In the southwestern Tarim Basin

studies on the paleo-uplift and shelf divergence have focused on the sedimentary evolution and sequence filling during the Cambrian period. This research used zircon U-Pb dating and well-seismic technologies. The findings indicate that Cambrian deposits overlay the basin's basement structures

particularly in the Bachu uplift area. The Cambrian sedimentation patterns closely mirror the underlying basement tectonics. Influenced by these tectonics

along with tectonic movements and sea-level changes

four distinct sequences emerged in the Cambrian: the Yuertusi to Xiaoerbulake formations

the Wusonggeer to Shayilike formations

the Awatage Formation

and the Lower Qiulitage Formation. Additionally

seven sedimentary facies and ten depositional sub-facies were identified. From the first to the third Cambrian sequence

spanning the early to middle Cambrian

the area transitioned from a platform to a gentle slope

then to a steeper slope and finally to a deep shelf. This progression indicates a retreat towards the sea

fostering the development of Cambrian source rocks. In the late Cambrian

during the fourth sequence

the southwestern Tarim Basin transformed into a restricted platform. This period marked the establishment of the sedimentary framework in the Tarim Basin

with distinct eastern basin and western platform regions.