SOME NEW UNDERSTANDING OF FORMATION OF YA 13-1 GAS FIELD

There have been various hypothesis about the formation of Ya 13-1 gas field since it was discovered.If the process of hydrocarbon generation is combined with the development of geological structure,it will be clear that formation of the field is very complicated.There were 4 stages for formation of the field:(1) deposition of source rocks of Yacheng formation;(2) formation of oil pool;(3) deposition of source rocks of Meishan formation;and (4) oil pool became gas pool as a result of charging of hot gas.It is considered that the Yinggehai basin is dominated by gas pools and the Qiongdongnan Basin by oil pools.