Abstract：Using data from cores,well logging,seismic and core enperiment,the sequence stratigraphy analysis and sedimentary facies identification of the Paleocene of Haian Depression in Subei Basin are conducted.The distribution and allocation relations of the sedimentary sequence system are obtained,revealing the distribution regularity of the major reservoirs in this area.The work shows that the Haian Depression had undergone four tectonic uplift movements(Yizheng movement,Wubao movement,Zhenwu movement and Sanduo movement) during the basin fault-depression stage from Taizhou Formation to Sanduo Formation periods,and 3 secondary-order sequences were formed.In those secondary-order sequence stratigraphic frameworks,the Paleocene of Haian Depression can be divided into 7 third-order sequences and 17 system tracts,and the main oil bearing system tracts include the lowstand system tract of SQ1-1,SQ1-2 and SQ3-1,the highstand system tract of SQ1-3,and the lake transgressive system tract of SQ2-1.There are 4 kinds of sedimentary systems identified in the main oil bearing system tract,including fan delta,river delta,braided delta and lake facies.The differences of sedimentary characteristics and the space location relationship of the system tracts cause the different matching relationship of favorable source-reservoir-cap assemblages,including the source-reservoir-cap assemblages of the lowstand system tract of SQ1-1,SQ1-2 and SQ3-1,the source-reservoir-cap assemblages of the highstand system tract of SQ1-3,and source-reservoir-cap assemblages of the lake transgressive system tract of SQ2-1.
冉怀江, 司宝玲, 陈方鸿, 范乐元. 海安凹陷古近系沉积层序及对油气藏的控制[J]. 石油地球物理勘探, 2012, 47(5): 795-802.
Ran Huai-jiang, Si Bao-ling, Cheng Fang-hong, Fan Le-yuan. Sedimentary sequences in Haian Depression and control on reservoir of the Paleocene. OGP, 2012, 47(5): 795-802.
