--> ABSTRACT: Geological Modeling of a Giant Turbidite Field Using Analogue Outcrop Data and Seismic Attributes, Deepwater Campos Basin, Brazil, by Del Rey, Antonio C.; Falcone, Celia; Silva, Jose Guilherme; Meira, Mateus; Vieira, Roberto B.; #90135 (2011)

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Geological Modeling of a Giant Turbidite Field Using Analogue Outcrop Data and Seismic Attributes, Deepwater Campos Basin, Brazil

Del Rey, Antonio C.1; Falcone, Celia 1; Silva, Jose Guilherme 1; Meira, Mateus 1; Vieira, Roberto B.1
(1)Petrobras, Vitoria, Brazil.

Jubarte is an oil field located in offshore portion of Campos Basin, southeastern Brazil. The field was discovered in 2001 and it is currently the most important oil accumulation in the State of Espirito Santo. Today, Fase I of the development plan has already been implemented and is producing through four one-kilometer-reservoir-exposure horizontal wells connected to FPSO P-34. The field cumulative oil production has already reached 67MM bbl, representing around 3% of the total reserve.

Fase II of the development plan is ongoing and eighteen new wells are being drilled at the moment. To support well planning, a new version of the 3D geological model, incorporating recent acquired data, is underway. This task has being accomplished by integrating several sources of information: new data coming from the new wells have being associated to information from analog outcrops, interpretation of seismic horizons corresponding to erosive surfaces of turbiditic channels, and seismic attributes of elastic inversion from a HD3D cube.

Analog outcrop information comes from the Annot sandstone (Annot Basin Eocene sequence, France). The vertical shape of facies sequence was inferred based on 3D models from this outcrop as well as the geometry of the channel filling, the vertical proportion curves (VPC) and facies variograms which work as a complement of well data.

Seismic surfaces mapped were used to distinguish different channel-filling populations that were modeled as individual regions in geological grid with different VPC, variograms and global statistics.

A very good correlation between turbiditic-channel-data VPC and Vp-Vs ratio, from elastic inversion performed in the HD3D seismic cube, was observed, making it possible to generate a 3D facies proportion map based on VP-VS ratio, wells and outcrop data.

The integration allowed a simulation of facies that better represents the existing reservoir heterogeneity.

 

AAPG Search and Discovery Article #90135©2011 AAPG International Conference and Exhibition, Milan, Italy, 23-26 October 2011.