The Controlling of Altyn Structural Belt on Deformation History and Tectonic Evolution of Southeastern Tarim Basin, NW China

Li, Meng ¹; Tang, Liangjie ¹
(1)State Key Laboratory for Petroleum Resources and Prospecting, China University of Petroleum, Beijing, China.

Combined with interpretation of seismic profiles and the characteristics of sedimentary faces together with field investigation,the regional geological sections have been constructed in the southeastern Tarim basin.The tectonic evolution of the southeastern Tarim basin aged from the Mesozoic to Cenozoic has been studied in detailed by the balanced-section technique.Results show that the displacement of Altyn nappe-strike slip fault system since the Mesozoic modifies the former Altyn collisional orogenic belt,which resulted in the formation of a series of Jurassic sedimentary basins within the Altyn Mountain and the southeastern part of the Tarim basin. we have on conducted detailed structural analyses on the basin-mountain range systems in the northern Qinghai-Tibet Plateau to discuss the role of Altyn Tagh fault in(1)development of regional constructional stress field;(2) formation of structures and sedimentary basins;(3)generation of structures that facilitate the migration and capture of oil and gas. The oblique convergence of the Qinghai-Tibet terrane relative to the Tarim basin resulted in the formation of transpressional tectonic regime to the northwestern of the Altyn Tagh fault.Such oblique convergence resulted in a series of strike-slip and thrust faults.For the northern Qinghai-Tibet Plateau, thrust faulting not only provides a viable mechanism for the migration of oil or gas, but also resulted in fault-propagation folds which serve as the favorable capture structure for oil and gas.

AAPG Search and Discovery Article #90135©2011 AAPG International Conference and Exhibition, Milan, Italy, 23-26 October 2011.