Dongji subsag is located at the falling fault of Tuo 94
that is on the north of Dongying sag. Delta of plait river is
the main sediment on upper Es3 , especially the front delta
facies of Ninghai plait river originated from the heave of
Chen Jia Zhuan on the north. The rock of the reservoir bed
are mainly fine sandstone. The reservoir has good quality and
favorable conditions for the formation of oil. Since the degree
of exploration is low and the control factors of oil and gas
accumulation in this region are relatively complex , the
regularity of oil and gas accumulation and distribution are not
very clear. This paper summarized the regularity and main
control factors of oil and gas accumulation and generalized the
distribution regularity of oil and gas reservoirs based on the
analysis of the characteristics of configuration , the system of
sediments and characteristics of reservoirs. Furthermore it
pointed out the focus of research and the direction of
exploration for this region from now on.
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