logging in or signing up Seismic Migration tajtoj Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: Embed: Flash iPad Dynamic Copy Does not support media & animations Automatically changes to Flash or non-Flash embed WordPress Embed Customize Embed URL: Copy Thumbnail: Copy The presentation is successfully added In Your Favorites. Views: 1547 Category: Entertainment License: All Rights Reserved Like it (1) Dislike it (0) Added: January 03, 2011 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... By: tajtoj (30 month(s) ago) thnx all Saving..... Post Reply Close Saving..... Edit Comment Close By: simohero (31 month(s) ago) ver goog Saving..... Post Reply Close Saving..... Edit Comment Close By: aldaly89 (31 month(s) ago) hi how can i download this ppt? please send it to my mail email@example.com Saving..... Post Reply Close Saving..... Edit Comment Close By: jeetu143 (33 month(s) ago) hi how can i download this ppt? please send it to my mail firstname.lastname@example.org Saving..... Post Reply Close Saving..... Edit Comment Close Premium member Presentation Transcript Seismic Migration: Seismic Migration Seismic Reflection By : Muhammed hussain tajuddinContent: Content Background information - Seismic data processing Seismic Migration - What is Seismic Migration? - When is it used? - Types of Migration - Migration methods- Seismic data processing: - Seismic data processing 1-Lienear Noise Attenuation. 2-Normal move out 3-Stacking. 4-Velocity analysis. 5-Static correction. 6-MigrationSeismic Migration: Seismic Migration Migration –Moving from one place to another What is Seismic Migration? - A data-processing technique . - An image of earth structure. - A seismic reflection survey.What Migration do: What Migration do Before migration After migrationSEISMIC MIGRATION is applied in two cases :: SEISMIC MIGRATION is applied in two cases : Presence of Inclined Surface Reposition of displaced reflections that were displaced because of dip Existing of Diffracting points Remove diffraction images that may (may not) superimpose on reflectionsPresence of Inclined Surface: Presence of Inclined Surface True reflector Displaced image Of reflectorSlide 9: Incorrect reflector Image Correct reflector imageWe need the following to displace the reflecting point to its correct position :: We need the following to displace the reflecting point to its correct position : 1- dip angle ( ) 2- the horizontal distance (X) Apparent dip angle ( ) is given by tan = z ’ /x True dip angle is ( ) given by sin = z ’ /x Depth of reflecting point (z ’ ) = V 1 (t o1 -t o2 ) = V 1 t = sin -1 (V 1 t/x) z = V 1 t o cos x = V 1 t o sin Existing of Diffracting points: Existing of Diffracting points Travel paths of waves diffracted from point Q on a reflector with a vertical offset Point Q behaves as secondary source called a diffractor . Waves from the Diffractor are received at every receiver.Migration in anticlines and synclines: Migration in anticlines and synclines Synclines produce a bow-tie Anticlines broadenMODEL: MODEL Comparative Effects of 2D & 3D Seismic Data MigrationTypes of Seismic Migration: Types of Seismic Migration 1-Time migration : The geometrical relationships between seismic events on the time section.Slide 15: 2- Depth migration : generates a true depth section. Necessary when strong lateral velocity gradients .Migration methods: Migration methods - PRE-STACK MIGRATION - POST-STACK MIGRATIONPRE-STACK MIGRATION :: PRE-STACK MIGRATION : Migrate data before stacking sequence occurs. Pre-stack depth migration (PDM) Require more knowledge about subsurface velocity structure. Better resultsPOST-STACK MIGRATION :: POST-STACK MIGRATION : Seismic data is migrated after stacking sequence occurs. Basis: All data elements -Primary Reflections -Diffractions3-D post-stack time migration: 3-D post-stack time migration3-D pre-stack depth migration: 3-D pre-stack depth migrationUnmigrated seismic section : Unmigrated seismic sectionmigrated seismic section : migrated seismic sectionThank you : Thank you You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.