This paper studied the reservoir of P

z

layer in A oilfield.Fine cross-well calibration by using the technique of log-seismic integration can improve the lateral continuity and reliability of stratigraphic correlation.Mo-dern karst patterns were introduced to guide basement top structure interpretation

and to delineate pinch-out line and structural trap.The newly found buried hill structure is 52.7 km

2

which increase the exploration area.We divided the palaeogeomorphology into peak-cluster depression

peak forest valley and paleo-erosive gulley with 3D visualization technique.Based on integration of geologic data

logging data and seismic response

we divided the reservoirs into three types including cavern-pore fracture-pore and fracture types.We delineated the distribution of the reservoirs through seismic inversion and ant tracking modeling.Type Ⅰ reservoirs(i.e.cavern-pore type)mainly occur on paleo-structure highs and their thickness enlarge along with their increasing height.Type Ⅱ reservoirs(i.e.fracture-pore type)distribute at the slope of the structure.Type Ⅲ reservoirs (i.e.fracture type)occur near faults

thus are significantly affected by the faults.