关键词: 生物礁, 礁类型, 构造, 沉积, 川东北地区

Abstract:

Organic reefs of Permian Changxing Formation have been the main reservoir in northeast of Sichuan Basin. The reef types of Permian Changxing Formation are shelf margin reef and shallow ramp reef which are distributed in both sides of LiangpingKaijiang shelf. The shelf margin reef developed in Puguang area while shallow ramp reef developed in Yuanba area. Most reefs of Permian Changxing Formation appeared at highstand stage. Compared with shallow ramp reef, shelf margin reef had the characteristics of larger scale, less reefbuilding stages and relatively homogeneous reefbuilding organisms. The reef type was controlled by tectonics and sedimentation. The tectonic difference controlled the potential of reef and the sedimentary difference controlled the scale of reef.

Key words: organic reef, reef type, tectonics, sedimentation, northeast of Sichuan Basin