【摘要】 南堡凹陷断裂发育,但断裂与本区丰富的油气有何关系还不明确。通过对地震资料的构造解释和断裂统计来研究断裂的基本特征。在此基础上,结合本区圈闭条件、储层条件和油气运移条件,来研究断裂对油气的控制作用。分析认为,南堡凹陷内部的断裂以NEE向或者近NE向断裂为主,在剖面上形成了"坡坪式"、"铲式"、"多米诺式"等多种构造样式。南堡凹陷内部的断裂可划分为3个级次:一、二级断裂发育于古近纪,一级控凹断裂发育时间最早、持续时间长、活动强度大,二级断裂控制局部构造、发育时间稍晚;三级断裂多为新近纪以来发育的次级断裂,断裂发育时间晚,活动强度小。在不同级次断裂的控制下,本区形成了其特殊的石油地质条件。本区断裂系统对油气成藏的控制作用表现在3个方面,即断裂的发育有利于各类圈闭的形成;断裂引起的裂缝扩大了油气的储集空间;断裂封闭性的差异使得深部油气运移至浅部聚集。更多还原

【Abstract】 Nanpu Sag has well developed faults,yet the relationship between the faults and abundant oil and gas is not clear in the study area.The paper studied the basic characteristics of faults through seismic interpretations of structures and statistical analysis of the fault distribution.On this basis and combing with the conditions of trap,reservoir and hydrocarbon migration,the paper researched the controlling effects of the faults on the oil and gas accumulation in Nanpu Sag.The results indicate that the majority of the faults trending NEE or NE in the Nanpu Sag,showing structural styles such as "flat and ramp style","listric style" and "domino style" and so on in the section.The faults within the Nanpu Sag can be classified into three orders,with the first-and se-cond-order faults being developed in the Paleogene.The first-order faults control the formation of the sag and are characterized by the earliest development,long duration and strong intensity.The second-order faults control the local structures,and were developed later than the first-order faults.The third-order faults are mostly secondary faults formed since the Neogene with weak intensity.Unique petroleum geological conditions occur in the study area due to the control of faults of different orders.The controlling effects of the fault system on hydrocarbon accumulation are represented in three aspects,that is,the occurrence of faults benefits for the formation of various types of traps,the fractures caused by faults enlarge the reservoir space for oil and gas accumulation,the diversity of sealing ability of faults prompts hydrocarbons to migrate from the deep to shallow reservoirs where they accumulate.更多还原