Maraon Basin Block E

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Marañon Basin Block E
Marañon Basin Block E-04
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Marañon E-04 Location Map

• Block Configuration - 6980 Km2
• Located between the production of Chambira Este
  Field to the north and Yanayacu Field to the
  south
• The pipeline runs from east to west along the
  southern boundary of the block
• 6 Wells drilled on the Block
• Cuinico Sur and Norte may have been poorly
  located with respect to the structures being
  tested
• Diana Mae and Santa Marta drilled on subtle and
  questionable structures

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Marañon E-04 Regional Composite Seismic Line
U. Tert Mks

• Eastward truncation of undifferentiated Lower
  Mesozoic sequence
• Preserved Paleozoic section in the easternmost
  potion of the block
• Reversal of Pozo to U. Tertiary paleo-structures
  into present day lows and visa versa

Pozo Mks
Chonta Lmst
Paleozoic
Base Cret
L.Mesozoic
Basement?
Basement
U. Tert Mks
Pozo
Chonta Lmst
Base Cret
Paleozoic
L.Mesozoic
Basement?
Basement
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Marañon E-04 Regional Block Maps

• The Marañon Basin hingeline along which most of
  the oil production in the Basin has been found,
  dissects the block into two provinces the
  shallower eastern platform and the beginning of
  the western deep Basin (foredeep)
• Source rock Pucará

Base Cretaceous 2WT CI 10msec
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Marañon E-04 Regional Block Maps

• There are a number of mappable paleo-structures
  within Block E-04
• Most of these do not have any Quechua aged
  reactivation

Pozo to Base Cretaceous Isochron CI 5msec
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Marañon E-04 Oil ReMigration Story

• Yanayacu South Paleo-Structure is 574 Km2
• Vertical relief gt 20 msec.

• With breaching of accumulation in Tertiary time
  remigration of HCs into Pastococha, Yanayacu
  Majas, and Cuinico Areas
• Secondary remigration source of approximately 150
  Km2 to west of Cuinico Sur

Pozo to Base Cretaceous Isochron CI 5msec
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Marañon E-04 Oil ReMigration Story

• Yanayacu South Paleo-Structure is 574 Km2
• Vertical relief gt 20 msec.

• With breaching of accumulation in Tertiary time
  remigration of HCs into Pastococha, Yanayacu
  Majas, and Cuinico Areas
• Secondary remigration source of approximately 150
  Km2 to west of Cuinico Sur

Pozo to Base Cretaceous Isochron CI 5msec
Phillips Line 10
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Marañon E-04 Oil ReMigration Story
Line PHI-10 Flattened (above) and Normal (below)
showing the magnitude of the Paleo-Structure that
existed within the Cretaceous section during the
Early Tertiary and one of the possible
remigration routes during Late Tertiary
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Marañon E-04 Oil ReMigration Story

• Other significant Paleo-Structures appear
  probably exist in the northern portion of the
  Block
• Probably responsible for the oil charge of
  Chambira Este

Pozo to Base Cretaceous Isochron CI 5msec
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Marañon E-04 Oil ReMigration Story

• Other significant Paleo-Structures appear
  probably exist in the northern portion of the
  Block
• Probably responsible for the oil charge of
  Chambira Este
• If present oil would be available to charge
  Cuinico Norte and other yet to be defined
  prospects.
• These undefined prospects are located between the
  area defined by the Cuinico Norte, Nucuray and
  Santa Martha Wells, where there is very limited
  seismic coverage and a broadening of structural
  contours that may indicate the presence of
  additional structural culminations

Pozo to Base Cretaceous Isochron CI 5msec
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Marañon E-04 SE Prospect Area

• Prospects
• Majas
• Majas NW
• Cuinico Sur
• Cuinico Norte
• Wells
• All wells except Yanayacu Wells drilled off
  structure
• Initial Yanayacu well (DA) drilled on time
  structure but not on depth structure
• Diana Mae SW plunging nose

Cuinico N Prospect
Majas NW Prospect
Cuinico S Prospect
Majas Prospect
Pozo 2WT CI 5msec
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Marañon E-04 SE Prospect Area

• Shown with Base Cretaceous Map and closure
  outline from Pozo level
• Structural form is more or less retained at all
  levels within the Cretaceous section
• Seismic lines showing prospects, highlighted in
  yellow

Base Cretaceous 2WT CI 5msec
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Marañon E-04 Majas Majas NE Prospects
Majas NW
Majas

• Prospect structures set up by reactivation of
  older basement block faulting
• Seismic Line GW 95-Q4 showing NW-SE dip reversal
  over the Majas and Majas NW Prospects

GW 95-Q4
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Marañon E-04 SE Prospect Area

• Shown with Base Cretaceous Map and closure
  outline from Pozo level
• Structural form is more or less retained at all
  levels within the Cretaceous section
• Seismic lines showing prospects, highlighted in
  yellow

Base Cretaceous 2WT CI 5msec
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Marañon E-04 Cuinico Sur Prospect
Cuinico Sur Prospect
Cuinico Sur 1X

• Cuinico Sur 1X well drilled on west flank of the
  structure had Hydrocarbon shows in the Cetico
  sand
• Composite Seismic Line GW 95-Q2 Phillips - 6
  through the Cuinico Sur 1X Well and near the
  structural culmination of the Cuinico Sur Prospect

GW 95-Q2
Phillips - 6
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Marañon E-04 SE Prospect Area

• Shown with Base Cretaceous Map and closure
  outline from Pozo level
• Structural form is more or less retained at all
  levels within the Cretaceous section
• Seismic lines showing prospects, highlighted in
  yellow

Base Cretaceous 2WT CI 5msec
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Marañon E-04 Cuinico Norte Prospect
Cuinico Norte Prospect

• Cuinico Norte 1X well appears to have been
  drilled on west flank of the well defined fault
  bounded structure.
• Seismic Line Phillips - 4 through the Cuinico
  Norte Prospect

Phillips - 6
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Marañon E-04 A PaleoStructure an example

• Importance of Paleo-Structure (i.e. Santa Marta)
• Pozo to BC (1) minor (to no) paleo structure
  interval mapped by most Companies
• Upper Tertiary to BC (2) Santa Martha well
  present a significant structural low
• Well defined present-day structure (3)

(3) No Flattening Well defined Structure
(2) Flattening Upper Tertiary Mkr Paleo-Low
(1) Flattening Pozo Very weak to flat
Paleo-Structure
Upper Tertiary to BC Isochron
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Marañon E-04 Location Map of all Seismic
Lines colored red are available in SEGY Format
and were used for this interpretation Lines
colored Black are available as PAPER copies and
were not used for this interpretation
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Marañon E-04 Block Summary

• Block E 6980 Km2 is located on the Marañon Basin
  hingeline along which most of the oil production
  in the Basin has been found,
• dissects the block into two provinces
• the shallower eastern platform and
• the beginning of the western deep Basin
  (foredeep)
• Has developed infrastructure (oil pipeline)
• Several of the existing wells and/or seismic MAY
  be incorrectly placed meaning the existing dry
  holes may have not been valid tests, i.e.
  Cuininco North 1X and Cuininco Sur 1X OR
  improperly located because of logistical reasons
• Numerous paleostructures existed in the early
  Tertiary that may have reservoired sizeable oil
  accumulations
• This oil was available for remigration into late
  Tertiary aged structures during the Quechua
  tectonic events. i.e. Chambira Este and Majas
• Inadequate seismic coverage in certain portions
  of the block may not have defined all the
  existing structures