Reinterpretation of the two-dimensional seismic reflection of the Afaq structure region, central Iraq

Abstract

This study deals with interpretation of stratigraphic and structural of Afaq structure area central Iraq in Qadisiyah province, about 25 km north of Diwaniyah, by using 2D seismic data. Synthetic traces are prepared by using available data of the well (WK-1)using a petrol software program to define and picking the reflectors on the seismic section. Structure interpretation includes picking a top of Zubair Formation (Late Cretaceous), while stratigraphic interpretation includes two reflectors Yamama and Gotnia Formation (Upper-Late Jurassic). Structure interpretation of Zubair Formation shows that the area a several minors and a short extend of faults, the fault system extends (NE-SW) direction. The structural interpretation of time and depth maps of Zubair Formation shows that the Afaq structure is monocline have NE-SW direction and its plunging to the east. Several stratigraphic phenomena are present in the study area, which can help us in understanding the old sedimentary environment. It could have significant hydrocarbon potentials, including Buildup, and stratigraphic trap. Buildup indicators the study area is located in shallow areas that the light reaches to make these organisms gather to build colonies and these carbonate buildups represent important oil and gas sources in many sedimentary basins. Reef stratigraphic trap is discovered by use the Instantaneous phase attribute that shows a difference in the Acoustic impedance and the nature of the reflection, as well as the closing of the peak reflector inside a trough, all point to the presence of a trap in the seismic section.