塔河油田缝洞型碳酸盐岩油藏溶洞充填特征

Features of cavern filling in fractured/vuggy carbonate oil reservoirs,Take oilfield

溶洞储集体是塔河油田碳酸盐岩油藏最主要的储集体类型,大多数高产井都属于溶洞型储集体,但溶洞充填严重。实践表明,溶洞充填物的类型及充填程度,直接影响储层的物性特征及油井的产能。利用多学科资料,揭示了机械沉积充填、垮塌角砾岩充填和化学充填3种主要溶洞充填物类型,阐述了不同类型充填物的特征及充填模式;基于测井响应特征,建立了溶洞储集体不同充填物类型、充填程度的测井识别方法;针对不同的溶洞充填物类型,建立了相应的属性参数解释模型,定量表征了缝洞体内部充填特征,为油田开发奠定了地质基础。

Cavernous reservoir is the must primary type of carbonate oil reservoits in the Tahe oilfield and most of high yield wells ore associated with this type of reservoir,however,with caverns filled and packed seriously.It is proven from practice that the type of substance filling and filling degree in caverns affect directly on reservoir physical properties and well productivity,Prom multi-disciplinary information,it is revealed that mechanically sedimentary filling,caved breccia filling and chemical filling are three primary types of substance filling in caverns,and the features and filling modes of various filling substances are described.On the basis of logging response features,logging methods are established for identification of various types of filling substance and filling degree in cavernous reservoim.Also,for various types of filling substance,modeling is performed for interpretation of appropriate attribute parameters and the internal filling in fraeture/cavern system is characterized quantitatively,providing geologic basis for oilfield development.