Abstract
The structural division and stratigraphic estimation of the perceptible geological basin are the most important for oil and gas exploration. This study attempts to obtain subsurface geology in parts of east Nasiriya, southern Iraq using of seismic data and some adjacent well information for structural and stratigraphic interpretation. To achieve this goal, 2D seismic data in SEG-Y format were used with velocity and logging data. The seismic profile is then interpreted as a two-dimensional (time domain and depth domain) contour map, which is represented as a real subsurface geology.
 Reflectors from the Mishrif and Yamama Formations (Cretaceous period) were detected. According to the structural interpretation of the selected reflectors, TWT maps of the horizon were prepared, and depth maps were drawn, which show some noses structures in the study area. The seismic interpretation in this area confirmed the existence of certain stratigraphic features in the studied strata. Some distribution mounds and flat spots were also observed which similar to the characteristics of the Nasiriya oil field stratigraphic features that are the considered as hydrocarbon indicators.
Highlights
Seismic method is the main important method of geophysical exploration, because it has deep penetration ability and high resolution, can detect the physical properties of subsurface geology
In the term of oil economic value, Mishrif and Yamama Formations are belonged to the most important oil production reservoirs in southern Iraq and neighboring area, which are deposited during Cretaceous period
The chosen study has an important location between the oil fields and it is considered as the extension for many of studies carried out by a number of researchers, where it specializes on structure and stratigraphy analysis of Mishrif and Yamama Formations
Summary
Seismic method is the main important method of geophysical exploration, because it has deep penetration ability and high resolution, can detect the physical properties of subsurface geology. In the term of oil economic value, Mishrif and Yamama Formations are belonged to the most important oil production reservoirs in southern Iraq and neighboring area, which are deposited during Cretaceous period. These formations are characterized by good reservoir’s specifications to contain hydrocarbon [4]. According to the longitudinal tectonic classification of Iraq[7,8] the study area is located at the southern part of Iraq within the Mesopotamian basin of unstable shelf (Simawa-Nasiriya subzone)
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