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应用EBM盆地模拟系统对北部湾盆地涠西南凹陷的沉降史回剥分析表明:由裂陷期到坳陷期和裂后加速沉降期,沉降速率的变化呈“幕”式特点;构造沉降速率占总沉降速率的份额由下第三系裂陷期的3/5逐渐演变为上第三系的1/2,再到裂后加速沉降期的1/3;上述事实表明盆地产生沉降的主导原因在早期为构造活动、晚期演变为非构造因素为主。北部湾盆地涠西南凹陷岩石圈拉伸系数β值(1.85)对应于一个较强—强的生烃强度值,这为有效烃源岩的评价、油气勘探提供了可靠的地质依据。
The back-pecking analysis of the subsidence history of the Xuannan depression in the Beibu Gulf basin using the EBM basin modeling system shows that the sedimentation rate changes from “rift period” to " The share of velocity in the total sedimentation rate gradually evolved from 3/5 of the Paleozoic uplifting to 1/2 of the Upper Tertiary and to 1/3 of the accelerated subsidence after the cleavage; the above fact indicates that the sedimentation of the basin The dominant causes are tectonic activity in the early stage and late-stage non-structural factors. The lithospheric tensile coefficient β (1.85) corresponding to a strong-strong hydrocarbon generation intensity value in the southwestern depression of the Beibu Gulf basin in the southwestern depression of the Beibu Gulf basin provides a reliable geological basis for the evaluation of effective hydrocarbon source rocks.