The evolution model and sealing of reverse fault in clastic strata
Received date: 2017-11-06
Revised date: 2018-03-04
Online published: 2018-04-10
In order to establish the reverse fault evolution model in clastic strata，on the basis of systematic observation and experimental analysis of the fault on the western margin of Qaidam Basin，combined with the research of the evolution of fault from both macroscopic and microscopic aspects，the internal structure and lateral sealing ability of different scale fault zones were analyzed.The results show that the evolution of fault zone has three stages：(1) When fault throw is minor，the fault is the “one factor” structure，it consists of damage zone and slipping surface；(2) When fault throw is moderate，the fault is the “two-factor” structure，it consists of damage zone and fault core，the fault core is filled with fault gouge and fault breccia；(3) When fault throw is large，the fault core is filled with fault gouge only.When a certain fault throw is reached，the fault begins to have certain sealing ability，the larger the fault scale (throw)，the greater the content of the fault gouge，the higher SGR，the greater the lateral sealing ability of the fault.
Key words： Clastic rock; Fault; Dual structure; Fault gouge; Breccia belt; Sealing
Yan Cheng-long，Wang Hai-xue，Fu Xiao-fei，Song Xian-qiang，Wu Tong，Gong Lei,Wang Wei-an . The evolution model and sealing of reverse fault in clastic strata[J]. Natural Gas Geoscience, 2018 , 29(4) : 529 -537 . DOI: 10.11764/j.issn.1672-1926.2018.03.001
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