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安棚深层系主要指埋深大于2800m的地层,层位以核三下亚段为主的勘探目的层系。沉积模式为靠山型扇三角洲复合体,主要发育扇三角洲前缘和前扇三角洲两种亚相,进一步细分为近岸水下分流河道、远岸水下分流河道、河口坝、席状砂、河道间和前扇三角洲泥六种沉积微相。近岸水下分流河道和远岸水下分流河道在研究区的分布较广。致密低渗是该套储层突出特点,砂体类型对储层物性有明显的控制作用。研究区中远岸水下分流河道微相、河口坝微相的储集性能较好,是安棚深层系的主力油层。
Anpe deep system mainly refers to the depth of more than 2800m buried strata, the level of sub-three sub-core-based exploration purpose strata. The depositional model is a facies-fan-delta complex that mainly consists of two subfacies of fan delta front and fan delta. It is further subdivided into nearshore subaqueous distributary channel, far offshore distributary channel, estuary dam, sheet sand, Six kinds of sedimentary microfacies between the channel and the former fan delta. The near-shore underwater distributary channel and the far-shore underwater diversion channel are widely distributed in the study area. Tightness and low permeability are the prominent features of this reservoir, and the sand body type has significant control over reservoir physical properties. In the study area, the microfacies of the underwater distributary channel and the estuary dam in the study area have better reservoir property and are the main oil reservoirs in the deep shelf of Anpeng.