Azimuthal anisotropy at Valhall: The Helmholtz equation approach

Aurélien Mordret, Nikolai M. Shapiro, Satish Singh, Philippe Roux, Jean Paul Montagner, Olav I. Barkved

Publikation: Bidrag til tidsskriftArtikelForskningpeer review

33 Citationer (Scopus)

Resumé

We used 6 h of continuous vertical records from 2320 sensors of the Valhall Life of Fields Seismic network to compute 2,690,040 cross-correlation functions between the full set of sensor pair combinations. We applied the "Helmholtz tomography" approach combined with the ambient noise correlation method to track the wave front across the network with every station considered as a virtual source. The gradient of the interpolated phase travel time gives us an estimate of the local phase speed and of the direction of wave propagation. By combining the individual measurements for every station, we estimated the distribution of Scholte's wave phase speeds with respect to azimuth. The observed cosine pattern indicates the presence of azimuthal anisotropy. The elliptic shape of the fast anisotropy direction is consistent with results of previous shear wave splitting studies and reflects the strong seafloor subsidence due to the hydrocarbon reservoir depletion at depth and is in good agreement with geomechanical modeling.

OriginalsprogEngelsk
Sider (fra-til)2636-2641
Antal sider6
TidsskriftGeophysical Research Letters
Vol/bind40
Udgave nummer11
DOI
StatusUdgivet - 16 jun. 2013
Udgivet eksterntJa

Programområde

  • Programområde 3: Energiressourcer

Fingeraftryk

Dyk ned i forskningsemnerne om 'Azimuthal anisotropy at Valhall: The Helmholtz equation approach'. Sammen danner de et unikt fingeraftryk.

Citationsformater