基浪堆积物(岩)地质特征及其地质意义

doi:10.11743/ogg20080102

摘要/Abstract

摘要：

基浪堆积物(岩)被认为是一种特殊的火山碎屑物(岩),主要是岩浆在上升的过程中与地表水或地下水相作用发生爆炸,冲破上覆岩层,并伴随出现基浪沉积而成的水成火山碎屑物,火山爆炸为基浪堆积物提供充足的物质来源.增生火山砾及发育的大型似沙丘构造是基浪堆积物(岩)的典型指相标志,可以和其他火山碎屑岩相区别;在碎屑结构上基浪堆积中多为火山豆、火山砾,多呈半圆状,少数为圆状,个别呈次棱角状.由于基浪堆积物兼具有火山碎屑及沉积岩的特征,因此可作为良好的油气储集体:而且对其成因的研究可起到防灾预警的作用.

关键词: 地质特征, 结构构造, 蒸气岩浆喷发, 基浪堆积物

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

中图分类号:

TE121

刘招君,苗巧银,刘祥,等. 基浪堆积物(岩)地质特征及其地质意义[J]. 石油与天然气地质, 2008, 29(1): 11-18. doi: 10.11743/ogg20080102 Liu Zhaojun,Miao Qiaoyin,Liu Xiang,et al. Geological features and significance of base-surge deposits[J]. Oil & Gas Geology, 2008, 29(1): 11-18. doi: 10.11743/ogg20080102

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