Abstract

Optimization of reservoir development and management requires not only the correct placement of wells but also the monitoring of fluid-drainage patterns. Knowledge of the fracture patterns in any given field is critical to the success of the optimization process because they are conduits for the fluid flow. Saudi Aramco has recently completed the acquisition and processing of a walkaround VSP survey in the Haradh Field to map fluid pathways within the Arab Formation. The survey is in an area known for premature water-flood front advancement and uneven sweep through a system of open and partially healing fractures. The primary objective of the VSP survey therefore is to determine which seismic attributes can be related to the presence of the fractures. In this paper, we describe the data quality and amplitude normalization undertaken to minimize the overburden footprint to obtain an estimate of the fracture-induced traveltime, polarization direction, and amplitude anisotropy.

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