长岭凹陷深层成藏主控因素及勘探方向分析

Major Control Factors of Deep Reservoirs in Changling Depression and Its Direction of Exploration

长岭凹陷深层勘探程度低、勘探潜力大,其油气成藏受多种因素制约,对其成藏主控因素的分析是下部勘探突破的关键。通过对以往勘探成果的分析认为基底断裂的主控作用明显,不仅控制了二级构造带和大型隆起、背斜构造的形成和分布,同时控制了该地区两大类油气藏即断层-岩性油气藏和火山岩油气藏的形成和分布;火山岩储层是深层的主要储层,是深层油气聚集的主要场所;深层成岩作用使砂岩储层和火山岩储层的储集性能分异明显,降低了砂岩储层的孔渗性,却保持了火山岩储集体的储集性能。

In Changling Depression, degree of exploration is low and potential of exploration is high in deep reservoirs, where hydrocarbon reservoir formation is controlled by many factors, analysis on its major control factors is the key for exploration breakthrough. By analyzing the exploration result in the past, it was considered that the major control of fundamental fracture was obvious, by which not only the secondary structural belt and large uplift, anticline structural formation and distribution are controlled, also 2 types of reservoirs, that is the formation and distribution of fault-lithologic oil and gas reservoir and volcanic reservoir. The volcanic reservoir is the main deep reservoir, is the major position of deep reservoir formation, the reservoir properties of sandstone reservoir and volcanic reservoir induced by deep diagenesis are different from each other, by which porosity in the sandstone reservoir is reduced, while the reservoir property is maintained in the volcanic reservoir.