Abstract: With the change and development of petroleum exploration types, it becomes very important to identify fractures in the formation efficiently and accurately. In this paper, a theoretical model of Stoneley wave propagation in fractured formation is constructed, and the results show that the reflection coefficient of Stoneley wave is higher when the Stoneley wave passes through the fractured zone. On this basis, Stoneley wave field separation (median filtering) is performed on the acoustic logging data of igneous formation in Liaohe basin, the reflected Stoneley wave is obtained, and the reflection coefficient of fractured formation is calculated. At the same time, the porosity distribution spectrum and interval porosity of the formation are analyzed based on the electrical imaging logging data. The results show that both the energy of the reflected Stoneley wave and the reflection coefficient increase in the fractured formation; The distribution spectrum of electrical imaging porosity is significantly wider, and the proportion of large pores in the electrical imaging interval porosity increases in the fractured formation, which indicats the development of secondary pores (fractures).

Key words: igneous fractured formation；Stoneley wave；electrical imaging logging；porosity , spectrum analysis；wave-field separation