The Sequence Stratigraphic Framework and the Filling Style of Baiyinchagan Depression
白音查干凹陷层序地层格架及充填样式

Located in Er'lian basin, Baiyinchagan is a depression with faults in the north and overlap in the south. An overall research was carried out on the basis of drill cores, logging profiles, logs and seismic data in combination with the classic pattern of sequence stratigraphic framework by the EXXON Oil Company and the base level cycle pattern of high resolution sequence stratigraphy by T.Cross.As a result,two super sequences and six third order sequences have been identified in Lower Cretaceous Bayanhua Group, the fundamental target bed of this region. In addition, six types of sedimentary facies have been recognized.Among these sedimentary facies, alluvial fans and fan delta are found on the steep slope in the north of the depression, while braid river deltas and turbidite fans are found on the ramp in the south. Three times of lake transgression can be distinguished. It seems that they were formed in early time, developed continuously and reached the largest scale later.