1 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation，Southwest Petroleum University，Chengdu 610500，Sichuan 2 Research Institute of Exploration and Development，Xinjiang Oilfield Branch，PetroChina,Karamay 834000，Xinjiang
Abstract：Based on 3D seismic data，through fine well-to-seismic calibrations and structure elucidations，this paper has found out the position and type of the pinchout lines of different lithohorizons in the Jurassic Badaowan Formation in Chepaizi area of Jungar Basin;meanwhile，it has also discussed the controlling of pinchout line formed by the extent of palaeogeomorphology variation.The sedimentary palaeogeomorphological features of different lithohorizons have been shown after stratigraphical thickness analysis and seismic layer flattening. By analyzing the fault controlling effects of palaeogeomorphology，together with tectonic evolution profiles，we have systematically illustrated the palaeogeomorphology evolution and the altered palaeogeomorphological features. After analysis of seismic property，reservoir seismic inversion and sedimentary facies，especially the focus analysis on the controlling of deposition and lithology by palaeogeomorphology，we have revealed the characteristics of the sedimentary facies and lithology distribution of reservoir intervals in this area.The sedimentary palaeogeomorphology of Badaowan Formation in Chepaizi area undulates obviously，showing the slope-uplift-depression combination features; meantime, the slope gradient plays an important role in controlling the type of sedimentary facies，lithology and the sediment grain size.The shape and amplitude of low uplift in Badaowan Formation varies greatly during different deposition stages，while the tendency of gathering sand is more apparent when uplift amplitude increases.The valley is not only the channel to transport sediment，but also the key place to accumulate sand，due to which，the sand body distribution of nowadays is closely related to the valley extention direction.
Zhou Lu,Wei Hong,Tang Yong et al. Sedimentary palaeogeomorphology and lithology distribution of the Jurassic Badaowan Formation in Chepaizi area of Jungar Basin[J]. JOPC, 2013, 15(3): 383-400.
