基于储层动用程度的块状砂体流动单元划分方法及应用研究:以哈萨克斯坦Akshabulak油田为例  

A new method for identification of flow units of sandstone reservoir based on reservoir performance and its application in the Akshabulak oilfield,Kazakhstan

作　　者：王进财[1] 范子菲[1] 赵伦[1] 陈烨菲[1] 张安刚[1] 张祥忠[1] 郭雪晶 李毅 WANG Jincai;FAN Zifei;ZHAO Lun;CHEN Yefei;ZHANG Angang;ZHANG Xiangzhong;GUO Xuejing;LI Yi(PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China)

机构地区：[1]中国石油勘探开发研究院,北京100083

出　　处：《地学前缘》2023年第4期88-99,共12页Earth Science Frontiers

基　　金：中国石油前瞻性基础性重大科技项目“高含水砂岩老油田稳油控水及提高采收率技术研究课题(2021DJ3201)”。

摘　　要：以南图尔盖盆地Akshabulak油田J-Ⅲ层块状砂体为例,利用油田投产初期生产工作制度相近井的产液剖面资料和单井日产油量划分出“好”“较好”“中等”“差”4类储层动用程度类型。以储层动用程度类型为判别函数,利用岩心分析资料选出与储层动用程度类型响应较好的7类地质参数。以7类地质参数为变量,以测井解释数据为基础,运用神经网络聚类技术将储层划分为“高”“较高”“中等”“低”4类不同级别的流动单元。统计结果表明,4类储层动用程度类型与4种级别流动单元的静态地质参数和动态开发指标界限具有较好的对应性。研究结果表明流动单元的组合样式决定了储层的垂向和平面动用程度:垂向上,流动单元发育种类越多,水体会优先流向高级别流动单元,这导致油藏垂向水驱动用程度不均匀;平面上,高级别流动单元较发育的区域,水体会优先波及,这导致油藏平面水驱前缘推进速度有明显差异。在此基础上提出垂向上高级别流动单元实施调剖堵水、平面上天然水驱协同人工注水开发的开发技术策略,实现了稳产高效开发。Taking an example of the massive sandstone of layer J-Ⅲ,Akshabulak oilfield,southern Turgay Basin,Kazakhstan,we propose a new method to identify flow units based on reservoir performance ratings.First,four performance ratings,“excellent”,“good”,“moderate”and“poor”,are assigned according to reservoir production profile and daily well output under similar working conditions.Then,taking the reservoir performance rating as the discriminant function,based on core analysis results,seven types of reservoir quality indicators are selected for clustering analysis.Finally,based on the quality indicator values and well-log interpretation data,the flow units are delineated into four types,“high-flow”,“relatively high-flow”,“moderate-flow”and“low-flow”,according to water flow levels,by neural network clustering.Statistical analysis results show that the reservoir-quality indicator values correlate positively with reservoir performance ratings,therefore it is reasonable to identify flow units according to performance ratings.Our study indicates that the development pattern of flow units determines the reservoir performance:when flow units of different types are developed,water tends to flow towards units with higher flow levels causing uneven flooding in the vertical direction;horizontally,areas with high-level flow units are flooded preferentially causing significant uneven advancements of waterflooding front.We propose,therefore,to control vertical waterflooding by water plugging at high-level flow units and allow planar natural waterflooding combined with water injection to achieve stable and high-efficiency reservoir development.

关 键 词：南图尔盖盆地 块状砂体 流动单元划分方法 储层动用程度类型 剩余油特征 

分 类 号：TE343[石油与天然气工程—油气田开发工程] P618.130.21[天文地球—矿床学]