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Anisotropic Prestack Depth Imaging Onshore Libya

Anisotropic Prestack Depth Imaging Onshore Libya. Christian Hanitzsch 1 , Bas van der Es 1 , Malcolm King 2 , Phil Whitfield 3 , Tamara Khlussovich 3 1 Wintershall-Libya, Tripoli, Libya; Mail address: PO Box 104020, 34112 Kassel, Germany 2 Monarch Technical Services, UK 3 WesternGeco UK.

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Anisotropic Prestack Depth Imaging Onshore Libya

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  1. Anisotropic Prestack Depth Imaging Onshore Libya Christian Hanitzsch1, Bas van der Es1, Malcolm King2, Phil Whitfield3, Tamara Khlussovich3 1 Wintershall-Libya, Tripoli, Libya; Mail address: PO Box 104020, 34112 Kassel, Germany 2 Monarch Technical Services, UK 3 WesternGeco UK

  2. Summary: Negative anisotropy • PreSDM: Negative anisotropy (VTI, d<0; e<0) is required to tie the seismic to well marker depths and maintain focused gathers. This is unusual. • Walkaway: Traveltime inversion shows negative anisotropy. • Core analysis: 8 of 12 samples indicate negative anisotropy. However, there are scale differences. • Three independent measurements confirm the presence of negative anisotropy for 2000 m thick limestones in this area (east Sirte basin). EAGE: Anisotropic Prestack Depth Imaging Onshore Libya

  3. Conclusions • Significantly improved image quality from PreSDM, compared to poststack and prestack time migration. • Major impact on interpretation of Top Reservoir • Better focus of overburden provides a better integrated fault interpretation • Anisotropy minimized risk for future well positioning • Negative anisotropy for 2000 m thick interval of mainly limestones, confirmed by walkaway and core analysis EAGE: Anisotropic Prestack Depth Imaging Onshore Libya

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