CN105044797A - Method for quantitatively recovering carbonate rock stratum denudation quantity - Google Patents
Method for quantitatively recovering carbonate rock stratum denudation quantity Download PDFInfo
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Abstract
The invention discloses a method for quantitatively recovering carbonate rock stratum denudation quantity, comprising steps of performing system sampling on the field outcrop and corestone, performing analysis and measurement on the conodont to form a conodont sequence, forming a complete conodont sequence plate in a research area, performing conodont sequence comparison to determine a stratum deletion region and a stratum non-deletion region, sorting out single-well GR curves of the stratum deletion region and the stratum non-deletion region, performing Fourier changing on the GR curve which has gone through the non-deletion region decomposition to carry out time-frequency transformation so as to obtain the frequency of gyration of different levels, determining gyration of various levels to determine gyration thickness of the corresponding level, determining stratum gyration number of various levels, determining complete stratum depositing time, performing calculation on the -deletion region to obtain the gyration frequency, rotation time and rotation thickness of various levels, utilizing the ratio of the non-deletion complete depositing time to the deletion region alternative level gyration time to obtain an original stratum thickness and performing difference calculation on the original stratum thickness and the current residual thickness.
Description
Technical field
The present invention relates to a kind of method of carbonate formation denudation quantitative reconstruction, belong to petroleum gas exploration engineering field.
Background technology
Compose the hydrocarbon resources deposited close to 50% of global Oil Gas reserves in the Marine source rock of the whole world, also all there is great discovery in recent China in the large marine bed in Tarim Basin, Sichuan and Erdos three, discloses the great potential of marine bed oil-gas exploration.But statistics shows that the carbonate formation of 40% exists degradation vacuity in various degree, and the degradation vacuity on stratum affects the thermal history on stratum, and then affects generation and the migration of oil gas.Simultaneously carbonate formation degrade the formation that generally can cause karst reservoir, and karst reservoir is a kind of very important oil and gas reservoir, and its distribution is by the restriction of Palaeokarst Landform, and the palaeogeomorphic Exact recovery of carbonate karst needs clear and definite Eroded Thickness.But carbonate formation erosion restoration is the great sciences problems that oil geology interface is faced at present always.
Forefathers have carried out a large amount of research and discoveries in Eroded Thickness field of recovering, and define 5 kinds of erosion restoration methods.Comprise: conventional strata antithesis, the trend analysis method based on seismic section, sedimentary ratio analysis, sonic time difference and the geologic thermometer thermal history analytical Eroded Thickness analyzed based on Sedimentary wave process.
But first three methods, all based on qualitative analysis, can not calculate Eroded Thickness accurately; And interval transit time geologic thermometer thermal history analytical approach is based on the analysis of vitrinite reflectance, in carbonate formation, general being difficult to finds vitrinite, is not therefore also suitable for carbonate formation; So current carbonate formation erosion restoration method or be non-quantitative test, or be only applicable to the Exact recovery of Clastic Stratum of Country Rocks denudation, therefore need the quantitative reconstruction method setting up carbonate formation denudation badly.
Summary of the invention
In view of the defect that above-mentioned prior art exists, the object of the invention is a kind of method proposing carbonate formation denudation quantitative reconstruction, can accurately obtain carbonate formation denudation, thus evidence and means can be provided for later stage Exact recovery carbonate karst palaeogeomorphology.
Object of the present invention is achieved by the following technical programs:
The invention provides a kind of method of carbonate formation denudation quantitative reconstruction, comprise the steps:
Step one: systematic sampling is carried out to the outcrop within the scope of study area and rock core;
Step 2: conodont analysis mensuration is carried out to the sample that step one collects, arrange the analysis of sample conodont and measure the monomer conodont obtained, form single appearing or the Conodont Sequence of individual well, and form complete in study area singlely to appear or the Conodont Sequence plate of individual well, singlely to appear complete in individual well or single appear Conodont Sequence and this study area or the Conodont Sequence plate of individual well contrasts, specify the deletion condition of study area different parts Conodont Sequence, so clear and definite lost strata district with do not lack district;
Step 3: arrange and do not lack district and the individual well GR curve in disappearance district, utilizing wavelet analysis to decompose not lacking the GR curve data of district with disappearance district respectively, removing low frequency background and high frequency noise;
Step 4: distinguish the GR curve after solution and carry out Fourier's series to not lacking and carry out time-frequency convert, obtain the frequency of all different stage cycles;
The ratio of the different frequency not lacking district's spectrum curve is contrasted with the astronomical parameter ratio of Milankovitch, determine the cycle of all different stages, frequency is periodic signal number of times in logging trace sampling interval, and the product of the sampling interval length of the inverse of each rank cycle frequency and the logging trace of this rank cycle is the cycle thickness of corresponding level;
The ratio of the cycle thickness of known formation full-thickness and corresponding level is utilized to determine not lack district's all different stage stratigraphic cycles number further;
Utilization is selected a rank stratigraphic cycles number and corresponding level cycle time product and is determined not lack complete stratum sedimentation time under this rank of district;
Step 5: all different stage cycle frequencies, cycle time and cycle thickness are calculated to disappearance district according to the computation process of step 4;
Utilize do not lack district select a rank under complete stratum sedimentation time and the ratio of disappearance this rank cycle time of district, be multiplied by the thickness of the single cycle of corresponding level, obtain denudation area original stratigraphic thickness, and do mathematic interpolation with residual thickness now and obtain Eroded Thickness.
In the method for above-mentioned carbonate formation denudation quantitative reconstruction, described study area comprises all workspaces needing to measure conodont of zone of interest Stratigraphic framework; Completely in described study area singlely to appear or the Conodont Sequence plate of individual well refers to the Conodont Sequence integrating whole study area, complete single in the whole study area of formation is appeared or the Conodont Sequence plate of individual well.
In the method for above-mentioned carbonate formation denudation quantitative reconstruction, the described ratio not lacking the different frequency of district's spectrum curve refers to the different frequency value contrast not lacking and district's spectrum curve reacts, and this value is used for the astronomical parameter ratio with Milankovitch and contrasts.The described Eroded Thickness obtained in Eroded Thickness is denudation final under selecting a rank; Can calculate one by one the well in this survey region on this basis, and then the denudation of clearly whole study area.
In the method for above-mentioned carbonate formation denudation quantitative reconstruction, in step one, when outcrop and rock core carry out systematic sampling, the outcrop profile that stratum is more complete should be selected.In sampling process, the principle that fixed range gets a sample should be followed, avoid sampling density to cause personal error not like this; Preferably, described systematic sampling is that every 0.2m gets a sample, but is not limited thereto to all systematic sampling needing the region measuring Conodont Sequence to carry out same rule.
In the method for above-mentioned carbonate formation denudation quantitative reconstruction, preferably, the sampling interval length of described logging trace is 0.125m, but is not limited thereto.
In the method for above-mentioned carbonate formation denudation quantitative reconstruction, preferably, described systematic sampling is every meter and gets 1 sample.
In the method for above-mentioned carbonate formation denudation quantitative reconstruction, preferably, described step 2 comprises:
Conodont classification is carried out to the sample collected, and each classification is analyzed, identifies and identified;
Form single appearing or the Conodont Sequence of individual well;
With reference to existing conodont standard of perfection, form complete in a study area singlely to appear or the Conodont Sequence plate of individual well according to kind;
Appear single or completely in the Conodont Sequence of individual well and study area singlely appear or the Conodont Sequence plate of individual well contrasts, specify the deletion condition of study area different parts Conodont Sequence, so clear and definite lost strata district with do not lack district.
In the method for above-mentioned carbonate formation denudation quantitative reconstruction, in step 3, utilizing wavelet analysis to decompose not lacking the GR curve data of district with disappearance district respectively, removing low frequency background and high frequency noise, noiselessness and the primary curve without low-frequency disturbance can be obtained.
In the method for above-mentioned carbonate formation denudation quantitative reconstruction, in step 4, Milankovitch parameter comprises long eccentricity cycle, short eccentrically connecting and precessional cycle or ecliptic obliquity cycle; Milankovitch parameter ratio comprises the ratio of long eccentricity cycle, short eccentrically connecting, ecliptic obliquity cycle and precessional cycle, with the cycle of the clear and definite different stage of method of contrast.
In the method for above-mentioned carbonate formation denudation quantitative reconstruction, in step 5, need to re-start calculating to disappearance district's different stage cycle frequency, cycle time and cycle thickness, because these results are subject to regional impact, can ensure that result of calculation is more accurate like this.
The method of carbonate formation denudation quantitative reconstruction provided by the invention is to set up based on conodont contrast plate; By clear and definite lost strata district with do not lack district's situation; Set out in conjunction with the analysis of GR curve high frequency sequence; Combine utilizing the qualitative result determined of conodont plate with quantitative calculating; Achieve the quantitative calculating of Eroded Thickness objectively.
The method of carbonate formation denudation quantitative reconstruction of the present invention is specially adapted to the calculating of the denudation of Marine source rock.
Outstanding effect of the present invention is:
The method of carbonate formation denudation quantitative reconstruction of the present invention, carbonate formation denudation can be calculated quickly and accurately, compared with classic method, the calculating of formation denudation is more accurate and quantitative, make to recover more accurate to the thermal history of oil-gas generation in oil-gas exploration, also contribute to the meticulous depiction of later stage to Palaeokarst Landform.Thus by the thermal history of Eroded Thickness Exact recovery oil-gas generation that obtains and carbonate karst palaeogeomorphology, can karst reservoir analysis of distribution be carried out in conjunction with diagenesis evolution, instruct the potential exploration target of karst reservoir further.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the method for embodiment of the present invention carbonate formation denudation quantitative reconstruction;
Fig. 2 is the Conodont Sequence plate that Sichuan Basin Permian System is complete;
Fig. 3 is outcrop or well Condonts zone comparison diagram in the embodiment of the present invention;
Fig. 4 does not lack district well WS1 logging trace exploded view in the embodiment of the present invention;
Fig. 5 lacks district well Y1 logging trace exploded view in the embodiment of the present invention;
Fig. 6 does not lack spectrum curve after well WS1 logging trace Fourier transform in the embodiment of the present invention;
Fig. 7 lacks spectrum curve after district well Y1 individual well logging trace Fourier transform in the embodiment of the present invention;
Fig. 8 is actual strata condition really in the embodiment of the present invention.
Embodiment
In order to there be understanding clearly to technical characteristic of the present invention, object and beneficial effect, existing following detailed description is carried out to technical scheme of the present invention, but can not be interpreted as to of the present invention can the restriction of practical range.
Embodiment
The present embodiment provides a kind of method of carbonate formation denudation quantitative reconstruction, for the recovery situation of Sichuan Basin Mao Kou group Eroded Thickness, as shown in Figure 1, comprises the steps:
(1) systematic sampling is carried out to the outcrop in the whole Sichuan Basin and rock core, select the outcrop profile that stratum is more complete, get a sample for every meter.
(2) sample collected step one carries out conodont analysis mensuration, carries out conodont classification to the sample collected, and analyzes each classification, identify and identify;
Form single appearing or the Conodont Sequence of individual well;
With reference to existing conodont standard of perfection, form complete in a study area singlely to appear or the Conodont Sequence plate of individual well according to kind, as shown in Figure 2;
Appear single or completely in the Conodont Sequence of individual well and this study area singlely appear or the Conodont Sequence plate of individual well contrasts, have a definite purpose the deletion condition of Stratigraphic framework study area different parts Conodont Sequence in interval, and then clear and definite lost strata district with do not lack district, as shown in Figure 3.
(3) with well data instance concrete in the Sichuan Basin, arrange and do not lack district and the individual well GR curve lacking district, utilizing wavelet analysis to decompose not lacking the GR curve data of district's (as shown in Figure 4) with disappearance district (as shown in Figure 5) respectively, removing low frequency background and high frequency noise.
(4) to do not lack district well WS1 decompose after GR curve carry out Fourier's series and carry out time-frequency convert, as shown in Figure 6, obtain the frequency of all different stage cycles.
To the astronomical parameter ratio of ratio and the Milankovitch of the different frequency not lacking district's spectrum curve (as reservoir rock and caprock cycle of table 1 Mao Kou group depositional stage (263.9MaB.P.) and ratio shown) contrast, determine the cycle of different stage, Mao Kou group has multiple different high frequency sequence, gets short e-value (SE)=1.00 as reference correlative value.For WS1 well when 123ka, frequency (Frequency) is periodic signal number of times in logging trace sampling interval, and logging trace sampling interval is 0.125m, therefore the inverse of each rank cycle frequency and the product of 0.125m are corresponding cycle thickness (H
avg), computing formula is such as formula shown in I:
H
avg＝0.125×SE/Frequency(Ⅰ)
Calculate when 123ka, single average cycle thickness 0.125 × 1/0.0188=6.65m under the non-deletion condition of WS1 well.
Utilize known formation full-thickness (H further
all, jointly determined by core log and well logging) with the ratio determination different stage stratigraphic cycles number (C of corresponding level cycle thickness
number), calculate according to formula II:
C
number＝H
all/H
avg(Ⅱ)
For this reason, first reading WS stratum Mao Kou group thickness is 334.5m, and then the cycle number calculating WS1 well whole Mao Kou group stratum is 334.5/6.65=50.3 cycle.
Utilize a certain (from main separation rank, be called for short and select one) rank stratigraphic cycles number (C
number) and corresponding level cycle time (C
time, read by frequency spectrum parameter) and product complete stratum sedimentation time (T under determining a certain rank
stra), calculate according to formula III:
T
stra＝C
number×C
time(Ⅲ)
For this reason, can read the single cycle corresponding time from Fig. 6 is 0.0657Ma, and then obtains the sedimentation time=50.3 × 123ka/Ma=6.18Ma on whole stratum.The numerical tabulars such as the frequency different turning interval of WS1, average cycle thickness can be set up thus, as shown in table 2 (WS1 well different turning interval corresponding frequency).
Table 1
Table 2
(5) pass through to read logging trace Fourier transform parameter to disappearance district Y1 well according to computation process similar in step (4), as shown in Figure 7.The different stage cycle frequency calculated, cycle time and cycle thickness, result is as shown in table 3.
Table 3
Utilize and do not lack complete stratum, district sedimentation time (T
stra) and the disappearance a certain rank cycle in district time ratios, be multiplied by the thickness of the single cycle of corresponding level, thus obtain denudation area original stratigraphic thickness (H
orgin), computing formula enters shown in formula IV:
H
orgin＝T
stra/C
time×H
avg(Ⅳ)
Thus obtain Y1 well primary deposit thickness and should be 6.18Ma/0.123Ma × 6.65=334.1m.
Adopt the original stratigraphic thickness (H calculating and recover to obtain
orgin) with residual thickness (H now
qh, read from log data) do mathematic interpolation and obtain Eroded Thickness (H
des), computing formula enters shown in formula V:
H
des＝H
orgin–H
qh(Ⅴ)
Based on formula V, can find Y1 well residual thickness now by log data is 186m, finally determines that the erosion sediment thickness of HB1 well is 334.1-186=148.1m., can calculate one by one the well in this region on this basis for this reason, and then the denudation in clearly whole object district.Combine with Condonts zone, implement on geologic section, specify that the strata condition of concrete disappearance, as shown in Figure 8.
Result shows, the embodiment of the present invention utilizes the conodont contrast plate and high frequency sequence contrast chart set up, can calculate carbonate formation denudation quickly and accurately.From conodont qualification plate and the analysis of logging trace high frequency sequence, contrast utilizing conodont plate and qualitatively determine the deletion condition of Stratigraphic framework and utilize the analysis of logging trace high frequency sequence quantitatively to calculate denudation to combine, by the two combination objective computation Eroded Thickness.Breach the limitation of traditional calculating carbonate formation denudation, efficiently solve Eroded Thickness in carbonatite basin and recover a difficult problem, for the Exact recovery of the recovery of basin thermal history and Palaeokarst Landform provides effective plate support.
Claims (5)
1. a method for carbonate formation denudation quantitative reconstruction, comprises the steps:
Step one: systematic sampling is carried out to the outcrop within the scope of study area and rock core;
Step 2: conodont analysis mensuration is carried out to the sample that step one collects, arrange the analysis of sample conodont and measure the monomer conodont obtained, form single appearing or the Conodont Sequence of individual well, and form complete in study area singlely to appear or the Conodont Sequence plate of individual well, singlely to appear complete in individual well or single appear Conodont Sequence and this study area or the Conodont Sequence plate of individual well contrasts, specify the deletion condition of study area different parts Conodont Sequence, so clear and definite lost strata district with do not lack district;
Step 3: arrange and do not lack district and the individual well GR curve in disappearance district, utilizing wavelet analysis to decompose not lacking the GR curve data of district with disappearance district respectively, removing low frequency background and high frequency noise;
Step 4: distinguish the GR curve after solution and carry out Fourier's series to not lacking and carry out time-frequency convert, obtain the frequency of all different stage cycles;
The ratio of the different frequency not lacking district's spectrum curve is contrasted with the astronomical parameter ratio of Milankovitch, determine the cycle of all different stages, frequency is periodic signal number of times in logging trace sampling interval, and the product of the sampling interval length of the inverse of each rank cycle frequency and the logging trace of this rank cycle is the cycle thickness of corresponding level;
The ratio of the cycle thickness of known formation full-thickness and corresponding level is utilized to determine not lack district's all different stage stratigraphic cycles number further;
Utilization is selected a rank stratigraphic cycles number and corresponding level cycle time product and is determined not lack complete stratum sedimentation time under this rank of district;
Step 5: all different stage cycle frequencies, cycle time and cycle thickness are calculated to disappearance district according to the computation process of step 4;
Utilize do not lack district select a rank under complete stratum sedimentation time and the ratio of disappearance this rank cycle time of district, be multiplied by the thickness of the single cycle of corresponding level, obtain denudation area original stratigraphic thickness, and do mathematic interpolation with residual thickness now and obtain Eroded Thickness.
2. the method for carbonate formation denudation quantitative reconstruction according to claim 1, is characterized in that: described systematic sampling is that every 0.2m gets a sample to all systematic sampling needing the region measuring Conodont Sequence to carry out same rule.
3. the method for carbonate formation denudation quantitative reconstruction according to claim 1, is characterized in that: the sampling interval length of described logging trace is 0.125m.
4. the method for carbonate formation denudation quantitative reconstruction according to claim 1, is characterized in that: described systematic sampling is every meter and gets 1 sample.
5. the method for carbonate formation denudation quantitative reconstruction according to claim 1, is characterized in that: described step 2 comprises:
Conodont classification is carried out to the sample collected, and each classification is analyzed, identifies and identified;
Form single appearing or the Conodont Sequence of individual well;
With reference to existing conodont standard of perfection, form complete in a study area singlely to appear or the Conodont Sequence plate of individual well according to kind;
Appear single or completely in the Conodont Sequence of individual well and study area singlely appear or the Conodont Sequence plate of individual well contrasts, specify the deletion condition of study area different parts Conodont Sequence, so clear and definite lost strata district with do not lack district.
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| CN106199726A (en) * | 2016-08-20 | 2016-12-07 | 山东科技大学 | Orbital period recognition methods based on wavelet transformation module maximum algorithm |
| CN106291690A (en) * | 2016-08-20 | 2017-01-04 | 山东科技大学 | Pattern the Forward Modeling is piled up on the stratum of orbital period tuning |
| CN106526679A (en) * | 2017-01-10 | 2017-03-22 | 中国石油大学(华东) | Method for recovering non-uniform erosion thickness through utilizing cycle analysis method |
| CN107870374A (en) * | 2016-09-26 | 2018-04-03 | 中国石油化工股份有限公司 | A kind of strata denudation evolution recovery method |
| CN108427141A (en) * | 2017-02-15 | 2018-08-21 | 中国石油化工股份有限公司 | A kind of method and system of the identification in sedimentary formation and extracting cycle fluctuation |
| CN108825216A (en) * | 2018-04-03 | 2018-11-16 | 中国石油天然气股份有限公司 | A kind of method in quantitative assessment carbonate gas reservoirs potentiality to be exploited area |
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| CN106019402A (en) * | 2016-05-12 | 2016-10-12 | 山东科技大学 | Method for comprehensively discriminating and verifying paleoclimatic cycle inside extremely thick coal seam |
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| CN106526679A (en) * | 2017-01-10 | 2017-03-22 | 中国石油大学(华东) | Method for recovering non-uniform erosion thickness through utilizing cycle analysis method |
| CN108427141A (en) * | 2017-02-15 | 2018-08-21 | 中国石油化工股份有限公司 | A kind of method and system of the identification in sedimentary formation and extracting cycle fluctuation |
| CN108427141B (en) * | 2017-02-15 | 2019-08-30 | 中国石油化工股份有限公司 | A kind of method and system identified in sedimentary formation with extracting cycle fluctuation |
| CN108957555A (en) * | 2017-05-19 | 2018-12-07 | 中国石油化工股份有限公司 | Sedimentation process planar periodic analysis method |
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| CN108825216A (en) * | 2018-04-03 | 2018-11-16 | 中国石油天然气股份有限公司 | A kind of method in quantitative assessment carbonate gas reservoirs potentiality to be exploited area |
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