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Identification method of basic extrusive rock-basalt

An identification method and technology of extrusive rocks, applied in measuring devices, material analysis through optical means, instruments, etc., can solve the problems of time-consuming, laborious, difficult to distinguish, expensive, etc., and achieve the effect of simple operation methods

Active Publication Date: 2013-04-10
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 crystal to a special analysis unit, which is time-consuming and laborious.
[0006] In summary, it is difficult to quickly and accurately distinguish basic extrusive rocks-basalt from neutral extrusive rocks-andesite using existing identification methods, which may easily lead to errors in rock identification

Method used

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  • Identification method of basic extrusive rock-basalt

Examples

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Comparison scheme
Effect test

Embodiment 1

[0027] This example provides a method for identification of basic extrusive rock-basalt, using the Carboniferous (C2b) 1505.33-meter rock sample from Well Niudong 9 in Santanghu Oilfield as the sample crystal, and adopting the Petroleum and Natural Gas Industry Standard SY of the People's Republic of China / T5913-2004 "Rock Sectioning Method" to prepare rock thin slices of igneous rock samples, and use 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 plagioclase monom...

Embodiment 2

[0037] This example provides a method for identification of basic extrusive rocks-basalts, using the Carboniferous (C2b) 1505.40-meter rock sample from Well Niudong 9 in Santanghu Oilfield as the sample crystal, and adopting the Petroleum and Natural Gas Industry Standard SY of the People's Republic of China / T5913-2004 "Rock Sectioning Method" to prepare rock thin slices of igneous rock samples, and use 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=332 degrees;

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

Embodiment 3

[0047] This example provides a method for identification of basic extrusive rock-basalt, using the Carboniferous (C2b) 1515.39-meter rock sample from Well Niudong 9 in Santanghu Oilfield as the sample crystal, and adopting the Petroleum and Natural Gas Industry Standard SY of the People's Republic of China / T5913-2004 "Rock Sectioning Method" to prepare rock thin slices of igneous rock samples, and use 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=111 degrees;

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

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Abstract

The invention relates to an identification method of basic extrusive rock-basalt, which comprises the following steps: locating anorthose in a rock slice at the vision field center, finding bicrystal boundary of the anorthose, making the bicrystal boundary of the anorthose parallel to a vertical hair of an eyepiece cross hair, and recording the mark of an objective table; leftwards turning the objective table to enable a group of anorthose bodies to reach an extinction location, and recording the mark of the objective table; calculating the difference between the two readings, which is the extinction angle of the group of anorthose bodies; turning back the objective table, making the bicrystal boundary of the anorthose parallel to the vertical hair of an eyepiece cross hair, and recording the mark of the objective table; rightwards turning the objective table to enable another group of anorthose bodies to reach an extinction location, and recording the mark of the objective table; calculating the difference between the two readings, which is the extinction angle of the another group of anorthose bodies; calculating the average of the measured extinction angles of the two groups of anorthose bodies, which is the extinction angle x of the anorthose; and if x is larger than 24 degrees and smaller than or equal to 50 degrees, identifying the rock sample to be the basic extrusive rock-basalt. The method can provide the basis for oil detection direction of petroleum exploration and development and discovery of the new oil field, and is practicable.

Description

technical field [0001] The invention relates to a method for identifying basic extrusive rock-basalt, in particular to a method for identifying basic extrusive rock-andesite under an orthogonal polarizing microscope, and belongs to the technical field of rock crystal seed identification. Background technique [0002] The identification method of basic extrusive rock basalt currently used 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 and qua...

Claims

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Application Information

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IPC IPC(8): G01N21/84
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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