缝洞型油藏井间示踪剂分类等效解释模型及其应用

Classified Equivalent Interpretation Model for Interwell Tracer in Fractured-Vuggy Reservoir and Its Application

针对目前孔隙型油藏井间示踪剂解释模型难以有效定量表征缝洞型油藏井间缝洞参数的问题,基于塔河缝洞型油藏井间缝洞组合结构与示踪剂曲线形态匹配关系,将井间缝洞组合结构等效为一系列的缝洞条带(流道),利用对流扩散理论及井间示踪基本思路,分别推导了缝洞型油藏单峰型、独立多峰型及连续多峰型井间示踪剂等效解释模型,并对塔河油田四区S65单元TK461井组示踪剂测试结果进行综合解释与可靠性分析。结果表明:所建解释模型及方法具有良好的适应性与可靠性,为该类油藏井间示踪剂的定量表征提供了一种新方法,同时也为考虑缝洞构型的井间示踪剂定量解释模型的建立提供了借鉴与理论基础。

It is difficult to quantitatively characterize the parameters of inter-well fracture and cavity in fractured-vuggy reservoir by the current interwell tracer interpretation model for pore reservoir.Based on the matching relationship between interwell fracture-cavity combination structure and tracer curve shape in Tahe fractured-vuggy reservoir,interwell fracture-cavity combination structure was equivalent to a series of fracture-cavity strips,and the equivalent interwell tracer interpretation models with single-peak,independent multiple peaks and continuous multiple peaks for fractured-vuggy reservoir were derived based on the convection-diffusion theory and the basic idea of interwell tracing.The tracer test results in TK461 well group of S65 unit in the fourth block of Tahe Oilfield are comprehensively interpreted with the established equivalent interwell tracer interpretation models and the reliability of the interpretation models is analyzed.It is shown that the established interpretation models and method have good adaptability and reliability,which provides a new method for quantitative characterization of interwell tracer in this kind of reservoir,and also provides reference and theoretical basis for the establishment of interwell tracer quantitative interpretation model considering fracture-cavity configuration.