@Article{, title={The Jurassic and Deep Structures Inferred from Gravity Data Depending on Stripping Technique for The Uppermost Layers in Central and Southern Iraq}, author={Ahmed S. AL-Banna and Reham S. AL-Saffar}, journal={Iraqi Journal of Science المجلة العراقية للعلوم}, volume={63}, number={8}, pages={3521-3532}, year={2022}, abstract={The gravity anomalies of the Jurassic and deep structures were obtained bystripping the gravity effect of Cretaceous and Tertiary formations from the availableBouguer gravity map in central and south Iraq. The gravity effect of the strippedlayers was determined depending on the density log or the density obtained from thesonic log. The density relation with the seismic velocity of Gardner et al (1974) wasused to obtain density from sonic logs in case of a lack of density log. The averagedensity of the Cretaceous and Tertiary formation were determined then the densitycontrast of these formations was obtained. The density contrast and thickness of allstratigraphic formations in the area between the sea level to the top of Jurassicformations were used to determine the gravity effect of these layers. The gravityanomaly map of the stripped formation was determined. The gravity anomaly mapof the stripped formation was subtracted from the Bouguer gravity map, and thegravity anomaly map of deep structures was obtained. The regional and residualmaps (3rd order polynomial ) were determined for the gravity anomaly maps beforeand after stripping. The regional gravity map before stripping shows one positiveanomaly located at the western part of the study area and west Abu-Jir andEuphrates faults. The regional gravity map after stripping shows a positive anomalylocated along an axis extended from Kut toward Najaf. This positive anomaly mapdivided the sedimentary basin into two sub-basins. The positive gravity residualanomaly of the Bouguer map before stripping shows regionally three structural axestrending NW-SE. These axes are Baghdad-Kut axis, northwest Karbala axis andwest Samawa- Nasiriyah axis. The positive residual anomaly map after strippingshows two important anomaly areas. The first area is located between Kut andKarbala-Najaf . and the second is located northwest Karbala by about 100-120 km.These two areas may be prospective areas for hydrocarbon. The stripping methodapplication in the study area shows good result; therefore, it can be used to enhancethe gravity data to investigate deep structures in other areas.

} }