Interpretation of depositional facies from seismic data

摘要: Depositional environments can be predicted from seismic data through an orderly approach to the interpretation of reflections. One keystone this is understanding effects lithology and bed spacing on reflection parameters. Amplitude, frequency, continuity are some parameters most useful for interpreting environments. Reflection amplitude contains information velocity density contrasts at individual interfaces extent interbedding. Frequency primarily a characteristic nature pulse, but it also related such geologic factors as reflectors or lateral changes in interval velocity. Continuity reflections closely associated with bedding (e.g., continuous suggest widespread, layered deposits).A second interpretive parallelism cycles gross and, therefore, physical surfaces that separate older younger sediments. Exceptions concept include (1) fluid contact reflections, (2) limitations imposed by resolution, (3) various non-geologic coherent events. In spite these exceptions, provides powerful tool analysis patterns.Reflection cycle patterns configuration (i.e., layered, chaotic, reflection-free) terminations depositional unit boundaries. The external form analyzed grid lines valuable processes responsible unit. Sheet, sheet drape, wedge, lens, fan, other forms described. areal associations often critical environmental interpretation. Examples facies sections shown ranging shelf basin floor.