利用单井动态判识缝洞型碳酸盐岩油藏多缝洞体——以哈拉哈塘油田哈6井区为例

Using Well Production Performance to Identify Cave-Cleft Bodies in Fractured-Vuggy Carbonate Reservoirs:A Case Study of Ha-6 Well Block in Halahatang Oilfield

以塔里木盆地哈拉哈塘地区哈6井区为例,在研究区储集层分布特点和油水空间关系的研究基础上,分析生产井的开发特征,建立了单井上可以判识的3种基本的多缝洞体油水分布样式:隔油底(边)水连通式、隔水底(边)水连通式和复合裂缝连通式,并相应指出了其成因和生产特征。提出了多缝洞体单井判识的3种动态分析方法,即试采数据分析法、水驱特征曲线分析法和弹性产率分析法,并提出了不同多缝洞体适用的识别方法。结合缝洞体平面范围确定原则,识别出研究区3类多缝洞体。

Taking Ha?6well block as an example,based on the study of reservoir distribution and spatial relationship of oil and water in the study area,this paper analyzes the development features of producing wells,establishes3patterns of oil and water distribution in cave?cleft bodies which can be identified from single wells-separate oil and bottom/edge water connection pattern,separate water and bottom/edge water connection pattern and composite fracture connection pattern,and demonstrates the causes of the3patterns and the production characteristics.The paper also presents3performance analysis methods to identify cave?cleft bodies,i.e.production test data analysis method,waterflooding type curve analysis method and elastic productivity analysis method,and demonstrates the correspongding identification methods applicable for each cave?cleft body.Combined with the principle of planar distribution area determination for cave?cleft bodies,3types of cave?cleft bodies are identified in the study area.