Abstract:

We have found five organic reef bodies in the same strata and I the same area since we discovered an organic reef in the strata of the Upper Permian in Beibei of Sichuan Province in 1983. We have mainly discussed one of the bodies, named Wenxin Reef In this paper. According to its paleo-biological nature and microfacies character, we have proposed that it is a kind of patch reef developed in an open lagoon. The patch reef sedimentary assemblages include:
1. reef-core subfacies;
2. reef-flank subfacies;
3. inter-reef subfacies.
Its development underwent four stages: beginning to grow in the sea-up-shallowing, and then withering in the sea-up-deepening.