Abstract:

Based on 3D-seismic and well logging data, ten high-frequency sequences, i.e.A to J, are recognized in middle part of the third member of Shahejie Formation, Guanglidong 3D-seismic survey region, Dongying sag. This work is carried out through careful interpretation and tracing of seismic data. The size and distribution of different high-frequency sequences are changed in space. Integrated well logging and seismic data indicate that five high-frequency sequences (A, D, E, G and I) developed in the area of well Lai10-3. The high-frequency sequences of A, C, D, G, H and I have a big size, but the other high-frequency sequences have a relatively smaller size. Four lake shrinks and two sediment supply transference to west occurred in the study area during the process of these ten high-frequency sequences developed. The size and distribution of high-frequency sequence are controlled by lakelevel fluctuation and sediment supply, but the most important controlling factor is sediment supply.

Key words: high-frequency sequence, sediment supply, lake-level fluctuation, Dongying sag