| The theories foundation of the research based on high-resolution sequence stratigraphy established by T. A. Cross, the concept "sediment volume distribution theory" , " phase segragation" and " basal level cycle transition point" can be applied in the research, combining methods of contributing factor about structural analysis , sequence or sedimentary cycle, sedimentary system and dispersion of sediment in the process of basin evolution. based on the form of single well sedimentary cycle, analyzing deleveling dominate accommodation and sedimentary deposit, predict areal distribution of the different scale sand body . structure factor is predominate position in all the factors of deleveling. With it we can anti- push the structure sport of different scale in period of deposition and the control function to the sand body distribution.Recognized sedimentary cycle style and superposition mode in different region. chang8 upgrowth vertical accretion in Xifeng area. chang6~3 upgrowth progradation and reverse cycle, chang6~2 upgrowth retrogradation and normal cycle, and chang6~1 upgrowth progradation and reverse cycle in Ansai area. Chang4+5~2 upgrowth progradation and reverse cycle and chang4+5~1 upgrowth retrogradation and normal cycle in Jiyuan area.Using single sand body thickness classification, we can better understand the sand layer's distribution of different thickness in plane, better distribution the sand layer's through-going area of different thickness , and provide a better basis for geometric arrangement of well.Through the research, recognized 3 bigger structure activities in chang6 period in Ansai area, the activity can cause the lake basin's accommodation variety as a result each time, it showing diminish- expand- diminish from chang6~3 to chang6~1, vertical section showingTuff and seismites offer evidence in recognizing sediment processing happened structure activity. Using sand superposition style and plane shape,inversion sediment processing happened structure activity. |
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