Abstract: The Changxing Formation in the middle and south section of Tong Luo Xia Structure was located from deep ramp to shallow ramp depositional environment. There are reefs in the upper section of the Changxing Formation, but not the reef combination. The reservoir pores are dominated with secondary ones, with apparent low porosity and low permeability. The
partly dissolved pores and holes, as well as structure fractures develop well, with strong heterogeneous characteristics. The reservoirs are fractured carbonate rocks. The property of reservoir and the location of the well-developed reservoir are controlled by multi-factors. With the help of seismic velocity inversion and finite element stress modeling, it is found that
reservoir distributes laterally with patch pattern, and relatively develops along the small faults. Generally speaking, the reservoir in the north section of studied area develop better. In addition, it is predicted that two areas with potential reservoir exist in the sub-traps of Ming Yue Chang and Tian Kou Chang.

Key words: Changxing formation, carbonate rock, reservoir characteristics, reservoir rvaluation