缝洞型碳酸盐岩油藏缝洞单元划分方法研究—以塔河油田奥陶系油藏主力开发区为例

以古岩溶缝洞系统发育为起因的缝洞储集体是缝洞型油藏油气储集的基本地质单元。缝洞型油藏的开发强调缝洞储集体内部和不同缝洞储集体之间的连通性,即缝洞单元是缝洞型油藏开发的基本单元。国内外文献对缝洞储集体和缝洞单元缺乏明确的定义,对缝洞单元的划分也在不断的探索中。以塔河油田奥陶系缝洞型油藏为背景,提出了缝洞单元的基本概念与基本分布模式,建立了缝洞单元的划分原则与划分方法。在研究塔河油田的缝洞储集体分布、流体性质分布、油井产能分布与井间连通性的基础上,对塔河油田奥陶系油藏主体开发区初步划分出15个缝洞单元,为塔河油田的进一步调整与治理提供了参考。

Research on the fracture-vug unit division of fractured-vuggy carbonate rock oil pools——an example from the Ordovician oil pools in the principle producing area of Tahe oilfield

Fractured-vuggy reservoirs originated from the development of paleo-karst fractured-vuggy system are the basic geological units for hydrocarbon accumulations of fractured-vuggy type. Importance should be attached to the connectivity within a fractured-vuggy reservoir and that among different fractured-vuggy reservoirs during the development of this kind of reservoirs, i. e. fractured-vuggy units are the basic development units of fractured- vuggy pools. However, both domestic and overseas literatures failed to offer a clear definition for fractured-vuggy reservoir and fractured-vuggy unit and the research on fractured-vuggy unit division still needs to be carried on. Taking the Ordovician fractured-vuggy pool in Tahe oilfield as an example, this paper presents basic concept and distribution mode for fractured-vuggy units and proposes principles and methods for their division. After the study on fractured-vuggy reservoir distribution, fluid properties and well productivity and inter-well connectivity in Tahe oilfield,the paper defines fifteen fracture-vug units in the principle producing area of the field, providing useful references for further development adjustment and management of the field.