SEAL MECHANISMS OF DIFFERENT TRANSPORTING PASS WAYS OF FAULT AND THEIR RESEARCH METHODS

Based on the study of types and characteristics of transporting passways in faults,two types ofvertical seal mechanisms of faults were divided.A vertical seal mechanism of fault is tight and heal sealmechanismfor tip fractures or connected pores of fault zone filled mainly with mustone.Another verticalseal mechanismof fault is diagenetic cementation seal mechanismfor vertical fractures or connected poresof fault zone filled mainly with sandstone.A method studying the tight and heal seal mechanism of faultwas established by using the relationship between surround pressure on fault and plastic deformationli mitof mudstone.Another method studyingthe diagenetic cementation seal mechanismof fault was establishedby using whether deposition of silica and carbonate or not.These method were appliedin studyingthe ver-tical seal mechanismof main fault in the first member of Damoguaihe Formation,the north of WuerxunDepressionin the Hailar Basin.The research results are accordant with actual geological conditions.It in-dicates that the methods are practical to study the seal of different transporting passways of fault.