Method for identifying argillaceous rocks under polarizing microscope

A polarizing microscope and identification method technology, applied in the field of rock species identification, can solve the discussion of reservoir properties, influence the direction of oil exploration and development, and discover new oil fields, and cannot determine the relationship between lithology, electrical properties, oil-bearing properties and physical properties, etc. problem, to achieve the effect of simple operation method

Inactive Publication Date: 2015-03-18
PETROCHINA CO LTD
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Problems solved by technology

[0005] Argillaceous rock and volcanic ash tuff are fundamentally different rock types in nature. If the lithology is not accurately characterized, it is impossible to discuss the properties of the entire reservoir, and it is also imp

Method used

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Embodiment Construction

[0022] In order to understand the present invention in depth, the present invention will be described in detail below in conjunction with specific examples.

[0023] Taking the 1450.38-meter rock sample of the Pingdiquan Formation (P2p) in Well H065 of the Zhundong Huoshaoshan Oilfield as a sample, the following steps were used to identify the rock thin section. The specific steps include:

[0024] 1. Position the orientationally aligned minerals in the rock thin section of the clastic rock sample in the center of the field of view of the crossed polarizing microscope, and make the long axis direction of the aligned minerals parallel to the longitudinal crosshair of the eyepiece;

[0025] 2. Select a 5x objective lens;

[0026] 3. Insert the gypsum test board;

[0027] 4. Turn the stage to the right by 45 degrees, so that all oriented minerals are extinction phenomenon;

[0028] 5. Judging that the interference color x1 of all minerals aligned to the right is blue-purple;

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Abstract

The invention provides a method for identifying argillaceous rocks under a polarizing microscope, belonging to the technical field of rock variety identification. The method comprises the following steps: positioning directionally aligned minerals in rock slices in the center of the horizon of a crossed polarizing microscope, and enabling the directions of principal axes of the directionally aligned minerals to be parallel to a longitudinal cross hair of an eyepiece; selecting an objective lens with magnification times being 5; turning a stage to the right at an angle of 45 degrees to enable the directionally aligned minerals to be in an extinction state; inserting a gypsum test plate; judging that the directionally aligned minerals x1 towards the right have purple blue interference colors; determining the percentage content of all the directionally aligned minerals x1 towards the right with purple blue interference colors in the horizon by adopting an area visual estimation method; turning the stage to the left at an angle of 90 degrees; judging that the directionally aligned minerals x2 towards the left have orange interference colors; visually estimating the percentage content of all the directionally aligned minerals x2 towards the left with orange interference colors in the horizon. The method can provide the basis for the oil finding directions for petroleum exploration and development and discovery of new oilfields, and has practical values.

Description

Technical field: [0001] The invention relates to an identification method of argillaceous rock under a polarizing microscope, which belongs to the technical field of rock variety identification, and is a method for quickly and accurately identifying argillaceous rock with a particle size less than 0.0313 mm under a polarizing microscope. Background technique: [0002] At present, the identification method of argillaceous rock under the polarizing microscope in China is based on the People's Republic of China oil and gas industry standard SY / T5368--2000 "Identification of Rock Thin Sections". [0003] The disadvantage of this method is that it is difficult to distinguish argillaceous rocks with a particle size of less than 0.0313 mm from volcanic ash tuffs. Since countless fine clay minerals that make up argillaceous rocks and countless minerals that make up volcanic ash tuff are distributed in aggregates under a polarizing microscope, each fine mineral is in the shape of a n...

Claims

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Application Information

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IPC IPC(8): G01N21/29
Inventor 张丽霞谢建勇陈春勇向辉石彦
Owner PETROCHINA CO LTD
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