J osefina Marmisolle, Gerardo Veroslavsky & Hctor de S anta - - PowerPoint PPT Presentation

Depocenters with potential pres ervation

• f pre-Carboniferous

rocks in Norte B as in (Urugua y)

J

• sefina Marmisolle, Gerardo Veroslavsky & Héctor de S

anta Ana B arcelona, S pain. 201 6

Content

• Introduction
• Objective
• Location of study area
• Methodology and databa

se

• Geological setting
• Results
• S

urface analysis

• S

ubsurface analysis

• Conclusions
• References

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INTR ODUCTION

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The main objective of this work was to identify and characterize the deepest depocenters of the Norte B a sin with potential preservation of the stratigraphic column a nd the morph-structural characterization of the faults that define them.

Objective

Methodology a nd da ta ba s e

B as in analys is was the methodology used in this work,

Were integrated different data and information from surface and subsurfa ce. Were included:

• DEM and La

ndsat images for the topogra phic and geomorphologica l ana lysis,

• magnetotelluric sections,
• B
• uguer Gravity map,
• 325 km of 2D seismic,
• 6 stratigraphic and 4 explora

tory wells,

• Geological data collected in the field.

The information used in this work is property of ANCAP (the National Oil Company of Urugua y) and own data collected in the field.

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Regional location of the study area S tudy area, map scale 1 :700.000

Loca tion of s tudy a rea

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B as ement

P araná B as in and s tructural main features

S tructural setting of the P araná B asin. Modified from Zalán et al., 1

• 990. Include

the main structural lineament indicated by P reciozzi et al., 1 979 for Uruguay.

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Geologica l s etting

S tra tigra phic cha rt of Norte B a

• sin. Modified from

de S a nta Ana , (2004) Ca mbria n, Ordovicia n a nd S iluric cla stic depocenters with N-NE preferentia l

• direction. Modified from

Ta nka rd et a

• l. (1

995). B N (B a rriga Negra , Uy), CC (Centra l rift, B r), CQ (Ca ma qua , B r), FC (Corrientes gra ben, Ar), S F (S a nta Fé gra ben, Ar), P E (rift P unta del Este, Uy).

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Geophys ical data

Urugua y River Urugua y

Argentina

B asement top N-S Fault

East West

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MT wells wells faults cities

MT cros s s ection A-B Modified from Oleaga, 2008

A B

B as ement depth map.

Modified from Olea ga , 2008

RES UL TS s urfa ce a na lys is

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T

• pographic

analys is

S W NE NW S E Wes tern Area

1 0 topographical sections were analyzed and 2 areas, topographically different, were defined:

Wes tern Area: plane (xxx medium) with gentle slopes Eas tern Area: higher (xxx medium) with abrupt slopes

Eas tern Area

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Lineaments analys is

Ara pey River Da ymá n River References Linea ments types Dra ina ge < 1 0Km Dra ina ge > 1 0Km Relief < 1 0Km Relief > 1 0Km

Drainage analys is

1

st order drainage: Arapey and Daymán Rivers

2nd order drainage: blue arrows indicates flow directions Dotted line: Valentin Grande Creek

Eastern Area: unidirectional draina ge which cut the area from south to Northwest. Western Area: radial directional drainage

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Eas tern Area Wes tern Area

B razil Argentina

S alto T ambores

S TR UCTURAL MAP / S

AL TO – TAMB ORES CORRIDOR (S TC)

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B razil Argentina

RES UL TS s ub s urfa ce a na lys is

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Gravimetric analys is

Arapey Fault Itapebí Fault Da ymá n Fault

Gravity coverage S tudy area

B razil Argentina

Arbitrary line: S CH84_06; UR U84_YP F-060; UR U84_YP F-061 ; UR U84_YP F-062. S

• urce: ANCAP

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Interpretación sísmica

Línea arbitraria 2: (URU84_YPF-003 y URU84_YPF-004). Fuente: ANCAP

80 Km

UR84_YP F062

Ma gnetotelluria n interpreta tion

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N-S geological cross section in the Western segment. Is integrated seismic, MT and geological well data. S

• uth

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North Precambrian Basement

S

• uthwes

t Northeas t

S

• uthwest - Northeast geological cross section in the Eastern segment.

Is integrated seismic and geological well data.

P ermoca rboniferous Eo-creta ceous B a s a ltic flow La te P ermia n Ea rly P ermia n Devonia n J uro-Creta ceous

P recambrian B as ement

? ?

Conceptual geological model

Belén Salto

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Conclus ions

• A NW trend S

alto-Tambores Corridor (S TC) limited by two main faults (Da ymá n and Arapey).

• The S

TC controls a set of NE trending normal and listric faults, responsible for the deepening of the basin to the W.

• The structural configura

tion of the S TC has a good correlation between the surface and subsurfa ce data.

• The Eastern segment topography is represented by hills with strong slopes, with elevation above sea level up to

270m. S ub-surfa ce data for this segment indicates that basement depth reaches 800m and Devonian sequence is preserved (confirmed by several wells).

• The Western segment is represented by a plane topography.

S eismic and MT data indicates that basement depth > than 3500m.

• The Itapebí Fault with NW strike and dipping North, located between Da

ymá n and Arapey Faults is recognized as very important control of basin preservation where was identified a 3700 m depth depocenter.

• In the extreme Western segment and parallel to Urugua

y River, N-S trend faults were identified in the surface and subsurfa ce analysis. These structural setting is very important because allows to presume a pre-carboniferous rocks preservation.

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References

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