Abstract: Deep-sea channels are important transportation channels and deposition sites for sedimentary debris to deep-sea basins, and they are the main types of reservoirs in deep-sea sedimentary environments. Aiming at the problems of unclear structural pattern and distribution pattern of sand body inside the channel, and the difficulty of predicting reservoir continuity, we have carried out a research on quantitative characterization method of reservoir continuity in deep-sea channel type. The study takes the deep-sea waterway configuration pattern and characterization results as the constraints, takes the inverse of the product of the lateral and vertical stacking ratio of the sand body as the continuity coefficient, and synthesizes the coupling relationship between the continuity and curvature to realize the quantitative evaluation of the distribution pattern of the continuity of the reservoirs in the deep-sea channel. The study achieves the following insights, the single channel configurations in the study area are divided into three types: isolated (Type Ⅰ), contact (Type Ⅱ), and embedded (Type Ⅲ), corresponding to lateral stacking ratios of >1.00, 0.85~1.00 and <0.85, and vertical stacking ratios of >1.00, 0.80~1.00 and <0.80, and continuity coefficients of 0.96~1.34, 1.37~1.67 and 1.67~2.56, type Ⅰ curvature distribution intervals of 1.00~1.11, type Ⅱ distribution intervals of 1.02~1.28, and type Ⅲ distribution intervals of 1.10~2.28, with continuity decreasing with increasing curvature. The study quantifies the continuity coefficients and curvature distribution ranges of different configuration styles, quantitatively characterizes the stacking relationship between single channel sands, and is of great significance as a geological guide for the efficient production and fine development of deep-sea channel reservoirs.

Key words: Niger Delta, deep-sea channel, continuity, constitutive patterns, quantitative characterisation