CN109298064A - Carbonate rock ancient buried hill unconformity recognition method based on strontium isotope analysis - Google Patents
Carbonate rock ancient buried hill unconformity recognition method based on strontium isotope analysis Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 56
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 title claims abstract description 53
- 238000004458 analytical method Methods 0.000 title claims abstract description 30
- 239000011435 rock Substances 0.000 title claims abstract description 30
- 229910052712 strontium Inorganic materials 0.000 title claims abstract description 22
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 238000005553 drilling Methods 0.000 claims abstract description 8
- 238000000576 coating method Methods 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 6
- 238000007373 indentation Methods 0.000 claims description 5
- 239000004615 ingredient Substances 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 4
- 239000011159 matrix material Substances 0.000 claims description 4
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- 239000011521 glass Substances 0.000 claims description 3
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- 239000000853 adhesive Substances 0.000 claims description 2
- 230000001070 adhesive effect Effects 0.000 claims description 2
- 238000007873 sieving Methods 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 abstract description 6
- 230000008859 change Effects 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 4
- 239000000523 sample Substances 0.000 description 48
- 238000010586 diagram Methods 0.000 description 7
- 238000012360 testing method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000005755 formation reaction Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 239000013535 sea water Substances 0.000 description 3
- 239000000470 constituent Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 230000004069 differentiation Effects 0.000 description 2
- 230000009189 diving Effects 0.000 description 2
- 239000010459 dolomite Substances 0.000 description 2
- 229910000514 dolomite Inorganic materials 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000000155 isotopic effect Effects 0.000 description 2
- 238000002386 leaching Methods 0.000 description 2
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- BVPWJMCABCPUQY-UHFFFAOYSA-N 4-amino-5-chloro-2-methoxy-N-[1-(phenylmethyl)-4-piperidinyl]benzamide Chemical compound COC1=CC(N)=C(Cl)C=C1C(=O)NC1CCN(CC=2C=CC=CC=2)CC1 BVPWJMCABCPUQY-UHFFFAOYSA-N 0.000 description 1
- 229910021532 Calcite Inorganic materials 0.000 description 1
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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Abstract
The invention provides a carbonate rock ancient buried hill unconformity recognition method based on strontium isotope analysis, which comprises the following steps: (1) obtaining a rock core sample or a rock debris sample of carbonate rock ancient buried hill drilling; (2) subjecting the sample obtained in step (1) to isotope analysis to obtain87Sr/86The Sr ratio; (3) with the product obtained in step (2)87Sr/86The Sr ratio is an abscissa, the depth data corresponding to the sample in the step (1) is an ordinate, and an intersection graph is drawn(ii) a (4) And (4) identifying the unconformity surface of the carbonate rock ancient buried hill according to the intersection drawing in the step (3). The method for identifying the unconformity surface of the carbonate rock ancient buried hill based on the strontium isotope analysis is a method for searching and judging the unconformity surface of the carbonate rock ancient buried hill, and is used for identifying the unconformity surface of the carbonate rock ancient buried hill based on the change rule of the strontium isotope in the processes of formation and later evolution of the carbonate rock.
Description
Technical field
The present invention relates to a kind of buried carbonate hills plane of unconformity recognition methods based on strontium isotope analysis, belong to oil
Gas technical field of geological exploration.
Background technique
Buried carbonate hills oil-gas reservoir is the key areas of marine oil-gas exploration.Last century the seventies, Bohai Sea Gulf basin
Ground Jiyang depression is stained with the important breakthrough of the high yields well locations such as wantonly 4 well of 11 wells, Jingzhong depression, discloses China's buried carbonate hills type
The great potential of oil-gas reservoir.It is explored by decades, the multiple areas in the great basin such as China Bohai Sea Gulf, Tarim Basin, Erdos
Multiple series of strata obtain multiple high productivity fields in succession, as the Ordovician Majiagou of Bohai gulf basin, Tarim Basin Austria make pottery
Hawk mountain group and Peng Lai dam group of system etc..In recent years, as ox Dong1Jing, peace visit the successive height of 1 well, thousand 16-16 wells, 2 well of Ross
It produces, and has started the new upsurge of buried carbonate hills oil-gas exploration.
Buried carbonate hills are the carbonate formations of early stage deposition formation during anabolie, since construction is transported
It is dynamic, it is lifted and exposes earth's surface, by the weathering eluviation and corrosion of the earth's surfaces fluid such as metrical water, mixing water, and
The oil gas reservoir body with good storage and collection performance formed after the effects of superimposed structure crack；Its maximum feature is to be lifted
Degrade, the plane of unconformity being widely present in forming region: on the one hand plane of unconformity can be used as the predominant pathway of oil-gas migration；Separately
Near one side plane of unconformity, especially below plane of unconformity (predominantly in plane of unconformity lower part 0-300 meters of depth bounds)
Layer is better with underlying strata physical property than covering on plane of unconformity, is main oil gas reservoir section, such as Jingzhong depression high-yield well Shanxi 7, Shanxi
The main productive layers such as Gu 2, Shanxi Gu 6,6 wells of Soviet Union are respectively positioned in 50 meters of depth bounds of plane of unconformity or less.Therefore, accurately identification is not whole
Conjunction face is the premise and key of buried carbonate hills type oil/gas exploration.
Traditional method for judging plane of unconformity mainly has the methods of seismic recognition method, outcrop and core observation, but
It is to go deep into oil-gas exploration, the buried carbonate hills majority of shallow-layer has been found, the exploration object faced now is mostly
Deep diving mountain or concealment buried hill.This kind of buried hill buried depth is big, and construction is complicated, seismic data poor quality, it is difficult to portray；Outcrop pair
It is poorer than property；And boring sample limitation is strong, and nearby typical dust shape carbonate rock is not easy to observe plane of unconformity, along with deep
Layer-ultra-deep substantially increases the difficulty of geology identification since technical restriction and cost control, coring sample are often landwaste.
Therefore it provides a kind of buried carbonate hills plane of unconformity recognition methods based on strontium isotope analysis has become
The technical issues of this field urgent need to resolve.
Summary of the invention
In order to solve the above shortcomings and deficiencies, the purpose of the present invention is to provide a kind of carbon based on strontium isotope analysis
Carbonate Rocks buried hill plane of unconformity recognition methods.
In order to achieve the above objectives, the present invention provides a kind of buried carbonate hills plane of unconformity based on strontium isotope analysis
Recognition methods, wherein the buried carbonate hills plane of unconformity recognition methods based on strontium isotope analysis includes following step
It is rapid:
(1) core sample or chip sample of buried carbonate hills drilling well are obtained；
(2) isotope analysis is carried out to sample obtained by step (1), to obtain87Sr/86Sr ratio；
(3) obtained in step (2)87Sr/86Sr ratio is abscissa, the corresponding depth of sample described in step (1)
Degree draws cross plot according to being ordinate；
(4) buried carbonate hills plane of unconformity is identified according to drafting cross plot in step (3).
Specific embodiment according to the present invention, in the described method, because carbonate rock group structure is complicated, and vulnerable to the later period
Diagenesis transformation influences, thus need to choose can most represent with it is raw-quasi- it is being formed with the raw phase, weak micrite matrix is transformed by later period diagenesis
As laboratory sample.
Specific embodiment according to the present invention, in the described method, the rock for obtaining buried carbonate hills drilling well
Heart sample, comprising: selection rock core matrix relatively develops region, drills through powder sample using the micro- sampler drill of grade.
Specific embodiment according to the present invention, in the described method, the rock for obtaining buried carbonate hills drilling well
Heart sample, comprising: according to research needs (considering well location, layer position and specific Research Requirements) and sample characteristics of for example, select rock core base
Matter relatively develops region, drills through powder sample using the micro- sampler drill of grade.
Wherein, the micro- sampler drill of the grade is commonly called as sander, in the specific embodiment of the invention, the grade
Micro- sampler drill may be, for example, the 204 micro- sampler drill of type grade of Strong of Precision company.
Specific embodiment according to the present invention, in the described method, the rock for obtaining buried carbonate hills drilling well
Consider sample to be worth doing, comprising:
1) landwaste that can most represent target zone is selected；
2) cleaning sample, to remove the impurity including mud；
3) sample is pulverized, is sieved.
Specific embodiment according to the present invention, in the described method, the principle of selecting selected described in step 1) includes:
A) color, size are the landwaste for accounting for leading ingredient；B) there is obvious indentation on landwaste section.
Specific embodiment according to the present invention, in the described method, ultrasonic cleaning can be used in cleaning sample in step 2)
Instrument is cleaned, and is recycled agate to grind alms bowl in step 3) and is pulverized sample.
Specific embodiment according to the present invention, in the described method, sieving was 200 meshes described in step 3).
Specific embodiment according to the present invention, in the described method, to sample obtained by step (1) described in step (2)
Carry out isotope analysis, comprising: using thermal ionization isotope ratio mass spectrometer (TIMS) or more reception cup plasma mass spectrographs
Isotope analysis is carried out to sample obtained by step (1).
In the specific embodiment of the invention, isotope analysis sample used amount is usually about 200mg, carries out to sample
It further include the operation that chemical purification is carried out to the sample before isotope analysis, chemical purification operation is this field routine techniques
Means.
Specific embodiment according to the present invention, in the described method, if core sample group structure is complicated, in step (2)
It is described that isotope analysis is carried out to sample obtained by step (1), comprising: directly to carry out rock using the cup plasma mass spectrographs that receive more
The coatings by situ of heart solid sample.
Specific embodiment according to the present invention, in the described method, if core sample group structure is complicated, micro- drill sampling is tired
Difficulty, then using the coatings by situ for receiving cup plasma mass spectrograph and directly carrying out rock core solid sample, in-situ micro area more
Before analysis, need to make satisfactory test sample using slicer, wafer lapping machine etc.；The specific size of the test sample
Specification degrades pond size to test the much more used laser device lasers for receiving cup plasma mass spectrograph (MC-ICP-MS) connection
It is quasi-.
In the specific embodiment of the invention, which be may be, for example, with a thickness of 50 μm -1000 μm；Size are as follows:
0.5cm × 0.5cm-7.5cm × 2cm or 0.5cm × 0.5cm-4.5cm × 3cm cuboid sample or above-mentioned specification
Circular sample in range.
Specific embodiment according to the present invention, in the described method, if chip sample particle is larger, in step (2)
It is described that isotope analysis is carried out to sample obtained by step (1), comprising: after selecting the landwaste that can most represent target zone, to utilize bonding
Agent bonds the landwaste on a glass, makes landwaste thin slice, and the cup plasma mass spectrographs that receive is recycled directly to carry out rock more
The coatings by situ of heart solid sample.
Specific embodiment according to the present invention, in the described method, it is described select select principle include: a) color,
Size is the landwaste for accounting for leading ingredient；B) there is obvious indentation on landwaste section.
Specific embodiment according to the present invention if chip sample particle is larger, most can in the described method selecting
After the landwaste for representing target zone, the landwaste is bonded on a glass using adhesive, landwaste thin slice is made, recycles receive more
Cup plasma mass spectrograph directly carries out the coatings by situ of rock core solid sample；Before coatings by situ, need to utilize
Slicer, wafer lapping machine etc. make satisfactory test sample；The specific dimensions of the test sample is used more to test
The laser device laser for receiving cup plasma mass spectrograph (MC-ICP-MS) connection degrades subject to the size of pond.
In the specific embodiment of the invention, which be may be, for example, with a thickness of 50 μm -1000 μm；Size are as follows:
0.5cm × 0.5cm-7.5cm × 2cm or 0.5cm × 0.5cm-4.5cm × 3cm cuboid sample or above-mentioned specification
Circular sample in range.
Specific embodiment according to the present invention, in the described method, step (4) is described to be handed over according to drafting in step (3)
It can scheme to identify buried carbonate hills plane of unconformity, comprising:
Judge occur on cross plot87Sr/86The peak value of Sr ratio, if at the line of demarcation of stratum, it should87Sr/86The peak of Sr ratio
Value is obvious, then it is assumed that87Sr/86Corresponding depth bounds are the buried carbonate hills target zone at the peak value of Sr ratio
Plane of unconformity.
Buried carbonate hills are lifted exposure in advance and are degraded by weathering, leaching, and posterior settlement receives redeposition, in lithology
Upper difference is obvious, that is, has at apparent stratum line of demarcation.
Specific embodiment according to the present invention occurs on the judgement cross plot in the described method87Sr/86Sr ratio
The peak value of value, comprising: judge occur on cross plot in conjunction with sample background, geology background87Sr/86The peak value of Sr ratio.
In the specific embodiment of the invention, the sample background, geology background are that those skilled in the art can
With what is routinely obtained.
Specific embodiment according to the present invention, it is in the described method, described87Sr/86The peak value of Sr ratio obviously refers to
The peak value is 0.712-0.740.
Sr is the generally existing element of nature, and there are four types of stable isotopes:84Sr、86Sr、87Sr、88Sr, wherein87Sr is
A kind of radiogenic stable isotope, from87The radioactive decay of Rb.In actual use, main to utilize87Sr/86Sr ratio judges the presence of plane of unconformity with the variation of depth, according to as follows:
1, the residence time (about 2.5Ma) of Sr in the seawater is significantly longer than the incorporation time (about 1.6Ka) of seawater, because
And marine facies Sr element is uniform in isotopics in any epoch global range；
2、87Sr/86Sr ratio is mainly controlled by the substance source of strontium, not by isotopes fractionations such as chemistry and biologies
It influences.After Marine Carbonate Rocks are added with isomorphism with raw-quasi- Sr in seawater during the raw phase, in the later period unless there are outer
The addition of source Sr, otherwise87Sr/86Sr ratio stable for extended periods of time, it is consistent with same period sea value；
3, there are shell source Sr and curtain source Sr in the source of Sr, wherein shell source Sr is mainly derived from continent surface weathering system, curtain source
Sr is mainly derived from mid-ocean rise hydrothermal circulation system；
4, buried carbonate hills are during lifting exposure, forming plane of unconformity, due to the wind of surface weathering system
At effect, fluviation etc., a large amount of clast, such as quartz, feldspar, clay can be brought into.Sr in these crustal materials is with class
Carbonate rock mineral, such as calcite, dolomite are added with the form of picture in matter, can change the strontium isotope composition of early formation,
Increase87Sr/86Sr ratio.
It during production application, chooses sample (rock core or landwaste), obtains87Sr/86After Sr ratio, with87Sr/86The ratio of Sr
Value makees entity relationship diagram (cross plot) using depth as ordinate for abscissa.It can be judged by the peak value occurred on datagram
The presence of plane of unconformity.Marine Carbonate Rocks87Sr/86Sr ratio is generally lower, is 0.707-0.711；And near plane of unconformity
Following sample87Sr/86For Sr ratio commonly greater than 0.711, peak value is even higher up to 0.712-0.740.
Provided by the present invention should be one based on the buried carbonate hills plane of unconformity recognition methods that strontium isotope is analyzed
The method of buried carbonate hills plane of unconformity is found and differentiated to kind, is based on strontium isotope in carbonate rock formation and later period
Strontium isotope is mainly utilized not by chemistry, biological and burial diagenesis in changing rule in evolutionary process among these
The influence of process, and the rule mainly controlled by substance source.During buried carbonate hills weathering exposure, a large amount of shells
The addition of source strontium can change Strontium Isotopic Ratios, so that87Sr/86Sr becomes larger, and87Sr/86The cross plot of Sr ratio and depth
On, peak value display, to differentiate plane of unconformity.
Detailed description of the invention
Fig. 1 is the buried carbonate hills plane of unconformity that should be analyzed based on strontium isotope provided by the embodiment of the present invention 1
The concrete technology flow process schematic diagram of recognition methods；
Fig. 2 is in the embodiment of the present invention 187Sr/86The lithology of the cross plot and the cross plot of Sr and depth and ancient 4 wells of being engaged in
The contrast schematic diagram of histogram；
Fig. 3 is the plane of unconformity (dust that Tangshan Zhao Gezhuan (high mountain, Chang Mount) and Handan Feng Feng Ordovician system field section are observed
Shape limestone) and sedimentary break (breciated dolomite) schematic diagram；
Fig. 4 is ancient 4 wells of being engaged in the embodiment of the present invention 187Sr/86Sr is with change in depth and its with Fe, Sr constituent content with depth
Spend the contrast schematic diagram of variation.
Specific embodiment
In order to which technical characteristic of the invention, purpose and beneficial effect are more clearly understood, now in conjunction in detail below
Embodiment carries out following detailed description to technical solution of the present invention, but should not be understood as the limit to enforceable range of the invention
It is fixed.
Embodiment 1
A kind of buried carbonate hills plane of unconformity recognition methods based on strontium isotope analysis is present embodiments provided, it should
Method verifies having for the differentiation buried carbonate hills plane of unconformity by taking Bohai gulf basin Jingzhong depression Ordovician system buried hill as an example
Effect property, the concrete technology flow process figure of the method is as shown in Figure 1.
Jingzhong depression latter stage in the Ordovician period is influenced by caledonian movement, and region is integrally lifted out earth's surface, by the Silurian Period, mud
The Weathering And Leaching that basin is recorded more than one hundred million years degrades, and the Carboniferous Period goes up and down again receives detrital deposit, forms the plane of unconformity within the scope of the whole district.
The superstratum of plane of unconformity is Carboniferous System Benxi group, and underliing according to degrading strong and weak is Ordovician system peak peak group or horse man ditch group etc.,
It is the Main Reservoirs type and main force's target zone of Jingzhong depression buried hill type oil-gas reservoir, such as wantonly 4 well, peace visits 1 well, have a high potential.
However, the buried hill of shallow-layer is verified substantially by exploring for many years, remaining is mostly the deep diving mountain or hidden that buried depth is more than 5000m
Buried hill is covered, discovery is difficult.Therefore, judge the plane of unconformity of ORDOVICIAN CARBONATE buried hill, finding buried carbonate hills is
The heavy difficult point of lower step oil-gas exploration.
Ancient 4 wells of business are a bite buried carbonate hills prospect pits for being deployed in Jizhong Depression, and purpose of design is that exploration is difficult to understand
Pottery ware buried hill reservoirs.Due to buried depth big (being more than 5000m) and cost control, chip sample has only been taken.
1) landwaste that can most represent target zone is selected；Select principle are as follows: a) color, size are the landwaste for accounting for leading ingredient；
B) there is obvious indentation on landwaste section.
2) using ultrasonic cleaning instrument cleaning sample, to remove the impurity including mud；
3) alms bowl being ground using agate to pulverize sample, crossing 200 mesh sieve, the powder sample after taking 200mg to be sieved send strontium same position
Plain analysis room (carbonate reservoir key lab of PetroChina Company Ltd., Sr isotope analysis instrument and
Model are as follows: thermal ionization isotope ratio mass spectrometer, Triton Plus；Fe, Sr constituent content analysis instrument and model are as follows: X-fluorescence light
Spectrometer, Panalytical Axios XRF), analysis87Sr/86Sr ratio, data are as shown in table 1 below.
Table 1
According to the data in table 1, with87Sr/86Sr ratio is abscissa, is done by ordinate of depth selection87Sr/86Sr with
The cross plot of depth, and the lithological column of the cross plot and ancient 4 wells of being engaged in is compared, the lithology column of cross plot, ancient 4 wells of being engaged in
Shape figure and the effect diagram of the two comparison are as shown in Figure 2.
As shown in Figure 2, depth from shallow to deep,87Sr/86Sr ratio has 4 peak values, wherein87Sr/86The maximum position of Sr ratio
At about 5000m (4998 meters), maximum value 0.719353, and (0.711376) is decremented to slightly larger than main body background with depth
It is worth (0.709-0.710), later, with the increase of depth, there are three secondary peak values.
From comprehensive geologies analyses such as lithological columns of above data and ancient 4 wells of combination business:87Sr/86Sr ratio peak
Being worth maximum (4998~5070) is Ordovician system peak peak group and Carboniferous System Benxi group intersection, between sedimentary break 1 down, deposition
Disconnected 2 for the upper and lower horse man ditch group inside peak peak group and horse man ditch group, horse man ditch group regression high bit field when sedimentary break, and
The sedimentary break 3 of bottom is the sedimentary break of uplift (high bit field) caused by the mountain Liang Jia group advanced stage Huaiyuan movement and formation,
This, which passes through outcrop section, directly to confirm, as shown in Figure 3.
From figure 3, it can be seen that karst palaeo-weathering crust is developed with Carboniferous System Benxi group interface on Ordovician system peak peak group top,
Angle rudstone is shown as, high angle frature, wide seam development, crack is fully populated with；In addition to this, it is sent out in Ordovician system lower layer position
Existing three sets of typical breciated dolomites correspond respectively to the mountain Liang Jia group and a ditch group of getting down from horse, a ditch group of getting down from horse and the ditch that starts
It is typical sedimentary break product at the line of demarcation of group, the ditch group that starts and peak peak group.It thereby confirms Fig. 2 and utilizes the same position Sr
Judgement of the element to ancient 4 well planes of unconformity of being engaged in.
Meanwhile analyze corresponding Fe, Sr content in chip sample of being engaged in ancient 4 wells, Fe content, Sr content and87Sr/86Sr with
The relation schematic diagram of change in depth is as shown in Figure 4
Figure 4, it is seen that at plane of unconformity,87Sr/86Sr peak value and the peak value of Fe content are more consistent, and Sr
Content, which has no apparent peak value, to be occurred；And at sedimentary break, it removes a ditch group and there is a Fe in the ditch group corresponding position that starts
Outside the peak value of content occurs, other have no obvious peak value.This differentiation of explanation for plane of unconformity, strontium isotope (87Sr/86Sr)
Analytical effect more preferably, and is actually consistent.
Claims (14)
1. a kind of buried carbonate hills plane of unconformity recognition methods based on strontium isotope analysis, which is characterized in that the side
Method the following steps are included:
(1) core sample or chip sample of buried carbonate hills drilling well are obtained；
(2) isotope analysis is carried out to sample obtained by step (1), to obtain87Sr/86Sr ratio；
(3) obtained in step (2)87Sr/86Sr ratio is abscissa, the corresponding depth data of sample described in step (1)
For ordinate, cross plot is drawn；
(4) buried carbonate hills plane of unconformity is identified according to drafting cross plot in step (3).
2. the method according to claim 1, wherein the sample is micrite matrix sample.
3. the method according to claim 1, wherein the core sample for obtaining buried carbonate hills drilling well
Product, comprising: selection rock core matrix relatively develops region, drills through powder sample using the micro- sampler drill of grade.
4. the method according to claim 1, wherein the landwaste sample for obtaining buried carbonate hills drilling well
Product, comprising:
1) landwaste that can most represent target zone is selected；
2) cleaning sample, to remove the impurity including mud；
3) sample is pulverized, is sieved.
5. according to the method described in claim 4, it is characterized in that, the principle of selecting selected described in step 1) includes: a) face
Color, size are the landwaste for accounting for leading ingredient；B) there is obvious indentation on landwaste section.
6. according to the method described in claim 4, it is characterized in that, sieving described in step 3) was 200 meshes.
7. method according to claim 1-6, which is characterized in that sample obtained by step (1) described in step (2)
Product carry out isotope analysis, comprising: using thermal ionization isotope ratio mass spectrometer or the cup plasma mass spectrograph that receives to step more
Suddenly sample obtained by (1) carries out isotope analysis.
8. the method according to claim 1, wherein if core sample group structure complexity, right described in step (2)
Sample obtained by step (1) carries out isotope analysis, comprising: directly carry out rock core solid using the cup plasma mass spectrographs that receive more
The coatings by situ of sample.
9. method according to claim 1 or 4, which is characterized in that if chip sample particle is larger, institute in step (2)
It states and isotope analysis is carried out to sample obtained by step (1), comprising: after selecting the landwaste that can most represent target zone, utilize adhesive
On a glass by landwaste bonding, landwaste thin slice is made, the cup plasma mass spectrographs that receive is recycled directly to carry out rock core more
The coatings by situ of solid sample.
10. according to the method described in claim 9, it is characterized in that, the principle of selecting selected includes: a) color, size
For the landwaste for accounting for leading ingredient；B) there is obvious indentation on landwaste section.
11. the method according to claim 1, wherein step (4) is described according to drafting cross plot in step (3)
Identify buried carbonate hills plane of unconformity, comprising:
Judge occur on cross plot87Sr/86The peak value of Sr ratio, if at the line of demarcation of stratum, it should87Sr/86The peak value of Sr ratio is bright
It is aobvious, then it is assumed that87Sr/86Corresponding depth bounds are the not whole of the buried carbonate hills target zone at the peak value of Sr ratio
Conjunction face.
12. according to the method for claim 11, which is characterized in that occur on the judgement cross plot87Sr/86Sr ratio
Peak value, comprising: judge occur on cross plot in conjunction with sample background, geology background87Sr/86The peak value of Sr ratio.
13. method according to claim 11 or 12, which is characterized in that described87Sr/86The peak value of Sr ratio obviously refers to
The peak value is greater than 0.711.
14. according to the method for claim 13, which is characterized in that described87Sr/86The peak value of Sr ratio obviously refers to the peak
Value is 0.712-0.740.
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