Analysis on sedimentary facies and its evolution based on seismic sedimentology

In order to explore the sedimentary facies and its evolutionary characteristics of coal-bearing formation before and after coal accumulation, the seismic a ttribute optimization based on the minimum isochronal stratigraphic and the lithology and microfacies division of single well sequence stratigraphy were carried out by u sing seismic sedimentology interpretation technique, and the relationship between the sensitive attribute and the lithology and sedimentary facies was established. The se methods and techniques were applied to the study on the sedimentary facies before and after No.2 coal seam accumulation in Shanxi Formation of Zhongyu area in Qinshui Basin. The study results showed that the medium cycle as the minium isochronal strata unit in this region, and the short-cycle can be used as a control to study the deposition phenomenon in the four-fifth order interface. The root mean square amplitude attribute can be used as a sensitive attribute for predicting the sedimentary facies distribution characteristics. The sedimentary environment before accumulation of the No. 2 coal seam in Shanxi Formation was the lower delta sedimentary envir onment, and after accumulation of the No.2 coal seam in Shanxi Formation was the upper delta sedimentary environment. The sedimentary microfacies and their spatial distribution of the diversion channel, natural embankment, flood basin and peat swamp were identified.