Research on diagenetic sealing of Nanbaijiantan fault in northwestern margin of Junggar Basin
Online published: 2011-10-20
From the point of sealing mechanism，the factors that affect the closure property of fault are smear effect, fragmentation and diagenesis. Diagenesis is the dominant factor for the gradually closed effect of quiescent fault. Diagenesis types that affect the closure property of faults are compaction and packing action, as well as cementation, which are all constructive for the closure property of faults. Based on the seismic, well logging and testing data, combined with core and rock slice observation, the quantitative calculation method is applied to carry out the study on the diagenesis of Nanbaijiantan fault in northwestern margin of Junggar Basin. The result shows that because of the strong compaction and packing action, as well as cementation, the faulted zone in Nanbaijiantan has lower porosity and permeability, and the fault has good closure property. Through structure division of faulted zone, combined with core and rock slice observation, it is considered that the influence area of diagenetic sealing in the study area ranges from 50 to 80 meters.
Key words： Archean; magmatic rocks; reservoir characteristics; Dongying Sag
GE Zhidan , WANG Xingzhi , ZHU Meng , PU Rui , WANG Wei , ZHANG Jinyou . Research on diagenetic sealing of Nanbaijiantan fault in northwestern margin of Junggar Basin[J]. Lithologic Reservoirs, 2011 , 23(5) : 43 -48 . DOI: 10.3969/j.issn.1673-8926.2011.05.009
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