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文昌A凹陷主要发育文昌组、恩平组两套烃源岩,文昌组的中深湖相腐泥型、浅湖相腐殖-腐泥混合型烃源岩;恩平组主要发育浅湖相腐殖-腐泥混合型、河沼相腐殖型源岩。受控于先存断裂的存在及应力场的变化,本区古近系主要发育两种类型的断裂体系:早期张性断裂体系和伸展-走滑断裂体系,其差异性对盆地内各凹陷油气成藏条件具有不同的影响和控制作用,断裂的形成和演化控制了储集体的分布,形成多种类型圈闭,为油气垂向运移提供了主要的运移通道。指出文昌A凹陷发育两种不同的油气运聚模式。
The Wenchang Formation and Enping Formation are mainly composed of two sets of source rocks in Wenchang A depression, middle-deep lacustrine facies saprolite type and shallow lacustrine humus-sapropelic mixed source rock in Wenchang Formation, Humic - sapropel mixed type, river marsh facies source rock. Being controlled by the existence of preexisting faults and the change of stress field, two types of fault systems are mainly developed in Paleogene: the early Zhang-Zhang fault system and extensional-strike-slip fault system, The hydrocarbon accumulation conditions have different influences and control functions. The formation and evolution of faults control the distribution of reservoirs and form various types of traps, providing the main migration channel for the vertical migration of oil and gas. It is pointed out that there are two different modes of hydrocarbon migration and accumulation in Wenchang A depression.