Methods for the study of sedimentary facies in residual basins——a case study of the Mesozoic basin in Jiyang depression

Through an integrated study of Mesozoic sedimentary characteristics in Jiyang depression,the authors put forward a set of methods for studying sedimentary facies in reworked residual basins.The main concept including the field outcrop,core,sample log,well logging and the basinal structures.Integration research has been done includes sedimentary characteristics of strata,sedimentary facies recognition of core,vertical variation of sedimentary facies,logging facies,seismic facies and sedimentary system distribution.The most important methods are the balanced cross-section and sedimentary analysis of well-to-well correlation sections in seismic restraint.The study approves that Jiyang depression was composed of the lake basins divided up or connect by catches in Mesozoic,and developed the alluvial fan facies,fluvial facies,fan delta facies,delta facies,lacustrine facies and swamp facies.