LITHOLOGIC RESERVOIRS ›› 2015, Vol. 27 ›› Issue (6): 48-54.doi: 10.3969/j.issn.1673-8926.2015.06.007

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Cemented sealing in Kexia fault zone in northwestern margin of Junggar Basin

Cui Dian   

  1.  Geology Scientific Research Institute ， Sinopec Shengli Oilfield Company ， Dongying 257000 ， Shandong ， China
  • Online:2015-12-20 Published:2015-12-20

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Abstract:

Kexia fault zone is a sublevel structural unit in northwestern margin of Junggar Basin. In the region from south to north, there are 5 major primary faults including Karamay fault, Nanbaijiantan fault, Baikouquan fault, Baiwu fault and Xiahongbei fault and many associated subsidiary faults. Based on the selected wells drilled cross fracture, combined with petrographic thin section and SEM analysis on the core sampling, it is found that the cement in the 5 primary faults are obviously different. From south to north, there are chlorite and laumontite, calcite, calcite and clay minerals, calcite and ferrocalcite, ankerite and siderite respectively in the 5 primary faults. It shows that from south to north diagenesis stage in Kexia fault zone tend to be late, which shows that Kexia fault zone experienced a process of cementation-denudationcementation. Combined with the analysis of fault activity and homogenization temperature test of fluid inclusions, it is considered that this is the result of differences of geofluid activity influenced by gradual advance of the fault activities.Cemented sealing of different faults and differences of geofluid activity can further affect the oil and gas distribution.

Key words: wave impedance , seismic response characteristics , AVO type , P-wave velocity , S-wave velocity , forward modeling , Yinggehai Basin

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