Connecting onshore-offshore Campos Basin structures: Interpretation of high-resolution airborne magnetic data

Author:

Lourenço Juarez1,Menezes Paulo T. L.2,Barbosa Valeria C. F.3

Affiliation:

1. Observatório Nacional, Rio de Janeiro, Brazil and Faculdade de Geologia UERJ, Rua São Francisco Xavier, Rio de Janeiro, Brazil..

2. DGAP/FGEL/UERJ, Rio de Janeiro, Brazil..

3. Observatório Nacional, Rio de Janeiro, Brazil..

Abstract

We interpreted northwest-trending transfer faults whose extensions are not entirely mapped in the Precambrian basement of the onshore and offshore Campos Basin. To enhance the subtle northwest–southeast lineaments not clearly seen in the total-field data, we reprocessed and merged two airborne magnetic data sets aiming at producing a single merged magnetic data set. Next, we applied a directional filter to these integrated magnetic data. Finally, we applied a multiscale edge detection method to these filtered data. This combination allowed the detection of edges and ridges that are used to produce several northwest–southeast lineations. We interpreted these northwest-trending lineations as magnetic expressions of transfer faults that cut across the onshore adjacent basement of the Campos Basin to the shallow and deep Campos Basin waters. These interpreted northwest-trending faults suggested the continuity of the known northwest-striking transfer faults in the deep Campos Basin waters toward the shallow Campos Basin waters and the adjacent continent. Moreover, our interpreted northwest-trending faults revealed the control of several known oilfields in the Campos Basin. This result supported the hypothesis of the influence of the northwest–southeast-trending transfer faults on the petroleum system of Campos Basin, which were reactivated in the Tertiary providing a pathway for the turbidite sedimentation, reworking, and redistribution of several deepwater reservoirs. In addition, it was hypothesized that this faulting system controlled the hydrocarbon migration paths from the presalt source rocks through salt windows into basal suprasalt layers.

Publisher

Society of Exploration Geophysicists

Subject

Geology,Geophysics

Reference47 articles.

1. Multiscale edge analysis of potential field data

2. Asmus, H. E., 1982, Significado geotectonico das feições estruturais das bacias, marginais brasileiras e áreas adjacentes: Presented at Anais do XXXII Congresso Brasileiro de Geologia, 1547–1557.

3. Gravity data as a tool for detecting faults: In-depth enhancement of subtle Almada’s basement faults, Brazil

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