Tectono-stratigraphic units division for the Upper Cambrian through Upper Cretaceous successions of the Wadi Sirhan Basin, SE Jordan: a case study of stratigraphic features and implication for hydrocarbon prospectivity

A new Upper Cambrian through Upper Cretaceous tectono-stratigraphic units framework has been developed for the southwestern portion of the Wadi Sirhan Basin in Jordan based on the interpretation and integration of key well results and a regional grid of 2D seismic data. Seismic lines through this area, tied to vertical seismic profiles from four wells, defines stratigraphic boundaries. All stratigraphic boundaries are based on fair-to-good continuous markers, with strong stratigraphic boundary reflectors. Seven tectono-stratigraphic units have been identified within the subregional geoseismic sections: tectono-stratigraphic unit A corresponds to the Lower–Middle Cambrian strata; tectono-stratigraphic unit B corresponds to the Upper Cambrian strata; tectono-stratigraphic unit C corresponds to the Lower–Middle Ordovician strata; tectono-stratigraphic unit D corresponds to the Upper Ordovician strata; tectono-stratigraphic unit E corresponds to the Silurian strata; tectono-stratigraphic unit F corresponds to the Lower Cretaceous strata; and tectono-stratigraphic unit G corresponds to the Upper Cretaceous strata. A geological model has been devised to illustrate the geometry of the tectonic structure and major fault sets where differing trends have been recognised. The Zakimat Al-Hasah Fault is a major E–W-trending fault downthrown to the north that must have been active as a normal fault formed during the Cretaceous, and was rejuvenated in recent time. Other major faults include a NW–SE-trending fault with a northeast downthrow; a NW–SE-trending fault with a southwest downthrow; a WNW–ESE-trending fault with both a south and a north downthrow; and an E–W- to ENE–WSW-trending fault with both a south and north downthrow. The tectono-stratigraphic model provides new constraints on potential structural style controls and illustrates the stratigraphic position of the accumulation features and more clearly demonstrates an explorationist's interpretation of the origin and migration route of hydrocarbons.