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中国近海分布着广泛的前新生代地层 ,特别是台湾海峡盆地至渤海海域 ,50 %探井的钻遇此套地层。前新生代地层在海域以沉积岩为主 ,厚度大 ,时代全 ,主要为华北地台与下扬子准地台为背景的新生代沉积基础层。通过地化分析、油岩对比 ,证明前新生代沉积岩有良好的生烃条件。经源岩对比 ,证明源岩对油气的成藏作出了贡献。井的测试结果与储层分析都证明前新生代地层有良好的储集性能。海域前新生代地层是下步油气勘探的新领域 ,有广阔的前景。预测存在有前生前储、新生前储及混合 3种类型油气藏
There are a wide range of pre-Cenozoic strata offshore China, especially from the Taiwan Strait Basin to the Bohai Sea, where 50% of exploration wells drilled this formation. The Pre-Cenozoic strata are dominated by sedimentary rocks in the sea area. They are thick in thickness and of the same age. They are mainly the Cenozoic sedimentary basement under the background of the North China Platform and the Lower Yangtze Platform. By geochemical analysis, oil-rock contrast, pro-Cenozoic sedimentary rocks have good hydrocarbon generation conditions. The comparison of source rocks shows that the source rocks contributed to the hydrocarbon accumulation. Well test results and reservoir analyzes have demonstrated that the Pre-Cenozoic strata have good reservoir properties. The pre-Cenozoic strata in the sea area is a new area for oil and gas exploration in the next step with broad prospects. It is predicted that there are three types of reservoirs: pre-antecedent reservoirs, pre-neogene reservoirs and mixed reservoirs