Brazilian turbidite reservoirs: heterogeneity study from outcrops to subsurface

Conference · Mon Feb 01 04:00:00 EST 1988 · AAPG Bull.; (United States)

OSTI ID:5794537

Moraes, M A.S.; Bruhn, C H.L.

Study of turbidite outcrops in several Brazilian formations permitted the construction of reservoir models that have been successfully applied in oil and gas fields. Five turbidite reservoir types were characterized. (1) Channel-levee complexes: groups of elongate sandstone or conglomerate bodies, commonly rich in rip-up clasts, each about 500 m wide, ranging in thickness from 5 to 50 m. These are typical canyon-filling sections of different basins. (2) Channelized lobe complexes; associations of thick (up to 50 m) and relatively continuous (> 10 km/sup 2/) sand bodies of mainly massive sandstones. This type occurs predominantly in the Campos basin and contains about 50% of Brazil's oil reserves. (3) Non-channelized lobe complexes: successions of classical turbidites, each sandstone layer tens of centimeters thick. These reservoirs are greater than 20 km/sup 2/ in area and have small thickness variations within a hydrocarbon field. They are widely distributed in the Brazilian basins. (4) Fringes: sand-shale sequences with the sandstone layer only a few centimeters thick. These are widely distributed in several basins. (5) Aprons: thick, subaqueous clastic wedges composed of conglomerates and coarse-grained sandstones deposited in slightly shallower water settings associated with faulted margins of rift basins. These reservoir models are of great applicability for well-to-well correlation and for the prediction of the degree of connection between adjacent flow units. Outcrop studies also provided more realistic input data for reservoir simulation studies, thus leading to better predictions of fluid flow patterns.

• Research Organization: Petrobras, Rio de Janeiro (Brazil)
• OSTI ID: 5794537
• Report Number(s): CONF-880301-
• Conference Information: Journal Name: AAPG Bull.; (United States) Journal Volume: 72:2
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
BRAZIL
CARBONATE ROCKS
CONGLOMERATES
DEVELOPING COUNTRIES
GEOLOGIC DEPOSITS
GEOLOGIC MODELS
LATIN AMERICA
MINERAL RESOURCES
NATURAL GAS DEPOSITS
PETROLEUM DEPOSITS
RESERVOIR ROCK
RESOURCES
ROCKS
SANDSTONES
SEDIMENTARY ROCKS
SOUTH AMERICA