摘要
华北地区中-新生代以来的构造转换作用与渤海潜山圈闭和储层成因的关系研究较少。基于岩心、镜下薄片和地震等资料,并结合区域构造背景,厘清了渤海湾盆地渤中19-6区中-新生代构造转换特征及其对潜山地层、圈闭和太古宇储层的影响。研究表明,渤中19-6区潜山构造受华北、华南和古太平洋3大板块相互作用,主要经历了前印支期—印支期、印支期—燕山期和燕山期—喜马拉雅期3次构造转换作用,形成了北西向、北东向、近南北向和东西向4组断裂体系。印支期北西向断层控制了太古宇和古生界整体的圈闭和地层展布规律;燕山期北东向和近南北向断层使潜山圈闭更加复杂化,喜马拉雅期断陷下沉,潜山整体构造面貌最终定型。多幕次构造运动对太古宇潜山大规模裂缝的形成具有重要意义,其中印支期的逆冲推覆是太古宇规模性裂缝形成的关键时期,燕山期构造转换作用进一步扩大了太古宇裂缝储层发育规模,喜马拉雅期构造转换对早期裂缝“再活化”具有显著影响,多期时-空构造转换作用是太古宇发育大规模储层的关键。提出的中国东部中-新生代构造作用与潜山圈闭和储层成因的关联机制,为中国东部潜山储层预测提供了更有效的方法途径,对指导类似盆地内的潜山油气勘探具有重要意义。
There are few studies on the relationship between tectonic transformation in North China since the MesoCenozoic and the origin of traps and reservoirs in buried hills in the Bohai Bay Basin.The data of core,seismic and thin section observation,coupled with understanding on the regional tectonic background,are applied to clarify the characteristics of the Meso-Cenozoic tectonic transformation in Bozhong 19-6 area and its influence on buried-hill strata,traps and the Archaean reservoirs.It is shown that the buried-hill structure in Bozhong 19-6 area underwent tectonic transformations from the pre-Indosinian to Indosinian,from the Indosinian to Yanshanian and from the Yanshanian to Himalayan under the interaction of North China,South China and paleo-Pacific plates,resulting in four fault systems trending NW,NE,near NS and EW.The NW-trending faults formed in the period of Indosinian tectonism controlled the overall trap and stratigraphic distribution of the Archean and Paleozoic;The NW-and near NS-striking faults developed in the period of Yanshanian movement made the buried-hill traps more complex,and overall structure of the buried hills was finalized with the fault depression in the Himalayan period.Multi-episode tectonic movements are of great significance to the formation of large-scale fractures in the Archean buried hills,and the Indosinian overthrusting was critical to the formation of large-scale fractures in Archean.The Yanshanian tectonic activities further expand the scale of the Archean fractured reservoirs developed,and the Himalayan tectonic transformation has a significant impact on the"reactivation"of early fractures.Multi-stage spatiotemporal tectonic transformation is the key to the development of large-scale reservoirs in the Archean.The correlation mechanism between the Meso-Cenozoic tectonism and origins of buried-hill trap and reservoir in eastern China proposed in this study,provides a more effective method for mapping of buried-hill reservoirs in eastern China,and is of great significance to
作者
王德英
刘晓健
邓辉
刘永江
李德郁
Wang Deying;Liu Xiaojian;Deng Hui;Liu Yongjiang;Li Deyu(Tianjin Branch,CNOOC Ltd.,Tianjin 300459,China;Ocean University of China,Qingdao,Shandong 266100,China)
出处
《石油与天然气地质》
EI
CAS
CSCD
北大核心
2022年第6期1334-1346,共13页
Oil & Gas Geology
基金
中海油重大科技专项(CNOOC-KJ 135 ZDXM 36 TJ 08 TJ)。
关键词
多元地层结构
圈闭成因
太古宇潜山
构造转换
中-新生代
渤中19-6区
渤海湾盆地
multi-stratigraphic structure
trap genesis
Archean burried hill
structural transformation
MesoCenozoic
Bozhong 19-6 area
Bohai Bay Basin
