3D Structure and Stratigraphic Evaluation for Hydrocarbon Enhanced Recovery Tersa Oil Field, El-Fayum area, Western Desert, Egypt

Abstract

Tersaoil field lies within El Fayum concession west ofRiverNilein thenortheast

portion of the Western Desert Egypt. It is one of the producing fields for Petrosilah Company in El Fayum concession, the field surrounded by many other productive fields to the South, Southwest and West directions. It includes eight wells, in an area of 200 km² with good distribution over the area of study. The field starts production with the exploratory well Tersa-1X in March 2009 and considered as a discovery well followed by another discovery NE Tersa-1X well. The field has a several geophysical and geological challenge at different stages of the development plan represented in tracking the extension of hydrocarbons pays and expecting the reservoir parameter.

Tersa oil field is considered as a part of Gindi Basin, in which different tectonic deformation events affect and controlling the potentiality of the area. Structural geometry configuration through the interpretation of high resolution PSTM-3D seismic reflection data as well as the available drilled wells which play a good role to define the different deformation, integrated with the seismic attributes analysis to better visualize the structural elements and to detect any stratigraphic features in the area. Structural analysis delineates a great deformation zones in the area, including a different sets of fault orientation. In addition, the presence of both the strike slip component and the basin inversion with the presence of stratigraphic features channel system, which are controlling the reservoir distribution and field productivity, which is under development phase nowadays.

Seismic interpretation process starts with matching the available well data with

seismic data through creating the synthetic seismogram, four wells used for this match and to identify the lithostratigraphic units in the area. Seismic interpretation including picking themain horizon and identifying thestructural elements performed overTersafield. Mapping thepicked horizon in timedomain to establishTWT maps,

ii

analyze the average and interval velocities to be used for the depth conversion process, and to create a set of depth maps which better describe and representing the subsurface.