STUDY ON FACIES PATTERNS DURING THE MIGRATION OF THE UPPER TRIASSIC HYDROCARBON IN THE WEST SICHUAN DEPRESSION

In this paper,study is focused on the facies patterns during the migration of the Upper Triassic natural gas in the middle part of the West Sichuan Depression from microcosmic angles.It is suggested that the migration of natural gas in this area have experienced water-vapor+water- vapor facies pattern transformation.This provides basis for the correct understanding of regularities for hydrocarbon enrichment and exploration targets in this area.