Abstract
The foreland basin extending through the Persian Gulf is one of the world's most prolific petroleum resource-bearing regions. The structural evolution of parts of that basin has been strongly influenced by Late Proterozoic/Early Cambrian Hormuz Salt formation movements, which have also controlled the distribution of petroleum resource accumulations. Fields SP and BL are characterized to distinguish the tectono-sedimentary evolution of the central and eastern parts of the basin, respectively. Field-SP is located within the Qatar Arch in the central part of the basin, whereas Field-BL is situated in the southeastern part of the basin and is tectonically influenced by the Hormuz Salt movements. 3D seismic data and information from two exploration wells are assessed in detail to define and compare the deformation history of the Permo-Triassic succession in these two fields. The Dalan (Upper Permian) and Kangan (Lower Triassic) formations and their equivalent Khuff Formation to the west host more than thirty-three known gas and gas-condensate fields within the basin that have evolved structurally in this tectono-sedimentary setting. This study integrates 3D seismic, well log, core, and thin section analysis from two wellbores drilled in the two studied fields. It applies seismic stratigraphic methods and principles to distinguish the architecture of relevant depositional tracts and interfaces and determine how they have evolved through geologic time. The results reveal that the different thicknesses of the Hormuz Salt (Cambrian) underlying the two studied fields, and the salt tectonic activity it has driven, are ultimately responsible for the distinctive structural evolutions and Permo-Triassic reservoir qualities observed in those fields. The significance of this finding is that by applying the developed seismic stratigraphy techniques integrated with existing well data on a regional basis offers the opportunity to identify undrilled exploration targets with an improved chance of containing high-quality Dalan/Kangan reservoir sections.
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