Online Journal for E&P Geoscientists

Sakran, Shawky M.^*1, Moustafa, Adel R.²; Zakariya, Ahmed³; Mohamed, Samy⁴; El- Saeid, Nbil⁵; Khedr, Gamal^5
1 Geology Department, Faculty of Science, Cairo University and Schlumberger, Cairo office.
² Ain Shams University
³ Dana Gas, Egypt
⁴ Schlumberger, Cairo Office
⁵ General Petroleum Company, Egypt

Structural Modeling and evolution of North Amer Field, Gulf of Suez, Egypt

The seismic data of North Amer field are poor, which makes structural modeling of the field a challenging task. To conquer this challenge, integration of the available geological and geophysical data was used to construct the field structural model. The available data includes magnetic data, 3D and 2D seismic data, dipmeter data, and well logs with intervals of missing sections.

Integration of the dipmeter data with the well logs allowed construction of a series of problem-solving structural cross sections. The combination of dipmeter data, formation tops, and the missing sections yielded a preliminary structural model of the field. The location and orientation of faults was constrained with interpreted seismic data.

Two methods were used for seismic mapping of faults. In the first method, faults were interpreted directly by using the structurally smoothed seismic sections and time slices and were integrated with the preliminary structural model and structural cross sections. The second method is an automated method in which variance and ant-tracking analysis was used to generate faults at shallow targets, and structural stacking was used to map the other (deeper) targets.

After calibration of the seismic data at well locations with the created synthetic seismograms, five seismic reflectors were identified: Top Zeit, Top Belayim, Top Rudeis, Top Thebes, and Top Matulla formations. The interpreted seismic reflectors were gridded, depth converted, and used as input to proprietary simulation software to create the structural model.

Structural restoration and palinspastic mapping are used to validate structural interpretation, unravel the structural evolution of the field and to determine the structural control on the distribution of the reservoirs.