高30断块沙二段储层岩石及物性特征研究

储层岩石及物性特征是影响油田开发的重要因素 .通过岩心物性分析、X -衍射分析、岩心流动实验、岩石薄片鉴定和铸体薄片孔隙结构鉴定、毛管压力曲线测定等手段 ,对高 3 0断块沙二段储层的岩石学特征、储层物性特征、储集空间特征、孔隙结构参数及孔喉分布特征以及储层非均质性特征进行了全面深入的研究 .研究结果表明 :该断块主要由河道沉积的细砂岩—极细砂岩组成 ,从平面分布看 ,构造中部物性较好 ,西南部次之 ,北东部较差 ,这与生产状况吻合 ;该区砂体的主要储集空间是次生孔隙 ,粒间溶孔是主要孔隙类型 ,约占总孔隙度的 70 %～ 80 %,其次是填隙物内溶孔 ,约占总孔隙度的 2 0 %～ 2 5 %,粒内溶孔及铸模孔所占比例较小 ,占总孔隙度的 1 %～ 5 %;孔隙结构类型为中孔—中喉型和中孔—细喉型 ,该区油藏渗透率低 ,宏观及微观非均质性严重 .根据类似油藏的开发经验 ,中低含水期只能采出可采储量的三分之一左右 ,高含水期将是该断块注水开发的一个重要阶段

Study on lithologic and physical properties of Sha 2 reservoir of Gao 30 block

The lithologic and the physical properties of reservoir are the important factors of influencing oilfield development. The lithologic property, the physical property, the storage and accumulation space, the pore structural parameters and pore throat distribution and the heterogeneity of the reservoir are studied based on core physical property analysis, core X-ray diffraction analysis, core flow experiments, rock thin-section identification, cast thin-section pore structure identification and capillary pressure curve measurement. The results show that, the reservoir sandbody mainly consists of fine-superfine sandstone of channel deposit; in horizontal plane, the physical property of the reservoir in the center of the structure is the best, in the southwest secondary, and in the northeast worse, this is identical with production situation; the main storage and accumulation space of the sandbody is secondary pore, intergranular dissolved pore makes up 70%～80% of total porosity, intracaulking-material dissolved pore makes up 20%～25% of total porosity, and intragranular dissolved pore and mould pore make up 1%～5% of total porosity; pore structure types are medium pore-medium throat type and medium pore-fine throat type. The reservoir is of low permeability and serious heterogeneity. According to the development experience of similar reservoirs, about one-third of recoverable reserves of the reservoir can be produced in low-medium water cut period, and the production in high water cut period will be important stage in the waterflooding development of the block.