THE CAMBRIAN-ORDOVICIAN SEDIMENTARY FEATURES AND STRUCTURAL CONTROL IN THE CENTRAL TARIM AREA

In geological history,the geography transform and sediment environment evolvement of a basin is controlled by its structural characteristics and structural movement.This paper analyzed the sedimentation of the CambrianOrdovician based on the structural background of the central Tarim area,Tarim Basin.Its sedimentary facies are representative of stratification in vertical,which reflect the persistent rise process of sea level on the whole.The sedimentary facies gradually evolve upwards from evaporate platform,localized platform and widen platform to platform edge,shallow shelf,mixture shelf and slope facies in the main area of the Central Tarim Uplift.Moreover,the control actions of structurd movements to stratum sedimentation were discussed in this paper.Researches show that structure uplift to the development of hydrocarbon source rock,structure fractures to the features of overlaying stratum alion and structure palaeogeomorphology to stratum overlap sediment have differentation control actions.