CN106094030A - A kind of method by seismic profile quantitative reconstruction lake basin maximum paleao-water depth - Google Patents
A kind of method by seismic profile quantitative reconstruction lake basin maximum paleao-water depth Download PDFInfo
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- 239000004575 stone Substances 0.000 claims abstract description 26
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- 238000005056 compaction Methods 0.000 claims abstract description 7
- 238000010586 diagram Methods 0.000 claims abstract description 5
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- 239000004576 sand Substances 0.000 description 3
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- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
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Abstract
The invention discloses a kind of method by seismic profile quantitative reconstruction lake basin maximum paleao-water depth, comprise the following steps: (1) finds 3-D seismics section deltaic progradation catoptric arrangement, demarcate top, bottom interface time t1、t2；(2) top, bottom interface time are converted into corresponding top, bottom interface depth H by time and depth transfer scale1、H2；(3) thickness h of average sandstone in statistics 3-D seismics section foreset bed1Thickness h with average mud stone2(4) diagram method or laboratory method is used to ask for the compacting rate K of sandstone respectively1Compacting rate K with mud stone2；(5) before compaction occurs, the thickness h of sandstone10=h1/(1‑K1), the thickness h of mud stone20=h2/(1‑K2), stratum gross thickness h before compacting0=h10+h20；I.e. in the delta deposit phase, lake basin paleao-water depth thickness is h0, and lake basin maximum paleao-water depth h >=h now0.The present invention can be with quantitative reconstruction earth history terrestrial lake basin in period maximum paleao-water depth, and result of calculation is true and reliable and has uniqueness.
Description
Technical field
The invention belongs to technical field of geological exploration, concretely relate to one and utilize 3-D seismics section quantitative reconstruction
The method of terrestrial lake basin earth history maximum in period paleao-water depth.
Background technology
Paleao-water depth is that ancient sea level is recovered and the important research content of basin analysis, but quantitatively determines paleao-water depth at present and also locate
In the stage of fumbling.Foreign scholar mainly uses the method sxemiquantitative such as extinct plants and animal, geochemistry, seismology and mathematical modelling true
Dinghai phase carbonate platform and delta paleao-water depth, as (1991) such as Chappell and Lawrence (1993) pass through C14And U-
Th method has been inquired into the depth of water of HuonPeninsula coral reef, sea level and glacier over more than 10000 year and has been melted sea level changes；Bard etc.
(1996) year and C-O Isotope Research BarbadosTahiti barrier and sea water advanced change are surveyed by U-Pb；Juan etc.
(2000) inquire into the Sierra del Cuera carbonate platform margin slope gradient and the depth of water by field section, lead to the most again
Cross research of appearing find Cantabrian Zone carbonate platform margin slope " Sigmoidal " shape progradational configuration and determine tiltedly
Slope depth of water 500m～550m；Christopher etc. (2002) find Jamaica organic reef maximum water depth by biome burrow
Up to 30m, paleao-water depth and sea level variability were also done research by many scholars afterwards.Terrestrial lake basin paleao-water depth is recovered, state
Interior scholar mainly combines the methods such as mathematical statistics and obtains with formation thickness, extinct plants and animal differential degree.The most conventional research, no matter
Being marine facies or Continental Facies Stratigraphy, the determination method of paleao-water depth not only has multi-solution but also lack reliability.
In sum, need badly a kind of can the method for paleao-water depth in quantitative reconstruction sedimentary basin earth history period, make meter
Calculate result the most accurate but also unique, in order to lay the foundation for basin analysis and oil and gas resource evaluation.
Summary of the invention
Based on above-mentioned technical problem, the present invention provides a kind of side by seismic profile quantitative reconstruction lake basin maximum paleao-water depth
Method.
The adopted technical solution is that:
A kind of method by seismic profile quantitative reconstruction lake basin maximum paleao-water depth, comprises the following steps:
(1) fine dissection study area 3-D seismics section, finds deltaic progradation catoptric arrangement, then to deltaic progradation
Catoptric arrangement top, bottom interface are labeled, and demarcate top, bottom interface time t1、t2；
(2) according to the deltaic progradation catoptric arrangement top demarcated in step (1), bottom interface time, by time and depth transfer mark
Chi is converted into corresponding top, bottom interface depth H1、H2, 3-D seismics section intermediate cam continent foreset layer thickness H0=H2-H1；
(3) thickness h of average sandstone in statistics 3-D seismics section foreset bed1Thickness h with average mud stone2, 3-D seismics
Section intermediate cam continent foreset layer thickness H0=h1+h2；
(4) diagram method or laboratory method is used to ask for the compacting rate K of sandstone respectively1Compacting rate K with mud stone2；
(5) to the caliper recovery before sandstone and mudstone compacting, before compaction occurs, the thickness h of sandstone10=h1/
(1-K1), the thickness h of mud stone20=h2/(1-K2), stratum gross thickness h before compacting0=h10+h20；I.e. in the delta deposit phase,
Lake basin paleao-water depth thickness is h0, and lake basin maximum paleao-water depth h >=h now0。
In step (1): described deltaic progradation catoptric arrangement can lack topset and bottomset, but before must having significantly
Lamination.
The most above-mentioned deltaic progradation layer has obvious S type progradational reflection configuration.
In step (1): owing to accretion direction, delta may be different from seismic survey lines direction, so will be by crossing well profile
Or any direction section multi-direction extraction information, excavate and can the section of actual response maximum water depth conduct a research.
In step (2): time and depth transfer scale is obtained by the VSP data of well, artificial synthesized E-selectin mode.
The inventive method is particularly suited for Braided-river Deltas, meandering stream delta deposition and fan delta deposition.
The method have the benefit that:
The present invention is by the THICKNESS CALCULATION to 3-D seismics section deltaic progradation layer more permissible through decompaction correction etc.
Quantitative reconstruction earth history terrestrial lake basin in period maximum paleao-water depth, result of calculation is true and reliable and has uniqueness, the method pair
In sedimentology research, hydrocarbon source rock analysis, oil and gas resource evaluation etc., there is important geological Significance.
Accompanying drawing explanation
Fig. 1 is deltaic progradation structure and depth of water relation schematic diagram；
Fig. 2 illustrates seismic profile intermediate cam continent progradational configuration.
Detailed description of the invention
The invention provides one and utilize 3-D seismics section quantitative reconstruction terrestrial lake basin earth history maximum in period Gu water
Deep method.Earth history terrestrial lake basin in period delta deposit has the feature substantially piled up forward, is experiencing very long burying
After hiding compacting, the seismic profile along delta stacked direction has obvious progradational reflection configuration.Deltaic progradation is anti-
Penetrating architectural feature is that topset, foreset bed and bottomset structure are obvious, and on seismic profile, deltaic progradation layer has significantly
" S type " progradational reflection configuration, the deltaic progradation layer thickness of deposition phase is approximately equal to the depth of water at that time, and the flood of lake basin now
Deep at least above this depth of water, therefore can by seismic profile progradational reflection configuration inverting earth history terrestrial lake basin in period
Big paleao-water depth.But through burying with the tectonic movement such as lifting after, stratum have passed through compacting in various degree, needs corrected just to have
Meaning.The method has important geological Significance for sedimentology research, hydrocarbon source rock analysis, oil and gas resource evaluation etc..
This method is applicable to Braided-river Deltas, meandering stream delta deposition and fan delta deposition, its premise bar
Part one is the progradational reflection configuration having in seismic profile and substantially reacting delta deposit, as it is shown in figure 1, this is the present invention
Basis, two is that section deposition is deposited as master with sandstone and mud stone；Three is that study area to have corresponding drilling well and relevant well logging, record
The data such as well, in order to the parameter such as compacting rate of deep relation, sandstone and mud stone during acquisition.
Below the present invention is described in detail.
A kind of method by seismic profile quantitative reconstruction lake basin maximum paleao-water depth, specifically includes following steps:
(1) 3-D seismics section intermediate cam continent foreset bed qualitative recognition:
On the basis of knowing study area basic geology background, fine dissection 3-D seismics section, find typical triangle
Continent progradational reflection configuration (S type), such as t in Fig. 21With t2Progradational reflection configuration between line, progradational reflection configuration can lack topset and
Bottomset, but must have obvious foreset bed.Owing to accretion direction, delta may be different from seismic survey lines direction, so to lead to
Well profile or any direction section multi-direction extraction information, excavate and the section of actual response maximum water depth can carry out and grind
Study carefully, as in Fig. 2, seismic profile passes through tetra-mouthfuls of wells of A1, A2, A3 and A4.
Then, in the time domain seismic profile chosen, deltaic progradation catoptric arrangement top, bottom interface are labeled, as
Fig. 2 demarcates top, bottom interface time t1、t2, record is TWT accordingly.
(2) primary Calculation deltaic progradation layer thickness:
According to the deltaic progradation catoptric arrangement top demarcated in step (1), bottom interface time, turned by time and depth transfer scale
Change corresponding top, bottom interface depth H into1、H2, 3-D seismics section intermediate cam continent foreset layer thickness H0=H2-H1.Time and depth transfer mark
Chi is obtained by modes such as the VSP data of well, artificial synthesized E-selectin.
(3) sandstone and the thickness of mud stone in deltaic progradation layer are determined:
From even well geologic section, time on the basis of deep relation demarcates, flat in statistics even well geologic section foreset bed
All thickness h of sandstone1Thickness h with average mud stone2, from step (2), 3-D seismics section intermediate cam continent foreset bed thickness
H0=h1+h2.In this step, on the one hand assume seismic profile only exists sandstone and mud stone, on the other hand at statistical average sand
During the thickness of rock and mud stone, step (2) calculated H0Can be as qualifications, the thickness h to the average sandstone of statistics1With
The thickness h of average mud stone2Carry out a certain degree of calibration, improve the thickness h of average sandstone1Thickness h with average mud stone2System
The accuracy of meter result.
(4) sandstone determines with mudstone compacting rate:
Owing to sandstone is different with the compacting rate of mud stone under same Conditions of Buried Depth, the compacting rate of sandstone therefore should be asked for respectively
K1Compacting rate K with mud stone2.The method asking for compacting rate has two kinds:
A diagram method:
In base and Qi Lin Gary peace (Xu Huai great, 1984 translation) formulated the compacting system of sandstone and mud stone under different buried depth
Number, for depth H=(H1+H2)/2, sandstone compaction rate K1, mudstone compacting rate K2。
B laboratory method:
Sandstone embryo deposit porosity value ΦSand 0=20.91+22.9/S0, wherein: ΦSand 0Archioporus when depositing for sandstone
Porosity, S0Sorting coefficient (Scherer, 1987) for sandstone；Mud stone embryo deposit porosity is temporarily without computing formula, empirically
Value definition ΦMud 0=70%.
Choose drilling well target zone Sandstone Cores, do grain size analysis test and draw and averagely sort coefficient S0 is flat, calculate sandstone average
Initial porosity ΦSand 0=20.91+22.9/S0 is flat。
Choosing drilling well target zone sandstone and mud stone rock core, grind thin slice respectively, basis of microscopic observation is averagely compacted Residual Pore
Porosity is designated as Φ respectivelySand is residualAnd ΦMud is residual。
So can calculate sandstone compaction rate K1=ΦSand 0-ΦSand is residual=20.91+22.9/S0 is flat-ΦSand is residual.The compacting rate of mud stone
K2=70%-ΦMud is residual。
(5) caliper recovery before sandstone and mudstone compacting:
From above step, before compaction occurs, the thickness h of sandstone10=h1/(1-K1), the thickness of mud stone
h20=h2/(1-K2), so, stratum gross thickness h before compacting0=h10+h20。
It follows that in the delta deposit phase, lake basin paleao-water depth thickness is h0, and lake basin maximum paleao-water depth h now >=
h0。
Below by concrete application example, the invention will be further described.
As a example by Bohai gulf basin Dongying Depression Paleogene Period lake basin, 3-d seismic data set identifies Paleogene Period sand three
Central Asia section has the delta deposit of obvious progradational configuration, seismic profile intermediate cam continent progradational configuration topset correspondence time t1=
2.1s, the corresponding degree of depth is H1=2579m (is changed by time and depth transfer scale), and the bottomset correspondence time is t2=2.4s, relatively
The degree of depth answered is H2=3064m, deltaic progradation layer thickness H now0=H2-H1=485m.
The deltaic progradation layer thickness now calculated by drill cores, well logging, well-log information and above step, statistics
Deltaic progradation interval sandstone average thickness h1=203.89m, mud stone average thickness h2=281.11m.
In utilization, base and Qi Lin Gary Antu solution, try to achieve at depth H=(H1+H2Sandstone compaction rate K at)/21=0.18,
Mudstone compacting rate K2=0.35.
So try to achieve the original depth h of the front sandstone of compacting10=h1/(1-K1)=248.65, mud stone original depth h20=h2/
(1-K2)=432.48.Foreset bed gross thickness h before compacting0=h10+h20=681.13m.
The then husky three Central Asia section deposition period lake basin maximum paleao-water depth h >=681.13m of Bohai gulf basin Dongying Depression Paleogene Period.
Claims (6)
1. the method passing through seismic profile quantitative reconstruction lake basin maximum paleao-water depth, it is characterised in that comprise the following steps:
(1) fine dissection study area 3-D seismics section, finds deltaic progradation catoptric arrangement, then reflects deltaic progradation
Structure top, bottom interface are labeled, and demarcate top, bottom interface time t1、t2；
(2) according to the deltaic progradation catoptric arrangement top demarcated in step (1), bottom interface time, turned by time and depth transfer scale
Change corresponding top, bottom interface depth H into1、H2, 3-D seismics section intermediate cam continent foreset layer thickness H0=H2-H1；
(3) thickness h of average sandstone in statistics 3-D seismics section foreset bed1Thickness h with average mud stone2, 3-D seismics section
Intermediate cam continent foreset layer thickness H0=h1+h2；
(4) diagram method or laboratory method is used to ask for the compacting rate K of sandstone respectively1Compacting rate K with mud stone2；
(5) to the caliper recovery before sandstone and mudstone compacting, before compaction occurs, the thickness h of sandstone10=h1/(1-
K1), the thickness h of mud stone20=h2/(1-K2), stratum gross thickness h before compacting0=h10+h20；I.e. at delta deposit phase, lake basin
Paleao-water depth thickness is h0, and lake basin maximum paleao-water depth h >=h now0。
A kind of method by seismic profile quantitative reconstruction lake basin maximum paleao-water depth the most according to claim 1, its feature
It is, in step (1): described deltaic progradation catoptric arrangement can lack topset and bottomset, but must have obvious foreset
Layer.
A kind of method by seismic profile quantitative reconstruction lake basin maximum paleao-water depth the most according to claim 2, its feature
It is: described deltaic progradation layer has obvious S type progradational reflection configuration.
A kind of method by seismic profile quantitative reconstruction lake basin maximum paleao-water depth the most according to claim 1, its feature
Be, in step (1): owing to accretion direction, delta may be different from seismic survey lines direction, thus will by cross well profile or
Any direction section multi-direction extraction information, excavates and can the section of actual response maximum water depth conduct a research.
A kind of method by seismic profile quantitative reconstruction lake basin maximum paleao-water depth the most according to claim 1, its feature
It is, in step (2): time and depth transfer scale is obtained by the VSP data of well, artificial synthesized E-selectin mode.
A kind of method by seismic profile quantitative reconstruction lake basin maximum paleao-water depth the most according to claim 1, its feature
It is: the method is applicable to Braided-river Deltas, meandering stream delta deposition and fan delta deposition.
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| CN106405677A (en) * | 2016-11-17 | 2017-02-15 | 东北石油大学 | Method for quantitative calculation of water body depth of basin in deposition stage through field outcrop profile |
| CN106437690A (en) * | 2015-08-07 | 2017-02-22 | 中国石油天然气股份有限公司 | Braided river delta facies three-dimensional space distribution determining method and device |
| CN106526689A (en) * | 2016-11-25 | 2017-03-22 | 中国石油化工股份有限公司江汉油田分公司勘探开发研究院 | Method for quantitatively recovering lake basin ancient water depth |
| CN107991714A (en) * | 2017-11-28 | 2018-05-04 | 中国海洋石油集团有限公司 | The quantitative approach recovered based on lake basin paleotopography |
| WO2018145557A1 (en) * | 2017-02-08 | 2018-08-16 | 长江水利委员会长江科学院 | Method for digital restoration of historic morphology of river |
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| CN110320567A (en) * | 2018-03-28 | 2019-10-11 | 中国石油化工股份有限公司 | A kind of method of fast quick-recovery carbonate platform paleao-water depth |
| CN110850505A (en) * | 2019-10-17 | 2020-02-28 | 中国石油集团长城钻探工程有限公司 | Shale pencil stone belt division model establishing method and shale pencil stone belt division method |
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| CN114624775A (en) * | 2020-12-11 | 2022-06-14 | 中国石油化工股份有限公司 | Comprehensive quantitative restoration method for ancient water depth of sedimentary lake basin |
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| CN106405677A (en) * | 2016-11-17 | 2017-02-15 | 东北石油大学 | Method for quantitative calculation of water body depth of basin in deposition stage through field outcrop profile |
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| WO2018145557A1 (en) * | 2017-02-08 | 2018-08-16 | 长江水利委员会长江科学院 | Method for digital restoration of historic morphology of river |
| CN109541684A (en) * | 2017-09-21 | 2019-03-29 | 中国石油天然气股份有限公司 | Strata in sedimentary basins Evolution analysis method |
| CN107991714A (en) * | 2017-11-28 | 2018-05-04 | 中国海洋石油集团有限公司 | The quantitative approach recovered based on lake basin paleotopography |
| CN110320567A (en) * | 2018-03-28 | 2019-10-11 | 中国石油化工股份有限公司 | A kind of method of fast quick-recovery carbonate platform paleao-water depth |
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| CN111766630A (en) * | 2020-07-02 | 2020-10-13 | 中国地质大学（北京） | Restoration method for ancient landform of basin |
| CN113970796A (en) * | 2020-07-23 | 2022-01-25 | 中国石油化工股份有限公司 | Method for accurately recovering ancient water depth of sedimentary basin |
| CN114624775A (en) * | 2020-12-11 | 2022-06-14 | 中国石油化工股份有限公司 | Comprehensive quantitative restoration method for ancient water depth of sedimentary lake basin |
| CN114624775B (en) * | 2020-12-11 | 2023-04-07 | 中国石油化工股份有限公司 | Comprehensive quantitative restoration method for ancient water depth of sedimentary lake basin |
| CN113777657A (en) * | 2021-09-07 | 2021-12-10 | 中国石油大学(华东) | Slope area well-connected profile seismic facies characterization industrialization process based on differential compaction recovery |
| CN113777657B (en) * | 2021-09-07 | 2023-10-17 | 中国石油大学(华东) | Slope zone well-connected profile seismic phase characterization industrialization flow based on differential compaction recovery |
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