Presentation on theme: "Introduction to: -2D -2.5D - Pro"— Presentation transcript:
1Introduction to: -2D -2.5D - Pro a suite of interactive modeling solutions for seismic survey planning and interpretation-2D -2.5D - Pro
2What you can do with the package With Full-wave modeling you can model the gathers and time sections for explosive and surface sources with custom wavelet for:Rough topography, various near-surface conditions, surface_waves, refractions, etc.Thin-layered models that are build on the basis of well-log data.Complex anisotropy: transversally isotropic media and fracturing systems.Porous fluid-saturated media (Gasman approximation).Also, basing on Full-wave modeling may be done:AVO analysis for anisotropic, porous, fluid-saturated, viscoelastic, thin-layered media.Q-factor estimation for thin-layered media by VSP and well-log data.Processing: post-stack, pre-stack depth and time migrations for surface and VSP data.Building velocity model by seismic dataThe package also allows producing and studying:time field of incident wavesAVO curveSynthetic shotgather and wavefield snapshotsSeismic images from synthetic and real data
3Interactions with the package Model buildingArrival time& Energy fieldsResultingseismic imagesSyntheticshotgathersWavefieldsnapshotsVelocity byseismic data
7What wavelets are used?Approximation of user custom wavelet with Rikker waveletApproximation of user custom wavelet with Puzirov wavelet
8Modeling for development of advanced processing procedures 123456789100.81.21.62.02.42.80.4-5005001000150020002500300035004500400050005500G1GXVXSKRK(P1S1)(P1P1)(P1P2)(P1S2)ZvSynthetic shotgather, which demonstrates duplex wavesoriginated 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.Scheme of origin of reflected and transmitted waves on thin vertical layer
9Effect of LVZ surface waves and uneven surface on CDP data imaging Synthetic time cross-section. The receiver grouping base 150 mWith ellipse are shown zones of seismic image distortions caused by LVZ conditions, which erroneously could be interpreted on real data.
11“MARMOUSI” SEGY-Model Modeling of complexly built medium“MARMOUSI” SEGY-Modelwith ellipse is shown target “gas deposit”Maximum Energy (E)
12Imaging without anisotropy Modeling of TTI-anisotropy and fracturingDepth pre-stack migration (VWKM) taking anisotropy into accountfor the best possible case scenario – exact velocity model and data.Imaging without anisotropy
13AVO-modeling in conditions of thin-layered, anisotropic, fractured, viscous-elastic media 1 - Vp=2177 m/sVs=888 m/sρ =2160 kg/m32 - Vp=1967 m/sVs=1312 m/sρ =2050 kg/m33 - Vp=2131 m/sVs=869 m/sρ =2100 kg/m34 - Vp=2177 m/sаbMODELTransmitted waveReceiversZ-comp.Reflected wavecdα°K=K(α)X-comp.AVO-dependencyModeling of AVO-effect for the flat target reflecting boundary with homogeneous upper thickness.Legend: a -model; b, d – shotgather for Z- and X-component;c - AVO-dependency graph.
14Why you need Full-wave modeling in seismic … 4+ Product stable applications3+ Product stable progress2 Product multiple successes6 Reborn Product stable applications1 Product first successesRevenues5 Reborn Product multiple successes & progress3- Product numerous failures0 Product initial development4- Product OblivionTimeProduct/Site Typical Development & Revenues time curve+ via modeling and testing; - via trial-and-error method
15Tesseral-Pro : Modeling solutions for 2D & 3D seismic surveys Improved thin-layer 3D model building …“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.
16Tesseral-Pro : Modeling solutions for 2D & 3D seismic surveys Ray-tracing as interpretational tool3-D visualization of seismic files, wells and horizons.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 mapTime 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.
17Summary www.tesseral-geo.com Full-wave modeling is a tool for improving the quality and reliability of 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 with seismic record dynamics, i.e. AVO analysis, multi-component acquisition (polarized seismic prospecting) ...Full-wave modeling allows consistently analyze characteristics of seismic records for complexly structured geological media including: thin- and sub-vertical layering, abrupt velocity changes in all directions, anisotropy and fracturing systems…Tesseral is easy to use visual learning tool. It can help geoscientists in developing and testing seismic processing procedures and sequences, to better understand wave phenomena in geological media and the specifics of the seismic exploration methods, and to present results in visual and consistent form for decision-making…