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Seismic interpretation - Fluvial Deltaic System
This document provides an overview of seismic interpretation methods for studying fluvial deltaic systems. It discusses key geological concepts, seismic data acquisition and processing methods, and techniques for structural and stratigraphic interpretation. These include identifying reflection configurations, fault geometries, channel elements, and depositional facies associated with fluvial and deltaic depositional environments through seismic horizon slicing and interpretation of prograding deltas and syndepositional features. The goal is to interpret seismic data to reconstruct the geological evolution of fluvial and deltaic systems.
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Seismic interpretation - Fluvial Deltaic System
- 1. SEISMIC INTERPRETATION - A Studyin Fluvial Deltaic System
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- 5. STRATIGRAPHY • Conformity • Unconformity •Hiatus • Interfingering Ferguson et al, 2000
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- 7. Definition • The seismicmethods measure the travel-time of acoustic waves propagating through the subsurface. The shot point is the location of the source wave and the acoustic receivers are called geophones. Source waves are generally generated by percussion mechanisms located near the ground or water surface (for example dropped weights or dynamite). Data are collected, stored, and processed in a seismograph. (www.state.nj.us) • The seismic reflection method records acoutic waves at the surface that are reflected off of subsurface stratigrphic interfaces where changes in the material density and conductive velocity of the acoustic waves are significant. (www.state.nj.us)
- 8. INTERPRETATION PHASE Data AcquistionData Processing Data Interpretation Recomendation
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- 10. SEISMIC SURVEY www.lithoprobe.com www.imcgeophysics.co.uk www.geoexplo.com AIRBORNE SURVEY LANDSURVEY www.bgs.ac.uk MARINE SURVEY SEISMIC PROFILE
- 11. SEISMIC QUALITY Davidoff etal, IPA 2001
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- 13. REFLECTION CONFIGURATION FREE/ TRANSPARENT DIVERGENT/CONVERGENT CONTINUOUSDISCONTINUOUSDISCONTINUOUS REFLECTION CONTINUITY
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- 15. DOUBLY CONVEXCONVEX DOWNWARDUNIFORM FACIES(2-D) GEOMETRY (3D FORMS) UNIT FASIES (3-D ) SHEET LENS WEDGE WEDGING CONVEX UPWARD MOUND
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- 17. HOW MANY BEDDINGWITIHIN ONE REFLECTOR? www.geology.utoronto.ca
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- 19. FAULT GEOMETRIES ANDSCHEMATIC DIAGRAM OF HYDROCARBON TRAPS Foot wall block Rotational faults Hanging wall block F.Sinistral-reverse Foot wall block G.E. Sinistral-normal Hanging wall block Oblique- slip faults Dip-slip faults Dip-slip faults B.Thrust D.Left-lateral, or sinistralA.Normal C.Right-lateral, or dextral Lowell, 1985
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- 21. WRENCH FAULT Ryacudu etal,1998
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- 24. NW SE Sub Basin SubBasin EXTENTIONAL BLOCKS Upper Pematang Lower Pematang SW NE
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- 29. 5 km 250ms •Bentuk sayapburung camar “gull wing” (cekung ke atas). •Didominasi oleh fasies chaotic. •Endapan Channel dan limpah banjir (overbank). Fawler, 2001 NS I I III II III IV IV IV V Flattening pada level SN 60 Stacking Pattern of BFF
- 30. GEOLOGICAL CONCEPT OF FLUVIALAND DELTAIC SYSTEM
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- 34. Fluvial Alluvial Plain Delta Plain DeltaFront Prodelta Shelf DELTAIC ELEMENTS AND PROCESS
- 35. Seismic view of fluvialand deltaic system
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- 38. Fachmi et al,2005 SEISMIC GEOMORPHOLOGY Horizon Slicing
- 39. Fachmi et al,2005 Horizon Slicing
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- 45. Thank you forWatching