pore type of the Permian dolomite samples in the Sichuan Basin. Identification, the process flow diagram of the method is as follows figure 1 shown, from figure 1 It can be seen that the method includes the following steps:

[0038] Step 1: After sampling, cut a circular slice from the carbonate rock sample, the diameter of the circular slice is about 2.5cm, and the thickness is 3mm; because the carbonate rock sample contains oil, it is necessary to use dichloride Methane washes the circular section thoroughly;

[0039] In the high-pressure chamber, the blue reagent is perfused into the pores of the circular slice, and the total perfusion time in this embodiment is 8h; the formula of the blue reagent is:

[0040] Low viscosity epox...

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Abstract

The invention provides a carbonate rock original structure and pore type identification method. The method comprises the following steps: (1) cutting a circular slice from a carbonate rock sample; (2)pouring a blue reagent into pores of the circular slice in a high-pressure cavity; (3) grinding the slice filled with the blue reagent into sheets; and (4) placing a piece of white semitransparent barium glass or a piece of white paper between the sheet and a microscope stage, and observing the sheet by using a microscope so as to identify the original structure and the pore type of the carbonaterock. According to the carbonate rock original structure and pore type identification method provided by the invention, a carbonate rock sheet manufacturing method is improved, and an observation mode under the microscope is improved so that a microscopic imaging effect of residual particles and pores in the carbonate rock can be improved; and technical support is provided for correctly identifying the original structure and the pore type and enhancing reliability of sedimentary environment and reservoir formation cause interpretation.

Description

technical field [0001] The invention relates to a method for identifying the original structure and pore type of carbonate rock, belonging to the technical field of rock analysis. Background technique [0002] The identification of the original structure and pore type of carbonate rocks is the basic work involved in any reservoir research, and it is of key significance for identifying the depositional environment, understanding the genesis of pores, and determining the distribution of reservoirs. For most ancient carbonate rocks and those Mesozoic and Cenozoic carbonate rocks that have undergone strong diagenetic transformation, the rock structure has become blurred or even beyond recognition due to new deformation, dolomitization, recrystallization, etc. The identification of structure and pore type has become a bottleneck problem restricting the follow-up work. [0003] The usual method to solve the above problems is to grind the rock into thin slices and observe it under...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/84G01N21/64G01N1/28
CPCG01N21/84G01N21/643G01N21/6458G01N1/2813
Inventor 潘立银郝毅
Owner PETROCHINA CO LTD
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