## 3 Data and Method
### Methods  
3.3.1 Interpretation of Lithology, Seismic Well-Tie, Horizons-Faults, and Seismic Attribute Analysis  
The interpretation of lithology comes from gamma-ray and deep resistivity logs of Caravel-1 (Figure 3). This included check-shots data used for the seismic-well tie process to relate the seismic interpretation to their appropriate depth and stratigraphy. Since there are no DEN and AC logs in the interval of interest, synthetic seismograms are only available at the deeper part of Caravel-1 (Figure 3). The information on stratigraphy, ages, and regional events were obtained from [PERSON] and [PERSON] [36], [PERSON] and [PERSON] [38], [PERSON] and [PERSON] [44], [PERSON], [PERSON], [PERSON], [PERSON], [PERSON], [PERSON], [PERSON], [PERSON], [PERSON] and [PERSON] [46], [PERSON], [PERSON], [PERSON] and [PERSON] [47], and [PERSON], et al. [48]. In addition, biostratigraphy data of the Galleon-1 wellbore, together with their seismic reflector, were used to constrain the geological age of the studied interval (Figure 1b). Other wellbores (including the wellbore from Ocean Drilling Program) are located far from the studied area, with no detail correlable seismic markers (Figure 2). Seismic interpretation began with faults and regional correlation of the horizons. Seismic time to depth conversion was performed using a simple velocity model (interval velocity) that integrated the time-depth relationship from Caravel-1 wellbore data with regional velocity values from [PERSON], et al. [49] within the interpreted horizons. This process is important for calculating the morphometric elements of submarine channels in thespatial rather than the temporal dimension. Manual interpretation of incision surface resulted in the characterization of 18 single submarine channels (Figure 4a) grouped into four different types (Figure 4b). Furthermore, the root mean square (RMS) of the seismic amplitude was analyzed for several depth slices of the four channel complex types. The RMS seismic attribute can assist in delineating geological features or channel bodies [50]. In addition, several other attributes that are well known for channel delineation (e.g., curvature, instantaneous frequency, sweetness, and variance) are also indicated as obvious channels features (Figure S1). Figure 4: (**a**) Three-dimensional view of 18 continental slope channels complexes with inline and crossline seismic amplitude (the 4 represented channels complexes are marked by the blue color), and (**b**) Plan view of the 4 represented channels complexes. See Figure 1a for coordinate information. 3.2 Morphology of Channels Complexes Erosional Surface and Seismic Facies Analysis of Its Filling Deposits  
In this study, the erosional surface of the channel complexes consists of flank, thalweg, terrace, and wall (Figure 5). The channel erosional surface is identified as a low area on the horizon, with the lowest point being the thalweg. The flank is an area outside the overspill point of the channel. Furthermore, the wall is a steep-sided area on an erosional surface, and the terrace is defined as a topographically flat area between a thalweg and wall (Figure 5). These morphologies of the erosional surface have been defined based on the works of [PERSON] and [PERSON] [4], [PERSON], [PERSON], [PERSON] and [PERSON] [17], and [PERSON], [PERSON], [PERSON], [PERSON] and [PERSON] [19]. Figure 5: Erosional surface morphology of the channel’s complexes and the seismic profile of each representative channel complexes in the study area represent sediment transport direction from west to the east. Note that the dashed line is the interpreted position of the erosional surface before it is cut out by the younger channel, while the red line is the younger channel. After interpretation of the erosional surface, seismic facies analysis was performed to be able to interpret the depositional environment and lithologies from seismic reflection data using several seismic reflection parameters: configuration, continuity, amplitude, frequency, and interval velocity [51].