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近年来中国海相碳酸盐岩油气勘探发现了一批大型油气田,尤其在深层获得数个重大新发现,展示了良好的发现前景.塔中地区是塔里木盆地的一级构造单元,那里的奥陶系良里塔格组灰岩礁滩体蕴藏着丰富的天然气资源,储层为陆棚边缘礁滩体,以低孔-特低孔、低渗为特征,非均质性强,目前埋深在4500～6500m.研究发现,良里塔格组深部储层的形成和分布除受早期高能沉积相带、溶蚀作用等控制外,喜山期以来发生的天然气强充注过程形成裂缝网络,对优化和改善储集层性能具有重要作用.重点探讨了天然气晚期强充注与深层奥陶系碳酸盐岩储集性能改善的关系,建立了相应的机制与模式,有利于对勘探靶区的预测评价.
In recent years, a large number of large-scale oil and gas fields have been discovered in marine carbonate rock oil and gas exploration in China, and several major new discoveries have been made in depth, demonstrating a good prospect of discovery. The Tazhong area is a tectonic unit in the Tarim Basin where the Austrian The limestone reefs in the Tao-Li-Liangtag Formation contain abundant natural gas resources. The reservoir is a marginal edge reef body, characterized by low porosity-low porosity and low permeability, high heterogeneity and current depth At 4500 ~ 6500m. The study found that the formation and distribution of deep reservoirs in the Lianglitage Formation were controlled by early high-energy sedimentary facies and dissolution, and the fracture network formed during the strong charge of natural gas during the Himalayan period. Optimize and improve the performance of reservoir plays an important role.It focuses on the relationship between the late strong charge of natural gas and the improvement of reservoir performance of deep Ordovician carbonate rocks and establishes the corresponding mechanism and mode, Predictive evaluation.