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Method for identifying clay in micro-deposit (rock)

An identification method and sediment technology, applied in the field of identification of clay in fine sediments (rocks), can solve the problems of using many instruments and equipment, slow operation speed, long sample processing cycle, etc., and achieve a significant and fast method. Effect

Active Publication Date: 2012-02-08
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that it uses many instruments and equipment, the operation speed is slow, and the sample processing cycle is long. It is impossible to analyze the total amount of clay minerals in sedimentary rocks at any time for each sample.

Method used

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  • Method for identifying clay in micro-deposit (rock)
  • Method for identifying clay in micro-deposit (rock)
  • Method for identifying clay in micro-deposit (rock)

Examples

Experimental program
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Embodiment Construction

[0035] Taking the 1450.38-meter rock sample of Pingdiquan Formation (P2p) in Well H065 of Zhundong Huoshaoshan Oilfield as an example

[0036] Specific steps:

[0037] (1) Sampling is taken first, and rock samples with a diameter of 25mm×25mm×5mm or a diameter of 25mm×5mm are cut from each sample, and the remaining samples are used as hand specimens.

[0038] (2) Glue the rock samples that need to be glued are heated and dried in an electric oven at a temperature between 50°C and 60°C according to the number. Use rosin glue (preparation of rosin glue: weigh rosin and turpentine according to the ratio (mass ratio) of 3:2, put it in an enamel cup, heat it on a sand bath furnace, and keep stirring with a glass rod, so that the rosin is completely melted Turn off the electric furnace. Cool down and set aside.) Glue the rocks until the glue is baked until it can be crushed with fingers and the color of the glue is brown, then turn off the induction cooker, or directly use "502" gl...

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Abstract

The invention relates to a method for identifying clay in micro-deposit (rock), which comprises the following steps: placing a rock slice under an orthogonality polarization microscope; moving to a delustring position; rotating an objective table for 45 DEG, paralleling the long shaft direction of the mineral to be measured with diagonal bisector of second-quadrant and fourth-quadrant in an ocular lens of the microscope; inserting a gypsum test panel; overlapping the large refractive index formed by positive ductility and prolongation direction of the mineral to be measured with small refractive index of a gypsum test panel, wherein the interference color of a clay mineral is first-grade yellow; determining the content of the clay mineral with yellow interference color by an area eye estimation percentage method; rotating the objective table for 90 DEG, paralleling the long shaft direction of the mineral to be measured with diagonal bisector of first-quadrant and third-quadrant in theocular lens of the microscope; overlapping the large refractive index formed by positive ductility and prolongation direction of the mineral to be measured with small refractive index Z of the gypsumtest panel, wherein the interference color of the clay mineral is purple; determining the content of the clay mineral with purple interference color by the area eye estimation percentage method; accurately, rapidly identifying the clay mineral in the micro-deposit (rock).

Description

technical field [0001] The invention relates to a method for quickly and accurately identifying clay in fine deposits (rocks) (particle diameter less than 0.03mm) under a microscope. Background technique [0002] At present, under the polarizing microscope, it is difficult to distinguish volcanic ash tuff and argillaceous rock with fine particle size (particle size less than 0.03mm). Numerous 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 needle point, and it is impossible to distinguish the shape and interference color of a single fine mineral. It is easy to be confused and cause errors in lithology identification. Clay minerals are an important component of argillaceous rocks. Whether the rock is dominated by clay minerals is the main basis for distinguishing argillite from volcanic tuff. Argillaceous rocks belong ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/29G01N21/45G01N1/28G01N1/30G01N1/32
Inventor 张丽霞李培俊杨可
Owner PETROCHINA CO LTD
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