基于层序地层格架的南阳凹陷油气成藏模式

1. 中海油研究总院，北京东城100027

2. 中国地质大学资源学院，湖北武汉430074

3.“构造与油气资源”教育部重点实验室_ 中国地质大学（武汉），湖北武汉430074

4. 中国石化河南油田研究院，河南南阳473132

1. Research Institute, CNOOC, Dongcheng, Beijing 100027, China;

2. The Faculty of Resources, Wuhan, Hubei 430074, China

3. Key Laboratory of Tectonics and Petroleum Resources, MOE, China University of Geosciences, Wuhan, Hubei 430074, China

4. Henan Oilfield Company, SINOPEC, Nanyang, Henan 473132, China

南阳凹陷层序地层研究表明，油气藏与层序地层体系域关系密切。南部陡坡带容易形成的油藏类型主要有低位和高位砂体形成的砂体上倾尖灭油藏，水下扇砂体形成的砂岩透镜体油藏，湖侵域砂体超覆油藏；深凹区发育处于弯折带之下的低位和高位域的砂岩透镜体油藏；北部弯折带发育低位时期的砂岩透镜体油藏，断层–岩性油气藏及断背油气藏，高位体系域时期的断鼻、断层–岩性油气藏等，湖侵体系域中还可能存在地层超覆油气藏。结合南阳凹陷层序地层特点和各种类型油气藏分布规律，总结了南阳凹陷基于层序地层格架的油

Studies on the sequence stratigraphy of Nanyang Sag shows that the oil and gas accumulation is closely related to the system tracts. There are updip pinch out reservoir in the lower and high system tracts, lens reservoir formed in the subaqueous fan sandbodies, overlay reservoir formed in the sandbodies in the lake expanding system tracts of south steep slope. And there is lens reservoirs in the lower and high system tracts of the deep depression. There are lens, fault-litholigic, fault- anticline reservoirs in LST, fault noses and fault-litholigic reservoirs in HST, overlay reservoir formed in the sandbodies in the lake expanding system tracts of the north of gentle slope break.Combination of the characteristics of the sequence stratigraphy with distribution rules of all kinds of reservoirs lead to the conclusion that the oil and gas accumulation models are based on the sequence stratigraphic frames. The oil and gas accumulation regions are divided into three types: lower system tracts oil and gas accumulation region which are in the north gentle slope break, southern sandstones gas and oil accumulation region, axial deltal oil and gas accumulation region. Medium-short distance migration, medium-short fault and microfissure translocating system and centripetal & vertical migration are the oil and gas accumulation characteristics of north gentle slope break. The sandbodies of the southern sag are connected in the vertical direction and continuous in the horizontal direction. The sealing condition is not very well. Fault-block, fault-lens reservoirs are included to the deltal accumulation belt.