鄂尔多斯盆地安塞地区延8段储层特征

Reservoir Characteristics of Yan 8 Member in Ansai Area of Ordos Basin

针对安塞地区南部延8段油藏的发现,依据测井数据及钻井岩心样品,分析延8段储集砂层储层特征及其主控因素。研究表明,研究区延8段储集砂岩多为中—细粒岩屑长石砂岩;粒间孔、长石溶孔等次生孔隙发育,多为大孔-粗喉型或中孔-中喉型孔隙结构;压实作用导致延8段储集砂岩致密,溶蚀作用是发育有利油藏富集的中孔、中—高渗带的主要原因。

In view of the discovery of new reservoirs in the Yan 8 member oil layer group in the southern part of the Ansai area,based on drilling data and core samples,the reservoir characteristics and its main control factors on compaction of Yan 8 member reservoirs were analyzed.The results indicate that the main rock type in the Yan 8 member storage sand collection layer in the study area is mostly medium-fine grained feldspar sandstone.Secondary pore development such as intergranular pores and feldspar dissolved pores;the pore structure is dominated by large pore thick larynx and middle pore middle larynx;The main controlled diagenesis of the reservoir is compaction,and dissolution is the main factor for the existence of medium pore and high permeability zone conducive to reservoir enrichment.