CN103033515B - Identification method of basic extrusive rock-basalt - Google Patents
Identification method of basic extrusive rock-basalt Download PDFInfo
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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
The present invention relates to a kind of base extrusive rock-basaltic authentication method, particularly a kind of method identifying base extrusive rock-andesite under orthogonal polarizing microscope, belong to rock crystal seed authenticate technology field.
Background technology
The basaltic authentication method of base extrusive rock 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 needs are delivered to the special unit analyzed sample crystalline substance and are done, time and effort consuming.
In sum, adopt existing authentication method, be difficult to quickly and accurately base extrusive rock-Irish touchstone and neutral extrusive rock-andesite 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 base extrusive rock-basaltic authentication method, especially one identifies base extrusive rock-basaltic method quickly and accurately under orthogonal polarizing microscope.
For reaching above-mentioned purpose, the invention provides a kind of base extrusive rock-basaltic authentication method, 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 x of described plagioclase;
When 24 degree of < x≤50 degree, the trade mark of described plagioclase is labradorite, then described magmatite rock sample is base extrusive rock-Irish touchstone.
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 detecting more than two plagioclases in described petrographic thin section, when the angle of extinction x of wherein at least one plagioclase meets 24 degree of < x≤50 degree, then described magmatite rock sample is base extrusive rock-Irish touchstone.
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.
Authentication method of the present invention is without the need to required by the angle of extinction assay method in conventionally: first must select satisfactory directed tangent plane, then the angle of extinction of petrographic thin section is measured, again according to the angle of extinction numerical value measured, utilize the relation qualification figure of the different crystal zone of plagioclase or cleavage (001) or (010) upper angle of extinction and composition, identify the trade mark of institute's deviational survey feldspar, then according to plagioclase trade mark determination rock class.
First authentication method of the present invention determines the general angle of extinction of the plagioclase of the more weak unknown trade mark of particle surface alteration phenomenon in the petrographic thin section of unknown Rock Species, namely, about direct-detection twin crystal boundary, the angle of extinction of two groups of plagioclase monomers, then calculates the angle of extinction of this plagioclase; The plagioclase trade mark is directly determined again, then according to the Rock Species of plagioclase trade mark determination magmatite according to the scope of angle of extinction numerical value.
The advantage of authentication method provided by the invention is: method of operating is simple, can identify base extrusive rock-Irish touchstone accurately and rapidly; Accurate 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 base extrusive rock-basaltic authentication method, be that sample is brilliant with the rock sample of the three Tang Hu oil field ox east 9 well Carboniferous systems (C2b) 1505.33 meters, 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 a=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=265 degree;
6, the difference of twice number of degrees a and b1, is the angle of extinction c1=333-265=68 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+68)/2=47 degree is the angle of extinction x of described plagioclase;
8, x=47 degree, it is in the scope of 24 degree of < x≤50 degree, and therefore, the rock sample of three ox east, the Tang Hu oil field 9 well Carboniferous systems (C2b) 1505.33 meters is base extrusive rock-Irish touchstone.
Embodiment 2
Present embodiments provide a kind of base extrusive rock-basaltic authentication method, be that sample is brilliant with the rock sample of the three Tang Hu oil field ox east 9 well Carboniferous systems (C2b) 1505.40 meters, 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=332 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=368 degree;
3, the difference of twice number of degrees a and b, is the angle of extinction c=368-332=36 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=332 degree;
5, rotation objective table of turning right makes another group plagioclase monomer in described plagioclase reach extinction position, record objective table scale b1=305 degree;
6, the difference of twice number of degrees a and b1, is the angle of extinction c1=332-305=27 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=(36+27)/2=31 degree is the angle of extinction x of described plagioclase;
8, x=31 degree, it is in the scope of 24 degree of < x≤50 degree, and therefore, the rock sample of three ox east, the Tang Hu oil field 9 well Carboniferous systems (C2b) 1505.40 meters is base extrusive rock-Irish touchstone.
Embodiment 3
Present embodiments provide a kind of base extrusive rock-basaltic authentication method, be that sample is brilliant with the rock sample of the three Tang Hu oil field ox east 9 well Carboniferous systems (C2b) 1515.39 meters, 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=111 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=128 degree;
3, the difference of twice number of degrees a and b, is the angle of extinction c=128-111=17 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=111 degree;
5, rotation objective table of turning right makes another group plagioclase monomer in described plagioclase reach extinction position, record objective table scale b1=158 degree;
6, the difference of twice number of degrees a and b1, is the angle of extinction c1=158-111=47 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=(17+47)/2=32 degree is the angle of extinction x of described plagioclase;
8, x=32 degree, it is in the scope of 24 degree of < x≤50 degree, and therefore, the rock sample of three ox east, the Tang Hu oil field 9 well Carboniferous systems (C2b) 1515.39 meters is base extrusive rock-Irish touchstone.
Embodiment 4
Present embodiments provide a kind of base extrusive rock-basaltic authentication method, be that sample is brilliant with the rock sample of the three Tang Hu oil field ox east 9 well Carboniferous systems (C2b) 1516.39 meters, 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=90 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=108 degree;
3, the difference of twice number of degrees a and b, is the angle of extinction c=108-90=18 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=90 degree;
5, rotation objective table of turning right makes another group plagioclase monomer in described plagioclase reach extinction position, record objective table scale b1=142 degree;
6, the difference of twice number of degrees a and b1, is the angle of extinction c1=142-90=52 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=(18+52)/2=35 degree is the angle of extinction x of described plagioclase;
8, x=35 degree, it is in the scope of 24 degree of < x≤50 degree, and therefore, the rock sample of three ox east, the Tang Hu oil field 9 well Carboniferous systems (C2b) 1516.39 meters is base extrusive rock-Irish touchstone.
Embodiment 5
Present embodiments provide a kind of base extrusive rock-basaltic authentication method, be that sample is brilliant with the rock sample of the three Tang Hu oil field ox east 9 well Carboniferous systems (C2b) 1520.39 meters, 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=148 degree;
3, the difference of twice number of degrees a and b, is the angle of extinction c=148-126=22 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=162 degree;
6, the difference of twice number of degrees a and b1, is the angle of extinction c1=162-126=36 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=(22+36)/2=29 degree is the angle of extinction x of described plagioclase;
8, x=29 degree, it is in the scope of 24 degree of < x≤50 degree, and therefore, the rock sample of three ox east, the Tang Hu oil field 9 well Carboniferous systems (C2b) 1520.39 meters is base extrusive rock-Irish touchstone.
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, basaltic 20 pieces of magmatite rock samples (authentication method listing wherein 5 pieces of rock samples only in embodiment 1-5, all the other authentication methods of 15 pieces are identical with expert's conclusion and embodiment 1-5) are accredited as comprising employing authentication method of the present invention.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 1.-2. representative region is Irish touchstone, 2. 1. region be Irish touchstone, region is trachybasalt.
Adopt authentication method of the present invention be accredited as basaltic 20 pieces of magmatite rock samples all in region 1.-2., wherein, all in region 1. (oval mark), therefore these 20 pieces of magmatite rock samples are Irish touchstone to 5 pieces of rock samples in embodiment 1-5.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 base extrusive rock of the present invention-basaltic authentication method is high.
Claims (2)
1. base extrusive rock-basaltic authentication method, 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 24 degree of < x≤50 degree, described plagioclase is labradorite, and described magmatite rock sample is base extrusive rock-Irish touchstone.
2. authentication method as claimed in claim 1, it is further comprising the steps of: the angle of extinction detecting more than two plagioclases in described petrographic thin section, when the angle of extinction x of wherein at least one plagioclase meets 24 degree of < x≤50 degree, then described magmatite rock sample is base extrusive rock-Irish touchstone.
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| CN111189830B (en) * | 2020-01-19 | 2022-08-19 | 山东省地质矿产勘查开发局第一地质大队 | Identification method of neutral volcanic rock-andesite |
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| CN102346139A (en) * | 2010-08-05 | 2012-02-08 | 中国石油天然气股份有限公司 | Identification method of andesine in fine settlement (sedimentary rock) |
| CN102506756A (en) * | 2011-11-16 | 2012-06-20 | 重庆国际复合材料有限公司 | Method for representing cross section appearance and dimensions of glass fibre or basalt fibre |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000162053A (en) * | 1998-11-24 | 2000-06-16 | Mitsubishi Materials Corp | Apparatus and method for analyzing stress in rock mass |
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| US5233409A (en) * | 1992-02-25 | 1993-08-03 | Schwab Karl W | Color analysis of organic constituents in sedimentary rocks for thermal maturity |
| CN102346139A (en) * | 2010-08-05 | 2012-02-08 | 中国石油天然气股份有限公司 | Identification method of andesine in fine settlement (sedimentary rock) |
| CN102506756A (en) * | 2011-11-16 | 2012-06-20 | 重庆国际复合材料有限公司 | Method for representing cross section appearance and dimensions of glass fibre or basalt fibre |
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