Reservoir fluids and their migration into the South Eugene Island Block 330 reservoirs, offshore Louisiana

Losh, Steven; Walter, Lynn M.; Meulbroek, Peter; Martini, Anna M.; Cathles, L. M.; Whelan, Jean K.

doi:10.1306/61eedcce-173e-11d7-8645000102c1865d

Cited by 8 publications

(1 citation statement)

References 31 publications

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“…According to our recent investigations, 39 the average SLR rate during the past five decades within the GOM is 2.6 mm/year with respect to GOM20. The peak production of oil and gas in Eugene Island 300 oil field area occurred during the 1970s–1990s 67 ; the production since the 2000s is much lower than its peak production period. The seafloor subsidence from the 1980s to 2000s was likely more rapid than the GNSS-recorded subsidence (12 mm/year) during the 2010s.…”

Section: Resultsmentioning

confidence: 98%

A methodology for long-term offshore structural health monitoring using stand-alone GNSS: case study in the Gulf of Mexico

Wang

2023

Structural Health Monitoring

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This article presents a robust methodology for long-term offshore structural health monitoring (SHM) using the Global Navigation Satellite Systems (GNSS). The methodology relies on recently developed regional reference frames and single-receiver phase-ambiguity-fixed Precise Point Positioning techniques. The stable Gulf of Mexico Reference Frame 2020 (GOM20) provides a robust and consistent reference system for long-term offshore SHM in the Gulf of Mexico (GOM). Continuous GNSS observations (DEV1, 2010–2020) on a fixed platform in the Eugene Island 330 oil field are used to illustrate the methodology. The platform was installed in 1982 in 82-m water about 130 km away from the Mississippi Delta coastline. The major monitoring items include horizontal movements, seafloor subsidence, structure submergence, and seasonal oscillations. The stand-alone GNSS monitoring achieves 3- to 4-mm root-mean-square accuracy in the horizontal direction and 7 mm in the vertical direction for daily positions in the GOM region. According to this study, the GNSS antenna (DEV1) has moved 6 cm toward the northeast with respect to GOM20 since 2010; the ongoing structure submergence rate in the Eugene Island 330 oil field area is approximately 15 mm/year, a combination of seafloor subsidence (12 mm/year) and sea-level rise (2.6 mm/year) with respect to GOM20. The submergence in the future 40 years (2021–2060) would be greater than 0.6 m, likely between 0.8 and 1.0 m, but is unlikely to exceed 1.3 m. The peak-to-trough amplitudes of the seasonal movements at the top of the platform are below 5 mm in all three directions, comparable with the seasonal movements recorded by onshore GNSS in the Louisiana coastal region. The methodology introduced in this article can be applied to SHM in other offshore regions where stable regional reference frames are available.

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Section: Resultsmentioning

confidence: 98%