【摘要】 本文重点阐述南阳凹陷及其周缘中生代以来特别是新生代时期断裂对凹陷形成和发育所起的主导作用;对断裂活动期次作了较详细的划分,探讨了各期不同的活动方式;并结合沉积厚度、岩相分析等方法,论述了新生代凹陷的演化阶段及其找油前景。更多还原

【Abstract】 Nanyang Depression is a subbepression of Nan-iang (abr. of Nanyang-Xiangfan)Basin in the southwest of Henan province. The thickness of its Eogene sediments is greater than 4000 metres in 3600 square kilometres area. The search work for oil and gas was begun in the early part of seventies and three oilfields have been found in this area.Nanyang Depression occurred on the basement of the Paleozoic, Qinling rift system. The struotural framework of this depression was mainly controlled by two fault groups with NW and NE trending respectively, Their activities can be divided into three periods based on the evidence gained from the outcrop observation and seismic reflection sections in the depression.After making some synthetic analyses on three syngenetic faults and on the sedimentation condition, it is believed that the evolution history of Nanyang depression had undergone two development periods, the faultiag period (Late Cretaceous Epoch Eogene Period) and the depression period (Neogene Period-Quaternary Period). The fault-sag peribd may be subdivided into three’ stages, quick subsidence, stable subsidence and slow uplift.The uplift zone between two deposits centres is the most potential oilearing area for the depressive unit in the south depression.更多还原