CN106019402B - The method of comprehensive distinguishing and Paleoclimatic Cycles inside checking thick sandstone - Google Patents
The method of comprehensive distinguishing and Paleoclimatic Cycles inside checking thick sandstone Download PDFInfo
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- CN106019402B CN106019402B CN201610319308.1A CN201610319308A CN106019402B CN 106019402 B CN106019402 B CN 106019402B CN 201610319308 A CN201610319308 A CN 201610319308A CN 106019402 B CN106019402 B CN 106019402B
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Abstract
The invention discloses a kind of method of comprehensive distinguishing and Paleoclimatic Cycles inside checking thick sandstone, using fossil plants content Y-factor method Y, coal rock component method, characteristic element method and carbon isotope method, the Paleoclimatic Cycles inside comprehensive distinguishing thick sandstone；According to different method of discrimination to palaeoclimatic sensitiveness, the Paleoclimatic Cycles identified are carried out with corresponding assignment, the accumulative total score for drawing each Paleoclimatic Cycles, the reliability for describing each Paleoclimatic Cycles of quantification.Afterwards, pass through the well logging data analysis of thick sandstone, identify the earth 's orbit parameter (reservoir rock and caprock) contained inside it, and the Paleoclimatic Cycles gone out with fossil plants content Y-factor method Y, coal rock component method, characteristic element method, carbon isotope method comprehensive distinguishing are contrasted, the earth 's orbit parameter of control Paleoclimatic Cycles development has substantially been found out from the origin cause of formation, Paleoclimatic Cycles has been improved and differentiates confidence level；This differentiation is convenient, flexible with verification method, with a high credibility, has preferable practicality.
Description
Technical field
The identification of Paleoclimatic Cycles and the method verified in original place accumulation thick sandstone are applicable the present invention relates to a kind of, especially
It is a kind of method of comprehensive distinguishing and Paleoclimatic Cycles inside checking thick sandstone.
Background technology
Predict that Future Climate is one of several problems of current facing mankind.Because Future Climate does not occur, what is used
Method accurately predicts the variation tendency of Future Climate, turns into the key for solving prediction Future Climate Change.According to " by the present
By Gu " thought and more geological theory, recognize geology period of history palaeoclimatic changing rule, explore paleo-climate change
Mechanism, and then predict following weather, this is an important channel for predicting Future Climate.
In the sedimentary rock of earth's surface extensive development, the change of the deposition of coal to weather is very sensitive, while is recorded in coal
The information of abundant paleo-climate change, particularly thickness huge coal seam, it is able to record the Gu of longer term in earth history
Climate change.
In coal seam thickness classification, coal seam of the thickness in monolayer more than 8m referred to as " thick sandstone " (poplar rises, Han Dexin,
1979).The huge coal seam of many thickness, such as single coal seam thickness of Chinese Er'lian Basin Shengli Coalfield are found that in world wide
244.7m, the Soviet Union good guest coalfield Cole goldfield list coal seam thickness 200m together, Southern Part of Ordos Basin Jurassic Coalfield individual layer
Coal seam thickness is up to more than 90 m, etc..
Research of the forefathers to Paleoclimatic Cycles is more scattered, and research object complexity is various, lacks specific aim, the method for system
Research, and fail inherently to differentiate the poor reliability of result to differentiating that result explains.
The content of the invention
The purpose of the present invention is to overcome above-mentioned the deficiencies in the prior art, there is provided a kind of comprehensive distinguishing and checking thick sandstone
The method of internal Paleoclimatic Cycles, this method synthesis is using fossil plants cryptogam, coal rock component, characteristic element, carbon isotope four
Parameter, the Paleoclimatic Cycles inside comprehensive distinguishing thick sandstone, differentiate that result reliability is high；Every kind of method of discrimination is carried out simultaneously
Assignment, and then the description comprehensive distinguishing reliable results degree that can be quantified；Afterwards, depth is carried out to the log data of thick sandstone
Information excavating, the earth 's orbit parameter (reservoir rock and caprock) contained in thick sandstone is identified, finds out that geologic climate is drilled
The governing factor of change, and then verify correctness and accuracy that Paleoclimatic Cycles differentiate.
To achieve the above object, the present invention uses following technical proposals：
A kind of method of comprehensive distinguishing and Paleoclimatic Cycles inside checking thick sandstone, comprises the following steps：
A. data prepares
1) according to a determining deviation, system intensive sampling, each sample carry out fossil plants cryptogam mirror to thick sandstone respectively from bottom to top
Fixed, coal petrography test, micro/macroelement test and carbon isotope test；
2) the gamma ray log data of thick sandstone layer position are collected；
B. Paleoclimatic Cycles differentiate
According to the fossil plants cryptogam identification of sample, coal petrography test, micro/macroelement test and carbon isotope test number
According to, Paleoclimatic Cycles identification is carried out with fossil plants content Y-factor method Y, coal rock component method, characteristic element method, carbon isotope method respectively,
Assignment is carried out according to certain scoring criteria to every kind of differentiation result, synthesis draws quantitative differentiation result；Then, huge thickness is found out
The average thickness of the number of Paleoclimatic Cycles present in coal seam and each Paleoclimatic Cycles；
Institute's specific method of discrimination of fossil plants content Y-factor method Y is：According to the palynomorph of fossil plants, content in thick sandstone
And the ecological characteristic of cryptogam parent, fossil plants SPORO-POLLEN FOSSILS is divided into four kinds of ecotypes：A. hygrophyte-growing environment
Moist plant；B. drought-halophytes-is grown in that the rainfall is plentiful, but larger higher weak of damp and hot, salinity of evaporation capacity covers water
Plant in environment；C. the more arid plant of mesad-build environment；D. wet mesad-between humidogene and mesad
Between ecotone plant；
In these ecotype plants, each fossil plants is the type plant quality content and other containing coefficient of discharge
The ratio of three types plant quality content sum；
According to height of all types of fossil plants containing coefficient of discharge, it can reflect that thick sandstone deposits the paleo-climate change of phase；
Drought-halophytes content COEFFICIENT KH-Y>1, reflect arid climate, KH-Y<1 reflection humid climate；
Wet mesad content COEFFICIENT KSZ>1, reflect humid climate, KSZ<1 reflection arid climate；
Hygrophyte content COEFFICIENT KSChange is not very sensitive, KS>Reflect humid climate when 0.5；
Mesad is insensitive to weather reflection, does not discuss；
C. Paleoclimatic Cycles are verified
Advanced treating is carried out to the log data (gamma ray log data) of thick sandstone, identifies the earth wherein contained
Revolution orbit parameter, and then identify reservoir rock and caprock；What is contained in analysis thick sandstone is joined by each revolution orbit of the earth
Number form into Paleoclimatic Cycles number, and the average thickness of each Climate Cycles；With the Paleoclimatic Cycles that differentiate in step B
Number and thickness compare, and find out the Earth orbital parameters that Paleoclimatic Cycles change in control thick sandstone, and then inherently
The governing factor of Paleoclimatic Cycles in thick sandstone is illustrated, so that the correctness of the Paleoclimatic Cycles determined in verification step B
With accuracy.
A determining deviation in the step A is：When coal seam thickness is less than or equal to 50m, spacing 0.2-0.5m, work as coal seam
Thickness can be expanded to 1m more than 50m, sampling interval；When the macrolithotype ofcoal thickness of thick sandstone is less than 0.2m, also to protect
Card adopts 1 sample.
The specific method of discrimination of characteristic element method is in the step B：The content of the elements Sr sensitive to geologic climate response>20
μ g/g, reflection weather is xeothermic,<0.15 μ g/g, reflect weather damp-warm syndrome；Element M n content,>0.15 μ g/g, reflection weather is xeothermic,
<0.15 μ g/g reflect weather damp-warm syndrome；Sr/Cu ratios>10 reflection dry hot climates,<10 reflection warm humid climates；Mg/Ca ratios>0.5
Reflect warm humid climate,<0.5 reflection arid climate；FeO/Fe2O3Ratio>0.7 reflection humid climate,<0.7 reflection arid climate；
CaO/(MgO+Al2O3) ratio>0.6 reflection temperature climate,<0.6 reflection is waited compared with cold air；(CaO+K2O+Na2O)/Al2O3Ratio,>
5 reflection arid climates,<5 reflection moist climates.
The specific recognition methods of coal rock component method is in the step B：In geologic climate xeothermic period, vitrinite contains in coal rock component
Measure that relatively low, inertinite content is higher, mirror/lazy ratio<1；In geologic climate warm and humid period, vitrinite's content is higher, lazy in coal rock component
Matter group content is relatively low, mirror/lazy ratio>1.
The mirror/lazy ratio is the ratio size of Mei Zhong vitrinites/inertinite volumn concentration.
The specific method of discrimination of carbon isotope method is in the step B：Carbon isotope δ13C values lighten (numerical value becomes big), i.e. δ13C values>When -21.5 ‰, reflection arid, the geologic climate of high temperature；Carbon isotope δ13C values become weight (numerical value diminishes), i.e. δ13C values<-
When 21.5 ‰, reflection is moist, the geologic climate of low temperature.
Scoring criteria described in the step B is：
Paleoclimatic Cycles checking specific method is in the step C：Identified using thick sandstone gamma ray log data
The earth 's orbit parameter (reservoir rock and caprock) contained in coal seam, calculate respectively included in thick sandstone the precession of the equinoxes,
Slope and eccentricity control Paleoclimatic Cycles thickness and number, and then with fossil plants Y-factor method Y, coal rock component method, characteristic element
The Paleoclimatic Cycles that plain method, carbon isotope method determine carry out checking analysis, and the control of Paleoclimatic Cycles development is found out from root
Factor processed, greatly increase the reliability for differentiating result.
The present invention be on the basis of forefathers part method of discrimination is inherited, combine fossil plants containing coefficient of discharge, coal rock component,
The analysis means such as characteristic element, carbon isotope, Paleoclimatic inside comprehensive distinguishing thick sandstone is carried out using multi-method, multi-angle
Return；Meanwhile the present invention according to different method of discrimination to palaeoclimatic sensitiveness, the Paleoclimatic Cycles determined are carried out corresponding
Assignment, the accumulative total score for drawing each Paleoclimatic Cycles, the reliability for describing each Paleoclimatic Cycles of quantification.Afterwards, lead to
The earth 's orbit parameter identification (reservoir rock and caprock) of log data is crossed, Paleoclimatic Cycles have been found out from origin mechanism
Development mechanism, and then demonstrate the correctness of Paleoclimatic Cycles comprehensive distinguishing result.
The present invention is comprehensive using fossil plants content Y-factor method Y, coal rock component method, characteristic element method, carbon isotope method, quantitative
The Paleoclimatic Cycles differentiated inside thick sandstone of change, differentiate that result accuracy is high, highly reliable；On this basis, pass through
Earth 's orbit parameter (reservoir rock and caprock) inside well logging data analysis identification thick sandstone, has found out Paleoclimatic
The governing factor educated is postbacked, and then fundamentally demonstrates the correctness that Paleoclimatic Cycles differentiate result.
Brief description of the drawings
Fig. 1 is the Paleoclimatic Cycles figure inside fossil plants content Y-factor method Y differentiation thick sandstone；
Fig. 2 is the Paleoclimatic Cycles figure inside coal rock component method differentiation thick sandstone；
Fig. 3 is the Paleoclimatic Cycles figure inside characteristic element method differentiation thick sandstone；
Fig. 4 is the Paleoclimatic Cycles figure inside carbon isotope method differentiation thick sandstone.
Embodiment
The present invention is further described with reference to the accompanying drawings and examples.
Structure, ratio, size depicted in this specification institute accompanying drawings etc., only coordinating in disclosed in specification
Hold, so that those skilled in the art understands and reads, be not limited to the enforceable qualifications of the present invention, therefore do not have skill
Essential meaning in art, the modification of any structure, the change of proportionate relationship or the adjustment of size, it can be produced not influenceing the present invention
Under the effect of raw and the purpose that can reach, all should still it fall in the range of disclosed technology contents are obtained and can covered.
Meanwhile cited such as " on ", " under " in this specification, "left", "right", the term of " centre " and " one ", it is merely convenient to
Narration understands, and is not used to limit the enforceable scope of the present invention, and its relativeness is altered or modified, without substantive change
Under technology contents, when being also considered as the enforceable category of the present invention.
The preferred forms of the present invention, can be carried out according to following 3 key steps：
It is research object that the present embodiment, which chooses Southern Part of Ordos Basin Huang Gansu Province coalfield Jurassic Period thick sandstone, carries out huge thickness
The differentiation research of Paleoclimatic Cycles inside coal seam, seek more accurately reflect the parameter of paleo-climate change, and these ginsengs
The correlation of number and paleo-climate change, identify Paleoclimatic Cycles present in thick sandstone；Afterwards, from earth 's orbit parameter
The angle of (eccentricity, ecliptic obliquity, the precession of the equinoxes) change, that is, identify reservoir rock and caprock, find out the control of paleo-climate change because
Element, and then the correctness that checking Paleoclimatic Cycles identify from " root ".
A. data prepares
1) thick sandstone according to a determining deviation from bottom to top system intensive sampling when coal seam thickness be less than or equal to 50 meters when,
Away from for 0.2-0.5m, when coal seam thickness is expanded to 1m more than 50m, sampling interval；When the macrolithotype ofcoal thickness of thick sandstone
During less than 0.2m, also to ensure to adopt 1 sample.
2) the gamma ray log data of thick sandstone layer position are collected；
B. Paleoclimatic Cycles differentiate
According to the fossil plants cryptogam identification of sample, coal petrography test, micro/macroelement test and carbon isotope test number
According to, Paleoclimatic Cycles identification is carried out with fossil plants content Y-factor method Y, coal rock component method, characteristic element method, carbon isotope method respectively,
Assignment is carried out according to certain scoring criteria to every kind of recognition result, synthesis draws quantitative recognition result；Then, huge thickness is illustrated
The number of Paleoclimatic Cycles and and its average thickness in coal seam.
Above-mentioned scoring criteria is：
C. Paleoclimatic Cycles are verified
Advanced treating is carried out to the log data (gamma ray log data) of thick sandstone, identifies the earth wherein contained
Revolution orbit parameter, and then identify reservoir rock and caprock；What is contained in analysis thick sandstone is joined by each revolution orbit of the earth
Number form into Paleoclimatic Cycles number, and the average thickness of each Climate Cycles；With the Paleoclimatic Cycles that differentiate in step B
Number and thickness compare, and find out the Earth orbital parameters that Paleoclimatic Cycles change in control thick sandstone, and then inherently
The governing factor of Paleoclimatic Cycles in thick sandstone is illustrated, so that the correctness of the Paleoclimatic Cycles determined in verification step B
With accuracy.
The present invention includes 3 major parts, and one is the differentiation of Paleoclimatic Cycles, and two be Paleoclimatic Cycles differentiation assignment, and three
For the checking of Paleoclimatic Cycles.
First, the differentiation of Paleoclimatic Cycles
(1) fossil plants content system method
The bulk deposition of fossil plants remains is the material base that coal accumulation occurs, by coal seam middle ancient times pollen and spore group
The correlation analysis of conjunction and the identification of plant fossil, the Paleo-plant community in coalforming period can be recovered.Fossil plants cryptogam in coal seam and
Quantity is various, intact in fine debris rock, different types of fossil plants palynological assemblage and ecological characteristic, can reflect coal-forming
Phase is warm moist or hot dry climate.
It is (dry and wet, cold and hot according to the ecological characteristic of the palynomorph of fossil plants, content and cryptogam parent in thick sandstone
Deng), fossil plants SPORO-POLLEN FOSSILS is divided into four kinds of ecotypes：A. the moist plant of hygrophyte (S)-growing environment；B. non-irrigated-
The rainfall is plentiful for halophytes (H-Y)-be grown in, but damp and hot, the weak plant covered in water environment that salinity is higher that evaporation capacity is larger
Thing；C. mesad (Z)-more arid plant of build environment；D. wet mesad (SZ)-between humidogene and mesad
Ecotone plant.In these ecotype plants, each fossil plants is the type plant quality containing coefficient of discharge
The ratio of content and other three types plant quality content sums.According to height of all types of fossil plants containing coefficient of discharge, substantially
On can reflect thick sandstone deposition the phase paleo-climate change.Drought-halophytes (K containing coefficient of dischargeH-Y)>1, reflect arid climate,
<1 reflection humid climate；Wet mesad (K containing coefficient of dischargeSZ)>1, reflect humid climate,<1 reflection arid climate；Hygrophyte
Containing coefficient of discharge (KS) change be not it is very sensitive,>Reflect that environment is very moist when 0.5；Mesad is insensitive to weather reflection, this
In do not discuss.
Instance analysis：By taking the 4# thick sandstones of Southern Part of Ordos Basin Huang Gansu Province coalfield JP areas PC holes as an example (Fig. 1), according to
The fossil plants of thick sandstone contain coefficient of discharge：Drought-halophytes (K containing coefficient of dischargeH-Y), wet mesad (K containing coefficient of dischargeSZ) and it is wet
Plant (K containing coefficient of dischargeS) change, can identify the thick sandstone formed the phase 4 warm and humid-xeothermic geologic climates occurred
Cycle changes, by early to evening each Paleoclimatic Cycles successively marked as I, II, III, IV, the coal seam thickness is 18.16m, average every
Individual Climate Cycles thickness is 4.54m.
(2) lithotype and coal quality component method
The maceral type and content of coal are to reflect the basic sign of the coal origin cause of formation.Vitrinite (V) is reduced covering water
Under the conditions of formed；Inertinite (I) is formed in relatively dry oxidizing condition.Mirror/lazy ratio (V/I, also referred to as humidity in coal
Coefficient) size, reflect the degree of humidity-drying of coalforming period peat bog.Vitrinite's content is high, and inertinite content is low, and mirror/
Lazy ratio (V/I)>1, reflection weather more warm moist；Vitrinite's content is low, and inertinite content is high, mirror/lazy ratio (V/I)<
1, reflection weather is more hot to be dried.
Instance analysis：
By taking the 4# thick sandstones of Southern Part of Ordos Basin Huang Gansu Province coalfield BC areas M10 holes as an example, according to vitrinite, inertinite
Content and mirror/lazy ratio (V/I) (Fig. 2), 4 warm and humid-xeothermic Paleoclimatic Cycles changes can be identified in thick sandstone,
By early to evening each Paleoclimatic Cycles successively marked as I, II, III, IV, the coal seam thickness is 11.30m, average each Climate Cycles
Thickness is 2.83m.
(3) characteristic element method
The content of the elements Sr sensitive to geologic climate response>20 μ g/g, reflection weather is xeothermic,<0.15 μ g/g, reflect weather
Damp-warm syndrome；Element M n content,>0.15 μ g/g, reflection weather is xeothermic,<0.15 μ g/g reflect weather damp-warm syndrome；Sr/Cu ratios>10 is anti-
Reflect dry hot climate,<10 reflection warm humid climates；Mg/Ca ratios>0.5 reflection warm humid climate,<0.5 reflection arid climate；FeO/
Fe2O3Ratio>0.7 reflection humid climate,<0.7 reflection arid climate；CaO/(MgO+Al2O3) ratio>The 0.6 warm gas of reflection
Wait,<0.6 reflection is waited compared with cold air；(CaO+K2O+Na2O)/Al2O3Ratio,>5 reflection arid climates,<5 reflection moist climates.
Instance analysis：By taking the 4# thick sandstones of Southern Part of Ordos Basin Huang Gansu Province coalfield BC areas M10 holes as an example, according to gas
Response sensitive trace elements and major elements and its ratio are waited, 4 warm and humid-xeothermic geologic climates can be identified in thick sandstone
Cycle changes (Fig. 3), by early to evening each Paleoclimatic Cycles successively marked as I, II, III, IV, the coal seam thickness is 11.30m, is put down
Each Climate Cycles thickness is 2.83m.
(4) carbon isotope method
Organic carbon isotope δ in coal seam13C values can represent temperature and humidity condition during peat deposits, i.e., with temperature
Rise, the drying that weather becomes, the enhancing of peat moor environment oxidisability, δ13C becomes weight (value becomes big)；When atmospheric humidity is relatively low, gas
Hole degree of leading and intracellular CO2Concentration is low (value diminishes), thus causes plant cellulose δ13C values increase, and then cause δ in coal13C becomes
Weight.Carbon isotope δ13C values lighten (numerical value becomes big), i.e. δ13C values>When -21.5 ‰, reflection arid, the geologic climate of high temperature；Carbon is same
The plain δ in position13C values become weight (numerical value diminishes), i.e. δ13C values<When -21.5 ‰, reflection is moist, the geologic climate of low temperature.
Instance analysis：It is same according to carbon by taking the 4# thick sandstones of Southern Part of Ordos Basin Huang Gansu Province coalfield BC areas M11 holes as an example
The plain δ in position13The change of C values, 4 warm and humid-xeothermic Paleoclimatic Cycles changes (Fig. 4) can be identified in thick sandstone, by morning
To evening each Paleoclimatic Cycles successively marked as I, II, III, IV, the coal seam thickness is 13.15m, average each Climate Cycles thickness
For 3.28m.
2nd, Paleoclimatic Cycles differentiate assignment
The present invention relates to 4 kinds of Paleoclimatic Cycles method of discrimination, fossil plants content Y-factor method Y, coal rock component method, feature
Element method, carbon isotope method are direct criterion；Research finds different method of discrimination to the sensitivitys of Paleoclimatic Cycles not
Together, in order to more accurately describe the reliability of discontinuity surface, this is studied has carried out assignment (table 1), full marks to various method of discrimination
For 100 points, score is higher, illustrates that reliability existing for this Paleoclimatic Cycles is bigger.Example case study the results are shown in Table 2.E Erduo
In the yellow Gansu Province coalfield in this basin south, difference drilling, distinct methods identify 4 Paleoclimatic Cycles in 4# thick sandstones.
Although the total score of different Paleoclimatic Cycles is different, all more than 80 points, confidence level is higher.
The weight assignment of 1 all kinds of diagnostic methods of table
Paleoclimatic Cycles comprehensive distinguishing result assignment table in the example thick sandstone of table 2
3rd, Paleoclimatic Cycles are verified
The earth has 3 basic revolution orbit parameters, i.e. eccentricity, ecliptic obliquity and the precession of the equinoxes, and this 3 parameters have each
Cycle period, the different geologic(al) periods it is regular change, and then control the change of weather on the earth.Using huge
The gamma ray log data of high seam, earth 's orbit parameter information (Milan section contained in thick sandstone can be identified
Tie up strange cycle), and then analyze the number of the various cycles by different earth 's orbit state modulators included in thick sandstone
And its average thickness；Afterwards, sentenced with foregoing with fossil plants content Y-factor method Y, coal rock component method, characteristic element method, carbon isotope method
The number for the Paleoclimatic Cycles not gone out carries out checking analysis with thickness, and the checking of Paleoclimatic Cycles is carried out from root, is added
The reliability that Paleoclimatic Cycles differentiate.
Instance analysis：By taking the thick sandstone of Southern Part of Ordos Basin Huang Gansu Province coalfield BC, JP area as an example, because Milan section ties up
Strange cycle is a macroscopical Climate Cycles, is changed in the range of yellow Gansu Province coal region little；In order to improve accuracy of identification, this
Select the thick sandstone row reservoir rock and caprock identification (table 3) of 3, BC and JP areas drilling.Yellow Gansu Province coalfield BC areas M10 holes
Coal seam thickness 11.3m, 4 Paleoclimatic Cycles, the average thickness of Paleoclimatic Cycles are identified with element method by coal rock component method and feature
Spend for 2.83m, coincide very much with the thickness 2.77m of this area's slope period.Coalfield BC areas M11 holes coal seam thickness 13.15m, lead to
Cross coal rock component method and feature and identify 4 Paleoclimatic Cycles with element method, Paleoclimatic Cycles average thickness is 3.28m, with this
The thickness 2.83m of regional slope period more coincide.Yellow Gansu Province coalfield JP areas PC holes coal seam thickness 18.16m, with plant content system
Number method identifies 4 Paleoclimatic Cycles, and Paleoclimatic Cycles average thickness is 4.54m, the thickness 4.12m with this area's slope period
More it coincide.To sum up analysis is understood, in Erdos south yellow Gansu Province coalfield thick sandstone (4#) thickness of Paleoclimatic Cycles with tiltedly
The coal seam cycle thickness of rate periodic Control is very approximate, it is believed that the development of Paleoclimatic Cycles is by Milan section in the thick sandstone
Tie up the control that slope period changes in strange cycle.And then inherently demonstrate Paleoclimatic Cycles and differentiate result, add this hair
The bright confidence level for differentiating Paleoclimatic Cycles.
Reservoir rock and caprock Periodic identification statistical form in Southern Part of Ordos Basin BC, JP areas thick sandstone of table 3
Although above-mentioned the embodiment of the present invention is described with reference to accompanying drawing, model not is protected to the present invention
The limitation enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not
Need to pay various modifications or deformation that creative work can make still within protection scope of the present invention.
Claims (6)
1. a kind of method of comprehensive distinguishing and Paleoclimatic Cycles inside checking thick sandstone, it is characterized in that, comprise the following steps：
A. data prepares
1）Thick sandstone according to determining deviation system intensive sampling from bottom to top, each sample carry out respectively the identification of fossil plants cryptogam,
Coal petrography test, micro/macroelement test and carbon isotope test；
2）Collect the gamma ray log data of thick sandstone layer position；
B. Paleoclimatic Cycles differentiate
According to the fossil plants cryptogam identification of sample, coal petrography test, micro/macroelement test and carbon isotope test data, divide
Paleoclimatic Cycles identification is not carried out with fossil plants content Y-factor method Y, coal rock component method, characteristic element method, carbon isotope method, to every
Kind differentiates that result carries out assignment according to certain scoring criteria, and synthesis draws quantitative differentiation result；Then, thick sandstone is found out
Present in the number of Paleoclimatic Cycles and the average thickness of each Paleoclimatic Cycles；
Institute's specific method of discrimination of fossil plants content Y-factor method Y is：According to the palynomorph of fossil plants in thick sandstone, content and
The ecological characteristic of cryptogam parent, fossil plants SPORO-POLLEN FOSSILS is divided into four kinds of ecotypes：A. hygrophyte；B. drought-salt life is planted
Thing；C. mesad；D. wet mesad；
In these ecotype plants, each fossil plants is the type plant quality content and other three kinds containing coefficient of discharge
The ratio of type plant quality content sum；According to height of all types of fossil plants containing coefficient of discharge, it can reflect that thick sandstone sinks
The paleo-climate change of product phase；
Drought-halophytes content COEFFICIENT KH-Y>1, reflect arid climate, KH-Y<1 reflection humid climate；
Wet mesad content COEFFICIENT KSZ>1, reflect humid climate, KSZ<1 reflection arid climate；
Hygrophyte content COEFFICIENT KSChange is not very sensitive, KS>0.5 reflection humid climate；
Mesad is insensitive to weather reflection, does not discuss；
The specific method of discrimination of characteristic element method is：
The content of the elements Sr sensitive to geologic climate response>20 μ g/g, reflection weather is xeothermic,<0.15 μ g/g, reflection weather are wet
Temperature；
Element M n content,>0.15 μ g/g, reflection weather is xeothermic,<0.15 μ g/g reflect weather damp-warm syndrome；
Sr/Cu ratios>10 reflection dry hot climates,<10 reflection warm humid climates；
Mg/Ca ratios>0.5 reflection warm humid climate,<0.5 reflection arid climate；
FeO/Fe2O3Ratio>0.7 reflection humid climate,<0.7 reflection arid climate；
CaO/（MgO+Al2O3）Ratio>0.6 reflection temperature climate,<0.6 reflection is waited compared with cold air；
（CaO+K2O+Na2O）/Al2O3Ratio,>5 reflection arid climates,<5 reflection moist climates；
C. Paleoclimatic Cycles are verified
Log data to thick sandstone is that gamma ray log data do advanced treating, identifies the revolution of the earth rail wherein contained
Road parameter, and then identify reservoir rock and caprock；What is contained in analysis thick sandstone is formed by each revolution orbit parameter of the earth
Paleoclimatic Cycles number, and the average thickness of each Climate Cycles；With the number of Paleoclimatic Cycles that differentiates in step B and
Thickness compares, and finds out the Earth orbital parameters that Paleoclimatic Cycles change in control thick sandstone, and then inherently illustrate huge
The governing factor of Paleoclimatic Cycles in high seam, so as to the correctness of Paleoclimatic Cycles that determines in verification step B with it is accurate
Property.
2. the method for comprehensive distinguishing as claimed in claim 1 and Paleoclimatic Cycles inside checking thick sandstone, it is characterized in that, institute
The determining deviation stated in step A is：When coal seam thickness is less than or equal to 50m, spacing 0.2-0.5m, when coal seam thickness exceedes
50m, sampling interval are expanded to 1m；When the macrolithotype ofcoal thickness of thick sandstone is less than 0.2m, also to ensure to adopt 1 sample
Product.
3. the method for comprehensive distinguishing as claimed in claim 1 and Paleoclimatic Cycles inside checking thick sandstone, it is characterized in that, institute
Stating the specific recognition methods of coal rock component method in step B is：In geologic climate xeothermic period, vitrinite's content is relatively low, lazy in coal rock component
Matter group content is higher, i.e. mirror/lazy ratio<1；
In geologic climate warm and humid period, vitrinite's content is higher in coal rock component, inertinite content is relatively low, i.e. mirror/lazy ratio>1；
The mirror/lazy ratio is the ratio size of Mei Zhong vitrinites/inertinite volumn concentration.
4. the method for comprehensive distinguishing as claimed in claim 1 and Paleoclimatic Cycles inside checking thick sandstone, it is characterized in that, institute
Stating the specific method of discrimination of carbon isotope method in step B is：Carbon isotope δ13C values lighten i.e. numerical value change greatly, i.e. δ13C values>-
When 21.5 ‰, reflection arid, the geologic climate of high temperature；Carbon isotope δ13It is that numerical value diminishes again that C values, which become, i.e. δ13C values<-21.5‰
When, reflection is moist, the geologic climate of low temperature.
5. the method for comprehensive distinguishing as claimed in claim 1 and Paleoclimatic Cycles inside checking thick sandstone, it is characterized in that, institute
The assignment stated in scoring criteria described in step B is respectively：
Fossil plants content Y-factor method Y is entered as 35；
Coal rock component method is entered as 30；
Sr, Mn, Sr/Cu and Mg/Ca assignment are 4 in characteristic element method；FeO/Fe2O3、CaO/（MgO+Al2O3）With（CaO+
K2O+Na2O）/Al2O3Assignment be 3；
Carbon isotope method is entered as 10.
6. the method for comprehensive distinguishing as claimed in claim 1 and Paleoclimatic Cycles inside checking thick sandstone, it is characterized in that, institute
Stating Paleoclimatic Cycles checking specific method in step C is：Identified in coal seam and contained using thick sandstone gamma ray log data
Earth 's orbit parameter be reservoir rock and caprock, calculate the precession of the equinoxes included in thick sandstone, slope and bias respectively
The thickness and number of the Paleoclimatic Cycles of rate control, so it is same with fossil plants Y-factor method Y, coal rock component method, characteristic element method, carbon
The Paleoclimatic Cycles that the plain method in position determines carry out checking analysis, and the governing factor of Paleoclimatic Cycles development is found out from root, increase
Add the reliability for differentiating result.
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