Offshore oilfields are characterized by large well spacing, sparse well pattern, and strong reservoir heterogeneity. Taking the 5th member of Wenchang formation (Wen 5 member) of Paleogene in L14 oilfield, Lufeng sag, Pearl River Mouth basin, as an example, a method for characterizing the architectures of continental braided river delta reservoirs based on “hierarchy constraint, subdivided dissection, pattern fitting, logging-seismic cross-feedback and multidimensional coordination” was proposed. By using frequency-dividing RGB fusion technology, the architecture units of the reservoirs were characterized. On the basis of reservoir architecture division, high-quality reservoirs were predicted. The results show that the third-order architecture unit in the study area is composite distributary bar, and the fourth-order architecture unit is composed of distributary bar, distributary channel and braided channel. The fourth-order architecture unit is found with three vertical stacking styles and two lateral splicing styles. The rock mineral components and architecture units play a leading role on physical properties. In the Wen 5 member, Class Ⅰ reservoirs are dominant and mostly distributed in distributary bars; Class Ⅱ reservoirs are mainly distributed in the outer edge of Class Ⅰ reservoirs, with poor continuity; and Class Ⅲ reservoirs are often associated with Class II reservoirs, with the poorest continuity. From the center to the outer edge of the distributary bar, and then to the distributary channel and braided channel between the distributary bars, the reservoir quality gradually decreases.
