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惠州凹陷古近系文昌组—恩平组是油气田勘探的重要接替层系。通过对其烃源岩条件、圈闭条件和构造活动的研究发现,惠州凹陷文昌组—恩平组在始新世—早渐新世和中中新世晚期至今形成了披覆背斜、逆牵引背斜、断背斜、断鼻、古潜山以及岩性等多种类型的圈闭;在49～18.5Ma文昌组—恩平组生成了大量油气,具备形成早期油气藏的条件;中中新世开始的东沙运动使得文昌组—恩平组早期形成的油气藏发生调整。根据油气成藏主控因素分析,将文昌组—恩平组的成藏模式分为早期成藏—晚期保存型、早期成藏—晚期调整型、早期成藏—晚期补充型和晚期成藏4种成藏模式。
The Wenchang Formation-Enping Formation of the Paleogene in Huizhou Sag is an important succession of oil and gas field exploration. Based on the study of source rock conditions, traps and tectonic activities, it is found that the Wenchang Formation-Enping Formation in Huizhou Depression formed a series of anticline and anticlinal anomalies during the Eocene-Early Oligocene and late Middle-Miocene so far Traction anticline, fault anticline, fault nose, burial hill and lithology. In the 49 ~ 18.5Ma Wenchang Formation-Enping Formation, a large amount of oil and gas were formed, which provided the conditions for the formation of early oil and gas reservoirs. The Dongsha movement, which started in the Pliocene, adjusted the early formation of the Wenchang Formation and Enping Formation. According to the main control factors of oil and gas accumulation, the hydrocarbon accumulation modes of Wenchang Formation and Enping Formation are divided into three types: early accumulation-late preservation, early accumulation-late adjustment, early accumulation-late supplement and late accumulation Species accumulation model.