Aerial View Eucalyi River, Peru Seismic View: 2 km Deep Meandering River.

Slides:

Advertisements

Similar presentations

Time vs Depth Migration Insensitive to v(z) model Sensitive to v(z) model Time migration uses best fit hyperbola Depth migration uses best guess moveout.

Advertisements

Processing: zero-offset gathers

Computational Challenges for Finding Big Oil by Seismic Inversion.

Stacked sections are zero offset sections

Seismic Reflection Data Processing and Interpretation A Workshop in Cairo 28 Oct. – 9 Nov Cairo University, Egypt Dr. Sherif Mohamed Hanafy Lecturer.

Imaging Multiple Reflections with Reverse- Time Migration Yue Wang University of Utah.

Depth (m) Time (s) Raw Seismograms Four-Layer Sand Channel Model Midpoint (m)

Specular-Ray Parameter Extraction and Stationary Phase Migration Jing Chen University of Utah.

Wavepath Migration versus Kirchhoff Migration: 3-D Prestack Examples H. Sun and G. T. Schuster University of Utah.

Name: Gerard Schuster Current Position: Geology & Geophysics Dept., Univ. of Utah Grad. Education: PhD Columbia Univ., 1984 Research: Exploration, Engineering,

Primary-Only Imaging Condition Yue Wang. Outline Objective Objective POIC Methodology POIC Methodology Synthetic Data Tests Synthetic Data Tests 5-layer.

Reverse-Time Migration By A Variable Grid-Size And Time-Step Method Yue Wang University of Utah.

Solving Illumination Problems Solving Illumination Problems in Imaging:Efficient RTM & in Imaging:Efficient RTM & Migration Deconvolution Migration Deconvolution.

Arbitrary Parameter Extraction, Stationary Phase Migration, and Tomographic Velocity Analysis Jing Chen University of Utah.

Migration MigrationIntuitive Least Squares Green’s Theorem.

Key Result Seismic CAT Scan vs Trenching.

Depth (m) Time (s) Raw Seismograms Four-Layer Sand Channel Model Midpoint (m)

Migration Resolution. Fresnel Zone T/2 L z z zL 2.

Midyear Overview of Year 2001 UTAM Results T. Crosby, Y. Liu, G. Schuster, D. Sheley, J. Sheng, H. Sun, J. Yu and M. Zhou J. Yu and M. Zhou.

Multisource Least-squares Reverse Time Migration Wei Dai.

Tom Wilson, Department of Geology and Geography Environmental and Exploration Geophysics II tom.h.wilson Department of Geology.

1 © 2011 HALLIBURTON. ALL RIGHTS RESERVED. VSP modeling, velocity analysis, and imaging in complex structures Yue Du With Mark Willis, Robert Stewart May.

V.2 Wavepath Migration Overview Overview Kirchhoff migration smears a reflection along a fat ellipsoid, so that most of the reflection energy is placed.

Making the Most from the Least (Squares Migration) G. Dutta, Y. Huang, W. Dai, X. Wang, and Gerard Schuster G. Dutta, Y. Huang, W. Dai, X. Wang, and Gerard.

The ray parameter and the travel-time curves P flat and P radial are the slopes of the travel time curves T-versus-X and T-versus- , respectively. While.

Geology 5660/6660 Applied Geophysics 18 Feb 2014 © A.R. Lowry 2014 For Wed 20 Feb: Burger (§ ) Last Time: Reflection Data Processing Step.

CS Math Applications Enabling technologies inspire Many applications drive U. Schwingenschloegl A. Fratalocchi G. Schuster F. BisettiR. Samtaney G. Stenchikov.

Subwavelength Imaging using Seismic Scanning Tunneling Macroscope Field Data Example G. Dutta, A. AlTheyab, S. Hanafy, G. Schuster King Abdullah University.

Migration In a Nutshell Migration In a Nutshell Migration In a Nutshell D.S. Macpherson.

Impact of MD on AVO Inversion

Theory of Multisource Crosstalk Reduction by Phase-Encoded Statics G. Schuster, X. Wang, Y. Huang, C. Boonyasiriwat King Abdullah University Science &

Prestack Migration Intuitive Least Squares Migration Green’s Theorem.

EXPLORATION GEOPHYSICS. EARTH MODEL NORMAL-INCIDENCE REFLECTION AND TRANSMISSION COEFFICIENTS WHERE:  1 = DENSITY OF LAYER 1 V 1 = VELOCITY OF LAYER.

Moveout Correction and Migration of Surface-related Resonant Multiples Bowen Guo*,1, Yunsong Huang 2 and Gerard Schuster 1 1 King Abdullah University of.

Reflection seismograms

Introduction to Seismic Reflection Imaging References: J.M. Reynolds, An Introduction to Applied and Environmental Geophysics, John Wiley & Sons,

Super-virtual Interferometric Diffractions as Guide Stars Wei Dai 1, Tong Fei 2, Yi Luo 2 and Gerard T. Schuster 1 1 KAUST 2 Saudi Aramco Feb 9, 2012.

G. Schuster, S. Hanafy, and Y. Huang, Extracting 200 Hz Information from 50 Hz Data KAUST Rayleigh Resolution ProfileSuperresolution Profile Sinc function.

Migration Velocity Analysis of Multi-source Data Xin Wang January 7,

Benefits & Limitations of Least Squares Migration W.Dai,D.Zhang,X.Wang,GTSKAUST RTM Least Squares RTM GOM RTM GOM LSRTM.

 = 0.5  j  r j (  kk’ (  m kk’ /  z) 2  m ii’ =  j  r j  r j /  m ii’ + (  kk’  m kk’ /  m ii’  m kk’ /  z) (1) m 11 m 12.

The acoustic Green’s function in 3D is the impulsive point source response of an acoustic medium. It satisfies the 3-D Helmholtz equation in the frequency.

Geology 5660/6660 Applied Geophysics 12 Feb 2016

Lee M. Liberty Research Professor Boise State University.

The acoustic Green’s function in 3D is the impulsive point source response of an acoustic medium. It satisfies the 3-D Helmholtz equation in the frequency.

Resolution. 0 km 7 km 0 km 3 km m = L d T r = [L L] m 0 km 7 km T.

Enhancing Migration Image Quality by 3-D Prestack Migration Deconvolution Gerard Schuster Jianhua Yu, Jianxing Hu University of Utah andGXT

Stacked sections are zero offset sections

Zero-Offset Data d = L o ò r ) ( g = d dr r ) ( g = d

Primary-Only Imaging Condition And Interferometric Migration

Imaging (and characterisation) of diffractors

Processing of KAUST Golf Data

SEISMIC DATA GATHERING.

Making the Most from the Least (Squares Migration)

Steepest Descent Optimization

Acoustic Reflection 2 (distance) = (velocity) (time) *

Migration Intuitive Least Squares Migration Green’s Theorem.

Overview of Multisource and Multiscale Seismic Inversion

Overview of Multisource and Multiscale Seismic Inversion

From Raw Data to an Image

PS, SSP, PSPI, FFD KM SSP PSPI FFD.

Graphical Answers Fresnel Zone Circles Shallow Window Deep Window

Migration Resolution.

Dipping layer reflection events and the common midpoint gather

EXPLORATION GEOPHYSICS

Migration Resolution.

Discussion of problems & Common midpoint gathers

Least Squares Migration

The nice looking seismic sections you’re used to seeing in text books are compiled from field data which is collected in the form of shot records. The.

Presentation transcript:

Aerial View Eucalyi River, Peru Seismic View: 2 km Deep Meandering River

Overview of Seismic Imaging Jerry Schuster KAUST

Outline Forward Acoustic ProblemForward Acoustic Problem Inverse Acoustic ProblemInverse Acoustic Problem Seismic ExperimentSeismic Experiment Seismic MigrationSeismic Migration

ZO Seismic Section Depth Time c  22 11

Monterey Optical Image Monterey Seismic Image 0 km 2 km 0 km 0.1 km

Acoustic Forward Problem Depth c 2c1 Given: d + k d = o 22 k =  c Find: d(r) Soln:  rorr)()(  g  rd  )(  drdr Pressure Source

Goal: Compute ZO Seismic Section Depth Time c   rorr)()(  g  rd  )(  dr  rorr)()( g  rd  )( 

Common Shot Gather Depth Time

Common Midpoint Gather DepthMidpoint Time

Normal Moveout Correction Midpoint Depth Time

Stacked Trace Midpoint Depth Time

Stacked Seismic Section Depth Time

Outline Forward Acoustic ProblemForward Acoustic Problem Inverse Acoustic ProblemInverse Acoustic Problem Seismic ExperimentSeismic Experiment Seismic MigrationSeismic Migration

What is the Problem? V/2 Depth Time Events Can Originate Updip Incorrect location. You think events originated directlybelow geophones. D=VT/2

What is another Problem? Depth Time Events Originate Pt. Diffractors

0 m 30 m 0 km 30 m corner

ZO Data Migration (Relocates Reflections back to Place of Origin) 0 km 7 km 0 km 3 km

Given: d = Lo Seismic Inverse Problem Find: o(x,y,z) Find: o(x,y,z) Soln: min || Lo-d || Soln: min || Lo-d ||2 o = [L L] L d T T‘ L d L dT migration waveforminversion

Outline Forward Acoustic ProblemForward Acoustic Problem Inverse Acoustic ProblemInverse Acoustic Problem Seismic ExperimentSeismic Experiment Seismic MigrationSeismic Migration

2-way time (x-x ) + y 22.5 c s rsrsrsrs =  rsrsrsrs + T o ZO Migration ZO Migration Smear Reflections along Fat Circles Smear Reflections along Fat Circlesxs r d(x, )  rsrsrsrs s

2-way time ZO Migration ZO Migration Smear Reflections along Fat Circles  rsrsrsrs d(x, ) s  x & Sum

2-way time ZO Migration ZO Migration Smear Reflections along Circles  rsrsrsrs d(x, ) s  r & Sum

ZO Migration Resolution ZO Migration Resolution Intersection of Fresnel Zones Vertical Res. = Near-Offset Traces

ZO Migration Resolution ZO Migration Resolution Intersection of Fresnel Zones Horiz. Res. = Far-Offset Traces

Why is Pt. Scatterer Response of Migration Why is Pt. Scatterer Response of Migration a Blurred Version of Point? Migration: m = L d TMigratedSectionData but d = L r L rL rL rL r Migration Section = Blured Image of r

Seismic Section Time 12 km

0 km 7 km 0 km 3 km

0 km 7 km 0 km 3 km Migration Least Squares Migration

Seismic Imaging Course Kirchhoff & Beam MigrationKirchhoff & Beam Migration Phase Shift-Like MethodsPhase Shift-Like Methods Reverse-Time MigrationReverse-Time Migration Full Waveform InversionFull Waveform Inversion