During the investigation of hydrocarbon offshore or transit zone fields, site survey is to be performed. The main purpose of such works is exploring subbottom geological section, detection and evaluation processes and features, which may affect on drilling platform stability (0–50 m) or drilling itself (0–400 m). Neglecting first type of geohazards may lead to subsidence, loss of stability and heeling of the oil platform. Neglecting second type of hazards could cause different emergency situations during the drilling. 3D seismic data allows to predict geohazards before site survey and choose best location for it. Standard 3D shallow water seismic data aimed at deposit usually insufficient for subbottom geohazard identification due to 3D survey design features. This paper shows technology of standard 3D transit zone seismic data processing and interpretation for site survey issues.


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