塔河油田四区奥陶系储层裂缝特征及其意义
The Characters of Fractures and Its Significance of the Reservoir in Ordovician in the Forth Block of Tahe Oil Field
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摘要: 塔河油田四区奥陶系以缝洞型油藏为主,裂缝是该区主要的油气疏导体系和储集空间。通过对20余口井的岩心、薄片观察,结合成像测井等各种分析化验资料,研究了裂缝的倾角、走向、长度、充填等特征参数,在此基础上,将裂缝划分为4个期次;采用岩心与露头相对比的方法研究了裂缝特征对岩溶的影响作用以及裂缝对储集性能的影响。Abstract: The fractured-vuggy petroleum reservoir is the dominant Ordovician reservoir in Block 4 of Tahe Oilfield. The fracture is the major petroleum migaration system and accumulating space. Through an observation on the core and thin section of more than 20 wells, combined with image logging and other analysis and test data, this paper studied some characteristic parameters of reservoir fracture, such as dip angle trend, length, and backfilling feature. On this basis, the formation of fracture is divide into four periods. The approach of core and outcroup comparison is adopted to study the effect of fracure features to karst and the effect of fracture to reservoir properties.
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Key words:
- Tahe /
- Ordovician reservoir /
- fracture feature
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