Abstract:

Deltaturbidite depositional system  is  extensively developed in the Dongying Sag  in the middle Es3, according to the vertical variation of the sand formation. Dongying delta in the middle Es3 is divided from top to the bottom into 19 different stages  they are progressively deposited  into the  the center of the lake basin from east to west; there are three types of sandbodies.  associated with delta front turbidites, they are: sliding turbidite, slump turbidite and distal turbidite. Among them the  slump turbidite is the most  stable one  both in scale and in number, it is the important type  for quantitative research of the front turbidites. The author used the method of control variables to explore the relationship between single factors, and then analyzes the relationship between multiple factors,  and quantitatively researched  the front turbidite of Dongying delta in the middle Es3 to explore the quantitative relationship between the structure of deltaic sediments and the front slump turbidites. The study found that the structural characteristics of delta deposition (the thickness of the front delta strata H, sandstone percentage content x, etc.), the distance of turbidite slip s and the size of slope angle of the front delta α, can be quantitatively determined, and the thickness of the slump turbidite of front delta h and the thickness of the front delta strata H, the front sandstone percentage content x are positively correlated and its negatively related with the distance of turbidite slip s, and has probed into and achieved the mathematical model for prediction of the thickness h of slump turbidite of  the delta front.

Key words:  Dongying Delta, slump turbidite rock, mathematical model