Even extensively drilled and supposedly well-understood fields have the capacity to surprise and challenge the reservoir modeling. This paper describes the unexpected discovery of a new reservoir based on the quantitative seismic attribute analysis performed to identify the target reservoir sand and determine a development strategy for the reservoir. While drilling a fairly routine development well in Ganso Field in the Oficina Basin of eastern Venezuela, ENI Dación discovered a new shallow accumulation, reservoired in high-quality channel facies sandstone that was 30 ft thick and full of relatively light oil. The reservoir flowed at the excellent rate of 950 b/d with 0% watercut on testing. The unexpected element of this discovery was that the accumulation was found with the landing section of a horizontal well targeting a deeper level, and the sand was completely absent in the pilot hole some 120 m away (Figure 1).

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