中国石油大学学报（自然科学版）2018，Vol.42Issue(1)：1-10,10.DOI:10.3969/j.issn.1673-5005.2018.01.001
饶阳凹陷古近系沙河街组古地震记录及地质意义
Ancient earthquake records of Palaeogene Shahejie Formation in Raoyang Sag and their geological significance
摘要
Abstract
In Raoyang Sag,a large number of soft-sediment deformation structures caused by earthquakes were observed in Palaeogene Shahejie Formation along its east steep slope, the central uplift belt and the northern Renqiu paleoburial hill zone. These soft-sediment deformation structures were mainly autochthonously caused by liquefaction and stretch-extrusion effects. A vertical sequence of seismits could be established and classified into five intervals from bottom to top,which were syn-sedimentary fault interval,seismic breccia interval,liquefied sandstones dyke interval, soft-sediment deformation inter-vals and liquefies homogeneous interval,respectively. Our research shows that seismites were mostly developed in the third member of Shahejie Formation,indicating that basin-controlling and buried-hill-controlling faults were strongly active in the period and frequently triggered earthquakes of magnitude higher than 5. The closer to the eastern fault zone of the sag, the more types and bigger sizes of the seismitic structures were developed, whereas no ancient earthquake records have been found in the western gentle slope. Our results may help to recover tectonic activities and buried hill uplift features of Raoyang Sag in terms of sedimentology. Moreover, the research also has found that microfaults and microfissures developed in seis-mites are able to improve the reservoir permeability greatly,forming potential oil and gas reservoirs or migration channels.关键词
地震岩/控盆断层/沙河街组/饶阳凹陷/古近系Key words
seismites/basin-controlling fault/Shahejie Formation/Raoyang Sag/Palaeogene分类
天文与地球科学引用本文复制引用
杨剑萍,李亚,李凤群,李运娥,韩娟,安光亮,杨鹏辉,尹俊霞..饶阳凹陷古近系沙河街组古地震记录及地质意义[J].中国石油大学学报（自然科学版）,2018,42(1):1-10,10.基金项目
国家自然科学基金项目(41302078) （41302078）
国家科技重大专项(2011ZX05006-002) （2011ZX05006-002）
