L11 oilfield is located in the eastern part of the South China Sea and is a reef limestone reservoir. L11 Oilfield develops multiscale fractures, and a percolation system is complicated. The well testing analysis of conventional fracture reservoirs can be described by ω and λ (storativity ratio and interporosity flow coefficient), but triple porosity system (matrix- small fractures- sparse fractures) cannot be described by two or more parameters because the coupling between porous media is not unique. Generally, the horizontal interval of well testing curves in L11 Oilfield can be interpreted as homogeneous reservoir, but the real reservoir is heterogeneous. In this paper, fracture modeling is built efficiently, and the sensitivity of fracture parameters is analyzed. Based on the well testing curves, the multi-stage coupling of percolation is reconfigured. Using the forward modeling method, combining the basic fracture net and sparse super-fractures, a serious of log-log curves are obtained to describe the percolation in triple porosity system. The model’s predictions confirm that even in cases of sparse ultra-fracture development, a horizontal segment can still appear in the well-testing curve. The predictions also deny previous assumptions about apparent homogeneity or boundary effects, which provides the guidance for the policy decision of oil field development.