The physical properties of shale oil reservoir are extremely poor

so it is necessary to form a network fracture system through volume fracturing to realize economic and effective development. However

there are lower permeability interlayers both in the top and bottom of shale oil reservoirs

so to master the fracture propagation law of reservoir with interlayers is the key for the successful fracturing of shale oil. With the help of the numerical simulation software

RFPA

of the rock fracture damage analysis system

the influencing factors of fracture propagation in the reservoir interlayers are studied. On the premise of considering the heterogeneity of strata

and by the comprehensively consideration of the elastic modulus

Poisson's ratio

uniaxial compressive strength

tensile strength

horizontal stress difference and interlayer stress difference of the reservoir

the fracability of shale oil reservoir is evaluated by the analytic hierarchy process. The results show that the elastic modulus of the reservoir interlayer

the difference of horizontal in-situ stress and the uniaxial compressive strength of the reservoir are negatively correlated with the degree of crack propagation. As these parameters increase

the cracks are more difficult to expand. However

there is a positive correlation between the ratio of tension and compression of reservoir and the stress difference between layers of reservoir and the degree of fracture propagation

that is

the increase of tensile strength and interlayer stress difference will help to increase the scale of fracture propagation

and the larger interlayer stress difference will make the fractures pass through the interlayers and continue to develop in the interlayer. Meanwhile

the mathematical model of the fracability is established by the analytic hierarchy process in fuzzy mathematics

and applied to the fractured wells in the work area. The predicted results are consistent with the experimental microseismic monitoring results

and the research results can provide reference for shale oil fracturing reform.