Structural Features Of The Eastern Part Of Kuqa Depression In Jurassic

Kuqa basin is one of the teetonic unit of oil and gas resources in Tarim Basin, since 1958 Yiqikelike oil filed was found in middle Jurassic reservoir in the eastern part of the Kuqa Depression.researcherse done a lot of the area of kuqa depression,This paper focuses on the structural characteristics of Jurassic of the eastern part of the Kuqa Depression and try to reveal the characleristics of teclonic formation.development and evolution since the Jurassic.which will help to reveal the interaction characteristics between the south Tianshan orogan and the Tarim Basin since the Jurassic and provide new information for the basins and orogenic belts in this area.On the basis of the previous work.we through the detailed study of The surface geology. combined with the basic theory of the foreland basin.analysis of Kuqa basin stratigraphy. structure,drilling and seismic data comprehensively.especially the information on Jurassic. we obtain the following conclusions:(1)We established the TJ2k tectonic map of the eastern kuqa depression.which comprehensively reveals the Jurassic structural configuration of the research area.Two Jurassic structural characteristics of the eastern luqa depression can be clearly reflected from the tectonic map:â‘ North-south zonation:the deformation force is decreasing and the formation time of the fold is young from north to south.â‘¡East-west segmentation:the western develop limear fold and the eastern develop short axis fold,since the Cenozoic.(2)The Difference of deformation strength between Yiqikelike belt and Tugeerming did not result from the diversity of the south Tianshan's southward thrust movement.but mainly due to the differece of the South Tianshan piedmont fold-thrust belt's consumption mechanism of displacement in the two structures:The Tugeerming tectonic belt's thrusting activities with the characteristic of post-expansion:the Yiqikelike tectonic belt's thrusting activities with the characteristic of previous-expansion.(3)The analysis of seismic profiles of northern margin of the study area think that the Jurassic of the Ming North tectonic belt is widest of the Jurassic ocerlaid by the South Tianshan thrust nappe.at least 9.58km.(4)Basing on the analysis of the stratigraphic contact.the structural style in the seismic profiles.growth strata.etc.in the study area.it thinks that the Yiqikelike anticline and the Tugeerming anticline already have a prototype during the early Cretaceous late and the late Cretaceous late yanshan movement, but they were forming since from the Kuqa period.