role of layer-induced anisotropy in seismic exploration = by Johannes Henricus Hake Download PDF EPUB FB2
In this thesis we focus on anisotropy caused by fine layering. We analyse the conditions that must be satisfied so that fine layering is equivalent to anisotropy. In the long-wavelength (or quasi-static) approximation an interval of thickness H, consisting of a sequence of layers, is effectively homogeneous and anisotropic to seismic wave.
In this thesis we focus on anisotropy caused by fine layering. We analyse the conditions that must be satisfied so that fine layering is equivalent to anisotropy. In the long-wavelength (or quasi-static) approximation an interval of thickness H, consisting of a sequence of layers, is effectively homogeneous and anisotropic to seismic wave Cited by: 2.
The role of layer-induced anisotropy in seismic exploration. By J.H. Hake. Abstract. In\ud this thesis we focus on anisotropy caused by fine layering. We analyse\ud the conditions that must be satisfied so that fine layering is equivalent to\ud anisotropy.
In the long-wavelength (or quasi-static) approximation an interval of\ud thickness H Author: J.H. Hake. Causes of Anisotropy: Periodic Fine Layering. Simple quasi-static strain modelling. Constraints on layer-induced anisotropy. Inversion of the compound stiffnesses to constituent stiffnesses.
A nomogram for the determination of layer parameters. Appendix 9A: Generalized averages. Anisotropy and Seismic Exploration.
Elliptical anisotropy. Seismic anisotropy can result from fine-scale layering and alignment of anisotropic plate-shaped clay minerals with planes oriented approximately perpendicularly to the maximum stress direction.
This chapter will discuss seismic anisotropy of shales. Chapters 4 and 7 discussed stress-induced anisotropy and fracture-induced anisotropy, respectively. layer-induced elastic anisotropy - part 1: forward relations between constituent parameters and compound medium parameters Anisotropy of solids is due to their internal structure, and one of the simplest internal structures is "lamination", i.e., layering on a scale smaller than the wavelengths.
1 Union Texas Pakistan, 3rd Floor, Bahria Complex, 24 Moulvi Tamizuddin Khan Road, GPO Box Karachi #2 Pakistan. Phone: 92 21, ; Fax: 92 21 Understanding Seismic Anisotropy in Exploration and Exploitation: Hands on A two-day course, covering all areas of seismic anisotropy Leon Thomsen Delta Geophysics Course description All rock masses are seismically anisotropic, but we often ignore this in our seismic.
Research highlights Velocity anisotropy plays a crucial role in seismic imaging and cannot be ignored. Long-offset P-wave surface seismic data is used to estimate anisotropy in VTI-media.
Anisotropic velocity analysis has been made to estimate coefficient of anisotropy η. The anisotropic seismic image obtained is superior to its isotropic counterpart.
The anisotropic seismic image is an. In other words, seismic anisotropy, similar to seismic heterogeneity, is scale-dependent; a medium can be heterogeneous and anisotropic for a short wavelength while it is homogeneous and isotropic.
Crustal Anisotropy. Anisotropy in sedimentary layers is commonly observed in seismic exploration. As this subject is beyond the scope of this chapter, we refer to Helbig and Thomsen () for a recent and excellent review of this. We focus here on crustal anisotropy. Anisotropy has been recognized for a long time.
The early works of Bruggeman (), Riznichenko (), Postma (), Uhrig and van Melle (), Krey and Helbig (), Rytov (), Helbig) and Backus () all dealt with layer-induced anisotropy. Seismic exploration has for a long. In the well-log example discussed in this paper, the effective anisotropy is the same as the layer-induced anisotropy for depths less than m due to the absence of anisotropic shale layers and is a combination of intrinsic and induced anisotropies for depths greater than m.
Seismic anisotropy can occur in rocks that have complicated internal structures and thin layering. Wave-induced fluid flow (WIFF) is one of the major causes of elastic wave dispersion and anisotropy. For most sedimentary rocks, the parameters ε, δ, and γ are of the same order of magnitude and usually much less than In fact, in the case of weak anisotropy (described by small values (≪ 1) of ε, γ, and δ), the equations for the elastic velocities simplify applications of anisotropy in seismic data analysis are primarily based on the assumption of weak.
E-book eISBN SEG Members $67, List $ E-book Only 3D Seismic Imaging Biondo L. Biondi Seismic images are crucial to today’s exploration and reservoir monitoring. 3D Seismic Imaging (SEG Inves - tigations in Geophysics Series No. 14) presents fun-damental concepts and cutting-edge methods for imaging reflection seismic data.
The Handbook of Geophysical Exploration: Seismic Exploration therefore covers everything of interest to the field of exploration seismology. With over 30 volumes published so far and new volumes being published every year, the handbookseries covers a wide array of topics in the field.
Books; Author services. information for authors; policies & permissions; resources; user services. Sedimentary basin exploration with receiver functions: Seismic structure and anisotropy of the Dublin Basin (Ireland) Seismic anisotropy. Seismic anisotropy —. theoretical and applied aspects of seismic anisotropy, we refer the reader to the books by Helbig (), Thomsen (), Tsvankin (), and Grechka ().
2 NOTATION FOR ANISOTROPIC MEDIA One of the most critical issues in seismic data analysis for anisotropic media is a proper design of model pa-rameterization. During the past decades, the most convincing investigations of seismic anisotropy have focused on the Earth's mantle and on sedimentary areas of the crust, the first target being motivated by plate tectonic considerations, the latter one by hydrocarbon exploration.
In contrast, the anisotropy of the crystalline part of the crust has only rarely. Seismic Modeling and Wave Propagation Modeling the seismic response of individual hydraulic fracturing stages observed in a time-lapse distributed acoustic sensing vertical seismic profiling survey Gary Binder, Aleksei Titov, Youfang Liu, James Simmons, Ali Tura, Grant Byerley, and David Monk.
Bhoopendra Singh, Prantik Mandal, Upper mantle seismic anisotropy beneath the Kachchh rift zone, Gujarat, India, from shear wave splitting analysis, Journal of Earth System Science, /s,1, (). I first give a regional overview of seismic azimuthal anisotropy across the NWS using seismic exploration data.
The results show that fast polarization azimuths and maximum horizontal stress direction trends correlate across a geographical area spanning almost 2, km, which compares well with published results from earthquake seismology studies.
All rock masses are seismically anisotropic, but we generally ignore this in our seismic acquisition, processing, and interpretation. The anisotropy nonetheless does affect our data, in ways that limit the effectiveness with which we can use it, as long as we ignore it.
This book, produced for use with the fifth SEG/EAGE Distinguished Instructor Short Course, helps us understand why this. The difficulty in achieving well-to-seismic ties due to errors arising from wrong time-to-depth conversions has been as a result of ignoring anisotropy in seismic processing.
Anisotropy plays a vital role in the processing and interpretation of seismic data. In this work, an inversion method based on the elastic stiffness tensors was adopted to estimate and quantify anisotropy in two depobelts.
Instructor: Mr Jan de Bruin (Project Manager - Seismic Acquisition). Existing courses and books with the title `seismic acquisition' typically deal with designing seismic surveys. Although I treat design in a somewhat less conventional way, it is an important part of this course too, but other equally important subjects receive equal attention.
Abstract. Geological fractures play an important role in hydrocarbon exploration and recovery. In order to enhance the geophysical prediction of the fracture distribution, and to accurately estimate all of the medium properties related to fractures in the reservoir, the fracture characterizations and the fracture representations in seismic data are needed to be understood inevitably.
Observations of seismic anisotropy within the upper mantle and middle-lower crust may be fundamental to the understanding of plate and intra-plate tectonics (Owens and Bamford, ).
Therefore the following discussions focus on outlining the relation between tectonic history of the study area and the retrieved orientations of seismic anisotropy.
Foundations of Anisotropy for Exploration Seismics (Handbook of Geophysical Exploration: Seismic Exploration) [Helbig, K.] on *FREE* shipping on qualifying offers. Foundations of Anisotropy for Exploration Seismics (Handbook of Geophysical Exploration: Seismic Exploration).
seismic anisotropy, we refer the reader to the books by Helbig ,Thomsen ,Tsvankin ,andGrechka NOTATION FOR ANISOTROPIC MEDIA One of the most critical issues in seismic data analysis for aniso-tropic media is a proper design of model s the stiffness coefﬁcients c ij are convenient to use in forward-mod.
Seismic anisotropy of the D00 layer induced by () deformation of post-perovskite Xiang Wu1, Jung-Fu Lin2, Pamela Kaercher3, Zhu Mao4, Jin Liu2, Hans-Rudolf Wenk5 & Vitali B. Prakapenka6 Crystallographic preferred orientation (CPO) of post-perovskite (Mg,Fe)SiO 3 (pPv) has been.Intrinsic and layer-induced vertical transverse isotropy Andrey Bakulin⁄ INTRODUCTION Anisotropy caused by ﬁne layering is often considered re-sponsible for the differences between velocities obtained in sonic-log and seismic experiments.
Understanding the link be-tween the two is critical, especially in the current era of most. In this study, we constrained the seismic anisotropy patterns (i.e., the variation of seismic velocities with propagating directions) in the upper mantle beneath the backarc regions of Java‐Banda and Philippines located in Southeast Asia by analyzing the fast polarization directions of sS wave.
It is generally believed that the mantle seismic anisotropy is mainly caused by the.