川中安岳地区须家河组储层特征研究

The Reservoir Characteristics of the Xujiahe Formation, in Anyue Area, Central Sichuan

摘要: 在综合前人研究成果的基础上，结合钻井地质、铸体薄片鉴定、分析化验及相关测试资料，对安岳地区须家河组储集砂岩岩石学特征进行了简要分析。结果表明，储层砂岩主要是岩屑长石砂岩及长石岩屑砂岩为主，其次有长石石英砂岩及岩屑石英砂岩。储集空间主要发育粒间孔、粒内溶孔、铸模孔、晶间微孔、粒缘缝和破裂缝。砂岩储层属于低孔低渗和特低孔特低渗储层。储层排驱压力高、饱和中值压力高，属于细孔微喉型储层。

Abstract: On the basis of synthesizing the previous research results, the reservoir characteristics of reser-voir sandstone rocks of the Xujia river Formation in Anyue area were analyzed by the combination of drilling geology, cast thin sections, laboratory analysis and related test data. The results show that the reservoir sandstones are mainly lithic feldspar sandstone and feldspathic lithic sandstone, followed by feldspar quartz sandstone and lithic quartz sandstone. The reservoir space mainly includes intergranular pore, intragranular dissolved pore, pore of casting mould, intercrystalline micropore, grain edge joint and fracture. The sandstone reservoirs belong to the low porosity, low permeability and extremely low porosity and low permeability reservoirs. The reservoir displacement pressure is high and the saturation median pressure is high, which belongs to pore micro throat reservoir.