Identification method for neutral extrusive rock-andesite

An identification method, a technology of extrusive rocks, applied in the direction of phase influence characteristic measurement, etc., can solve the problem of time-consuming and labor-intensive, high accuracy, and it is difficult to distinguish neutral extrusive rocks-andesite from basic extrusive rocks-basalt, etc. problem, to achieve the effect of simple operation method

Active Publication Date: 2013-04-03
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is a chemical analysis method, mainly based on SiO 2 Content to identify lithology, its accuracy is high, but the cost is expensive
Moreover, this method is not a common method. When using this method, it is generally necessary to send the sample to a special analysis unit, which is time-consuming and laborious.
[0006] In summary, it is difficult to quickly and accurately distinguish neutral extrusive rocks-andesite from basic extrusive rocks-basalt using existing identification methods, which may easily lead to rock identification errors

Method used

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  • Identification method for neutral extrusive rock-andesite

Examples

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Embodiment 1

[0027] This example provides a method for identification of neutral extrusive rock-andesite, using the Carboniferous (C2b) 1388.12-meter rock sample from Well Niudong 9-10 in Santanghu Oilfield as a sample, and adopting the Petroleum and Natural Gas Industry Standard of the People's Republic of China The method in SY / T5913-2004 "Rock Sectioning Method" prepares rock thin slices of igneous rock samples, and adopts the following steps to determine the type of the rock samples. The specific steps include:

[0028] 1. Select plagioclase with weak particle surface alteration in the above-mentioned rock slices and place it in the center of the field of view of the crossed polarizing microscope, find the twin crystal limit of the plagioclase, and make the twin crystal of the plagioclase The limit is parallel to the longitudinal wire of the reticle of the eyepiece, and the scale of the stage is recorded as a=333 degrees;

[0029] 2. Turn the stage to the left to make a group of plagio...

Embodiment 2

[0037] This example provides a method for identification of neutral extrusive rock-andesite, using the Carboniferous (C2b) 1401.88-meter rock sample from Well Niudong 9-10 in Santanghu Oilfield as a sample, and adopting the Petroleum and Natural Gas Industry Standard of the People's Republic of China The method in SY / T5913-2004 "Rock Sectioning Method" prepares rock thin slices of igneous rock samples, and adopts the following steps to determine the type of the rock samples. The specific steps include:

[0038] 1. Select plagioclase with weak particle surface alteration in the above-mentioned rock slices and place it in the center of the field of view of the crossed polarizing microscope, find the twin crystal limit of the plagioclase, and make the twin crystal of the plagioclase The limit is parallel to the longitudinal wire of the reticle of the eyepiece, and the scale of the stage is recorded as a=52 degrees;

[0039] 2. Turn the stage to the left to make a group of plagioc...

Embodiment 3

[0047] This example provides a method for identification of neutral extrusive rock-andesite, using the Carboniferous (C2b) 1425.27-meter rock sample from Well Niudong 9-10 in Santanghu Oilfield as a sample, and adopting the Petroleum and Natural Gas Industry Standard of the People's Republic of China The method in SY / T5913-2004 "Rock Sectioning Method" prepares rock thin slices of igneous rock samples, and adopts the following steps to determine the type of the rock samples. The specific steps include:

[0048] 1. Select plagioclase with weak particle surface alteration in the above-mentioned rock slices and place it in the center of the field of view of the crossed polarizing microscope, find the twin crystal limit of the plagioclase, and make the twin crystal of the plagioclase The limit is parallel to the longitudinal wire of the reticle of the eyepiece, and the scale of the stage is recorded as a=330 degrees;

[0049] 2. Turn the stage to the left to make a group of plagio...

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Abstract

The invention relates to an identification method for neutral extrusive rock-andesite, which includes the following steps: placing plagioclase in a rock slice in the center of the vision field of an orthogonal polarizing microscope, enabling the bicrystal dividing line to be parallel to the vertical hair of an eyepiece cross hair, and recording the ruling of an objective table; left turning the objective table to enable a pair of single bodies to reach extinction positions, and recording the ruling of the objective table; taking the degree difference of the two rulings as the extinction angle of the pair of single bodies; turning the objective table back to enable the bicrystal dividing line to be parallel to the vertical hair of the eyepiece cross hair, and recording the ruling of the objective table; taking the degree difference of the two rulings as the extinction angle of another pair of single bodies; calculating the average value of the extinction angles of the two pairs of single bodies, and taking the average value as the extinction angle x of the plagioclase; and judging that the plagioclase is andesine and the rock sample is neutral extrusive rock-andesite if x is not more than 24 degrees. The method has a practical value in providing reference for oil detection in petroleum exploration and development and new oil field discovery.

Description

technical field [0001] The invention relates to a method for identifying neutral extrusive rock-andesite, in particular to a method for identifying neutral extrusive rock-andesite under an orthogonal polarizing microscope, and belongs to the technical field of rock variety identification. Background technique [0002] The identification method of neutral extrusive rock-andesite currently adopted in China is based on the Petroleum and Natural Gas Industry Standard SY / T 5368--2000 "Identification of Rock Thin Sections" of the People's Republic of China. [0003] The disadvantage of this method is that the identification of basalt and andesite is based on mineral composition, structure, and structure. It is easy to confuse basalt and andesite, resulting in identification errors. In terms of mineral composition, basalt is mainly basic plagioclase, pyroxene, a small amount of hornblende and olivine; andesite mineral composition is mainly plagioclase, hornblende, pyroxene, biotite...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/43
Inventor 张丽霞李培俊李斌刘卫东石彦王辉丁风玲
Owner PETROCHINA CO LTD
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