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Alagamar–A¸u Petroleum System, Onshore Potiguar Basin, Brazil: A Numerical Approach for Secondary Migration

By
J.D. Souto Filho
J.D. Souto Filho
Petrobrás E & P–RNCE Natal, Brazil
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A.C. F. Correa
A.C. F. Correa
State University of Campinas Campinas, Brazil Permanent address: Petrobrás Training Center Salvador, Brazil
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E.V. Santos Neto
E.V. Santos Neto
Center of Excellence in Geochemistry Petrobrás R & D Center Rio de Janeiro, Brazil
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L.A.F. Trindade
L.A.F. Trindade
Center of Excellence in Geochemistry Petrobrás R & D Center Rio de Janeiro, Brazil
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Published:
January 01, 2000

Abstract

The main objective of this study was to investigate secondary migration in the A¸u Formation, including reconstruction of migration pathways, estimation of velocity of the migration fronts, and identification of key variables controlling the migration process. The Potiguar Basin in northeastern Brazil is an appropriate geologic setting for studying secondary migration. Almost all of the oil accumulated in the onshore A¸u sandstones was generated from offshore pods of active source rocks in the Alagamar Formation and has migrated laterally for long distances. The A¸u Formation, which is the main carrier bed and reservoir of this petroleum system, dips seaward as a regional monocline structure, with gentle folds, normal faults, and facies changes. In this study, we reconstructed the history of secondary migration using basin-scale modeling of 8272 grid cells. Rock and fluid properties used in this investigation are those typically found in most of the oil accumulations in the A¸u Formation.

Petroleum migration pathways and economic oil accumulations in the Alagamar–Acu petroleum system were controlled by northeast–southwest structural noses at the top of the A¸u Formation. Estimated ratios of oil displacement for the earlier oil migration fronts range from 3.0 to 7.0 cm/year. Oil in the main onshore accumulations of the Potiguar Basin may have been trapped between 1 and 5 m.y after the beginning of secondary migration. Significant loss of petroleum may have occurred along seepages from onshore outcrops of the A¸u Formation.

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Contents

AAPG Memoir

Petroleum Systems of South Atlantic Margins

Marcio Rocha Mello
Marcio Rocha Mello
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Barry J. Katz
Barry J. Katz
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American Association of Petroleum Geologists
Volume
73
ISBN electronic:
9781629810706
Publication date:
January 01, 2000

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