Tectonic Subsidence in the AL-Qaryatayn Area

Abstract

We conducted a study of tectonic subsidence in the Al-Qaryatayn area based on well data provided by the General Petroleum Corporation (Al-Qaryatayn Well) from a depth of 100m to 3250m. The study covered ages from the Upper Cretaceous to the Middle Triassic. The results revealed a significant and continuous subsidence phase during the Triassic (S1), linked to the Permian-Triassic rifting event—one of the most important global tectonic events—with a high sedimentation rate (57.2 m/My). 

In the Jurassic, a dominant phase (S2) reflected relative tectonic stability, ending with an uplift of the sedimentary basin floor. Initially, this phase coincided with thermal subsidence but concluded with local uplifts represented by very long wavelengths. This local tectonic event extended along the Palmyride Belt in its northern and southern segments, with a relatively low sedimentation rate (3.6 m/My). 

Subsequently, a major and continuous subsidence phase began in the Cretaceous (S3), associated with the formation of rift systems in the region, such as the Euphrates Graben. This event represents a regional tectonic episode affecting the structure of the Palmyride Belt and adjacent formations, with a moderately high sedimentation rate (14.15 m/My) compared to the Triassic rate.