Abstract: Based on in-depth study on vertical confining mechanism of fault, three geological models were developed, followed by analyzing the vertical confining properties of fault in three different geological conditions by using pressure exerted on fault surface, the ratio between sandstone and mudstone in faulted strata, and difference of interval transit time between filling material of fault and surrounding rock.It was indicated from actural application that these methods are feasible and practicable for these studies.

Key words: Fault, Vertical, Confining pressure, Sandstone, Mudstone, Ratio, Interval transit time