Investigation on Characteristics of Granulometric Distribution of Sediments in Lowpermeability Sandstone Reservoir
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摘要: 利用MS2000激光粒度仪，对胜利油区砂岩油藏中112口井的3000多块样品进行测试分析。实验发现低渗透砂岩油藏与中高渗透油藏不同，其沉积物粒度分布主要存在三种方式，每种方式都有其特定的粒度分布特征，并且与一定的沉积作用相联系。研究表明，沉积岩粒度中值分布、泥质含量、分选性等是影响油藏岩石渗透能力的重要因素，正态分布和混合正态分布能较好地描述低渗透砂岩油藏中沉积物的粒度分布特征。Abstract: The granularities of more than 2000 samples from 82 wells in the lowpermeability sandstone reservoirs of Shengli oilfield were tested by the MS2000 laser granulometric analyzer. The experiment showed that the granulometric distributions of sediments in low permeability sandstone reservoir behave as three modes, and each mode has its own characteristics and is related with certain sedimentation process. It is also found that the median distribution of granularity, the shale content of lowpermeability reservoir rock and the classified degree are the three key factors, which influence its permeability, and normal distribution or mixed normal distribution, can preferably describe the granulometric distribution characteristics of sediments in lowpermeability sandstone reservoir.
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