The envelop capacity of seal influence the formationand and scale of reservoir . the main kind of trap is structure trap as anticlinal or fault anticlinal with high closure height and big area . so the trap is put into effect and its formation match the period of hydrocarbon runoff 孔雀河斜坡圈闭类型以背斜和断背斜等构造圈闭为主，闭合面积幅度大，落实程度较高，而且圈闭形成期与排烃期相匹配，在现阶段圈闭条件不是影响成藏的主要因素。
