衰亡期 meaning in English

decline phase

2 . the new idea about classification of oil and gas accumulation unit for exploration have been put forward , which holds the sound basis for the perpendicular and plane position and prediction of carbonate reservoir in feixianguan guan group . 3 . the depositional systems of feixianguanguan group in taphrogenic consist of carbonate platform facies ( include oolitic bar , oolitic beach , lagoon , flats ) , margin shelf and trough . there are five development staged in taphrogenic trough
3 、指出裂陷槽中飞仙关组沉积体系在平面上由碳酸盐岩台地相(包括滩坝相、鲕滩相、泻湖相、潮坪相) 、陆棚相、裂陷槽相组成，裂陷槽经历了发生期、发展期、稳定期、过渡期及衰亡期五大发展演化阶段，每一阶段各发育不同的沉积相，且以一种沉积相为主。