A REVIEW OF SYNSEDIMENTARY FAULTS

ynsedimentary fault is the most basic geological tectonic type of sedimentary basin. It controls the spatial distribution,geometric shape,internal sedimentation,and oil and gas reservoir distribution of the basin. According to advances of home and abroad,we summarize and discuss the research status of synsedimentary fault from the aspects of characteristics and classification,secondary structures,research methods,genesis,and evolution theory. We believe that the fine detection,quantitative evaluation,and high-precision simulation of synsedimentary fault are the key points of future research. Based on the development characteristics of some structural ground fissures and the characteristics of synsedimentary faults,we propose the concept of synsedimentary ground fissures. Taking Xi'an ground fissures as an example,we expound the characteristics of the synsedimentary ground fissure,and point out that the research on the development mode,formation mechanism,fracture propagation effect and influence zone width of the ground fissure is the direction of the tectonic ground fissure research in the future.