1 Introduction to: 2 Full-wave modeling With Full-wave modeling you can model the gathers and time sections for explosive and surface sources with custom.

1

a suite of interactive modeling solutions for seismic survey planning and interpretation

Introduction to:Introduction to:

2

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

3

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

4

Tracing waves: “Salt dome cornice model”Tracing waves: “Salt dome cornice model”

●Modelbuilder

5

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

6

7

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?

8

1

2

3

4 5

6

7

89

100

0.8

1.2

1.6

2.0

2.4

2.8

0.4

-500 0 500 1000 1500 2000 2500 3000 3500 45004000 5000 5500

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

9

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.

10

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

11

“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

y

(E)

Maxim

um

En

erg

y

(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

-

-

-

-

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

esR

even

ues

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 …

15

2640

2650

2630

2710

2720

2700

2690

2680

2670

2660

2650

2640

2670

2670

2660

2660

2630

2680

2680

26902690

2012656.2

2162712.4

217фу2692.6

2182689.9

2192686.6

232

2332692.2

2342675.6

2352672.5

2492646.8

2532685.3

2542649.9

2552649.5

2562652.8

2712659.1

2722680.4

2752689.9

2762653.4

203 204

205

220

236

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 …

16

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

17

• 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…