STRATIGRAPHIC ANATOMY OF SHELFAL MIOCENE RESERVOIRS: WESTERN MATURÍN BASIN, VENEZUELA
Published:December 01, 1997
RODOLFO PORTA, SEBASTIÁN GALEAZZI, PETER SADLER, DANIEL RISI, MIGUEL ULIANA, LEONARDO LEGARRETA, ROBERT M. MITCHUM, 1997. "STRATIGRAPHIC ANATOMY OF SHELFAL MIOCENE RESERVOIRS: WESTERN MATURÍN BASIN, VENEZUELA", Shallow Marine and Nonmarine Reservoirs: Sequence Stratigraphy, Reservoir Architecture and Production Characteristics, Keith W. Shanley, Bob F. Perkins
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The Maturin basin is a supercharged hydrocarbon setting that hosts the world’s largest individual oil accumulation: the Orinoco Belt, in situ 1.2 TBO. Miocene strata represent the most prolific reservoirs in the Maturin and in several of the Eastern Venezuela-Trinidad oil districts. Production in this region is in excess of 10 BBO. In spite of protracted and intense exploration and production activity by the oil industry, detailed stratigraphic knowledge on the oil-bearing Miocene successions has received only limited consideration in the public domain literature. As part of a field reactivation project undertaken on behalf of Corpoven S.A., rightholder of the Quiamare-La Ceiba unit (Fig. 1), the Lower-Middle Miocene succession in NE Anzoátegui was analyzed from a sequence-stratigraphic and reservoir-characterization perspective. The study follows a four-fold approach: the first part outlines the geodynamic context and describes the key elements of the basin-scale Miocene stratigraphy and paleogeography; the second part discusses the sequence stratigraphy of the 4,000 m (12,000 ft) thick Miocene series over the SW fringe of the Maturin fold-thrust belt, as well as the implications of the regional stratal patterns and facies architecture for trapping potential; the third part examines the anatomy of individual reservoirs at the parasequence scale, describes the effects of fourth-order sequences on trapping, and analyzes internal reservoir facies heterogeneities; the last part focuses on the potential of seismic inversion for pre-drill reservoir prediction and efficient development planning.