High Resolution Seq Strat Applied to Field Development
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High Resolution Seq Strat Applied to Field Development

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High resolution seq stra applied to field development

High resolution seq stra applied to field development

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High Resolution Seq Strat Applied to Field Development High Resolution Seq Strat Applied to Field Development Presentation Transcript

  • Sequence Stratigraphic Evolution of the Oficina Formation, Eastern Venezuela Basin: Depositional Systems and Sand Body Geometry in a Non-Marine to Estuarine Environment A. T. Picarelli 1 , R.R. Savini 1 , V. Abreu 2 , S. Grosso 1 , J. Arguello 1 and D. Salas 1 (1) Perez Companc de Venezuela (2) Exxon-Mobil URC
  • Objectives
    • Develop a high-resolution seq-strat framework to support field revitalization.
    • Relate stacking patterns, sand body geometry and seismic expression to base level changes in a foreland basin distal zone.
  • Geotectonics and Paleophysiography Llanos Basin Barinas Basin Maturin Basin Guyana Craton
  • Paleophisiographical Setting Mod. from Parnauld et al. (1995) Orinoco River Mata/Acema S N Oficina/Merecure fms (Oligocene/Miocene) Mesa and Las Piedras fms (Late Mioc./Pliocene) 100 km 4 km 0 km 4 km 8 km 12 km 16 km La Pica fm (Late Miocene) Freites/Carapita fms (Late Mioceno) Collision Front Serranía del Interior Oritupano/Leona Maturin Sub - basin Shallow marine Shelf Break
  • Data Base
    • Well logs (spacing from 40 to 160 acres, basic suite SP, GR, Resistivity and Micrologs. More recently: Induction, density, neutronic, acoustic, magnetic resonance)
    • Pressure and production data
    • 2D/3D seismic data
    • Core data
  • Method
    • Stacking pattern analysis from 2nd to 5th order: Seq. Strat. Framework (well-log analysis)
    • Relationship between stacking patterns, sand body geometry (net sand maps and production data) and systems tracts
    • Seismic Expression of key surfaces, systems tracts and sand-body geometry (mapping of key surfaces; horizon slices every 2 ms and amplitude extraction).
    • Model Integration with core analysis.
  • Foredeep Cycles and Paleobatimetry
  • Seismic Expression - 2nd Order Events
  • Foredeep Cycles and High-Frequency Stacking Patterns
  • Systems Tracts and Sand-Body Geometry
    • Foredeep 1 LST (Merecure Formation and Lowermost Oficina)
    • LST Deep Incised valley fills, fluvial-dominated
    • Foredeep 1 TST (Oficina Formation)
    • LST Shallow and multi-branched incised valley fills, tidal-dominated
    • TST Littoral tidal- and wave-dominated sand ridges
    • HST Deltaic sedimentation and littoral sand ridges
  • Seismic Expression - Sequence Boundaries 30 Km Mata Oritupano -Leona Acema
  •  
  • LST fluvial-dominated Incised valley fills Net Sand Map: LST Sequence Oficina VIII (U1 Sand)
    • Channelized reservoirs.
    • South to north oriented incised valley fills (fluvial dominated). 50 to 100’ thick.
    • Trap: Updip Structural and lateral stratigraphical
    • Vertical communication due to widespread and deep erosive events.
    • Compensational stacking between 4th order LSTs.
    1000’ 30 Km Mata Oritupano -Leona Acema
  • Fluvial-dominated Incised Valley Fills Example from High-Frequency Sequence Merecure I 11471’ 11480’ 11550’ 11541’ 11520’ SB SB 11511’ 11500’ TS 11490’
  • LST tidal-dominated shallow and multi-branched incised valley fills
    • Multi-branched channelized reservoirs.
    • Mainly estuarine filling, 30-50’ thick.
    • Trap: Updip Structural and lateral stratigraphical.
    • Strong lateral compartmentalization, only local vertical communication caused by erosion between 4th order LST.
    • Compensational stacking between 5th order LSTs.
    30 Km Mata Oritupano -Leona Acema 1000’
  • High-Frequency Sequence Architecture within 3rd Order LST: Sequence Boundary and LST SB MFS SB 10589’ 10579’ 10569’ 10559’ TS/PS 10549’ 10539’ 30 ‘ PS PS PS PS Cross stratified, medium to coarse grained tidal channel sandstone, fining upward (individual sets 2 - 3 ft), water escape related structures and mud drapes eroding offshore mud.
  • High-Frequency Sequence Architecture within 3rd Order LST: Transgressive Surface SB MFS SB 10589’ 10579’ 10569’ 10559’ TS/PS 10549’ 10539’ 30 ‘ PS PS PS PS Siltstone to very fine sandstone layer strongly bioturbated (Planolites isp and Teichichnus isp), ripple cross lamination, siderite nodules overlaid by offshore mud.
  • High-Frequency Sequence Architecture within 3rd Order LST: HST Deposits/Sequence Boundary SB MFS SB 10589’ 10579’ 10569’ 10559’ TS/PS 10549’ 10539’ 30 ‘ PS PS PS PS Offshore mud bioturbated by Thallassinoides isp, with pipes filled by coarse grained sands from the overlying unit.
  • High-Frequency Sequence Architecture within 3rd Order LST: HST Deposits and Sequence Boundary Expression SB MFS SB 10589’ 10579’ 10569’ 10559’ TS/PS 10549’ 10539’ 30 ‘ PS PS PS PS Coarse grained sandstone, massive to horizontal/low angle lamination, bioturbated. Interpreted as a fluvial distributary channels, marine influenced, with sharp contact with offshore mud.
  •  
  • TST and MFS - Seismic Expression 30 Km Mata Oritupano -Leona Acema
  •  
  • TST/(HST) Littoral Sand Ridges (tidal- and wave-dominated)
    • Non-channelized reservoirs.
    • Isolated, encased in offshore mud, east-west/northwest-southeast oriented sandbodies.
    • Trap: Mainly Stratigraphical.
    • Vertical communication limited to fifth order erosional events.
    1000’ 30 Km Mata Oritupano -Leona Acema
  • TST/(HST) Deposits and Sequence Boundary Expression: Core data 30 ‘ Medium to fine grained sandstone, massive strongly bioturbated, overlying offshore mud with Thallassinoides isp. 3rd order Sequence Boundary High frequency SB and TS PS 10599’
  • HST - Seismic Expression 30 Km Mata Oritupano -Leona Acema
  • HST - Deltaic Sedimentation
  • Stratigraphical and sedimentological Model - LST Deep Incised valley fills, fluvial-dominated Distributary channels tidally influenced Distributary channels Tidal bars Overbank 2 Hydraulic Communication W E SB SB S E 1 2 4 3 N SB SB TS 1 2 3 4 5th Order Events 1 4 3
  • Stratigraphical and sedimentological Model - LST tidal-dominated Shallow incised valley fills W E S N 1 2 4 3 5 6 7 1 2 4 3 5 6 1 2 4 3 5 6 2 3 5 6 7 4 Distributary channels tidally influenced Tidal channels Tidal bars Tidal bars (distal) Transgressive surface Sand ridges 7 Offshore SB TS SB SB/TS SB/TS SB SB Hydraulic Communication 5th Order Events
  • High-resolution Sequence Architecture and Base level Change Fluvial channels Paleosoils and Crevasse splay Paleosoils, swamp and tidal flats Tidal and Channel bars or fluvial channels tidal influenced Pedogenic Profiles, swamps and tidal flats Internal and External Platform Muds and Storm Related Sands W/NW E/SE Paleosoils, swamps and tidal flats Tidal and Channel bars or fluvial channels tidal influenced Hydraulic isolated Incised valley fills Pedogenic Profiles, swamps and tidal flats
  •  
  • Stratigraphical and sedimentological Model TST/(HST) Littoral Sand Ridges (tidal- and wave-dominated) W E N S Transgressive sands (medium to fine grained sandstone, bioturbated) Offshore shale with Thallassinoides isp (Glossifungites ichnofacies) Offshore shale 1 2 3 1 2 2 SB/TS SB TS SB/TS Hydraulic Communication 5th Order Events 1 SB/TS 3 Snedden and Dalrymple, 1999 1 2 2
  •  
  • Foreland Setting and Base Level Evolution in the Mata, Acema and Oritupano Areas T Foreland Basin (Forebulge) Main Sediment Source Zona A Zona B T T S S Shallow marine Ramp-like Basin Foreland Basin - Distal Zone Zona A Zona B
  • Paleogeographical Model Atmospheric Circulation Pattern Miocene Gulf Main source of sediment supply (Guyanna Craton)
  • Conclusions
    • The second order cycle developed during the Late Oligocene/Late Middle Miocene (foreland basin) show an overall thinning and fining upward stacking pattern in the studied area.
    • The lower frequency cycles (2nd and 3rd order) controlled the higher frequency (4th and 5th orders) sand body geometry.
    • Within the third order events major reservoir development happened during the Late LST and TST (estuarine valley fill and transgressive sand ridges).
    • The predominantly retrogradational stacking pattern could be explained by the relatively distal position of the studied area in relation to the thrust belt zone.
  • Conclusions
    • The shallow marine ramp geometry trigger the development of fifth order SB, with erosion and valley cutting and LST/TST fillings.
    • The fifth order sequence boundaries allowed the communication between different reservoirs. In this way the flow units are defined by the fourth order sequences.
    • The production profiles of the sand ridges and IVF reservoirs show different patterns, in close agreement with the sequence stratigraphy model.