RESEARCH ON THE SEQUENCE STRATIGRAPHY AND DEPOSITION SYSTEM IN YONGANZHEN DELTA, THE DONGYING SAG

Combining the theory of high-resolution sequence stratigraphy with the log-seismic data analysis,the framework of the strata sequence of E_s³—E_s² for the Yonganzhen Delta in the Dongying Sag was established.In general it is divided into four third-level and nine fourth-level sequences.The sedimentary system study shows that there are several deposition sources in Yonganzhen Delta,and the main deposition sources in the various periods are different.But the most important deposition source is from the Qingtuozi uplift in the east.The article gave a detail analysis on the two main sedimentary cycles of LSC4 and LSC3,consequently got the result of distribution characteristics and deposition sources.And the sedimentary system framework was established.In the end it is considered that the sand bodys in these two periods are the main oil and gas exploration targets.