Reconciling Log-Derived Water-Saturation and Saturation-Height Function Results

Topics: Reservoir characterization
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Saturation-height functions (SHFs) play a key role in reservoir description and in quantifying oil in place. The functions must compare well with other sources of water saturation (Sw), such as core measurements and well-log interpretations, when they are available. The authors have reconciled different Sw sources through a reliable SHF function based on the Brooks-Corey model with parameters optimized for the Gulf of Mexico (GOM) Thunder Horse (TH) Field. The function is used to populate oil volumes in the 3D static and dynamic models.

General Description of the Hydrocarbon Field

TH is located in a six-block “lease unit” of the Mississippi Canyon (MC) area of the deepwater GOM. The field is approximately 69 miles from the Louisiana coastline in water depths ranging from 6,000 to 6,500 ft.

The TH facility consists of a taut-wire-moored semisubmersible system with production, drilling, and quarters (PDQ). The PDQ is located near the southern boundary of MC 778. The PDQ is designed to handle 250,000 BOPD, 200 MMscf/D, and 140,000 B/D of produced water. The facility was also designed to handle 300,000 B/D of mixed seawater/produced water for injection. The TH wells are located in subsea drill centers, with additional satellite subsea-production wells located where the reservoir structure dictates. Sixteen producers have been brought on line since first oil on 14 June 2008. The total volume produced as of the end of 2014 is estimated at 300 million BOE. Oil and water rates (December 2014) are 100,000 BOPD and 26.500 BWPD, respectively.

The TH discovery contains hydrocarbon resources in two structural closures commonly referred to as the TH South (THS) and TH North (THN).

This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 175053, “Reconciling Log-Derived-Water-Saturation and Saturation-Height-Function Results Through Resistivity Modeling, Core-Log Integration, and Image-Log Data: A Case Study From Deepwater Gulf of Mexico,” by Javier Miranda, Michael Rabinovich, Jeffry Hamman, and Maryam Mousavi, SPE, BP, prepared for the 2015 SPE Annual Technical Conference and Exhibition, Houston, 28–30 September. The paper has not been peer reviewed.
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Reconciling Log-Derived Water-Saturation and Saturation-Height Function Results

01 August 2016

Volume: 68 | Issue: 8