Abstract:

Abstract:  Based on the division of the Upper Triassic Xujiahe Formation and the correlation between the field outcrops and the wells in  Guangan Area, Central Sichuan Basin, we have studied the lithofacies association, depositional characteristics and favorable reservoir in detail Braided delta systems and shoreshallow lacustrine systems are the major types of depositional systems of the Xujiahe Formation in  Guangan Area In the study area of the Xujiahe Formation, 11 lithofacies types and 7 lithofacies associations have been distinguished Delta sandbodies are characterized by the superposition of sandbodies of braided channels with those of subaqueous distributary channel The superimposing belts of major channels obviously control the distribution of favorable reservoirs in the braided delta systems, and the transitional zones from the delta plain to the deltafront are the favorable reservoir zones.

Key words:

Key words: Guangan Area, Central Sichuan Basin; Xujiahe Formation; lithofacies association; depositional characteristics; favorable reservoir zone