Coupling Relationship Of Multi-scale And Multi-cause Fractures In Jimusar Sag,Junggar Basin

In this paper,according to outcrop,core and thin slice observation,SEM,FMI,2-D Visual O il and Gas Migration Simulation Experiments and rock triaxial test,the coupling relationship of multi-scale(including macro-scale,mid-scale and micro-scale)and multi-cause fractures(including bedding fractures and structural fractures)is studied in detail.Macro-scale research shows that the coupling between the structural fractures and bedding fractures can improve the hydrocarbon-charging efficiency of tight oil and oil saturation of tight reservoir.Mid-scale research shows that the structural fractures and bedding fractures affect each other,interact with each other in the process of formation.When the core that is well bedded is subjected to compressive stress in the direction vertical to the bedding plane,it is easy to produce multi-period fractures and form fracture network which is composed of bedding fractures and structural fractures.When the core that is well bedded is subjected to compressive stress in the direction parallel to the bedding plane,it is easy to produce fracture system,which mainly consist of bedding fractures,with few development periods of fractures.Micro-scale research shows that the parallel coupling relationship between bedding fracture and structural fracture has no significant effect on the permeability of tight reservoir,and the vertical coupling relationship between bedding fracture and structural fracture can significantly improve the permeability of tight reservoir.