Kuwait lies in the southwestern corner of the Mesopotamian Foredeep Basin of the Arabian Platform which extends between the Interior Platform in the west and Zagros Fold Belt at the east. The sedimentary column thickness ranges between 6,000 and 8,000 m in the south and the north respectively, from Triassic to Pleistocene. This study assessed the petroleum system in Kuwait using two methods; the first one is simulating the basins' construction history along with the changes in the physical properties of the different formations in Burgan and Dibdibba basins, using a Python 1D-Airy isostasy backstripping technique. The second method using the PetoMode® software to calculate the burial history and track the changes in petrophysical parameters through the deposition history. Integrating results with the previous studies gave us an understanding view of the petroleum system forming, hydrocarbon type, charging, and timing of oil generation. Also, the properties like compressibility, subsidence rate, and sedimentation rate. It found that the basins lost from 40 to 45% from the original thickness, while the porosity represents a percent (56-67%) from its original porosity because of the high subsidence rate which averaged by 0.05 mm/yr and kicked many up to 0.2 mm/yr.

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Kuwait state lies at the upper northeastern corner of the Arabian Plate, on the Arabian Gulf, and surrounded by Iraq from the north, the Arabian Gulf from the east, and Saudi Arabia from other sides. Kuwait settled on a thick sedimentary column built from the Permian age to recent; its thickness ranges between 7 and 8 km, take the form of the underneath basement structures. Detailed information has been got about the crustal basement structure under Kuwait state from the analysis of gravity anomaly maps and its consequential depth maps. The Geosoft Oasis Montaj software is used for preparing the geologic cross-sections from the modeling of the gravity profiles. The modeled cross-section provided us with the depth and structures of crustal basement rocks within 6 to 7 km under Kuwait and its associated sedimentary basins with a detailed geometry. We got considerable information about the sedimentary basins' geometry in Kuwait, such as the locations, extension, depth, and dimensions of the basins. This information coincides with Kuwait's oil fields location map. However, this information can be confirmed accurately from an aeromagnetic survey recommended carrying out the Kuwait region.

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We used wireline logs, seismic, core data, fluid analysis, and geochemical data to investigate the total petroleum system in the Cretaceous period. Also, we used thin sections and fluid analysis throughout the investigation. Python’s 1-D backstripping technique was used to determine the abrupt changes in subsidence rates and their effect on the reservoir’s quality. The results defined that the potential reservoirs include, from top to bottom, Mauddud, Upper Burgan, Lower Zubair, and Ratawi Limestone. The reservoir facies reflect different environments between the carbonate ramp (Mauddud, Ratawi Limestone, and Minagish reservoirs), delta plain (Zubair reservoir), and margin shelf (Burgan reservoir), and its quality is graded from Mauddud to Ratawi Limestone from top to bottom. The field lies up-dip under Kuwait Bay and represents the continuation of super-giant Greater Burgan Field. It filled with the spilled oil from the down-dip Raudhatain and Sabriyah fields through a structural saddle. Two major tectonic events subsided the deposited sediments by 0.25 mm/year, besides three minor events; however, these events did not affect all Cretaceous reservoirs but only according to their deposition times. Furthermore, according to burial history, thermal maturity, and reservoirs’ fluid geochemical analysis, the Sulaiy (Makhoul) and Minagish formations are likely the primary sources for all Cretaceous reservoirs.