Gas seepage as an indicator of deeper prospective reservoirs. A study based on exploration 3D seismic data

摘要: Three periods of sustained gas seepage in geological time have been revealed Danish block 5604/26 the North Sea by use exploration 3D seismic data. The most recent period is indicated a cluster chimneys which ties to buried craters near seabed, and possible present escape through along with amplitude anomalies indicating shallow sand charged migrating from deeper level. indicative vertical migration visible down 1.5 s TWT (1500 ms), therefore interpreted as stratigraphic horizon. Below this level it becomes difficult see due complex faulting. faults may work pathways. geometry indicates that has one point. nearest source an underlying prospect where oil discovery made. Two earlier are mounds, possibly carbonate buildups over seepages Pliocene time, and,similarly, formed time. results study periodical process its presence associated features can be used indicator prospective reservoirs.