1 Introduction to: 2 Full-wave modeling With Full-wave modeling you can model the gathers and time...
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Transcript of 1 Introduction to: 2 Full-wave modeling With Full-wave modeling you can model the gathers and time...
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a suite of interactive modeling solutions for seismic survey planning and interpretation
Introduction to:Introduction to:
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With Full-wave modelingFull-wave modeling you can model the gathers and time sections for explosive and surface sources with custom wavelet for: Rough topographyRough topography, various near-surface conditions, surface_waves, refractions, etc. Thin-layered modelsThin-layered models that are build on the basis of well-log data. Complex anisotropy:Complex anisotropy: transversally isotropic media and fracturing systems. Porous fluid-saturated mediaPorous fluid-saturated media (Gasman approximation). Also, basing on Full-wave modeling may be done: AVO analysisAVO analysis for anisotropic, porous, fluid-saturated, viscoelastic, thin-layered media. Q-factor estimationQ-factor estimation for thin-layered media by VSP and well-log data. ProcessingProcessing: post-stack, pre-stack depth and time migrations for surface and VSP data. BuildingBuilding velocity model by seismic data
time field of incident wavesAVO curve
The package also allows producing and studying:
Synthetic shotgather and wavefield snapshotsSeismic images from synthetic and real data
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Model buildingModel buildingModel buildingModel building
SyntheticSynthetic shotgathersshotgathers
SyntheticSynthetic shotgathersshotgathers
WavefieldWavefieldsnapshotssnapshots
WavefieldWavefieldsnapshotssnapshots
Arrival time Arrival time & Energy fields& Energy fields
Arrival time Arrival time & Energy fields& Energy fields
Resulting Resulting seismic imagesseismic images
Resulting Resulting seismic imagesseismic images
Velocity by Velocity by seismic dataseismic data
Velocity by Velocity by seismic dataseismic data
Interactions with the package
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Tracing waves: “Salt dome cornice model”Tracing waves: “Salt dome cornice model”
●Modelbuilder
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Creation of thin-layered model by well-logs (LAS files
Modelbuilding using raster image
Modelbuilding using data in grid formats
Modeling Engine & VizualizerModeling Engine & Vizualizer
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Approximation of user custom wavelet with Rikker wavelet
Approximation of user custom wavelet with Puzirov wavelet
What wavelets are used?What wavelets are used?What wavelets are used?What wavelets are used?
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Synthetic shotgather, which demonstrates duplex waves originated on vertical layer 80 m thickness (previous slide), at coordinate X=4000m. Legend:1 – reflections from base boundary; 2 – compressional duplex wave, reflected from nearest to the source side of a vertical layer; 3 – compressional duplex wave, reflected from a far side of a vertical layer; 4 – converted duplex wave, reflected from nearest to the source side of a vertical layer; 5 – converted duplex wave, reflected from a far side of a vertical layer; 6 – converted duplex wave, transmitted through the vertical layer; 7 – compressional duplex wave, transmitted through the vertical layer; 8 and 9 - reflected duplex waves, originated from PS-wave, which changed mode on a base boundary; 10 – transmitted duplex wave, originated on top of a vertical layer as result of incidence on it of direct compressional wave.
Modeling for development of advanced processing procedures
Modeling for development of advanced processing procedures
Scheme of origin of reflected and transmitted waves on thin vertical layer
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Effect of LVZ surface waves and uneven surface on CDP data imagingEffect of LVZ surface waves and uneven surface on CDP data imaging
Synthetic time cross-section.Synthetic time cross-section. The receiver grouping base 150 m With ellipse are shown zones of seismic image distortions caused by LVZ conditions, which erroneously could be interpreted on real data.
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Pre-stack Kirchhoff migration
(depth scale)
Pre-stack Kirchhoff migration
(depth scale)
CMP stackCMP stack
Initial modelInitial model
Seismic imaging for post-stack interpetationSeismic imaging for post-stack interpetationSeismic imaging for post-stack interpetationSeismic imaging for post-stack interpetation
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“MARMOUSI” SEGY-Modelwith ellipse is shown target “gas deposit”
“MARMOUSI” SEGY-Modelwith ellipse is shown target “gas deposit”
Modeling ofModeling of complexly built mediumcomplexly built mediumModeling ofModeling of complexly built mediumcomplexly built medium
Maxim
um
En
erg
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(E)
Maxim
um
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erg
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(E)
12Imaging without anisotropyImaging without anisotropy
Depth pre-stack migration (VWKM) taking anisotropy into account for the best possible case scenario – exact velocity model and data.
Depth pre-stack migration (VWKM) taking anisotropy into account for the best possible case scenario – exact velocity model and data.
Modeling of TTI-anisotropy and fracturingModeling of TTI-anisotropy and fracturingModeling of TTI-anisotropy and fracturingModeling of TTI-anisotropy and fracturing
13Legend: a -model; b, d – shotgather for Z- and X-component; c - AVO-dependency graph.
Modeling of AVO-effect for the flat target reflecting boundary with homogeneous upper thickness.
1 - Vp=2177 m/s Vs=888 m/s ρ =2160 kg/m3
2 - Vp=1967 m/s Vs=1312 m/s ρ =2050 kg/m3
3 - Vp=2131 m/s Vs=869 m/s ρ =2100 kg/m3
4 - Vp=2177 m/s Vs=888 m/s ρ =2160 kg/m3
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X-comp.
Z-comp.
K=K(α)
α°
MODEL
а b
cd
Receivers
AVO-modeling in conditions of thin-layered, AVO-modeling in conditions of thin-layered, anisotropic, fractured, viscous-elastic mediaanisotropic, fractured, viscous-elastic media
AVO-modeling in conditions of thin-layered, AVO-modeling in conditions of thin-layered, anisotropic, fractured, viscous-elastic mediaanisotropic, fractured, viscous-elastic media
AVO-dependency
Transmitted wave
Reflected wave
1 Product first 1 Product first successessuccesses
2 Product multiple 2 Product multiple successessuccesses
3- Product numerous 3- Product numerous failuresfailures
4- Product 4- Product OblivionOblivion
5 Reborn Product 5 Reborn Product multiple successes multiple successes
& progress& progress
6 Reborn 6 Reborn Product Product stable stable
applicationsapplications
3+ Product stable 3+ Product stable progressprogress
4+ Product stable 4+ Product stable applicationsapplications
Rev
enu
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TimeTime
0 Product initial 0 Product initial developmentdevelopment
Product/Site TypicalProduct/Site Typical Development & Revenues time curveDevelopment & Revenues time curve
++ via modeling and testingvia modeling and testing; ; - - via via trial-and-error methodtrial-and-error method
Why you need Full-wave modeling in seismic …Why you need Full-wave modeling in seismic …Why you need Full-wave modeling in seismic …Why you need Full-wave modeling in seismic …
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Tesseral-Pro : Modeling solutions forTesseral-Pro : Modeling solutions for 2D & 3D seismic surveysTesseral-Pro : Modeling solutions forTesseral-Pro : Modeling solutions for 2D & 3D seismic surveys
“Tesseral Pro” provides improved thin-layer model building on the base of collected well log information, utilizes complex well information including well logs, their interpretation, strata boundaries, well coordinates and inclinometer data about the well geometry. “Tesseral Pro” can be used for graphical document design compound from sections, surfaces, 3D plots, seismograms and seismic sections, text fields, pictures, etc.
Improved thin-layer 3D model building …Improved thin-layer 3D model building …
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3-D visualization of seismic files, wells and horizons.
Time field based 2-D anisotropic ray tracing modeling in addition to the finite-difference modeling methods. One time reflected waves ray tracing supports both compressed and converted waves on the base of time fields.
Time field based 2-D anisotropic ray tracing modeling in addition to the finite-difference modeling methods. One time reflected waves ray tracing supports both compressed and converted waves on the base of time fields.
Ray-tracing as interpretational tool
2-D, 2.5-D and 3-D gathers, depth migrated cubes and sections, velocity cubes can be shown either by traces or more sophistically by their vertical sections, horizontal section and sections along a horizon map
Tesseral-Pro : Modeling solutions forTesseral-Pro : Modeling solutions for 2D & 3D seismic surveysTesseral-Pro : Modeling solutions forTesseral-Pro : Modeling solutions for 2D & 3D seismic surveys
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• Full-wave modeling is a tool for improving the quality and reliability improving the quality and reliability of the interpretation of seismic surveysof the interpretation of seismic surveys. It is particularly helpful for planning acquisition parameters, fine-tuning of the processing sequence...
• Full-wave modeling may be especially helpful for interpreters working working with seismic record dynamicswith seismic record dynamics, i.e. AVO analysis, multi-component acquisition (polarized seismic prospecting) ...
• Full-wave modeling allows consistently analyze characteristics of consistently analyze characteristics of seismic records for complexly structured geological mediaseismic records for complexly structured geological media including: thin- and sub-vertical layering, abrupt velocity changes in all directions, anisotropy and fracturing systems…
• TesseralTesseral is easy to use visual learning toollearning tool. It can help geoscientists in developing and testing seismic processing procedures and testing seismic processing procedures and sequencessequences, to better understand wave phenomena in geological media and the specifics of the seismic exploration methods, and to present present results in visual and consistent form results in visual and consistent form for decision-making…