缝洞型碳酸盐岩油藏井组连通性识别方法——以塔河油田托甫台区为例

Identification of well connectivity in fractured-vuggy carbonate reservoirs:A case study of Tuofutai area in the Tahe Oil Field

刘俊玲 王东寨 吴慧

Liu Junling Wang Dongzhai Wu Hui

中国石化西北油田分公司塔河采油三厂, 新疆轮台 841600

No.3 Oil Production Plant, SINOPEC Northwest Company, Luntai, Xingjiang 841600, China

塔河油田奥陶系发育大规模的缝洞型储层,其有效储集空间主要为相互连通的缝、洞单元,相互连通的多个缝、洞单元可构成缝-洞复合体。受缝、洞单元连通性空间分布差异性的控制,同一油层内往往存在多个相互独立的缝-洞复合体。为了明确缝-洞复合体之间的连通性,提出了综合利用动、静态资料确定缝-洞复合体连通性的方法:(1)同一缝-洞复合体具有高且连续的振幅变化率,不同的缝-洞复合体之间具有较低且易间断的振幅变化率;(2)同一缝-洞复合体中流体性质相似,反之存在一定的差异;(3)钻遇同一缝-洞复合体的井组具有相似的压力、产液变化趋势;(4)钻遇同一缝-洞复合体的井组具有相似的钻采措施响应特征。以丰富的动静态资料为依托,明确了塔河油田托甫台区W1井区缝-洞复合体及井组之间的连通关系,初步建立了缝洞型碳酸盐岩油藏井组连通性的划分标准。

The Ordovician reservoirs in the Tahe Oil Field consist of large-scale seams and holes and the effective reservoir space is mainly interconnected seam and hole units. Reservoir development practices show that under the control of the distribution difference of seam and hole units, multiple independent seam and hole complexes exist within the same reservoir. Connectivity between seam and hole complex is one of the decisive factors of reservoir development effect. In order to define the connectivity between different seam and hole complexes, the author puts forward several methods based on dynamic and static data:(1) The same seam and hole complex shows high and continuous rate of seismic amplitude change. On the contrary, different seam and hole complexes show lower and discontinuous rate of seismic amplitude change; (2) Fluid within the same seam and hole complex may be similar; (3) Wells in the same seam and hole complex often show similar pressure and fluid producing change tendency; (4) A well can correspond to the drilling and maintenance measures of other wells in the same complex. Based on abundant dynamic and static data, it has been clearly analyzed whether wells in the W1 well block are connected, and a division standard for well connectivity in fractured-vuggy carbonate reservoirs has been established.

https://doi.org/10.11781/sysydz2015S1077