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MAZ Depth-Velocity Modelling and Imaging with Azimuthal Anisotropy
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, PGCE 2010, Mar 2010, cp-255-00006
Abstract
In recent years we have observed rapid developments in wide- and multi-azimuth seismic data acquisition and processing; in many regions such techniques are becoming more and more common. They dramatically improve illumination below complex overburden and allow geophysicists to study additional rock properties associated with azimuthal anisotropy. In order to fully utilize all the benefits of wide-azimuth seismic data some new challenges have to be solved at processing stage, one of them is depth-velocity modelling and imaging with azimuthal velocity anisotropy. The Middle Eastern onshore field of the current study is a fractured reservoir producing from rotated basement fault blocks with considerable structure. Moreover, the overburden contains several salt domes. A full azimuth 3D seismic survey was acquired to guarantee optimum illumination, to achieve detailed imaging and accurate positioning for the structure below the salt and to estimate stress and fracture related azimuthal anisotropy throughout the field. In order to meet these objectives a prestack depth migration that incorporates azimuthal anisotropy is required. Here, we will discuss issues associated with azimuthal anisotropic depthvelocity modelling and depth imaging.