--> Abstract: Modeling Methods to Simplify Layering and Faulting while Accurately Forecasting Production & Reserves, Negage Field, Block 14 Deepwater Angola, by Kathleen Mabe, Masroor Chaudhri, and Zhanat Sarsembayeva; #90072 (2007)

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Modeling Methods to Simplify Layering and Faulting while Accurately Forecasting Production & Reserves, Negage Field, Block 14 Deepwater Angola

Kathleen Mabe1, Masroor Chaudhri2, and Zhanat Sarsembayeva3
1Chevron International Exploration & Production, Houston, TX
2Chevron Energy Technology Company, Houston, TX
3Chevron Iinternational Exploration & Production, Houston, TX

The Negage field was the first discovery south of the Congo Canyon in Angola Block 14 by the contractor group consisting of CABGOC (the operator, a Chevron company) Sonangol P&P, ENI, GALP, and Total. Discovered in October 2002, Negage field is located in 4500 feet of water. The Congo River Canyon separates the Negage field from other Block 14 infrastructure, including the BBLT and Tombua-Landana developments. The reservoirs consist of high-quality deepwater turbidite channel sands of Miocene age.
Reservoir complexities associated with layering and faulting are incorporated into simulation models to address subsurface uncertainties and optimize the development. The objective of this full field study is to evaluate the current Reservoir Basis of Design for facilities alternative analysis for determining optimum well placement and mitigation strategies. A modeling workflow was developed to capture the fluid flow within the reservoir and simplifications to the geology were required to meet project time constraints. This presentation will show a modeling approach that not only adequately models the vertical and lateral reservoir compartmentalization for well placement decisions but also allows for quick reservoir model updates as new data become available.
Structural/stratigraphic framework and mapped surfaces of three channel complexes are used to build a faulted Sgrid which honor the complex cross-cutting relationships. Pinchout regions are used in simulation to either compartmentalize or connect some channel complexes. MPS is used to model channel sand distribution within each channel complex. Experimental design is used to design the number of models that capture the uncertainty of major modeling parameters. The recently developed Workflow Manager in Gocad is used to record all the workflows which can be updated with new data.

 

AAPG Search and Discovery Article #90072 © 2007 AAPG and AAPG European Region Conference, Athens, Greece