Carbonate reservoirs at the Mesozoic-Tertiary unconformity, northeast Spain

Conference · Mon Aug 01 00:00:00 EDT 1988 · AAPG Bull.; (United States)

OSTI ID:5848510

Esteban, M

Carbonates at the Mesozoic-Tertiary unconformity in northeast Spain show four types/stages of evolution of reservoir properties: karstification, coastal reworking, Miocene organic buildups, and Pliocene burial. Subaerial exposure during Paleogene-early Miocene rifting developed a complex fracture-controlled paleokrast facies, showing up to three evolution levels with well-developed cavern and vuggy porosity (1). During the Miocene, the paleokrast profile was intensively reworked into a variety of breccias, conglomerates, and calcarenites in both alluvial and coastal depositional settings. Gravitational displacement of largely karstified hillsides was common. These reworked paleokarst deposits (2) present excellent reservoir properties. The Miocene formations onlap the karstified Mesozoic and the reworked facies; these formations include coral reefs and foramalgal buildups (3) with primary and secondary porosity. Finally, a late fracture event (attributed to the Pliocene) affected the buried and lithified paleokarst deposits and lower-middle Miocene formations (4). This fracture event is associated with vuggy corrosion, dolomitization, ore mineralization, and leaching of Mesozoic to middle Miocene carbonates. Several horizons with chalky microporosity are also tentatively related to this Pliocene event. These four phases of reservoir evolution are also recognized in northern Morocco and southern Italy.

• Research Organization: ERICO Petroleum Information, London (England)
• OSTI ID: 5848510
• Report Number(s): CONF-8809346-
• Journal Information: AAPG Bull.; (United States), Vol. 72:8; Conference: Mediterranean Basins conference and exhibition, Nice, France, 25-28 Sep 1988
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
PETROLEUM DEPOSITS
RESERVOIR ROCK
SPAIN
CARBONATE ROCKS
GEOLOGIC FAULTS
POROSITY
TERTIARY PERIOD
CENOZOIC ERA
DEVELOPING COUNTRIES
EUROPE
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC FRACTURES
GEOLOGIC STRUCTURES
MINERAL RESOURCES
RESOURCES
ROCKS
SEDIMENTARY ROCKS
WESTERN EUROPE
020200* - Petroleum- Reserves
Geology
& Exploration