碳酸盐岩油藏缝洞单元离散数值模型及压力响应曲线特征

 缝洞型碳酸盐岩油藏储集体类型多样，如何充分利用试井测试资料认识钻遇储层特征是后期挖潜增产的关键，并且常规解析试井模型中无法考虑井与缝洞的位置关系导致解释结果误差较大。为此，根据缝洞单元内缝洞与井的分布特征，分别建立了井钻遇和未钻遇缝洞2种离散数值试井模型，并进行有限元求解，分析了缝洞体大小以及缝洞体与井之间距离对井底压力响应曲线的影响。采用该方法对塔里木哈拉哈塘油田14口井测试资料进行试井分析，结果表明，受缝洞体的影响，井底压力响应曲线特征可分为：缝洞发育-未钻遇缝洞-井在缝洞附近、缝洞发育-钻遇缝洞、钻遇多个连通的缝洞、基质为主-缝洞不发育以及缝洞不发育-钻遇个别缝洞5种类型。

The discrete numerical model and transient pressure curves of fractured-vuggy units in carbonate reservoir

Fractured-vuggy carbonate reservoirs have various types of units, and it is important making a full use of the well test data for revealing the reservoir characteristics and enhancing the oil production. In the conventional analytical well test model, the positional relationship of the well and the fractured-vuggy units can not be properly considered. According to the distribution of the well and the fractured-vuggy units, two kinds of discrete numerical models are proposed, and solved by the finite element method. The influence of the cave volume and the distance between the cave center and the well is analyzed. The measured data of 14 wells in Hala Hatang Oilfield are classified and summarized, and the classification of the reservoir units and the identification methods are analyzed. The well test double logarithmic curves are divided into five types corresponding to different reservoir characteristics:the cave development, no drilling cave, the well near the cave; the cave development, the drilling cave; a number of connected caves of the reservoir; matrix dominant, fracture is not developed; caves are not developed, drilling individual caves.