--> Seismic Attributes in Subsurface Hydrocarbon Reservoir Mapping: A Case History of 3D Seismic Interpretation Over Timbe Field, Niger Delta, by U. O. Aikulola and M. A. Olorunniwo; #90037 (2005)

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Seismic Attributes in Subsurface Hydrocarbon Reservoir Mapping: A Case History of 3D Seismic Interpretation Over Timbe Field, Niger Delta

U. O. Aikulola and M. A. Olorunniwo
Obafemi Awolowo University, Ile-Ife, Nigeria

A comprehensive interpretation of a suite of 3D seismic data acquired over Timbe field, Niger delta was carried out using Landmark's SeisWorks/3D software. Three sand tops namely A_09, C_01 and D_07 in the field were selected as good interpretation candidates based on good petrophysical parameters. The wells penetrated into the downthrown side of the major structure-building fault in the study area. The mapped horizon surfaces and faults were exported to ZMap Plus, a gridding and contouring software, to generate time and depth structure maps for the interpreted horizons. The trapping mechanism is fault-assisted as the trap is an updip fault closure against the upthrown side of a northeast-southwest trending antithetic fault. A prospect was generated on the upthrown side section of the major structure-building fault based on seismic interpretation. The high RMS amplitude and reflection strength values that signify areas with anomalous acoustic impedance lie directly on the structural closures when the attribute maps were overlain on the structure maps. From the instantaneous phase maps it is also observed that only the events in D _07 sands are similar on the downthrown side of the major structure-building fault to the events on the upthrown side of the fault. The results of this study show that field conceptual development plan and economic model ought to be based on detailed 3D seismic interpretation including seismic attribute analyses to reduce the geologic risk of a prospect.