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

Fig. 5. Lithology and sedimentary units of gravity-flow systems. (a) Well W5, fine sandstone, thin mudstone interbedded with siltstone, soft deformation structures and slumping deformation structures are observed, interpreted as slumping deformation layers; (b) Well W3, massive sandstone, with mud gravels in the bottom, fining upward to fine sandstone, graded bedding, showing a positive grain sequence, interpreted as sandy turbidite channel; (c) Well W7, suspended conglomerate deposits, mud gravel are dominant, with coarse gravel and sandy gravel, interpreted as suspended deposits at bottom of sandy turbitite channel; (d) Well W5, very fine-fine sandstone interbedded with mudstone, interpreted as levee-overbank deposits; (e) Well W6, thin mudstone interbedded with turbidite siltstone, parallel bedding well developed, interpreted as lobes deposits. 1—Soft deformation structures; 2—Slumping deformation structures; 3—Gravel.