碳酸盐岩岩溶缝洞型油气藏勘探开发关键技术——以塔河油田为例

The key Technologies for Exploration and Development of fractured/caverned Karst Reservoirs:A Case of Tahe Oil Field,Tarim Basin

碳酸盐岩岩溶缝洞型油气藏是受构造—岩溶旋回作用控制、由多个缝洞单元在空间上叠合形成的复合油气藏,勘探开发难度比较大。塔河油田是我国第一个以奥陶系碳酸盐岩岩溶缝洞型油气藏为主的古生界海相大油气田,勘探开发有其特殊性和复杂性。目前已初步形成了一套勘探与开发的思想和方法体系,具体介绍了已经形成的七个主要技术系列,包括碳酸盐岩岩溶缝洞型油藏评价技术、超深碳酸盐岩储层预测技术等。应用这些技术系列,在塔河油田取得了良好效果,提高了油藏采收率及开发井的建产率,增加了油气藏的可采储量。

Abstract： Carbonate fractured/caverned karst reservoirs are a kind of composite ones that are superimposed by many fracture/ cavern units within the control of cyclical tectonics and karstification so this kind of reservoirs are more difficuh exploration and development than other kind of ones. Tahe Oil Fieht in Tarim Basin is the first-discovered large Puleozoic field in China, in which Ordovician limestone reservoirs develop ＇abundant fractures and caverns so that the exploration and development of them have some particularity and complexity. For this, seven series of technology for exploration and development have been set up, which include： a） the evaluation technology for fraetured/caverned carbonate reservoir, b） the prediction technology for uhrodeep carbonate reservoir, c） the fine description technology for fractured/caverned carbonate reservoir, d） the optimized development plan technology for fractured/caverned carbonate reservoir, e） the optimized well-location deployment technology for fractured/caverned carbonate reservoir, 0 the dynamic management technology for fracture/cavern-predominated reservoir, g） general management technology for stabilizing production in aged carbonate reservoir blocks.Application of these series of technology in Tahe Fiehl has revealed good effects of development, which results in improving oil recovery efficiency and decreasing success rate of development wells.