Geological Model Of The Jurassic Section In The State Of Kuwait

Samir Yousif and Ghalib Nouman Abstract Until the end of the seventies, the knowledge of the Jurassic Geology in the State of Kuwait was very limited, since only one deep well was drilled and bottomed in the Triassic sediments. Few scattered wells partially penetrated the Jurassic sequence. During the eighties, appreciable number of wells were drilled through the Jurassic, and added a remarkable volume of information. Consequently it was necessary to analyse the new data, in order to try to construct a Geological model for the Jurassic in the State of Kuwait. This paper includes a number of isopach maps explaining the Jurassic depositional basin which also helps in trying to explain the Jurassic basin in the Arabian Gulf basin. Structural evolution of the Jurassic sequence indicated an inversion of relief when compared with the Cretaceous sequence. In fact, the main Cretaceous arches were sites of sedimentation troughs during the Jurassic period. This fact marks a revolution in the concepts for the Jurassic oil exploration. One of the very effective methods of the definition of the Jurassic structures is the isopaching of the Gotnia Formation. Najmah, Sargelu and Marrat Formations include the main Jurassic reservoirs which were detected as a result of the exploration activities during the eighties. Selective stratigraphic and structural cross sections have been prepared to demonstrate and explain the nature of the Jurassic sediments. Introduction Since the discovery of oil in the State of Kuwait up to 1975, all oil discoveries were related to Cretaceous and Tertiary reservoirs. Only three wells were drilled to test oil in the Jurassic Formations in Minagish, Sabriyah and Burgan areas. The results of testing these wells were negative. After nationalization of the oil industry in Kuwait, a number of deep test wells had been drilled and oil was discovered in two reservoirs within the Jurassic section. Consequently, a development plan was set to develop these reservoirs in Minagish, Magwa, Burgan, Umm-Gudair, Abdulyiah and Dharif areas. This study deals with the regional geology of the Jurassic section in the State of Kuwait, using relevant data from some selective well, which represent the geographical distribution within the main Kuwait area. P. 231