This paper illustrates a novel approach (based on seismic facies classification and 3D visualization) for tracking deltaic sand systems in the Urdaneta West producing field, Lake Maracaibo, Venezuela. As part of a major field review (volume evaluation and well planning), the following oil-bearing reservoirs were studied:

Among the geologic challenges associated with developing these reservoirs, the thinness of the sand layers and the lack of amplitude response of heavy oil-bearing sands were key. Consequently, a dedicated geophysical workflow was designed to address these issues. It comprises the following steps:

This workflow integrated all available seismic attributes (including poststack attributes and...

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