Oil & Gas Geology ›› 2008, Vol. 29 ›› Issue (1): 11-18.doi: 10.11743/ogg20080102

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Geological features and significance of base-surge deposits

Liu Zhaojun, Miao Qiaoyin, Liu Xiang, Liu Rong   

  1. Earth Science College, Jilin University, Changchun, Jilin 130061, China
  • Received:2007-09-03 Online:2008-02-24 Published:2012-01-16

Abstract:

Base-surge deposits,commonly considered as a special kind of pyroclastics,are aqueous pyroclastics that are produced by explosive magma-water interaction.Volcanic explosion provides rich material resources for base-surge.Base-surge deposits are characterized by accretionary lapilli and large-scale dunelike structures,therefore they can be easily differentiated from other volcanoclastic rocks.The clastic texture of base-surge deposits is dominated by volcanic pisolite and gravel mostly in half-round shape,followed by round shape,and some in subangular shape.Since base-surge deposits have some characters of pyroclastic debrits and sedimentary rocks,they serve as excellent oil and gas reservoirs.In addition,study on its genesis is helpful for preventing and forecasting disaster.

Key words: geological feature, framework and structure, phreatomagmatic eruption, base-surge deposit

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