Analysis of HC Accumulation in Yuquan Structure of Xihu Depression at East China Sea

On the basis of the data from the drilled trap, the main controlling factors on HC accumulation in Yuquan structural belt, have been discussed in this paper, including mainly the source rock, HC accumulation time and HC lateral migration conditions, and some new opinions have been put forward about the controlling factors on lateral HC migration in Hugang formation of Yuquan structure. It is believed that the micro break of shear joints on the steep side of fold in the compressive structure is an unfavorable fac-tor, which is often ignored. Through analyzing the factors which might influence lateral HC migration in tectonic zone, two favorable prospects for future exploration in the south part of Yuquan area have been pointed out.