胡尖山油田安212区延安组延10储层特征研究

Characteristics of Yan 10 Reservoir of An-212 Well Block in Hujianshan Oilfield

通过岩心观察、铸体薄片、扫描电镜等方法对延10油层组储层特征进行了详细研究。安212区延10储层为低孔、低渗储层,主要发育辫状河亚相沉积,辫状河道为储层骨架砂体;砂岩岩性为长石石英砂岩和岩屑石英砂岩,孔隙类型以残余粒间孔和长石溶孔为主;储层物性特征明显受控于沉积相和成岩作用,沉积作用决定了储层砂岩颗粒粒度、成分,溶蚀作用增加了面孔率改善了储层物性,压实作用则降低了储层孔隙度,胶结作用对储层物性影响较为复杂。

Based on the analysis of field core observation, casting lamella, SEM and various testing data, the results show that Yan 10 reservoir in An -212 well block belongs to low porosity and low permeability oil reservoir; brai- ded river subfacies is the main deposit and braided channel is the main facies belt forming reservoir; sandstones are dominated by the feldspar quartz sandstone and lithic feldspathic sandstone; the granular pore and secondary feld- spar -dissolution pore are the main pore types in this area. Meanwhile, the sedimentary facies and diagenesis dis- tinctly affected the developmental characteristics of the reservoir. Sedimentation controls the grain size and constitu- ents. However, the dissolution improved the reservoir＇s physical properties by increasing the surface porosity, while compaction reduced reservoir porosity and the cementation＇s effect is complicated.