Seismic-velocity facies is that velocity data is used in conventional seismic facies study.This includes:1 using drilling data in the study of correspondence between velocity and lithologic characers;2 using double well seismic profile in bridge type correlation in order to find out the correspondency between velocity colour scale and lithologic characters and determine different velocity facies.The Miocene in Ruili Basin

Western Yunnan Province could be divided into hilly complex foreset high velocity facies

sheet subparallel mid-velocity facies

sheet parallel low velocity facies

hilly complex high velocity facies and 4 relative sedimentary facies such as fan deltaic facies

shore-shallow lake facies

mid deep lake facies and near shore subequeos fan facies.