CN103018201B - Identification method for neutral extrusive rock-andesite - Google Patents
Identification method for neutral extrusive rock-andesite Download PDFInfo
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- CN103018201B CN103018201B CN201210567563.XA CN201210567563A CN103018201B CN 103018201 B CN103018201 B CN 103018201B CN 201210567563 A CN201210567563 A CN 201210567563A CN 103018201 B CN103018201 B CN 103018201B
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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
The present invention relates to a kind of authentication method of neutral extrusive rock-andesite, particularly a kind of method identifying neutral extrusive rock-andesite under orthogonal polarizing microscope, belongs to rock cultivar identification technical field.
Background technology
The authentication method of the neutral extrusive rock-andesite of current domestic employing carries out based on People's Republic of China (PRC) oil and gas industry standard SY/T 5368--2000 " petrographic thin section qualification ".
The shortcoming of the method is, qualification Irish touchstone and andesite are all from mineralogical composition, structure, structure are identified, easily Irish touchstone and andesite is obscured, so that qualification will make mistakes.In mineral composition, Irish touchstone is mainly basic plagioclase, pyroxene, a small amount of hornblende and peridot; Andesite mineralogical composition is mainly plagioclase, hornblende, pyroxene, black mica and quartz etc.When have pyroxene and a hornblende in rock for qualification time, being just not easy to identify this rock is Irish touchstone or andesite.When distinguishing Irish touchstone and andesite by structure, also to exist and easily obscure, identify the problem of makeing mistakes.Irish touchstone structure is mainly porphyritic texture, intergranular texture, intersertal texture, intersertal texture; Andesite structure is mainly porphyritic texture, pilotaxitic texture, glass basis pilotaxitic texture.When all comprising porphyritic texture in rock, just this rock of bad difference is Irish touchstone or andesite.In addition, when distinguishing Irish touchstone and andesite by structure, also to exist and easily obscure, identify the problem of makeing mistakes.Basaltic structure is mainly vesicular structure, amygdaloidal structure, columnar cleavage, pillow structure; Andesite structure is mainly vesicular structure, amygdaloidal structure and clumpy structure.Both all have vesicular structure and amygdaloidal structure, are difficult to the two to differentiate.
Lithology be evaluate reservoir electrically, the basis of oiliness and physical property relation.If lithology is qualitative inaccurate, just cannot discuss to the character of whole reservoir, also cannot determine lithology, relation electrically, between oiliness and physical property, thus, have a strong impact on the discovery of petroleum exploration and development oil searching direction and find.Therefore, science, exactly rock authentication method for petroleum exploration and development effectively carry out play key effect.
Domesticly also can adopt a kind of TAS (full alkali silicon dioxide) classification identification lithology, thus qualification Rock Species.The method is chemical analysis, mainly according to SiO
2content identifies lithology, and its accuracy is high, but somewhat expensive.And the method is not common method, when adopting the method, general unit sample being delivered to special analysis that needs does, time and effort consuming.
In sum, adopt existing authentication method, be difficult to quickly and accurately neutral extrusive rock-andesite and base extrusive rock-Irish touchstone be distinguished, easily cause rock to identify and make mistakes.
Summary of the invention
In order to solve the problem, the object of the present invention is to provide a kind of authentication method of neutral extrusive rock-andesite, especially a kind of method identifying neutral extrusive rock-andesite under orthogonal polarizing microscope quickly and accurately.
For reaching above-mentioned purpose, the invention provides a kind of authentication method of neutral extrusive rock-andesite, it comprises the following steps:
Plagioclase in the petrographic thin section of magmatite rock sample is positioned at the sighting center of orthogonal polarizing microscope, finds the twin crystal boundary of described plagioclase, and make the twin crystal boundary of described plagioclase parallel with the vertical silk of eyepiece crosshair, record objective table scale a;
Rotation objective table of turning left makes one group of plagioclase monomer in described plagioclase reach extinction position, record objective table scale b;
The difference of twice number of degrees, the i.e. value of b-a are the angle of extinction c of described one group of plagioclase monomer;
Again objective table is gone back to, make the twin crystal boundary of described plagioclase parallel with the vertical silk of eyepiece crosshair, record objective table scale a;
Rotation objective table of turning right makes another group plagioclase monomer in described plagioclase reach extinction position, record objective table scale b1;
The difference of twice number of degrees, the i.e. value of a-b1 are the angle of extinction c1 of another group plagioclase monomer described;
The mean value of the angle of extinction of two groups of plagioclase monomers measured by calculating, the i.e. value of (c+c1)/2 are the angle of extinction of described plagioclase;
When x≤24 degree, described plagioclase is andesine, then described magmatite rock sample is neutral extrusive rock-andesite.
In above-mentioned authentication method, the petrographic thin section of described magmatite rock sample is the petrographic thin section adopting the method in People's Republic of China (PRC) oil and gas industry standard SY/T 5913-2004 " rock flaking method " to produce.
In above-mentioned authentication method, preferably, the plagioclase being arranged in the petrographic thin section of sighting center is the plagioclase of particle surface alteration phenomenon more weak (particle surface is brighter and cleaner).
According to the specific embodiment of the present invention, preferably, above-mentioned authentication method can also comprise the following steps: the angle of extinction x detecting 20 plagioclases in described petrographic thin section, if wherein maximum angle of extinction is 24 degree, then described magmatite rock sample is neutral extrusive rock-andesite; If the angle of extinction x of survey 20 plagioclases does not reach 24 degree, and when each angle of extinction x surveyed meets x < 24 degree, then described magmatite rock sample is neutral extrusive rock-andesite.
Completely according to physics, chemical rule during magmatite crystallization, different temperature and pressures, the rock forming mineral that crystallization is different, and the mineral that same temperature and pressure crystallizes out are sames.Neutral extrusive rock-andesite is the neutral extrusive rock class of calc-alkaline that magmatite mesosilicic acid is saturated, and base extrusive rock-Irish touchstone is the base extrusive rock of the calc-alkaline in magmatite.Form neutral extrusive rock-andesite more single with base extrusive rock-basaltic mineralogical composition, regular strong, essential mineral is all plagioclase, wherein, the essential mineral of neutral extrusive rock-andesite is generally andesine, and base extrusive rock-basaltic essential mineral is generally labradorite.
The optical means measuring feldspar is a lot, as universal stage method, oil-immersion method, thin section identification method etc. with common polarizing microscope.But, often kind of method all must select suitable directed tangent plane, and must a series of optical data such as Accurate Determining refractive index, birefraction, optical angle, relevant qualification chart is utilized to identify, in this process, also need to coordinate other means, as oil-immersion method, universal stage measure optical angle (2V) etc., existing authentication method is operated very complicated.
Do not need in qualification process of the present invention first to select satisfactory directed tangent plane to survey angle of extinction again, but directly survey angle of extinction, and without the need to positioning optical indicatrix axes.Authentication method of the present invention is the angle of extinction of the plagioclase first determining the more weak unknown trade mark of many particle surface alteration phenomenon in the petrographic thin section of unknown Rock Species, if wherein maximum angle of extinction is 24 degree, then this angle of extinction is the maximum angle of extinction of plagioclase, so detected plagioclase is andesine, and the face of measured maximum angle of extinction is the tangent plane of the maximum angle of extinction of andesine.Due to the impact of the slice direction of petrographic thin section, many feldspars do not reach maximum angle of extinction, the face that section does not switch to representated by maximum angle of extinction, if the angle of extinction that have detected 20 plagioclases does not all detect the maximum angle of extinction of 24 degree, but the angle of extinction detected all is less than 24 degree, this just illustrates that petrographic thin section does not switch to the face of the maximum angle of extinction of andesine, so also can show that detected plagioclase is the conclusion of andesine.After showing that surveyed plagioclase is the conclusion of andesine, then can determine that measured rock sample is neutral extrusive rock-andesite.
The advantage of authentication method provided by the invention is: first determine without the need to using universal stage which tangent plane is the optical orientation of plagioclase belong to, the angle of extinction of this tangent plane need not be surveyed, without the need to positioning optical indicatrix axes, also need not look into relevant qualification chart, then determine the composition (the plagioclase trade mark) of plagioclase; Method of operating is simple, can identify neutral extrusive rock-andesite accurately and rapidly; Foundation can be provided for the discovery of petroleum exploration and development oil searching direction and find, there is practical value.
Accompanying drawing explanation
Fig. 1 is the full alkali-silicon dioxide figure of 100 pieces of magmatite rock samples of ox Dong9-10Jing.
Embodiment
In order to understand the present invention in depth, below in conjunction with specific embodiment, the present invention is described in detail.
Embodiment 1
Present embodiments provide a kind of authentication method of neutral extrusive rock-andesite, with the rock sample in 1388.12 meters, the three Tang Hu oil field ox east 9-10 well Carboniferous system (C2b) for sample, the method in People's Republic of China (PRC) oil and gas industry standard SY/T5913-2004 " rock flaking method " is adopted to produce the petrographic thin section of magmatite rock sample, adopt following steps to measure the kind of this rock sample, concrete steps comprise:
1, plagioclase that in above-mentioned petrographic thin section, particle surface alteration phenomenon is more weak is selected to be placed in the sighting center of orthogonal polarizing microscope, find the twin crystal boundary of described plagioclase, and make the twin crystal boundary of described plagioclase parallel with the vertical silk of eyepiece crosshair, record objective table scale a=333 degree;
2, rotation objective table of turning left makes one group of plagioclase monomer in described plagioclase reach extinction position, record objective table scale b=359 degree;
3, the difference of twice number of degrees a and b, is the angle of extinction c=359-333=26 degree of described one group of plagioclase monomer;
4, again objective table is gone back to, make the twin crystal boundary of described plagioclase parallel with the vertical silk of eyepiece crosshair, record objective table scale a1=333 degree;
5, rotation objective table of turning right makes another group plagioclase monomer in described plagioclase reach extinction position, record objective table scale b1=315 degree;
6, the difference of twice number of degrees a1 and b1, is the angle of extinction c1=333-315=18 degree of another group plagioclase monomer described;
The mean value of the angle of extinction of two groups of plagioclase monomers 7, measured by calculating, i.e. (c+c1)/2=(26+18)/2=22 degree is the angle of extinction x of described plagioclase;
8, x=22 degree, it is in the scope of x≤24 degree, and described plagioclase is andesine, and therefore, the rock sample of three ox east, the Tang Hu oil field 9 well Carboniferous systems (C2b) 1388.12 meters is neutral extrusive rock-andesite.
Embodiment 2
Present embodiments provide a kind of authentication method of neutral extrusive rock-andesite, with the rock sample in 1401.88 meters, the three Tang Hu oil field ox east 9-10 well Carboniferous system (C2b) for sample, the method in People's Republic of China (PRC) oil and gas industry standard SY/T5913-2004 " rock flaking method " is adopted to produce the petrographic thin section of magmatite rock sample, adopt following steps to measure the kind of this rock sample, concrete steps comprise:
1, plagioclase that in above-mentioned petrographic thin section, particle surface alteration phenomenon is more weak is selected to be placed in the sighting center of orthogonal polarizing microscope, find the twin crystal boundary of described plagioclase, and make the twin crystal boundary of described plagioclase parallel with the vertical silk of eyepiece crosshair, record objective table scale a=52 degree;
2, rotation objective table of turning left makes one group of plagioclase monomer in described plagioclase reach extinction position, record objective table scale b=31 degree;
3, the difference of twice number of degrees a and b, is the angle of extinction c=52-31=21 degree of described one group of plagioclase monomer;
4, again objective table is gone back to, make the twin crystal boundary of described plagioclase parallel with the vertical silk of eyepiece crosshair, record objective table scale a=52 degree;
5, rotation objective table of turning right makes another group plagioclase monomer in described plagioclase reach extinction position, record objective table scale b1=59 degree;
6, the difference of twice number of degrees a and b1, is the angle of extinction c1=59-52=7 degree of another group plagioclase monomer described;
The mean value of the angle of extinction of two groups of plagioclase monomers 7, measured by calculating, i.e. (c+c1)/2=(21+7)/2=14 degree is the angle of extinction x of described plagioclase;
8, x=14 degree, it is in the scope of x≤24 degree, and described plagioclase is andesine, and therefore, the rock sample of three ox east, the Tang Hu oil field 9 well Carboniferous systems (C2b) 1401.88 meters is neutral extrusive rock-andesite.
Embodiment 3
Present embodiments provide a kind of authentication method of neutral extrusive rock-andesite, with the rock sample in 1425.27 meters, the three Tang Hu oil field ox east 9-10 well Carboniferous system (C2b) for sample, the method in People's Republic of China (PRC) oil and gas industry standard SY/T5913-2004 " rock flaking method " is adopted to produce the petrographic thin section of magmatite rock sample, adopt following steps to measure the kind of this rock sample, concrete steps comprise:
1, plagioclase that in above-mentioned petrographic thin section, particle surface alteration phenomenon is more weak is selected to be placed in the sighting center of orthogonal polarizing microscope, find the twin crystal boundary of described plagioclase, and make the twin crystal boundary of described plagioclase parallel with the vertical silk of eyepiece crosshair, record objective table scale a=330 degree;
2, rotation objective table of turning left makes one group of plagioclase monomer in described plagioclase reach extinction position, record objective table scale b=359 degree;
3, the difference of twice number of degrees a and b, is the angle of extinction c=359-330=29 degree of described one group of plagioclase monomer;
4, again objective table is gone back to, make the twin crystal boundary of described plagioclase parallel with the vertical silk of eyepiece crosshair, record objective table scale a=330 degree;
5, rotation objective table of turning right makes another group plagioclase monomer in described plagioclase reach extinction position, record objective table scale b1=314 degree;
6, the difference of twice number of degrees a and b1, is the angle of extinction c1=330-314=16 degree of another group plagioclase monomer described;
The mean value of the angle of extinction of two groups of plagioclase monomers 7, measured by calculating, i.e. (c+c1)/2=(29+16)/2=22.5 degree is the angle of extinction x of described plagioclase;
8, x=22.5 degree, it is in the scope of x≤24 degree, and described plagioclase is andesine, and therefore, the rock sample of three ox east, the Tang Hu oil field 9 well Carboniferous systems (C2b) 1425.27 meters is neutral extrusive rock-andesite.
Embodiment 4
Present embodiments provide a kind of authentication method of neutral extrusive rock-andesite, with the rock sample in 1426.70 meters, the three Tang Hu oil field ox east 9-10 well Carboniferous system (C2b) for sample, the method in People's Republic of China (PRC) oil and gas industry standard SY/T5913-2004 " rock flaking method " is adopted to produce the petrographic thin section of magmatite rock sample, adopt following steps to measure the kind of this rock sample, concrete steps comprise:
1, plagioclase that in above-mentioned petrographic thin section, particle surface alteration phenomenon is more weak is selected to be placed in the sighting center of orthogonal polarizing microscope, find the twin crystal boundary of described plagioclase, and make the twin crystal boundary of described plagioclase parallel with the vertical silk of eyepiece crosshair, record objective table scale a=236 degree;
2, rotation objective table of turning left makes one group of plagioclase monomer in described plagioclase reach extinction position, record objective table scale b=259 degree;
3, the difference of twice number of degrees a and b, is the angle of extinction c=259-236=23 degree of described one group of plagioclase monomer;
4, again objective table is gone back to, make the twin crystal boundary of described plagioclase parallel with the vertical silk of eyepiece crosshair, record objective table scale a=236 degree;
5, rotation objective table of turning right makes another group plagioclase monomer in described plagioclase reach extinction position, record objective table scale b1=247 degree;
6, the difference of twice number of degrees a and b1, is the angle of extinction c1=247-236=11 degree of another group plagioclase monomer described;
The mean value of the angle of extinction of two groups of plagioclase monomers 7, measured by calculating, i.e. (c+c1)/2=(23+11)/2=17 degree is the angle of extinction x of described plagioclase;
8, x=17 degree, it is in the scope of x≤24 degree, and described plagioclase is andesine, and therefore, the rock sample of three ox east, the Tang Hu oil field 9 well Carboniferous systems (C2b) 1426.70 meters is neutral extrusive rock-andesite.
Embodiment 5
Present embodiments provide a kind of authentication method of neutral extrusive rock-andesite, with the rock sample in 1430.70 meters, the three Tang Hu oil field ox east 9-10 well Carboniferous system (C2b) for sample, the method in People's Republic of China (PRC) oil and gas industry standard SY/T5913-2004 " rock flaking method " is adopted to produce the petrographic thin section of magmatite rock sample, adopt following steps to measure the kind of this rock sample, concrete steps comprise:
1, plagioclase that in above-mentioned petrographic thin section, particle surface alteration phenomenon is more weak is selected to be placed in the sighting center of orthogonal polarizing microscope, find the twin crystal boundary of described plagioclase, and make the twin crystal boundary of described plagioclase parallel with the vertical silk of eyepiece crosshair, record objective table scale a=126 degree;
2, rotation objective table of turning left makes one group of plagioclase monomer in described plagioclase reach extinction position, record objective table scale b=138 degree;
3, the difference of twice number of degrees a and b, is the angle of extinction c=138-126=12 degree of described one group of plagioclase monomer;
4, again objective table is gone back to, make the twin crystal boundary of described plagioclase parallel with the vertical silk of eyepiece crosshair, record objective table scale a=126 degree;
5, rotation objective table of turning right makes another group plagioclase monomer in described plagioclase reach extinction position, record objective table scale b1=146 degree;
6, the difference of twice number of degrees a and b1, is the angle of extinction c1=146-126=20 degree of another group plagioclase monomer described;
The mean value of the angle of extinction of two groups of plagioclase monomers 7, measured by calculating, i.e. (c+c1)/2=(12+20)/2=16 degree is the angle of extinction x of described plagioclase;
8, x=16 degree, it is in the scope of x≤24 degree, and described plagioclase is andesine, and therefore, the rock sample of three ox east, the Tang Hu oil field 9 well Carboniferous systems (C2b) 1430.70 meters is neutral extrusive rock-andesite.
Embodiment 6
Present embodiments provide a kind of authentication method of neutral extrusive rock-andesite, with the rock sample in 1451.88 meters, the three Tang Hu oil field ox east 9-10 well Carboniferous system (C2b) for sample, the method in People's Republic of China (PRC) oil and gas industry standard SY/T5913-2004 " rock flaking method " is adopted to produce the petrographic thin section of magmatite rock sample, adopt following steps to measure the kind of this rock sample, concrete steps comprise:
1, plagioclase that in above-mentioned petrographic thin section, particle surface alteration phenomenon is more weak is selected to be placed in the sighting center of orthogonal polarizing microscope, find the twin crystal boundary of described plagioclase, and make the twin crystal boundary of described plagioclase parallel with the vertical silk of eyepiece crosshair, record objective table scale a=57 degree;
2, rotation objective table of turning left makes one group of plagioclase monomer in described plagioclase reach extinction position, record objective table scale b=43 degree;
3, the difference of twice number of degrees a and b, is the angle of extinction c=57-43=14 degree of described one group of plagioclase monomer;
4, again objective table is gone back to, make the twin crystal boundary of described plagioclase parallel with the vertical silk of eyepiece crosshair, record objective table scale a=57 degree;
5, rotation objective table of turning right makes another group plagioclase monomer in described plagioclase reach extinction position, record objective table scale b1=59 degree;
6, the difference of twice number of degrees a and b1, is the angle of extinction c1=59-57=2 degree of another group plagioclase monomer described;
The mean value of the angle of extinction of two groups of plagioclase monomers 7, measured by calculating, i.e. (c+c1)/2=(14+2)/2=8 degree is the angle of extinction x of described plagioclase;
8, x=8 degree, it is in the scope of x≤24 degree, and described plagioclase is andesine, and therefore, the rock sample of three ox east, the Tang Hu oil field 9 well Carboniferous systems (C2b) 1451.88 meters is neutral extrusive rock-andesite.
The Accuracy Verification of authentication method
In order to confirm the accuracy of authentication method of the present invention, 100 of ox Dong9-10Jing pieces of magmatite rock samples are sent outside and have been carried out the chemical composition analysis of silicate by inventor, comprising the 70 pieces of magmatite rock samples (authentication method listing wherein 6 pieces of rock samples only in embodiment 1-6, all the other authentication methods of 64 pieces are identical with expert's conclusion and embodiment 1-6) adopting authentication method of the present invention to be accredited as andesite.Fig. 1 is the full alkali-silicon dioxide figure of 100 pieces of magmatite rock samples of ox Dong9-10Jing, wherein label 1.-6. representative region is different types of andesite and basaltic chemical composition, wherein region 3.-be 6. andesite, 3. region is that basaltic andesite, region are 4. for andesite, region are 5. for basaltic trachyandesite, region are 6. for trachyandesite.
The 70 pieces of magmatite rock samples adopting authentication method of the present invention to be accredited as andesite all in region 3.-6., wherein, all in region 3. (oval mark), therefore these 70 pieces of magmatite rock samples are andesite to 6 pieces of rock samples in embodiment 1-6.It can thus be appreciated that the qualification result of chemical composition analysis is consistent with the qualification result in embodiment.Therefore, the accuracy of the authentication method of neutral extrusive rock-andesite of the present invention is high.
Claims (2)
1. an authentication method for neutral extrusive rock-andesite, it comprises the following steps:
Plagioclase in the petrographic thin section of magmatite rock sample is positioned at the sighting center of orthogonal polarizing microscope, finds the twin crystal boundary of described plagioclase, and make the twin crystal boundary of described plagioclase parallel with the vertical silk of eyepiece crosshair, record objective table scale a; Wherein, the plagioclase being arranged in the petrographic thin section of sighting center is the more weak plagioclase of particle surface alteration phenomenon;
Rotation objective table of turning left makes one group of plagioclase monomer in described plagioclase reach extinction position, record objective table scale b;
The difference of twice number of degrees, the i.e. value of b-a are the angle of extinction c of described one group of plagioclase monomer;
Again objective table is gone back to, make the twin crystal boundary of described plagioclase parallel with the vertical silk of eyepiece crosshair, record objective table scale a;
Rotation objective table of turning right makes another group plagioclase monomer in described plagioclase reach extinction position, record objective table scale b1;
The difference of twice number of degrees, the i.e. value of a-b1 are the angle of extinction c1 of another group plagioclase monomer described;
The mean value of the angle of extinction of two groups of plagioclase monomers measured by calculating, the i.e. value of (c+c1)/2 are the angle of extinction x of described plagioclase;
When x≤24 degree, institute's deviational survey feldspar is andesine, and described magmatite rock sample is neutral extrusive rock-andesite.
2. authentication method as claimed in claim 1, it is further comprising the steps of: the angle of extinction x detecting 20 plagioclases in described petrographic thin section, if wherein maximum angle of extinction is 24 degree, then described magmatite rock sample is neutral extrusive rock-andesite; If the angle of extinction x of survey 20 plagioclases does not reach 24 degree, and each angle of extinction x surveyed meets x<24 when spending, then described magmatite rock sample is neutral extrusive rock-andesite.
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