基于数字岩心的储层微观孔隙结构定量表征——以渤海蓬莱19-3油田为例  

Quantitative characterization of reservoir micro-pore structure based on digital core-a case study of Penglai 19-3 Oilfield in Bohai Sea

作　　者：陈铭阳 侯亚伟 王鹏飞 刘晓涵 王政 CHEN Mingyang;HOU Yawei;WANG Pengfei;LIU Xiaohan;WANG Zheng(Tianjin Company,CNOOC(China)Co.,Ltd.,Tianjin 300452,China)

机构地区：[1]中海石油(中国)有限公司天津分公司,天津300452

出　　处：《石油地质与工程》2024年第3期82-89,共8页Petroleum Geology and Engineering

基　　金：“十四五”重大科技专项“海上油田大幅度提高采收率关键技术”和海上“双高-双特高”水驱油田提高采收率油藏关键技术(KJGG2021-0501)。

摘　　要：深化储层微观孔隙结构认识对渤海油田的长久高效开发具有重要现实意义,针对渤海蓬莱19-3油田新近系馆陶组储层,在物性特征及孔隙类型认识的基础上,依托基于CT扫描的三维数字岩心分析技术,采用最大球法完成三维孔隙网络模型的处理分割和构建,通过提取网络模型的特征参数,实现岩石微观孔隙结构的可视化、定量化表征,进而利用数值模拟方法分析岩心不同驱替方向带来的渗流差异。结果表明:1)蓬莱19-3油田岩石成分成熟度处于中等,分选较差,成岩作用相对较弱,胶结类型主要包括接触式胶结和孔隙式胶结,整体表现为疏松砂岩特征;2)储层以中-高孔渗为主,孔喉半径较大但分选较差,储集空间以原生粒间孔为主,次生溶蚀孔为辅;3)微观孔喉特征参数决定了储层宏观物性,连通的大孔喉配比越高,对储层物性贡献越大;4)储层内流体驱替具有明显的方向性,优质储层更易受到驱替方向所带来的影响。The deep understanding of reservoir micro rock pore structure is important for the long-term and efficient development of Bohai Oilfield.For Neogene Guantao Formation reservoir of Penglai 19-3 Oilfield in Bohai Sea,based on the understanding the reservoir physical properties and pore types,with the 3D digital core analysis technology based on core CT scanning,the maximum sphere algorithm is used to complete the processing,segmentation and construction of the 3D pore network model.By extracting the characteristic parameters of the network model,the visual and quantitative characterization of the rock micro pore structure is realized,and then the numerical simulation method is used to analyze the seepage difference caused by different displacement directions of the core.The results show that:1)In the study area,the rock composition exhibits a moderate level of maturity,poor sorting,and relatively weak diagenetic processes.The predominant types of cementation include contact cementation and pore-filling cementation,indicating the overall characteristics of loosely packed sandstone;2)the reservoirs are mainly medium-high porosity and permeability,with large pore throat radius but poor pore throat sorting;the reservoir space is dominated by primary intergranular pores,supplemented by secondary dissolution pores;3)The micro pore throat characteristic parameters determine the macro physical properties of the reservoir.The higher the ratio of connected large pore throats,the greater the contribution to the physical properties of the reservoir;4)Using the numerical simulation results,fluid displacement in the reservoir has obvious direction,and high-quality reservoirs are more susceptible to the influence of displacement direction.

关 键 词：蓬莱19-3油田 馆陶组 数字岩心 孔隙结构 驱替方向 

分 类 号：TE112.23[石油与天然气工程—油气勘探]