赵凹油田安棚深层系沉积体系研究

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。

Sedimentary System of Deep Series of Strata in Anpeng Block in Zhaowa Oilfield

Anpeng deep series of strata refer to exploratory targets that are mainly consisted of the lower of H3(the third interval of the Hetaoyuan Formation) with a buried depth over 2800m. The sedimentary mode is fan delta complex near mountains where two subfacies develops, including fan delta front and pre - fan delta. They are subdivided into 6 micro sedimentary facies including near - shore under water distributary channel, far - shore under water distributary channel, rnouth bar, sand sheet, interchannel mud and pre - fan delta mud. Near - shore and far - shore under water distributary channel micro facies are relatively widely distributed in the study area. This set of reservoirs is characterized by compacted and low permeability and the type of sandbody obviously control the physical properties of reservoirs. Reservoirs of medium to far - shore under water distributary channel micro facies have good physical properties, thus are the main oil layers in Anpeng deep series of strata.