The shale oil reservoirs are characterized by low oil and gas abundance

poor permeability

no natural productivity or lower natural production capacity in single wells compared with the lower limit of commercial oil flow

and fast energy decay

etc.The application of efficient volumetric fracturing technique to horizontal or multi-lateral wells is the key to achieving efficient development of shale oils.In order to evaluate the fracability of the shale oil reservoir in the Lucaogou Formation in Jimusaer sag

sufficient experimental and theoretical studies were carried out.The characteristics of deformation and failure

mechanical strength and their lateral variations in the Lucaogou oil-bearing reservoir in Jimusaer sag were recognized.And a new method for evaluating the fracability indexes was established based on the analysis of the factors influencing the shale reservoir fracability in the Lucaogou Formation.The results show that due to the significant brittleness of shale under deformation and the well development of fabric planes such as bedding and micro-fractures

the intrinsic geological and mechanical conditions of the Lucaogou Formation are favorable for the formation of complex fracture networks under fracturing.There are interlayers characterized by high rock mechanical strength and in-situ stress in the Lucaogou shale reservoir.Therefore

to maximize the effective volume of fracturing in such reservoir

the artificial fractures should be designed to increase the connectivity between upper and lower reservoirs

while the fracture networks should be as complicated as possible.Besides

a new fracability evaluation method was established using brittleness index

horizontal stress difference

interlayer stress difference and fracture ductility

which can simultaneously characterize the ability of volumetric fracturing network in horizontal wells and the vertical connectivity of artificial fractures.The analysis based on microseismic fracturing monitoring shows that the fracability index evaluation method is very suitable to evaluate thin alternating shale formations typically shown in the oil shales in Jimusaer sag.