Depocenters with potential pres ervation of pre-Carboniferous rocks in Norte B as in (Urugua y) J osefina 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 3/ 21
INTR ODUCTION 4/ 21
Objective 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.
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 ouguer Gravity map, • 325 km of 2D seismic, • 6 stratigraphic and 4 explora tory wells, • Geological data collected in the field. y) and own data collected in the field . The information used in this work is property of ANCAP (the National Oil Company of Urugua 6/ 21
Loca tion of s tudy a rea B as ement S tudy area, map scale 1 :700.000 5/ 21 Regional location of the study area
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. 7/ 21
Geologica l s etting 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). S tra tigra phic cha rt of Norte B a sin. Modified from 8/ 21 de S a nta Ana , (2004)
Geophys ical data B as ement depth map . Modified from Olea ga , 2008 MT cros s s ection A-B Modified from Oleaga, 2008 A West East Urugua y N-S Fault River B Urugua y Argentina B asement top 9/ 21 wells MT wells faults cities
RES UL TS s urfa ce a na lys is 1 0/ 21
NW S E T opographic analys is 1 0 topographical sections were analyzed and 2 areas, topographically different, were defined : Wes tern Area Eas tern Area Wes tern Area : plane (xxx medium) with gentle slopes Eas tern Area : higher (xxx medium) with abrupt slopes NE S W 1 1 / 21
References Linea ments types Ara pey River Dra ina ge < 1 0Km Dra ina ge > 1 0Km Relief < 1 0Km Relief > 1 0Km Lineaments analys is Da ymá n River
Drainage analys is Eastern Area: unidirectional draina ge which cut the area from south to Northwest. Western Area: radial directional drainage B razil Wes tern Area Argentina Eas tern Area 1 st order drainage: Arapey and Daymán Rivers 2 nd order drainage: blue arrows indicates flow directions Dotted line: Valentin Grande Creek 1 2/ 21
S TR UCTURAL MAP / S AL TO – TAMB ORES CORRIDOR (S TC) S alto B razil Argentina T ambores 1 3/ 21
RES UL TS s ub s urfa ce a na lys is 1 4/ 21
Gravimetric analys is Arapey Fault Itapebí Fault S tudy Gravity area coverage B razil Argentina Da ymá n Fault
Arbitrary line: S CH84_06; UR U84_YP F-060; UR U84_YP F-061 ; UR U84_YP F-062. S ource: ANCAP 1 6/ 21
Interpretación sísmica UR84_YP F062 80 Km Línea arbitraria 2: (URU84_YPF-003 y URU84_YPF-004). Fuente: ANCAP
Ma gnetotelluria n interpreta tion 1 7/ 21
S outh North Precambrian Basement N-S geological cross section in the Western segment. Is integrated seismic, MT and 1 8/ 21 geological well data.
S outhwes t Northeas t Eo-creta ceous B a s a ltic flow J uro-Creta ceous La te P ermia n P recambrian Ea rly P ermia n B as ement P ermoca rboniferous Devonia n ? ? S outhwest - Northeast geological cross section in the Eastern segment. Is integrated seismic and geological well data.
Belén Conceptual geological model Salto 1 9/ 21
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. 20/ 21
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