--> ABSTRACT: SEISDIP : The “VSP dipmeter” from Oriented 3 Components, by C. Naville, S. Serbutoviez, J. Bruneau, H. Japiot, R. Daures, and J. Y. Gaborit; #90906(2001)
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C. Naville1, S. Serbutoviez1, J. Bruneau1, H. Japiot2, R. Daures2, and J. Y. Gaborit2

1Institut Français du Pétrole, Rueil Malmaison, FRANCE
2Compagnie Générale de Géophysique, Massy, FRANCE

ABSTRACT: SEISDIP : The “Previous HitVSPNext Hit dipmeter” from Oriented 3 Components

Previous HitVSPNext Hit surveys are commercially recorded with a single zero-offset source position and with a downhole tool including 3 orthogonal seismic sensors. For Previous HitVSPNext Hit acquisition in vertical wells, a hardware orientation accessory needs to be combined with the Previous HitVSPNext Hit tool.

An “isotropic” Previous HitprocessingNext Hit of the oriented 3 Components (3C) Previous HitVSPNext Hit Previous HitdataNext Hit is necessary, meaning that all the Previous HitprocessingNext Hit operations are identically applied on the 3 components at any seismic time, ensuring the following benefits:

The illumination of seismic reflectors is achieved in 3 Dimensions, with information about their dip and azimuth (SeisdipTM method). 3C Previous HitVSPNext Hit yields the structural dip of seismic interfaces from the borehole up to distances of several hundred metres away from the well, even if the reflectors do not intersect the well, or are located below the well. A 3C Previous HitVSPNext Hit can be recorded in any well, cased or open hole. In contrast, electrical dip - meter log measurements relates to sedimentary dips within centimetres away from the well bore, and can be recorded in open hole only.

Reliable identification and improved discrimination of the upgoing Previous HitVSPNext Hit events: P or S reflected, diffracted and refracted arrivals. Only three component Previous HitprocessingNext Hit allows to disentangle a complex seismic wavefield containing mixed P and S wave mode arrivals coming from varied dipping reflectors, potentially curved, and from diffracting fault corners.

In case of interfering reflected/diffracted e vents generated by lateral dip variations or tilted faulted blocks, 3C Previous HitprocessingNext Hit allows to fully understand the Previous HitVSPNext Hit response, while the conventional single component Previous HitprocessingTop can mislead the interpreter.

AAPG Search and Discovery Article #90906©2001 AAPG Annual Convention, Denver, Colorado