【摘要】 大南洼陷在构造上属于伊通盆地的二级构造单元,是新生代的断陷盆地,主要圈闭类型有构造圈闭、地层圈闭和岩性圈闭。研究区储层薄、横向变化快,特殊岩性地质体多集中于边界断层附近,反射特征较为复杂。首先以层序地层学理论、断陷盆地沉积模式为指导,通过对全区各井多种岩性的波阻抗进行统计与比较,主要利用地震反演和相面法识别与解释特殊岩性地质体;再在等时地层格架基础上对大南洼陷整体开展储层、油气成藏及油气分布规律研究,确立有利区带,优选钻探目标,提供钻探靶位。更多还原

【Abstract】 The structure of Danan Sag belonged to a secondary tectonic unit of Yitong Basin,it was a Cenozoic fault basin.The main trap types were structural traps,stratigraphic traps and lithologic traps.In the study area,reservoirs were thin and they changed drastically in lateral direction.The geological bodies with special lithology were mainly concentrated near the boundary faults,the reflecting features were more complex.Based on the theory of sequence stratigraphy and sedimentary mode of fault basin,through the statistics and comparison of wave impedance values of various lithological properties,the method of seismic inversion and phase-plane method were mainly used to recognize and explain the geological bodies with special lithology.On the basis of isochronous stratigraphic framework,the reservoirs,hydrocarbon accumulation and oil and gas distribution are studied,favorable zones are established,drilling targets are chosen to provide target positions for drilling.更多还原