Abstract:

By using the high resolution sequence stratigraphy theory, the sequence stratigraphy for the first member of Dainan
Formation in Jinnan-Yaotan block of Jinhu Depression is analyzed together with comprehensive research of seismic, core and well
logging data. Two kinds of transitional surface, sequence boundary, and flooding surface are recognized. And the aimed segment is
divided into one long-term cycle, two to three intermediate term cycles and four to seven short-term cycles. The main types of the
short and intermediate term are upward-deepening, and upward-deepening then to upward-shallowing. The long term is upwarddeepening
then to upward-shallowing. Based on the principle of isochronic correlation, the sequence stratigraphic framework of
the first member of Dainan Formation is established, and the sandbodies of intermediate term cycles are tracked and correlated.
The result shows that the upside of Shigang Fault and the Lvzhuang tectonic zone are loss of the MSC3, the sandbodies are mainly
distributed in the west of Jinnan area and the downside of Shigang Fault， the character of stratigraphic onlap is apparent. This
kind of sandbody is a very favorable target for subtle reservoir exploration.

Key words: Jinhu Depression, Jinnan-Yaotan, the first member of the Dainan Formation, high resolution sequence stratigraphy