基于SSOM的流动单元划分方法及生产应用——以渤海湾盆地F油田古近系沙三中亚段湖底浊积水道为例  

Flow unit division based on SSOM and its production application:A case study of sublacustrine turbidity channels of middle Es3in F oilfield,Bohai Bay Basin

作　　者：王亚 刘宗宾 路研 王永平 刘超 WANG Ya;LIU Zongbin;LU Yan;WANG Yongping;LIU Chao(Tianjin Branch of CNOOC China Limited,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：《岩性油气藏》2024年第2期160-169,共10页Lithologic Reservoirs

基　　金：国家科技重大专项“低渗-致密油藏描述新方法与开发模式”(编号:2017ZX05009001)资助。

摘　　要：在储层构型级次划分的基础上,归纳总结了渤海湾盆地F油田古近系沙三中亚段湖底浊积水道各级渗流屏障与构型界面的关系,并采用监督模式下的自组织映射神经网络算法开展流动单元定量评价,明确了构型模式控制下的流动单元分布规律。研究结果表明:(1)渤海湾盆地F油田沙三中亚段储层可划分为Ⅰ、Ⅱ、Ⅲ、Ⅳ等4类流动单元。(2)基于SSOM算法的流动单元识别结果表现出较高的预测准确率,其中,256组训练样本的整体回判准确率为82.81%,110组测试样本的识别准确率为80.91%,能够满足地质油藏研究的需求。(3)垂向上,不同类型的单一水道内部发育的流动单元类型不同,造成流动单元垂向分布的差异性。Ⅰ类、Ⅱ类优质流动单元发育在浊积水道体系演化的中期,主要分布在二类单一水道;Ⅲ类、Ⅳ类流动单元发育在浊积水道体系演化的早期和晚期,其中,Ⅲ类流动单元分布广泛,在一类、二类、三类单一水道均有分布,Ⅳ类流动单元发育在一类、三类单一水道。侧向上,受水道体系不同沉积演化阶段的影响,流动单元的侧向分割方式不同。流动单元与非渗透层接触样式发育在浊积水道体系早期沉积旋回中,接触界面明显,属于一类水道沉积砂体;流动单元间的相互接触样式则发育在水道体系中晚期沉积旋回中,属于二类、三类水道沉积砂体。(4)平面上,受单一水道侧向迁移和垂向加积作用的影响,复合水道内部流动单元平面展布差异性明显。Ⅲ类流动单元在单砂体内部广泛发育,井间连续性好,在浊积主水道、浊积水道及水道漫溢沉积砂体处均有发育;渗流能力较好的Ⅰ类、Ⅱ类流动单元分布局限、连续性差,仅在浊积水道主流线方向及主水道砂体处有分布,呈不连续的点状或带状分布;Ⅳ类流动单元呈环带状分布在Ⅲ类流动单元的外缘,在浊积水道漫溢沉积砂体处发育Based on the classification of reservoir architecture,the relationship between seepage barriers and ar-chitecture interfaces of the sublacustrine turbidity channels of the middle third member of Paleogene Shahejie Formation(Es3)in F oilfield of Bohai Bay Basin was summarized,a supervised self-organizing map neural net-work algorithm was used to quantitatively evaluate flow units,and the distribution of flow units under the control of architecture models was clarified.The results show that:(1)The reservoirs of middle Es3 in F oilfield of Bohai Bay Basin can be divided into four types of flow units,namely typeⅠ,Ⅱ,ⅢandⅣ.(2)The flow unit recogni-tion results based on SSOM algorithm show high prediction accuracy,with an overall accuracy of 82.81%for 256 training samples and 80.91%for 110 testing samples,which can meet the needs of geological reservoir research.(3)Vertically,the flow units developed in different types of single channels may vary greatly,resulting in differ-ence of vertical distribution of flow units.The favorable typeⅠandⅡflow units are developed in the middle stage of turbidity channel system evolution,mainly distributed in the categoryⅡsingle channels.TypeⅢandⅣflow units are developed in the early and late stages of turbidity channel system evolution.Among them,typeⅢflow units are widely distributed in categoryⅠ,ⅡandⅢsingle channels,while typeⅣflow units are mainly developed in categoryⅠandⅢsingle channels.Laterally,influenced by the sedimentary evolution stages of chan-nels systems,the lateral division of flow units is different.The contact pattern between the flow units and the nonpermeable layers develops in the early sedimentary cycle of the turbidity channel system,with obvious contact in-terfaces,which belongs to categoryⅠchannel sand bodies.The contact pattern between the flow units develops in the middle and late sedimentary cycles of the channel system,which belongs to categoryⅡandⅢchannel sand bodies.(4)Horizontally,due to the lateral migration and vert

关 键 词：SSOM算法 浊积水道 储层构型 流动单元 自组织映射神经网络 监督模式 沙三中亚段 古近系 渤海湾盆地 

分 类 号：TE345[石油与天然气工程—油气田开发工程] P618.3[天文地球—矿床学]