By using the Ricker wavelet of positive and negative frequencies in 2D seismic data

the calibration of accurate composite seismic traces and structural interpretation are conducted on three marker beds at the bottom of Jurassic Zhiluo Formation(T

4

)in 14 wells.The results show that reverse faults are developed in the western fractural area of the block;four main faults that extend from north to south are sheared by two E-W adjusting faults in the middle;the trap types are mainly faulted anticline

faulted nose

and faulted block.In its eastern part

strata are gentle and faults are not developed;trap type are mainly low-amplitude anticlines.Through the establishment and analyses of the accurate velocity field under the complicated surface conditions

the precision of structural maps of T

4

T

5

and T

6

is greatly enhanced.The proposals concerning the exploration strategy in the block are also put forward based on comprehensive evaluation.