【摘要】 安塞油田侯氏-杏河地区长6油藏属于低渗-特低渗油藏,针对导致该油藏注水开发过程中一系列问题的复杂多变的渗流特征,利用油水相渗实验与核磁共振实验,通过分析曲线特征与重要渗流参数分布将研究区油藏储层分为3类,并结合物性测试、恒速压汞、X衍射等实验结果,分析物性、孔喉结构、黏土矿物以及注水方式对渗流特征的影响。结果表明:3类油藏的渗流参数依次变差,渗流能力减弱;束缚水饱和度受黏土矿物含量的影响程度较大;驱油效率与渗透率和喉道半径呈正相关,与孔喉半径比呈负相关,且受微观均质程度以及注入压力以及注入水体积影响;可动流体饱和度随渗透率的增大而增大,主要受控于孔隙与喉道分布及二者的空间配置关系。从好到差的3类油藏对应的初期产量、稳产周期依次降低。储层因素通过影响渗流特征,进而对开发特征产生影响。更多还原

【Abstract】 The reservoir of Chang 6 in Houshi-Xinghe area of Ansai Oilfield belongs to low-permeability-ultra-low permeability reservoir. The characteristics of complex and variable seepage characteristics lead to a series of problems in the development of water injection. In this paper, oil and water phase seepage experiments and NMR experiments are used to analyze the characteristics of the curve and the distribution of important parameters to divide the reservoirs in the study area into three categories. Based on experiment results of physical property test, constant rate mercury injection, and X-ray diffraction, the effects of physical properties, pore-throat structure, and clay minerals on the seepage characteristics are analyzed. The results show that the seepage parameters of the three types of reservoirs deteriorate in turn and the seepage capacity decreases. The irreducible water saturation is affected more by the clay mineral content. Oil displacement efficiency is positively correlated with permeability and throat radius, and negative correlation with pore-throat ratio. Oil displacement efficiency is also affected by micro-homogeneity, injection pressure and volume of injected water. Movable fluid saturation increases with the increase of permeability. It is mainly controlled by the distribution of pores and throats and their spatial configuration. The initial production and stable production cycles of the three types of reservoirs from good to bad are successively reduced. Reservoir factors affect the development characteristics by affecting the seepage characteristics.更多还原