松辽盆地北部致密火山岩孔隙分形结构特征及储层综合评价  

Pore fractal structure characteristics and reservoir comprehensive evaluation of tight volcanic rocks in northern Songliao Basin

作　　者：于春勇 屈凯旋 郭青松 张雨欣 沈文洁 邵慧 YU Chunyong;QU Kaixuan;GUO Qingsong;ZHANG Yuxin;SHEN Wenjie;SHAO Hui(No.1 Mud Logging Company,BHDC,CNPC,Tianjin 300280,China;Oil&Gas Cooperation and Development Company,BHDC,CNPC,Tianjin 300280,China)

机构地区：[1]中国石油渤海钻探第一录井公司 [2]中国石油渤海钻探油气合作开发分公司

出　　处：《录井工程》2024年第3期113-120,共8页Mud Logging Engineering

基　　金：中国石油渤海钻探工程公司重大工艺项目“破碎地层安全钻井技术研究”子课题“破碎带地层压力动静态模型表征及预监测系统研究”(编号:2024ZD13Y-01)。

摘　　要：为了明确火山岩优质储层分布,基于显微镜下薄片、扫描电镜、高压压汞、核磁共振等地质资料,分析了松辽盆地北部营三段致密火山岩储层孔隙分形特征及其与物性关系,并通过分形维数Q型聚类方法对营三段火山岩储层进行了分类评价。研究结果表明:营三段火山岩储层孔隙具分形特征,核磁共振能反映更多微小孔隙,核磁共振反映的分形维数D2整体上略大于高压压汞的分形维数D1;分形维数与储层物性及孔隙结构参数呈显著的正相关关系,且不同岩性岩相储层分形维数存在一定差异。通过分形维数Q型聚类和孔隙结构特征将致密火山岩储层分为4种类型:Ⅰ类储层孔缝组合以“原生气孔+溶蚀孔隙+构造裂缝”为主,分形维数主要分布在2.06~2.34之间,排驱压力平均值为4.79 MPa,平均孔喉半径与相对分选系数分别为2.40μm、34.37,储集性能较好;Ⅱ类储层孔缝组合以“杏仁体孔+构造裂缝”为主,分形维数分布在2.24~2.62之间,排驱压力平均值为9.64 MPa,平均孔喉半径与相对分选系数分别为0.69μm、46.64,储集性能良好;Ⅲ类储层孔缝组合以“微孔+微裂缝”为主,分形维数分布在2.43~2.86之间,排驱压力平均值为9.98 MPa,平均孔喉半径与相对分选系数分别为0.25μm、63.78,储集性能相对较差;Ⅳ类储层孔缝组合以“火山碎屑间基质内微孔+脱玻化微孔”为主,分形维数普遍>2.8,排驱压力平均值为13.99 MPa,平均孔喉半径与相对分选系数分别为0.09μm、70.47,基本无储集性能。整体而言,研究区以Ⅱ、Ⅲ类储层为主,且不同类型储层孔隙类型及孔隙结构差异显著。The distribution of high-quality reservoirs of tight volcanic rocks in northern Songliao Basin is not clear.Based on the geological data such as thin section under microscope,scanning electron microscope,high pressure mercury injection and NMR,this paper clarifies the fractal characteristics of volcanic reservoirs and their relationship with physical properties,and also classifies and evaluates the volcanic reservoirs of the third member of the Yingcheng Formation by fractal dimension Q-type clustering method.The results show that the pores of the volcanic reservoir of the third member of the Yingcheng Formation have fractal characteristics,more tiny pores can be reflected by NMR,and the fractal dimension D2 reflected by NMR is slightly larger than the fractal dimension D1 of high pressure mercury injection as a whole.There is a significant positive correlation between fractal dimension and reservoir physical properties and pore structure parameters,and there are some differences in fractal dimension of reservoirs with different lithology and lithofacies.According to fractal dimension Q-type clustering and pore structure characteristics,the tight volcanic rock reservoirs are divided into four types,among which the pore-fracture combination of typeⅠreservoir is mainly"primary pores+dissolved pores+structural fractures",the fractal dimension is mainly distributed between 2.06 and 2.34,the average displacement pressure is 4.79 MPa,the average pore throat radius and relative sorting coefficient are 2.40μm and 34.37,and the reservoir performance is good.TypeⅡreservoir is mainly"amygdaloid pores+structural fractures".The fractal dimension is 2.24-2.62,the average displacement pressure is 9.64 MPa,the average pore throat radius and relative sorting coefficient are 0.69μm and 46.64,and the reservoir performance is good.The pore-fracture combination of typeⅢreservoir is mainly"micro-pore+micro-fracture",the fractal dimension ranges from 2.43 to 2.86,the average displacement pressure is 9.98 MPa,the average pore th

关 键 词：火山岩 孔隙 分形维数 综合评价 松辽盆地 营三段 

分 类 号：TE132.1[石油与天然气工程—油气勘探]