STUDY ON SEDIMENTARY CHARACTERISTICS OF UPPER TRIASSIC XUJIAHE FORMATION IN CHISHUI AREA
赤水地区上三叠统须家河组沉积特征

Based on outcrop and drilling data and considering of regional sedimentary characteristics,both stratigraphic and lithologic characteristics of Xujiahe formation (T_3x) in Chishui area are deeply analysised in this article. The sedimentary characteristics was summarized, then the sedimentary environment was speculated, what's more the petroleum prospect was pointed out. It has been made known that T_3x here belong to fluvial deposit, which devides the braided river and the meander river. The corresponding sedimentary facies are braided river and meander river facies,including two kinds of sub-facies which are stream bed and valley flat. The identified micro-facies involves channel bar, bar point and alluvial flat, valley depression and valley marsh. The prospect of T_3x should lie in the place where joints and faults are windly found, for its own reservoir and source conditions are limited.