Abstract: It is significant effect of studying the fault sealing properties, (i.e. lateral sealing factors such as filling compounds, allocated lithol-ogy of fault walls and syngenetic fault feature; and vertical sealing factors including the fault mechanics, geometry, stress field, faulted overly-ing strata) on determination of the distribution of reservoirs in complex fault block. The block sealing is not simply dependent on the lithology of fault walls, but on the property of fault zones. This paper presents an integrated approach of block sealing analysis with applicability and practicability. From the studies of oil-water contact in reservoir on two sides of the fault, acoustic logging data from over-fault wells and shale smear factor (F_ss), the sealing status of fault is comprehensively estimated. A case is used to demonstrate the good effectiveness for ascertain-ing the lateral and vertical sealing properties of the faults by applying this approach.

Key words: fault, fault block, acoustic logging, Fss, fault sealing property