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应用天然气分子碳同位素生成动力学技术,对LW3-1气田有效气源区和运移聚集史进行了系统研究,结果表明:该气田有效气源区为白云主洼东部斜坡带恩平组浅湖相—沼泽相沉积烃源层,现今埋深(从海底计算)范围介于4 600～6 000 m;该气田属于阶段性累积聚气,成藏时间较晚,有效充注期在8～0Ma,目前仍处于有效充注阶段。这一新认识对于珠江口盆地白云凹陷深水区天然气勘探具有重要的指导意义。
Based on the kinetic techniques of molecular carbon isotope formation in natural gas, the effective gas source area and migration and accumulation history in LW3-1 gas field have been systematically studied. The results show that the effective gas source area of this gas field is the shallow lake The sedimentary hydrocarbon source layer of facies-swamp facies now ranges from 4 600 m to 6 000 m (from seafloor). This gas field belongs to the stage of accumulative gas accumulation, and the reservoir forming time is later. The effective filling period is between 8Ma and 0Ma , Is still in an effective filling stage. This new understanding is of great significance to the exploration of natural gas in the deep-water area of the Baiyun Sag in the Pearl River Mouth Basin.