Abstract:

Abstract:Lunnan low uplift,located in Tabei uplift of the Tarim Basin,is a huge complex play fairway with multiple oilbearing layer series and large hydrocarbon reserves.Lunnan low uplift has undergone multistage complex tectonic movement since its formation.According to the fine interpretation of twodimensional seismic lines and the reflectance signature of the truncation and onlap on seismic profiles,this paper identifies 11 important unconformities and six major faults including Luntai,Lunnan,Sangtamu,etc.These faults were mainly thrusts at early stage,and they kept active in the Late HercynianIndosinian period and their activity peaked during the Permian.This is different from the previous suggestion that the faults were developed in the Late CaledonianEarly Hercynian.Tectonic inversion occurred at the end of Paleogene,and this is consistent with previous studies.Tectonic evolution profiles show that the study area mainly goes through five stages of tectonic evolution.Among these 5 stages,the Late HercynianIndosinian was a period when intense compression,uplifting and erosion occurred and exerted great effect on the features of the study area.While in the Himalayan period,strata of the study area were tilted and changed from previously “low in the south and high in the north” to nowadays “high in the south and low in the north” due to the rapid wedging of Indian Plate into Eurasian Plate,and the features of the study area were finalized.

Key words:  , Key words： tectonic evolution,tectonic inversion,denudation reconstruction,Lunnan low uplift,Tarim Basin