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    合肥盆地构造演化、差异变形及油气勘探前景

    Tectonic evolution, differential deformation and gas exploration prospect of Hefei basin

    • 摘要: 提要: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。

       

      Abstract: Abstract: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.

       

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