东濮凹陷濮城构造形成演化及油气前景  

Evolution and Hydrocarbon Prospects of Pucheng Structure in Dongpu Sag

作　　者：邹宇轩 陈书平[4] ZOU Yuxuan;CHEN Shuping(Key Laboratory for Digital Land and Resources of Jiangxi Province,East China University of Technology,Nanchang 330013,China;Institute of Geological Survey,East China University of Technology,Nanchang 330013,China;School of Earth Sciences,East China University of Technology,Nanchang 330013,China;School of Earth Sciences,China University of Petroleum(Beijing),Beijing 102249,China)

机构地区：[1]东华理工大学江西省数字国土重点实验室,江西南昌330013 [2]东华理工大学地质调查研究院,江西南昌330013 [3]东华理工大学地球科学学院,江西南昌330013 [4]中国石油大学(北京)地球科学学院,北京102249

出　　处：《东华理工大学学报（自然科学版）》2023年第1期21-29,共9页Journal of East China University of Technology(Natural Science)

基　　金：东华理工大学江西省数字国土重点实验室开放研究基金项目(DLLJ202107);东华理工大学博士科研启动基金项目(DHBK2019029)。

摘　　要：濮城构造油气地质条件优越,但其自身的构造特征及演化仍缺乏精细研究,制约了该区的油气勘探部署。通过综合利用地震和钻孔数据解析了濮城构造的变形特征及演化过程,并探讨了该构造的油气前景。研究表明,濮城构造存在北北东向、北东东-近东西向、近南北向三组断层,发育伸展构造、走滑构造和盐构造三类构造样式,具有南北分段的总体特征。濮城构造的形成演化可划为古近纪裂陷和新近纪-第四纪拗陷两大阶段,前者又可细分为初陷、深陷、萎缩和消亡4个时期。北北东向断层形成于初陷期-深陷期,北东东-近东西向断层、近南北向断层和濮城背斜形成于萎缩期,其中濮城背斜是伸展背景下因盐层的存在导致其上下层系变形不协调而形成的强制褶皱。区内与成藏期油源断裂相沟通的断块型圈闭、背斜型圈闭和裂缝型圈闭都是潜在的有利勘探区,其中濮城背斜转折端及附近原本较致密岩层可能形成裂缝发育区,是值得注意的油气勘探区域。The Pucheng structure has excellent geological conditions for oil and gas, but its own structural characteristics and evolution are still lack of detailed research, which restricts the deployment of hydrocarbon exploration in this area. Based on the comprehensive use of seismic and borehole data, the deformation characteristics and evolution process of the Pucheng structure are analyzed, and the hydrocarbon prospects of this structure are discussed. The results show that there are three groups of faults in the Pucheng structure: NNE-trending, NEE-EW-trending, and SN-trending faults. Three types of structural styles including extensional structure, strike-slip structure, and salt structure are developed, and the geological structure has the general characteristics of North-South segmentation. The formation and evolution of the Pucheng structure can be divided into two stages: the Paleogene rifting stage and the Neogene-Quaternary depression stage. The former can be subdivided into initial-rifting, deep-rifting, shrinkage, and extinction periods. The NNE-trending faults were formed in the initial-deep-rifting period, and the NEE-EW-trending faults, the SN-trending faults and the Pucheng anticline were formed in the shrinkage period. The Pucheng anticline is a forced fold formed by the presence of a salt layer which causes the deformation of its upper and lower layers to be out of harmony under extensional background. The fault block, anticline and fracture traps linked to the active oil-source faults during the accumulation period are all potentially favorable exploration areas. Among them, the fracture development area may be formed at the hinge zone of the Pucheng anticline and nearby relatively tight formation, which are a noteworthy hydrocarbon exploration area.

关 键 词：强制褶皱 构造样式 构造演化 濮城构造 东濮凹陷 

分 类 号：P618.13[天文地球—矿床学]