基于节点网络模型的缝洞型碳酸盐岩油藏动态描述技术  

Dynamic description technology for fracture-vug carbonate reservoirs based on node network model

作　　者：郑松青 计秉玉[1] 顾浩 王秀坤 宋考平 Zheng Songqing;Ji Bingyu;Gu Hao;Wang Xiukun;Song Kaoping(Sinopec Petroleum Exploration and Production Research Institute,Beijing 100083,China;Unconventional Petroleum Research Institute,China University of Petroleum,Beijing 102249,China)

机构地区：[1]中国石油化工股份有限公司石油勘探开发研究院,北京100083 [2]中国石油大学(北京)非常规油气科学技术研究院,北京102249

出　　处：《石油学报》2024年第9期1422-1431,共10页Acta Petrolei Sinica

基　　金：中国石油化工股份有限公司科技部项目(P22212)资助。

摘　　要：缝洞型碳酸盐岩油藏非均质性极强,缝洞体离散分布,基于地球物理雕刻技术的静态描述存在较大不确定性。动态描述技术利用动态资料深化油藏认识,是动静结合提高油藏描述精度的重要途径。现有动态描述技术多基于连续介质理论构建,很难反映缝洞体离散分布的特征,与地球物理雕刻结果"兼容性"较差。针对缝洞体离散分布的特征,创建一种基于节点网络模型的动态描述技术。首先,提出基于节点网络的离散缝洞表征方法,建立节点网络模型自动生成方法,实现地球物理雕刻模型与节点网络模型快速转换;其次,基于节点网络模型,建立流动表征及开发指标计算方法,算例显示,产量、压力等开发指标计算结果吻合度超过93%,计算速度提升156倍;最后,形成缝洞关键特征参数反演方法,明确缝洞型油藏3个Ⅰ类、4个Ⅱ类共7个关键特征参数,基于拉丁超立方抽样建立辅助历史拟合方法,确定缝洞关键特征参数概率分布,算例显示,缝洞体储量、水体体积、断裂渗透率等反演误差约为10%,满足动态分析需求。该技术在塔河油田多个单元(井区)进行验证及应用,开发指标历史拟合符合率达90%以上,实现了缝洞体地质储量及动用程度的量化表征,提高了开发措施实施的针对性和有效性。The heterogeneity of fracture-vug carbonate reservoirs is extremely strong with discretely distributed fracture-vug bodies,and the static description based on geophysical description techniques is highly uncertain.Dynamic description techniques make use of dynamic data to deepen the understanding of reservoirs,which is an important way to improve the precision of reservoir description by combining dynamic and static techniques.Most of the existing dynamic description techniques are mainly established based on the continuum theory,which is difficult to reflect the discrete distribution characteristics of fracture-vug bodies,and have poor"compatibility"with geophysical carving results.A dynamic description technique based on node network model was created based on the discrete distribution characteristics of fracture-vug bodies.Firstly,a discrete fracture-vug characterization method based on node network is proposed,and an automatic generation method of node network model is also established,aiming to realize the rapid transformation between the geophysical carving model and the node network model;secondly,a flow characterization and development index calculation method is built based on the node network model.Calculation examples show that the goodness of fit for the calculation results of development indexes such as production and pressure is over 93%,and the calculation speed is increased by 156 times;finally,an inversion method for the key characteristic parameters of fracture and vug is established,and 7 key characteristic parameters for fracture-vug reservoirs,including 3 in ClassⅠand 4 in ClassⅡ,are defined.Based on Latin hypercube sampling,the paper establishes an auxiliary historical fitting method,determines the probability distribution of key characteristic parameters of fracture and vug,and develops software modules.Calculation examples show that the inversion errors for the reserve of fracture-vug bodies,volume of water bodies,and fracture permeability are all about 10%,which met the requirements o

关 键 词：节点网络模型 缝洞 动态描述 雕刻体 开发指标 特征参数 动态反演 塔河油田 

分 类 号：TE344[石油与天然气工程—油气田开发工程]