Structural and Stratigraphic Study of Hartha Formation in the East Baghdad Oil Field, Central of Iraq.

Abstract

Three-dimensional seismic reflection study was conducted for the Eastern
Baghdad oil field which is located in the middle part of Iraq within Al-Madaaen
province that belong to Baghdad governarate, South of Diyala River , this field
includes two southern parts (S1 and S2), the study area was about 781.905 km 2 for
the upper Cretaceous age, synthetic seismogram was generated from data of EB-5
and EB-1 wells. Saadi reflector was picked and identified to determine the Hartha
Formation. The seismic sections and time slice maps confirmed that the upper
Cretaceous age was affected by faults and the indicators of faults ended within
Hartha Formation and continue to the deeper formations with increasing intensity.
The attribute section was applied on time slice and shows that the area was affected
by normal fault parallel to the structure of the field trends (NW-SE). Time, velocity
and depth maps of Hartha reflector depending on data from wells (EB-1, EB-2, EB-
6, EB-30, EB-52, EB-54) the maps show the structural picture of East Baghdad
structural nose opened toward NW and trending (NW-SE) that confirmed by 3D
volume which prepared for the studied area. DHI was identified as flat spot, dim
spot and sag , when applying attributes like (instantaneous phase and Instantaneous
Frequency) has been proved the absence of hydrocarbons in EB-15 well on other
hand found in adjacent wells such as EB-2 and EB-5 because of facies changes and
not structural change. A scaling facies change was identified at (inline 40910 and
inline 47960) , Mound (inline 48310), as well as the work of the Isochron map,
which was used to find Isopach and a suitable site for drilling wells.