Application Of Rms Amplitude Anomaly Mapping In Inferring Controls On Fluid Saturation And Fault-Bound Reservoir Compartments In The C4 Member (Lower Misoa Formation), Phase Iii Area, Bloque I Area , Lake Maracaibo, Venezuela

Three-dimensional seismic data are increasingly being used in reservoir characterization studies as an aid in<br>detecting and delineating structural and lithologic features as well as changes in fluid distribution that may not<br>be resolvable with log data at wide well spacings. Amplitude maps, in addition to displaying distribution of<br>lithology, can also be effective in inferring subtle faults associated with changes in reservoir fluid content.<br>In a IZmonth reservoir characterization study of tide-dominated deltaic and shelf reservoirs of the Lower<br>Eocene Misoa Formation in a 4-mi*(10.4-km*) rectangular area (Phase III Area) in the Bloque I Area,<br>3-D seismic data were used in conjunction with logs from approximately 50 wells to detect and delineate faults<br>and to infer interwell sand-body distribution. The goal of this reservoir analysis was to construct an improved<br>geological model of oil- and gas-productive reservoirs in the Lower Eocene to better understand controls on<br>reservoir compartmentalization and to identify areas of unswept hydrocarbons. This paper provides examples<br>from the C4 Member and demonstrates how 3-D seismic data were used to infer the presence of faults not<br>previously detected in earlier studies of these reservoirs with conventional log data and to illustrate their control<br>on fluid distribution.