Tracking Tertiary delta sands (Urdaneta West, Lake Maracaibo, Venezuela)
2004; Society of Exploration Geophysicists; Volume: 23; Issue: 9 Linguagem: Inglês
10.1190/1.1803502
ISSN1938-3789
AutoresManuel Poupon, José Arregui Gil, David Vannaxay, Bice Cortiula,
Tópico(s)Hydraulic Fracturing and Reservoir Analysis
ResumoThis 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 impedance data), improved the seismic interpretation, and provided the means to predict sands (in a nonamplitude-supported play). The geophysical results have been compared with the geologic data (cores and logs) and have confirmed the depositional model established by the geologists. The Urdaneta West field is operated by Shell Venezuela on behalf of Petroleos de Venezuela SA (Pdvsa). Even though this field has been producing for nearly 40 years (with more than 100 well penetrations over the …
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