吉木萨尔凹陷致密油储层孔隙结构特征研究

The Research of Pore Throat Characteristics of Tight Reservoir in Jimusar Sag

采用高压压汞实验对新疆油田吉木萨尔凹陷致密油孔隙结构进行研究,并基于该实验数据,运用K-均值聚类分析法对孔隙结构进行分类。结果表明:储层高压压汞毛管压力曲线呈平台型,孔隙结构属高排驱压力-微纳孔喉结构,储集能力较好而渗流能力较差。孔喉分布复杂,多呈单峰或双峰分布,半径为0.005~9.19μm;Ⅰ类孔喉为0.02~0.57μm,Ⅱ类孔喉为0.01~0.04μm,Ⅲ类孔喉为0.005~0.02μm。利用SPSS软件计算研究区储层不同结构孔隙类型参数分布特征发现:具Ⅰ类孔隙结构特征的储层为致密油优势储层。

The pore structure of tight reservoir in Jimusar sag of Xinjiang oilfield were analyzed using high pressure mercury injection experiment.Based on the experiment data of research area,the pore structure wre classified by the kmeans clustering analysis method.The findings were as follows:high pressure mercury injection capillary pressure curve type with a platform,belonged to high expulsion pressure-micro pore structure,good adsorption capacity and poor seepage ability. Pore throat size distribution were complex,which showed unimodal or bimodal distribution.The sizes of the pore radius were in a range of 0.005~9.19 μm;TypeⅠin a range of 0.02~0.57 μm,typeⅡin a range of 0.01~0.04 μm,typeⅢ in a range of 0.005~0.02 μm.Based on the SPSS software,the parameters of different type of pore structure distribution were calculated.TypeⅠpore structure is in more favorable tight reservoir.