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通过对莺歌海盆地和琼东南盆地天然气、凝析油的地球化学特征分析 ,认为莺歌海盆地底辟带天然气主气源为上第三系梅山组、三亚组海相泥岩 ,YC1 3-1气田天然气主气源为下第三系陵水组、崖城组滨海沼泽及浅海相源岩。有机包裹体、成岩作用和天然气分布等研究结果表明 ,莺歌海盆地底辟带天然气为多期幕式充注 ,最晚一期为富含 CO2 天然气的充注 ;YC1 3-1气田天然气总体上为连续充注。
Based on the geochemical characteristics of natural gas and condensate in Yinggehai Basin and Qiongdongnan Basin, it is concluded that the main gas source of the natural gas in the diapir belt of Yinggehai Basin is the marine mudstone of the Meishan Formation and Sanya Formation of the Upper Tertiary, YC1 3-1 The main natural gas source for the gas field is the Lower Third Member of the Lingshui Formation and the Yacheng Formation coastal marsh and shallow sea facies source rocks. The results of organic inclusions, diagenesis and distribution of natural gas indicate that the natural gas in the diapir belts of Yinggehai Basin was charged in multi-stage and the most advanced phase was filled with CO2-rich natural gas. The natural gas of YC1-1-1 gas field as a whole For continuous filling.