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Seismic acquisition
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- 2. Reconnaissance Structural /Stratigraphic Anomalies Primary Production/Pool Development Reservoir Delineation Prospect Generation/Exploratory Well 4D Seismic/Pool Development ROLE OF SEISMIC SURVEYROLE OF SEISMIC SURVEY IN ESTABLISHMENT OF AN OIL/GAS FIELDIN ESTABLISHMENT OF AN OIL/GAS FIELD Detailed Seismic Acquisition/Processing
- 3. 2D/3D SEISMIC SURVEY •OBJECTIVES • PREPARATION & PLANNING • PARAMETER SELECTION • FIELD OPERATION
- 4. OBJECTIVESOBJECTIVES • REGIONAL EXPLORATORYINVESTIGATIONS Delineation of structural and stratigraphic anomalies • PROSPECT DELINEATION To mark the depth of prospective horizon and trap closures • FIELD DEVELOPMENT To mark suitable locations for field development and for reservoir studies
- 5. PREPARATIONPREPARATION AVAILABLE BUDGET &TIME AVAILABLE DATA Geological Data Geophysical Data Other Information +
- 6. GEOLOGICAL DATAGEOLOGICAL DATA Surfacemaps Cross sections Contour maps Isopach Formation depths/thickness Lithologies Well history Wire Line Logs MAPSMAPS WELL DATAWELL DATA
- 7. GEOPHYSICAL DATAGEOPHYSICAL DATA Time/ Depth contour maps Isochorn / Isopach maps Velocity maps MAPSMAPS SECTIONSSECTIONS Field monitors Migrated / Unmigrated sections
- 8. GEOPHYSICAL DATAGEOPHYSICAL DATA Plots Maps Statictables UPHOLE / WZUPHOLE / WZ PARAMETERSPARAMETERS Recording,Drilling,Shooting,Vibrating REPORTSREPORTS
- 9. OTHER DATAOTHER DATA •Topographic Maps • Arial Photographs • Cultural Information
- 10. KEY INFORMATIONKEY INFORMATION •Depth of Target Horizon • Dip of the Target Horizon • Arial Extension of Target • Maximum Desired Frequency • Accessibility in the Area • Noise Type in the Area • Thickness of the Weathered Layer • Structural Settings of the Area • Terrain • Climate
- 11. REFLECTION FROM AHORIZONTALREFLECTION FROM A HORIZONTAL REFLECTORREFLECTOR Offset CMP Surface Reflector Source Detector
- 12. SEISMIC DATA ACQUISITIONON LANDSEISMIC DATA ACQUISITION ON LAND Shot Hole Geophones Recording Truck Seismic Waves Reflector
- 13. SEISMIC DATA ACQUISITIONIN MARINESEISMIC DATA ACQUISITION IN MARINE Hydrophones Seismic ship Seismic Waves Shot Reflector Streamer Sea surface
- 14. • 1. PLANNING& DESIGNING • 2. SURVEY • 3. DRILLING • 4. SHOOTING/VIBRATING • 5. RECORDING ACQUISITION
- 15. PLANNING & DESIGNING PARTOF OIL COMPANIES 1. ACQUISITION PARAMETERS 2. BID INVITATION a. Minimum Offset b. Maximum Offset c. Source Interval e. No. of Channels d. Receiver Interval f. Fold Coverage g. Source (Dynamite or Vibroseis)
- 16. 2D SEISMIC LINES REQUIREMENT OFTHE CONTRACTOR 1. BLOCK BOUNDARIES (CONCESSION AREA) 2. START & END COORDINATES OF THE LINE 3. ACQUISITION PARAMETERS
- 17. SCOUTING SERVICES COMPANIES GOESTO CHECK THE AREA Surface Conditions (Hilly, Plane,Bushes,Sandy,Cultivated) BIDS WITH PRICE Decision of Location of a Base Camp Decision of Source (Dynamite or Vibroseis) Physibility Report
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- 19. 50 m 50 m SURVEYPEGS PIN FLAG WOODEN PEGNOD POLE WOODEN PEG
- 20. CONCEPT OF BASESTATION
- 21. CLOSE VIEW OFBASE STATION PARMENANT MARKER GPS RECEIVER
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- 23. ROVER UNIT INSIDETHE VEHICKLE
- 24. IN LINE/CROSS LINEOFFSET INLINE OFFSET CROSS LINE OFFSET
- 25. RECEIVER AND SOURCEPARAMETER SELECTIONRECEIVER AND SOURCE PARAMETER SELECTION • SPREAD TYPE • RECEIVER LAYOUT • SOURCE TYPE
- 26. SPREAD TYPESPREAD TYPE •Symmetric Split Spread • Asymmetric Spread • End On TYPESTYPES
- 27. SYMMETRIC SPLIT SPREADSYMMETRICSPLIT SPREAD Maximum Offset Minimum Offset Minimum Offset Maximum Offset Shot pointCH 1 CH 61CH 60 CH 120 For a symmetric split spread, equal number of channels are laid out on both sides of the shot Minimum Offset: The distance between shot and very first live channel on either side of spread. Maximum Offset: The distance between shot and last live channel on either side of spread Near bin Center = Minimum Offset +( N / 2) * Group Interval fold = 1/2 x N x (group interval/source interval) where N is the total number of recording channels
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- 29. RECEIVER ARRAY DESIGNRECEIVERARRAY DESIGN Linear Array Weighted Array Parallel array G1 G2 G23 G24 G1 G12 G24G13 G1 G10 G11 G12 G13 G14 G15 G24
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- 31. CABLE & GEOPHONE LAULLink cableGEOPHONE STRING , 142 m
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- 38. LINE TAB BOX LAUXBATTERY TO RECORDER
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- 40. CABLE PLUG INTHE RECORDER FROM SPREAD
- 41. • Terrain • Accessibility •Equipment cost • Efficiency • Environmental conditions SOURCE TYPESOURCE TYPE CRITERIA FOR SOURCE SELECTION
- 42. Air Gun MARINEMARINE LANDLAND Dynamite Vibroseis SOURCETYPESOURCE TYPE
- 43. VIBROSEISVIBROSEIS • VP INTERVAL •MOVE UP • SWEEP • SWEEP LENGTH • SWEEP FREQUENCY • SWEEP TYPES • NUMBER OF SWEEPS PER VP • SOURCE ARRAY PATTERN PARAMETERS
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- 48. DYNAMITEDYNAMITE • SHOT HOLEDEPTH • CHARGE SIZE • SP INTERVAL • NUMBER OF HOLES • SHOT POINT BASE • SOURCE ARRAY PATTERN SP Interval Hole Depth Charge Size PARAMETERS
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- 51. TAPE DRIVE FORDATA RECORDER
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- 53. VIBRATOR STATUS ANDSPREAD
- 54. SPRAED POSITION ANDBAD CHANNELS SHOT BAD CHANNELS
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- 59. RAW SHOT RECORDRAWSHOT RECORD 2D: