An applied sequence stratigraphic approach in reservoirs characterization, Eastern Venezuela: El Carito-El Furrial Fields

Conference · Mon Feb 01 04:00:00 EST 1993 · AAPG Bulletin (American Association of Petroleum Geologists); (United States)

OSTI ID:5941242

Sifontes de, R; Hernandez, E ^[1]

---

1. Intevep S.A., Caracas (Venezuela)

Integration of biostratigraphic, sedimentologic and petrophysic data from cores and well logs in reservoirs in El Carito-El Furrial Fields, Northern Monagas, Eastern Venezuelan Basin, allows to differentiate two sedimentary sequences ranging between the Upper Cretaceous and the Oligocene. The Maastrichtian-Paleocene sequence is divided into two sedimentary units (C and 1) both representing a south to north progradation from shallow marine to fluvial environments, within a large regressive cycle. The Middle Eocene to Middle-Late Oligocene sequence includes sedimentary units II and III. Unit II represents a large transgressive cycle of mostly inner neritic deposits with a condensed section at the base which changes laterally from glauconitic to lutitic facies to the south. Unit III grades transitionally from the inner neritic deposits of unit II to shallow marine deposits, and changes to inner neritic deposits again to the top. Unit III is interpreted as a large regressive -transgressive cycle. In all these sedimentary units, lithofacies association, paleoenvironments variation and definition of large cycles helped to define the parasequence stacking sets. The petrographic analysis points out that sandstones in unit C are basically subarcosic, while in units I, I and III are quartzitic. Additionally, sandstones in units C and II are very cemented by quartz and carbonates respectively, showing chemical compaction, in contrast to units I and III where quartz dissolution is a porosity enhancing process. This indicates that sandstones in these units have the best porosity and permeability values, resulting in the best producing intervals in the study area.

• OSTI ID: 5941242
• Report Number(s): CONF-930306--
• Conference Information: Journal Name: AAPG Bulletin (American Association of Petroleum Geologists); (United States) Journal Volume: 77:2
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
CARBON COMPOUNDS
CARBONATES
CENOZOIC ERA
CRETACEOUS PERIOD
DEVELOPING COUNTRIES
ENERGY SOURCES
EOCENE EPOCH
FOSSIL FUELS
FUELS
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC STRUCTURES
GEOLOGY
LATIN AMERICA
LITHOLOGY
MESOZOIC ERA
MINERAL RESOURCES
MINERALS
OIL FIELDS
OXIDE MINERALS
OXYGEN COMPOUNDS
PERMEABILITY
PETROLEUM
PETROLEUM DEPOSITS
PETROLOGY
POROSITY
PRODUCTIVITY
QUARTZ
RESERVOIR ROCK
RESOURCES
ROCKS
SANDSTONES
SEDIMENTARY ROCKS
SEDIMENTATION
SOUTH AMERICA
STRATIGRAPHY
TERTIARY PERIOD
VENEZUELA