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Finally,Īiscuss the geological aUvantages anU limitationsĮach seismic inversion roethoU,looking at examples of each.ĮF IEL D MODEL-BASED I RECURSIVEWAV TRAVELTIMEĪ summaryof current inversion techniques. These methoUs,still fairly new, allow us to extract parameters other than impedance, such as density and shear-wave velocity. Tomography,will be discussedalong with several illustrativeĪfter the discussion on poststack inversion, we shall move into the realm of pretstack. Newer sparse-spike deconvolution methods such as Maximum-likelihoodĪnother important type of inversion methodwhich will be aiscussed is model-based inversion, where a geological moael is iteratively upUatedto finU the "whitening" aleconvolutionmethods, wavelet extraction methods, and Method is on the deconvolution scheme Chosen. Which are based on single trace recursion.īetween aleconvolution anU inversion, and how Uependent each These methods are summarizedin Figure 1.2.
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Once we have an understanding of these concepts and the problems which Introduction to Seismic InverSion Methodsįigure1.1 Fo. Time and frequencydomains,consideringthe three components of this model: reflectivity,
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To understandseismic inversion, we must first processes involved therefore The relationship between forward and inverse modelling is shownin Figure 1.1. (or, in the simplest case, using a sonic log as a one-dimensional model). modelling technique, which involves creating.As such, itĬan be considered as the opposite of the forwar Which attempt to recover a broadband pseudo-acoustic impedance log from a band-1 imi tedĪnother way to look at inversion is to consider it as the technique for creating a model of the earth using the seismic data as input. Properties of the subsurface of the earth using measurementsmadeon the surface of the earth. It would therefore seemappropriate to begin by defining what is meant by seismic inversion. I NTRODUCT ION TO SEI SMIC INVERSION METHODS ,Ĭourse is intended as an overview of the current techniques used in Part 10 Amplitude versus offset (AVO) Inversion 10.1 AVO theory 10.2 AVO inversion by GLI Seismic Processing Considerati ons 4.2 Ampli rude recoveryĨ.3 Seismic1ithologic roodelling (SLIM) Appendix8-1 Matrix applications in geophysicsĩ.2 Numerical examplesof traveltime 9.3 Seismic Tomography e Sei smic Model 2.2 The Reflection Coefficient 2.3ĥ.3 Seismically derived porosity Sparse-spike Inversi onĥ.2 Information in the low frequency component 6.Thisbookor portionshereofmaynotbe reproduced in anyformwithoutpermission in writingfromthe publisher. ¸ 1988 by the Societyof Exploration Geophysicists All rightsreserved. Libraryof Congress CatalogCardNumber88-62743 Societyof Exploration Geophysicists P.O. They havenot beenexaminedfor accuracyand clarity.Questionsor commentsby the readershouldbe referreddirectlyto the author. Thesecoursenotesare publishedwithoutthe normalSEGpeerreviews. Russell Hampson-Russell SoftwareServices,Ltd.