Fault Vertical Segmentation Growth and Determination of Oil Source Fault in Fuyang Oil Layer in Sanzhao Depression

It is proved that fault possesses a typical characterisc of vertical segmentation growth if there is competent difference according to field observation, typical seismic analysis and physical modeling. Fault evolution can be divided into three stages by competent difference: formation of lower fault,segmentation of upper and lower fault and formation of thoroughgoing fault. Taking Sanzhao depression as an example, rock mechanical properties and fault−related fold theories prove that there widely exists faults in sandstone layer of Fuyang oil layer, whose propagation is stopped by mudstone in Qingshankou formation member, leading to the formation of fault vertical segmentation growth. Combining reservoir careful anatomy, it can be indicated that the main oil source faults of the “reversed” migration in Fuyang oil layer must keep active in hydrocarbon migration and accumulation period connect oil source and reservoirs, and segment vertically growth in Sanzhao depression.