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潮汕坳陷属南海东北部陆坡区的一个中生代大型残留盆地,油气勘探及研究程度甚低。根据近年来潮汕坳陷及陆上邻区粤东、粤中的油气地质调查和LF35-1-1井钻探成果,系统分析了中生界烃源岩地质地球化学特征。初步研究表明,潮汕坳陷中生界侏罗系海相暗色泥岩为该区主要烃源岩,其母质类型以Ⅲ型干酪根为主,成熟度偏高,分布范围较广且稳定,具有较好的生烃潜力,属差—好烃源岩;白垩系暗色泥岩为次要烃源岩,母质类型亦以Ⅲ型干酪根为主,成熟度亦偏高。据层序地层分析,下白垩统下部地层具有一定生烃潜力,属差—中等烃源岩。海陆中生代地层对比表明,潮汕坳陷生烃条件比陆上邻区粤东、粤中好,海域大范围发育和保存的与陆上下侏罗统桥源组等烃源岩相当的沉积岩系,其有机质生成和保存条件较好,具较大生烃潜力。
The Chaoshan Depression is a Mesozoic large residual basin in the slope region northeast of the South China Sea with a very low degree of hydrocarbon exploration and research. According to the geological survey of oil and gas in eastern Guangdong and Guangdong in the Chaoshan Depression and land adjacent areas in recent years and the drilling results in LF35-1-1 well, the geo-geochemical characteristics of Mesozoic source rocks are systematically analyzed. Preliminary studies have shown that Jurassic marine dark mudstones in the Mesozoic in the Chaoshan depression are the major source rocks in this area. Their parental types are mainly Type III kerogen, with high maturity, wide and stable distribution, Good hydrocarbon generation potential is poor-good source rock; Cretaceous dark mudstone is the secondary source rock, and the parent type is mainly Type III kerogen with high maturity. According to the sequence stratigraphy analysis, the Lower Cretaceous lower strata have some potential for hydrocarbon generation, which is a poor-medium source rock. The stratigraphic correlation between the strata in the stratigraphic and marine stratigraphic shows that the hydrocarbon generation conditions in Chaoshan Depression are larger than those in the adjacent areas of eastern Guangdong, middle Guangdong, And the preservation conditions are good, with a large hydrocarbon potential.