塔河油田三叠系油藏特征分析

Study of the characteristics of the Triassic reservoir in Tahe Oilfield

中国石化西北分公司工程技术研究院,新疆乌鲁木齐 830011

Engineering and Technological Academy, SINOPEC Northwest Petroleum Exploration and Production Company, Urumqi 830011, China

地层压力、温度、流体性质等储层信息是评价油气储层的重要参数,模块式地层测试器(MDT)能在钻井裸眼条件下的不同深度段测出这些信息。分析了塔河油田三叠系T-Ⅱ和T-Ⅲ油组的油层、气层、水层的测井响应特征,结合实例给出了划分气水界面、油水界面的方法,并用MDT测试资料进行了验证,给出了T-Ⅱ和T-Ⅲ油组的气水层及油水层的压力梯度关系式。将测井技术与地层测试技术互相验证的方法应用于塔河油田探明储量的计算中,得到了较好的效果,提供了准确的油水和气水界面,确定了T-Ⅱ和T-Ⅲ油组的油藏性质。

Formation pressure, temperature and fluid property are important parameters in formation evaluation. MDT formation tester can collect such kinds of information at different depth intervals in an open hole. The logging responses of oil-, water- and gas-bearing layers of T-Ⅱ and T-Ⅲ Triassic oil-bearing groups in Tahe Oilfield were studied. How to distinguish gas-water contact (GWC) from oil-water contact (OWC) is demonstrated by real examples and verified by MDT testing data. Formulae of formation pressure gradient for both oil-water layer and gas-water layer were presented. The combination of log data and MDT testing data provides accurate OWC and GWC and reasonable interpretation of the oil-bearing groups T-Ⅱ and T-Ⅲ.