On the basis of the interrelationship of structure and lithology of the trap
the composite traps can be divided into 4 styles
including monoclinal-lithologic trap
anticlinal-lithologic trap
fault block-lithologic trap and nose-lithologic trap. After studying the data of the central structural belt in Shiwu rift
southern Songliao basin
it is found that there are several structural-lithologic composite traps
such as the structure to the west of SN85 well
the structure to the northern SN87 well and North Gujiazi structure. These structural-lothologic composite traps will be the favorable exploration targets in the future.