SEISMIC STRATIGRAPHIC FRAMEWORK OF THE ABU MADI FORMATION , ABU MADI/EL QAR’A FIELD, NILE DELTA , EGYPT

Document Type : Original Article

Authors

1 Geology Department , Faculty of Science , Helwan University, Cairo , Egypt

2 Geophysics -Remote Sensing and G.I.S Unit- Geophysics Depart., Desert Research Center

3 Petrobel Oil Company ,Cairo, Egypt

Abstract

The sequence stratigraphic framework of the Abu Madi Formation of the Abu Madi/El Qar'a field area (AM/EQ) was determined using ”Vail” seismic sequence approach on 2D migrated seismic data and geovalidated by “Galloway” depositional sequence approach from associated borehole information. Operationally, those reflectors corresponding to a composite tuning of those layers near the top of Abu Madi Formation and top of Sidi Salem Formation were interpreted and mapped on a full grid of seismic lines in the area, through tying with synthetic seismograms generated from existing boreholes.
The Abu Madi Formation unconformably overlies the Highstand System Tracts (HST) of the Qawasim and Sidi Salem formations. This type I unconformity defines the geometric limits of the sedimentation whose main incised channel deposits comprise the proximal reaches of a Lowstand System Tract (LST). The overlying depositional sequence, whose upper boundary surface is marked by the Top of Level III-A, and interpreted as a maximum flooding surface of a Transgressive System Tract. The eastward and westward limits of the main channel area as well as the relative culmination area of the Qawasim Formation were structured in the Pre-Abu Madi time. This NNW-SSE oriented area then developed lateral seismic facies and vertical thickness variations in the Level III-A and III.
Supporting evidence for the existence of prolific petroleum systems in the Abu Madi /El Qar’a field area comes from basin modeling of the area, which incorporated an analysis of the petroleum system criticals. While oil exploration is now appropriately focused along the shallow to intermediate depth Late Cretaceous and Tertiary migration paths. These results suggest deeper sections, especially those of the Lowstand and Transgressive System Tracts that may have reservoirs charged with significant unrealized gas potential

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