Abstract:

The Tarim Basin is the largest superimposed basin in NW China, in which the multiple regional unconformities and palaeouplifts developed in the Phanerozoic, and both of them are closely related in their formation and evolution. In this paper, based on the seismic, drilling and outcrop data, the tectonic sequences, the structural architectures of unconformities and the accumulation minimum growth factor in basinscale are analyzed. The distribution, formation and uplifting process of palaeouplifts are better understood, especially in the Hotian, Tazhong, Tabei, Bachu, and Tadong palaeouplifts. The results suggest that the structural deformations and distributions of palaeouplifts during the main tectonic movement phases in the Tarim Basin are coordinated with the tectonism of the peripheral orogenic belts. From the Early Paleozoic to present, six times of migrations of the palaeouplifts had occurred. And each migration had changed and responded to the tectonism of the peripheral basin orogens in the same phase. According to the controlling factors of palaeouplift formation, the uplifts in this basin can be divided into four genetic types, including the fault controlled uplift, the inheritance uplift, the forebulge of the foreland basin and the tectonic palaeogeography uplift. The differential uplifting of the palaeouplifts occurring in their different parts may be significant for the oil and gas accumulation.

Key words: palaeouplift, distribution, migration, genesis, Phanerozoic, Tarim Basin