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KRIEGERS FLAK OWF GEOPHYSICAL SURVEY RESULTS 20 Figure 10-9 Interpreted depth below seabed (DBS) in m of the Lower Till unit (LT) KF_OWF_Geophysical_Survey_Results_v4.docx
KRIEGERS FLAK OWF GEOPHYSICAL SURVEY RESULTS 21 11. HAZARDS 11.1 Shallow Gas/Organic Deposits Areas with an accumulation of soft organic matter, including peat/gyttja and potential gas are likely to be observed as data blanking areas in the datasets. A distinct area of data blanking and several isolated occurrences have been observed in the sub-bottom data 2 km north of site centre. The data blanking is present in the Upper Till unit; this is likely to be an accumulation of gas which has migrated from an organic rich unit below. Alternatively blanking can be caused by gyttja and peat in Kriegers Flak Clay found in situ or dislocated within the Upper Till unit. The top of the blanking, interpreted at the shallowest depths have been digitised. In some instances seismic ‘phase reversal’ is evident, another indicator of organic deposits and / or gas presence. Figure 11-1 shows depth below seabed (DBS) in m of the Hazard blanking unit (potentially hazardous area). Figure 11-1 Depth below seabed (DBS) in m of Hazard Blanking Unit Figure 11-2 and Figure 11-3 show seismic profiles of the blanking and phase reversal effects. It is possible that diffuse gas could be evident at shallower depths. Figure 11-2 Data Blanking Hazard (Multichannel Sparker Seismic Section, Line 6106300) KF_OWF_Geophysical_Survey_Results_v4.docx
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