摘要
合肥盆地的发育经历了基底形成、坳陷、断陷及构造反转等阶段的演化,进一步可以划分为坳陷盆地发育期(早侏罗世—中侏罗世)、前陆盆地发育期(晚侏罗世)、走滑盆地发育期(早白垩世)、断陷盆地发育期(晚白垩世—古近纪)和盆地消亡期(新近纪—第四纪)等5个阶段。控制合肥盆地构造-沉积格局的关键构造变形期为:早燕山期、中燕山期、晚燕山期—早喜马拉雅期。合肥盆地差异构造变形特征十分明显,自南往北可以划分为3个构造带,即金寨—舒城逆冲—伸展叠合构造带、六安—肥西逆冲推覆-断陷叠合构造带、淮南—定远冲断-断陷叠合带。这种南北方向的构造分带性受NWW向展布的断裂带控制。笔者依据对盆地各构造形变区勘探潜力的分析,确立了淮南—定远冲断-断陷叠合带为Ⅰ类远景区,即最有利的构造形变区;六安—肥西逆冲推覆-断陷叠合带为Ⅱ类远景区,即有利构造形变区;金寨—舒城逆冲-伸展叠合构造带为Ⅲ类远景区,即较有利构造形变区。
The Hefei basin experienced evolutionary stages of basement formation,depression,rifting and tectonic inversion,and five structural stages have been further recognized as follows： development stage of J1-J2 depression basin,development stage of J3 foreland basin,development stage of K1 strike slip basin,development stage of K2-E rifted basin,and consuming stage of N-Q basin.The key tectonic changes controlling the tectono-stratigraphic framework of Hefei basin are Early Yanshanian,Central Yanshanian,Late Yanshanian and Early Himalayan movements.The structures in the study area are characterized by differential deformation.Three tectonic belts can be recognized,namely,Jinzhai-Shucheng,Liuan-Feixi,and Huainan-Dingyuan.The structural zoning was controlled by a series of NWW-trending fault zones and experienced four periods of tectonic deformation,i.e.,Early Yanshanian,Central Yanshanian,Late Yanshanian and Early Himalayan.A preliminary analysis of the exploration potential of the structural deformation zone reveals that Huainan-Dingyuan tectonic belt is the first-grade prospective area,i.e.,the most favorable structural deformation zone;Luan-Feixi belt is the second-grade prospective area,i.e.,an area beneficial to tectonic deformation;Jinzhai-Shucheng is of the third grade,i.e.,an relatively favorable structural deformation zone.
出处
《中国地质》
CAS
CSCD
北大核心
2011年第6期1584-1592,共9页
Geology in China
基金
全国油气资源战略选区调查与评价项目(XQ-2007-02)资助
关键词
多期构造演化
关键构造变形期
差异构造变形
油气保存
合肥盆地
poly-cycle tectonic evolution
key tectonic change
differential structural deformation
hydrocarbon reservation
Hefei basin
