Evolution and controlling factors of the gravity flow deposits in the Miocene sequence stratigraphic framework, the Lower Congo-Congo Fan Basin, West Africa

CHEN Hua,LIN Changsong,ZHANG Zhongmin,ZHANG Demin,LI Ming,WU Gaokui,ZHU Yixuan,XU Hai,LU Wenming,CHEN Jihua

Table 1 Seismic facies of gravity-flow channel system.

Seismic facies Seismic facies Sedimentary interpretation Seismic profile Continuity Amplitude Frequency External form SF1 Poor Weak Medium-high Mound-shaped, chaotic reflection Mass transport deposits SF2 SF2-1 Intermediate-good Strong at the bottom, weak in the internal Medium-low U-shaped, V-shaped Debris flow deposits at the bottom of gravity- flow channel SF2-2 Poor Strong Medium-low Crescent-shaped, imbricate reflection Lateral aggradation body SF2-3 Poor Strong Medium-high Semicircle-shaped, parallel reflection Abandoned channel deposits SF2-4 Poor Medium-strong Medium Mound-shaped, inconspicuous, oblique reflection, nearly fan-shaped Overbank deposits SF2-5 Poor Weak Medium-high Elongated crescent-shaped, inclining at the bottom Slumping deposits SF3 Intermediate-poor Weak in the middle, strong on two sides Medium Gull wing shape Chanel-levee complexes SF4 Intermediate-good High Medium-high Parallel-subparallel reflection Lobes