文档介绍：
济阳坳陷挤压构造发育特征与成因机制探
讨#
李伟*
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(中国石油大学(华东)地球科学与技术学院,山东青岛,266580)
摘要:以最新的三维地震资料为基础,结合钻井数据,对济阳坳陷地质历史时期发育的挤压
构造进行了判识,探讨了不同期次挤压构造的成因机制,结果表明:济阳坳陷存在晚三叠世、
晚白垩世、古近纪末期三个主要构造挤压期,其中晚三叠世挤压构造形成于扬子板块向华北
板块俯冲所产生的南南西→北北东向水平挤压应力场,以北西(西)向逆冲断层与挤压褶皱
发育为主;晚白垩世深部新的岩石圈诱导浅部挤压收缩,挤压应力主要来自于盆地东部,产
生的挤压构造主要发育在盆地的东北部地区,走向多为近南北向;古近纪末期挤压机制与晚
白垩世相似,但典型的挤压构造相对较少,与古近纪强烈的断陷沉降所形成的巨厚沉积地层
形变较难有关,可能的逆冲断层发育在北西向的陈南断层东段。
关键词:挤压构造;成因机制;盆地转型;济阳坳陷
中图分类号:P548
Characteristic and formation mechanism of the
compressional structures in Jiyang depression
Li Wei
(School of Geosciences, China University of Petroleum, Qingdao 266555)
Abstract: Based on the newest 3-Dimension seismic data and drilling data, pressional
structures of the geological history in Jiyang depressiion were identified, and its formation
mechanism was also analyzed, the results showed that Jiyang depression experienced three
pression periods, including late Triassic, late Cretaceous and the end of Paleogene.
pressional structures developed in late Triassic were controlled by the SSW-NNE
trending pression stress which came from the Yangtze plate's subdcution and
collision to North China, and the collison resulted in the formation of widespread developed
NW(W) trending thrust faults pressional folds; during late Cretaceous the deep new
lithosphere induced pression and shrinkage in shallow layers and pression stress
primarily came from the eastern of the basin, so the pressional structures were
mainly developed in the northeastern of the basin with NS(NNS, NNE)-trending; pressive
mechanism at the end of Paleogene was similar to that of late Cretaceous, however, the typical
compressional structures were relatively less developed, which might have something with the
hard distortion of the thick strata developed by the subsidence in the strong fault depression of
Paleogene, and the possible thrust fault might be located in the east part of NW-trending Chennan
fault.
Key words: Compression struct