--> A Proposal from Well Data Conditioning and Petrophysical Workflow as a Tool for Data Integration and Reservoir Management, Oguro, Aisgo; Silva, Adalberto, #90100 (2009)

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A Proposal from Well Data Conditioning and Petrophysical Workflow as a Tool for Data Integration and Reservoir Management

Oguro, Aisgo1
 Silva, Adalberto1

1LAGEMAR, Geofísica, Rio de Janeiro, Brazil.

Deep-sea clastic reservoirs, specially turbidite systems, has been a very important theme to the petroleum industry since it is clear that there are large unexplored oil and gas volumes in several areas around the world. Today, submarine fan and turbidite systems represent the largest oil and gas accumulation exploited in several sedimentary basins.

In addition, the integration of geological and geophysical information applied to reservoir management is sometimes based on a priori assumptions that do not deal with some intricacies of the reservoir petrophysical parameters, especially those related to fluid substitution due to the drilling process itself and the important effects of the filtrate on elastic properties estimations.
In this work, we propose a petrophysical analysis workflow to two different stratigraphical producing levels in Albacora Field,
Campos Basin, Brazil. Our primary subject lies on the Oligocene and Miocene turbidite sandstones reservoirs from the Carapebus Fm in this field. Based on well logging data and a thorough data conditioning, we propose an approach to petrophysical modeling that takes into account different fluid types in the reservoir rocks (including variable water/hydrocarbon saturation figures) and different contact types, using AVO analysis and log-derived synthetic seismic models. The models derived in this workflow are considered a more realistic foundation to the seismic integration procedure.

Using a wavelet extracted from the seismic cube, several different scenarios were modeled (for instance: honoring the types of fluids in the reservoir and variations with saturation; different porosity estimatives based on the mineral content or even on acquisition issues; etc.) and could be compared to seismic and production information in order to attain a better knowledge about the reservoir dynamics.


AAPG Search and Discover Article #90100©2009 AAPG International Conference and Exhibition 15-18 November 2009, Rio de Janeiro, Brazil