Coring, geophysical logging, and in-situ temperature measurements were performed with the MARUM-MeBo200 seafloor rig to characterize gas hydrate occurrences in sediments of the Danube deep sea fan, off Romania, Black Sea. The new drilling data showed no evidence for significant gas hydrate saturations within the sediments but the presence of free gas at the depth of the bottom-simulating reflector (BSR). In-situ temperature and core-derived geochemical data suggest that the current base of the gas hydrate stability zone (BGHSZ) is ∼20 m shallower than the BSR. Investigation of the seismic data around the drill sites shows several locations where free gas previously trapped at a former BGHSZ migrated upwards forming a new reflection above the BSR. This shows that the gas hydrate system in the Danube deep sea fan is still responding to climate changes initiated at the end of the last glacial maximum.

使用MARUM-MeBo200海底钻机进行取心，地球物理测井和原位温度测量，以表征罗马尼亚黑海附近多瑙河深海扇沉积物中的天然气水合物发生。新的钻探数据没有显示出沉积物中气体水合物饱和度显着的证据，而是在底部模拟反射器（BSR）的深度处存在游离气体。原位温度和岩心衍生的地球化学数据表明，天然气水合物稳定区（BGHSZ）的当前基底比BSR浅约20 m。对钻探地点周围地震数据的调查显示，先前捕获在前BGHSZ处的游离气体向上迁移并在BSR上方形成新反射的几个位置。