SEISMIC FACIES
Facies is a body of rock characterized by a particular combination of lithology lithology, physical and biological, structures that bestow an aspect that different from the bodies of rock above, below and laterally adjacent

The facies concept refers to the sum of characteristics of a sedimentary unit, commonly at a fairly small (cm-m) scale
• Lithology
• Grain size
• Sedimentary structures
• Color
• Composition
• Biogenic content
• Lithofacies(physical and chemical characteristics)
• Biofacies(macrofossil content)
• Ichnofacies(trace fossils)

Sedimentology–concepts
• Facies analysis is the interpretation of strata in terms of depositional environments (or depositional systems), commonly based on a wide variety of observations
• Facies Model is a general summary of a particular depositional system, involving many individual examples from recent sediments and ancient rocks

Dari tulisan di atas kurang lebih yang dilihat dalam analisis fasies adalah karakteristik dalam lingkungan pengendapan. Misal grain size, composition dan sebagainya. Jadi yang bisa digunakan sebagai panduan dalam analisis fasies antara lain, impedance (sensitif terhadap V dan RHO) gamma ray (sand-shale) atau atribut seismik lainnya