Controlling Effect Of Tectonic On Depositional Systems Of Daerqi Region In Baiyinchagan Sag

The study of tectonic control on depositional systems of the Upper lower Tenggeer formation of daerqi area in baiyinchagan sag was based on core observation,well logging data,well testing,seismic techniques,data of analysis analysis assay data.Studied the structural feature,paleogeomorphology recovery,the characteristics of sedimentation,and further analysised the control of structure-paleogeomorphology on the deposition.According to the integrated analysis analyses of well logging and seismic data,divided the Upper lower Tenggeer formation into two cycles(Z1 cycle of sequence ?1 and Z2 cycle of sequence ?1 from bottom to up).Interpretated the structural characteristics of the isochronous stratigraphic framework and recovered the paleogeomorphology of the Upper lower Tenggeer formation by using layer leveling technology,.then analysised the major paleogeomorphology units developed in this area,consisted of palaeohigh and palaeo-gully,fault slope break zone and fault transfer zone.There are braided-fluvial delta and lacustrine facies developed in the Upper lower Tenggeer formation.which are indicated by the facies marks of both petrography and geophysic,as well as the analysis of single-well facies and cross-sectional facies.According to the researches of substrate morphology lithological distribution and seismic reflection study,there are two main source directions in the study area,the southeast and northeast direction.Use the sandstone percentage,logging facies,,seismic faciesa and the characteristics of plane seismic facies distribution and seismic attributes,combined with source direction,comprehensively analysize the facies characteristics and distribution of sedimentary layers in the study area.Researched the influence of paleogeomorphology units on provenance,accommodation space,transport paths and distribution of sand body,we understand that palaeohigh and palaeo-gully control the source and pathway of entering lake basin.,at the same time,it is also the significant place where deposition occurred,The area mainly developed W-shaped palaeo-gully moreover,there are multiple provenance directions.Complex faults and their combinations in the study area affect the accommodation space There are fault transfer zone in the west of the area,which form the low structural position,the position changed the direction of sand transportation and deposition location.Influenced by the characteristics of faults development,reverse fault slope break zone developed,the sediments and distribution type of sand body developed in the two sides of slope break zone changed sharply.