【摘要】 位于渤海湾盆地中心的歧口凹陷在中生代、新生代经历了复杂的基底断裂改造过程,形成了大量的潜山构造。利用新采集的三维地震数据体,对不同位序潜山进行了构造落实,明确了中位序、低位序潜山的发育受控于印支期古构造及古近纪盆缘断裂,存在残丘型和断块型2种类型,残丘型潜山主要发育在滨海断裂系以北,勘探层系为奥陶系,断块潜山发育在其南部,勘探层系包括奥陶系、二叠系以及中生界;由于更靠近歧口生油气中心,中位序、低位序潜山油气源条件充沛,其在中生界、新生界经历了断裂褶皱改造,局部地区风化剥蚀作用强,储层发育,油气勘探潜力巨大。更多还原

【Abstract】 The reconstruction of complex basement faults in Mesozoic and Cenozoic caused a lot of buried hill formation in the Qikou sag of the center Bohai Bay basin.We use the new three-dimensional seismic data to find the different level buried hills,suggesting that two types of residual and fault-block buried hills would be controlled by the Indosinian palaeostructure and Paleogene basin-margin faults,respectively.The residual hill is mainly developed in the north of the coastal rifting,and the favorable exploration target is Ordovician.Meanwhile,the fault-block buried hill lies in the south of the coastal rifting,and the preferential exploration target is Ordovician,Permian and Mesozoic.The Qikou sag is located within the center of hydrocarbon generation intensity,so the abundant petroleum in the middle-and low-buried hills is filled.Although the alteration of faults and folds in Mesozoic and Cenozoic happened,and even the strong weathering erosion existed,the development of favorable reservoir would make the good potential for hydrocarbon exploration in the Qikou sag.更多还原