东濮凹陷多断多凸多洼构造特征及成因  

T Characteristics and genetic analysis of multi-fault,multi-convex and multi-depression structure in Dongpu Sag

作　　者：余海波 YU Haibo(Research Institute of Geophysical Prospecting,Zhongyuan Oilfield,SINOPEC,Puyang 457001,Henan,China;Postdoctoral Research Station of Zhongyuan Oilfield Company,Puyang 457001,Henan,China)

机构地区：[1]中国石化中原油田分公司物探研究院,河南濮阳457001 [2]中国石化中原油田分公司博士后科研工作站,河南濮阳457001

出　　处：《石油地质与工程》2024年第3期1-8,共8页Petroleum Geology and Engineering

基　　金：中国石化科技部项目“环前梨园洼陷高精度地震成像技术及有利目标评价”(P23226)和“华北地区战略选区研究”(P22064)。

摘　　要：从渤海湾盆地入手研究东濮凹陷的构造特征,利用地震剖面、钻井、测井等资料对东濮凹陷进行分区、分带、全层系构造解析。研究表明:1)东濮凹陷印支期挤压南北分区,燕山期弱挤压、古近纪沙四段-沙三段沉积期强烈拉张东西分带,古近纪晚期开始强走滑-弱拉张错断成块,具有多应力叠合时空演化的构造特征,呈现平面上隆洼相间、垂向上洼中有隆、断裂棋盘式交错的构造格局。2)东濮凹陷宏观上经历了四期构造演化,发育逆冲-拉张-走滑断裂系统,根据构造变形应力期次叠合特征,将中-古生界构造样式分为两类九种,古近系构造样式主要分为背斜、断阶和背形三大类共十四种。3)板块构造活动引起的地幔上拱和深断裂右旋走滑位移是东濮凹陷新生代形成的根本动力学原因;古近系基底横向构造的存在、兰聊断层活动分期分段性差异及控洼断层大量发育,单断大洼向多断多凸多洼转变;古近纪晚期浅层发育大量的四五级断层对洼陷和凸起进行调节改造,走滑构造应力逐步加强,断层在平面上分布形态从侧列变为羽列,导致多断多凸多洼格局发生扭动构造变形,复杂的断块群构造定型,早期形成的油气藏被调整改造,为东濮凹陷精细勘探和开发提供重要支撑。Starting from the Bohai Bay Basin,the structural characteristics of Dongpu Depression are studied,and the structural analysis of Dongpu depression is carried out with the data of seismic section,drilling and logging.The results show that:1)Dongpu Sag has the characteristics of multi-stress superposition space-time evolution of the Indosinian compressional north-south zone,the Yanshanian weak compressional,the Paleogene Sha4-Sha3 strong tensile east-west zone,and the late Paleogene strong strike-slip weak tensile fault block.It presents a tectonic pattern of alternating upturns in plane,upturns in vertical depressions and checkerboard interleaving faults.2)Dongpu Sag has undergone four stages of structural evolution and developed a thrust-extension-strike-slip fault system.According to the superposition characteristics of tectonic deformation stress,the Middle Paleozoic tectonic styles in Dongpu Sag can be divided into two categories and nine types,and the Paleogene tectonic styles can be divided into anticlinal,fault stage and back type,and a total of 14 types.3)Right-lateral strike-slip displacement of mantle overarching and deep faults caused by plate tectonic activities is the fundamental dynamic cause of Cenozoic formation in Dongpu Sag.The existence of the Paleogene basement lateral structure,the difference of the activity stages of the Lanliao fault and the development of a large number of depression-controlling faults,and the transition from single depression to multi-fault,multi-convex and multi-depression.A large number of grade 4 and 5 faults developed in the late Paleogene shallow layer adjusted the depression and bulge,gradually strengthened the strike-slip tectonic stress,and the distribution pattern of faults in the plane changed from lateral row to column row,resulting in the twisting tectonic deformation of the multi-fault,multi-convex and multi-depression pattern,the early formed oil and gas reservoirs have been adjusted and transformed,which provided a good theoretical support for the fine explo

关 键 词：东濮凹陷 构造应力 构造样式 构造演化 断裂系统 

分 类 号：P548[天文地球—构造地质学]