Detection of salt-dome boundary surfaces in migrated seismic volumes using gradient of textures Salt Dome Detection

Transcription

1 cegp.ece.gatech.edu M. Shafiq, Z. Wang, A. Amin, T. Hegazy, M. Deriche, and G. AlRegib, "Detection of salt-dome boundary surfaces in migrated seismic volumes using gradient of textures," to be presented at 2015 SEG Annual Meeting, New Orleans, Louisiana, Oct , Salt Dome Detection Center for Energy and Geo Processing (CeGP) School of Electrical and Computer Engineering Georgia Institute of Technology, Atlanta, GA, U.S.A.

2 Outline Motivation Proposed Method Overview Gradient of Texture Thresholding & Morphology Detailed Explanation Results Comparison CeGP, Georgia Tech 2

3 Outline Motivation Proposed Method Overview Gradient of Texture Thresholding & Morphology Detailed Explanation Results Comparison CeGP, Georgia Tech 3

4 Motivation Seismic Interpretation Impermeable, thus forming fuel traps Exploration Planning Drilling Layout Salt Dome Detection/Delineation CeGP, Georgia Tech 4

5 Outline Motivation Proposed Method Overview Gradient of Texture Thresholding & Morphology Detailed Explanation Results Comparison CeGP, Georgia Tech 5

6 Proposed Method Overview Seismic Volumes Computing Three Dimensional Gradient of Texture (GoT) Global Thresholding (Ostu s Method) 3D Region Growing Morphological Processing 3D Salt Dome boundary Manual Seed Point Selection CeGP, Georgia Tech 6

7 Outline Motivation Proposed Method Overview Gradient of Texture Thresholding & Morphology Detailed Explanation Results Comparison CeGP, Georgia Tech 7

8 Why Gradient of Texture? Examples showing limitations of traditional edge detectors Caprock Boundaries Detected Side Boundaries Not Detected CeGP, Georgia Tech 8

9 2D Gradient of Texture Texture Boundary Texture Region 1 Texture Region 2 Texture Gradient Is Being Computed at This Point Texture Boundary Neighborhood windows used to compute x component Sliding Directio n Neighborhood windows used to compute y component 1 st Neighborhood Window 2 nd Neighborhood Window Gradient of Texture X = Dissimilarity ( W -, W + ) dissmilarity() is a perceptual dissimilarity measure based on double DFT magnitude operator. x CeGP, Georgia Tech 9

10 3D Gradient of Texture (1) CeGP, Georgia Tech 10

11 3D Gradient of Texture (2) Cross-line direction (x) In-line direction (y) Time direction (t) CeGP, Georgia Tech 11

12 Outline Motivation Proposed Method Overview Gradient of Texture Thresholding & Morphology Detailed Explanation Results Comparison CeGP, Georgia Tech 12

13 Thresholding & Morphology Global Threshold on all volume Ostu s Method Sphere was used as structuring element CeGP, Georgia Tech 13

14 Outline Motivation Proposed Method Overview Gradient of Texture Thresholding & Morphology Detailed Explanation Results Comparison CeGP, Georgia Tech 14

15 Texture Attributes 3D Seismic Sections..... CeGP, Georgia Tech 15

16 Seismic Volume and Inline #269 CeGP, Georgia Tech 16

17 GoT Map of Inline #269 CeGP, Georgia Tech 17

18 3D Cube (11 SS) CeGP, Georgia Tech 18

19 Binary Images CeGP, Georgia Tech 19

20 Outline Motivation Proposed Method Overview Gradient of Texture Thresholding & Morphology Detailed Explanation Results Comparison CeGP, Georgia Tech 20

21 Results CeGP, Georgia Tech 21

22 3D Complete Salt Dome inline-depth, #crossline = 113 inline-crossline, #depth = 77 CeGP, Georgia Tech 22

23 3D Complete Salt Dome crossline-depth, #inline = 72 Complete Binary Volume CeGP, Georgia Tech 23

24 Salt Dome Complete CeGP, Georgia Tech 24

25 3D Salt Dome Complete crossline depth CeGP, Georgia Tech 25

26 Rear View crossline depth CeGP, Georgia Tech 26

27 Side View crossline depth CeGP, Georgia Tech 27

28 Top View crossline depth CeGP, Georgia Tech 28

29 Outline Motivation Proposed Method Overview Gradient of Texture Thresholding & Morphology Detailed Explanation Results Comparison CeGP, Georgia Tech 29

30 Comparison Inline #265 Magenta: Berthelot et al. Yellow: Aqrawi et al. Green: Proposed Method Red: Ground Truth Berthelot, A., A. H. Solberg, and L. J. Gelius, 2013, Texture attributes for detection of salt, Journal of Applied Geophysics, 88, Aqrawi, A. A., T. H. Boe, and S. Barros, 2011, Detecting salt domes using a dip guided 3D Sobel seismic attribute, Expanded Abstracts of the SEG 81st Annual Meeting, Society of Exploration Geophysicists, CeGP, Georgia Tech 30

31 Comparison Inline #269 Magenta: Berthelot et al. Yellow: Aqrawi et al. Green: Proposed Method Red: Ground Truth CeGP, Georgia Tech 31

32 Similarity CeGP, Georgia Tech 32

33 Thank you Questions!