Abstract: Fractured reservoirs are developed with pores, fractures and caves in reservoir bed, and it is difficult to accurately characterize the reservoir. In order to accurately describe the spatial distribution characteristics of fractured reservoirs, the geological and petrophysical models of embedded multi-scale fractured reservoirs of key wells were established according to logging and drilling data and petrophysical test data; a study was made on the multi-medium connectivity and conductivity and the geological modeling technology of embedded fractures, and the model was used to numerically simulate the fractured reservoirs in the lost oil field. The study results show that the geological modeling based on the multi-scale embedded fracture model can be used for detailed description and numerical simulation of large-scale fractures such as structure and fault, as well as small-scale fractures based on the equivalent principle, and the fitting rate of single-well dynamic indicators was more than 90%. The numerical simulation study of Liuhua Oilfield proves that the reservoir will maintain the current fluid recovery rate of each well for continuous development, most of the wells will not experience serious water flooding, and the wells with higher risk are mainly located near the fault on the northeast edge of the work area. This study provides a reference for geological modeling, numerical simulation and development for similar reservoirs.

Key words: multi-scale, fracture, stress, reservoir, seismic, historical fitting, Liuhua Oilfield