孤岛油田渤21断块砂岩油藏岩石物理相与剩余油分布规律研究

Petrophysical Facies of Sandstone Reservoir in Bo Block-21 in Gudao Oilfield and Its Remaining Oil Distribution

储层岩石物理相是沉积作用、成岩作用、后期构造作用和流体改造作用的综合反映 ,同一岩性相可对应于不同的岩石物理相 ,而同一种岩石物理相则具有相似的水力学特牲和相似的物性特征。根据流动层带指标、孔隙度、渗透率、泥质含量、粒度中值等参数 ,采用灰色系统理论 ,将孤岛油田渤 2 1断块砂岩储层定量划分为 5类岩石物理相。结合该地区的实际地质和生产状况 ,详细论述了各类岩石物理相的主要特征 ,分析了岩石物理相与剩余油分布之间的关系 ,指出岩石物理相Ⅱ。

Reservoir petrophysical facies is considered as the complex reflection of sedimentation, diagenesis, late construction and fluid reworking. The one rock facies should be corresponding to different petrophysical facies. However, the hydraulic and physical property is similar in one petrophysical facies unit. Based on the flow zone indication, porosity, permeability, shale content and mean value of the grain size, the Bo block 21 sandstone reservoir petrophysical facies was divided into 5 types in Gudao Oilfield by means of gray system theory. Finally, with geology and production in the area, discussed are the main characteristics of each of them and the relation between the petrophysical facies and the residual oil distribution. The petrophysical facies Ⅱ and Ⅲ are the rich distribution zones of the residual oil in the field.