LITHOLOGIC RESERVOIRS ›› 2015, Vol. 27 ›› Issue (5): 74-80.doi: 10.3969/j.issn.1673-8926.2015.05.012

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Sand injectites of Paleogene and its geological significance in Xihu Sag, East China Sea

Huang Lingyu1, Zhang Changmin1, Liu Jiangyan1, Xiang Xiaoling2, Xu Fa3, Hou Guowei3   

  1.  1. School of geosciences , Yangtze University , Wuhan 430100 , China ; 2. Research Institute of Experiment and Detection , PetroChina Xinjiang Oilfield Company , Karamay 834000 , Xinjiang , China ; 3. Shanghai Branch of CNOOC Ltd. , Shanghai 200030 , China
  • Online:2015-09-26 Published:2015-09-26

Abstract:

Based on foreign literature and reports, sand injectites were recognized in the Xihu Sag of East China Sea through an analytical comparison of regional tectonic settings and cores. These sand injectites are characterized by abundant of mudstone debris, liquefied sandstone dyke, water escape structure(dish-and-pillar structure), liquefied fold deformation structure, load cast and flame structure, as well as ball and pillow structure. The formation mechanism, core characteristics and geological significance of sand injectites were simply discussed from the aspect of sedimentology. The intrusion of sand can form intrusive traps and improve the porosity and permeability of reservoirs obviously at the same time, and then improve reservoir properties. So it is very important for lithologic reservoir exploration and development to correctly understand and further research the sand injectites.

Key words: deep dolomite, tectonic-lithofacies palaeogeography, platform margin, exploration directions, Cambrian;northern Tarim Basin

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