沉积学报2011，Vol.29Issue(6)：1156-1163,8.
三塘湖盆地马朗凹陷卡拉岗组火山岩岩性及岩相特征研究
Characteristics of Lithology and Lithofacies of Kalagang Volcanic Rocks in Malang Depression,Santanghu Basin
摘要
Abstract
Comparison and classification of volcanic rocks are the premise and foundation of their lithology research,lithofacies and variation.According to log data,seismic data and pollen analysis,we found that the Kalagang volcanic rocks of Malang depression in Santanghu Basin were thick in the north and east,thin in the south and westareas.The pollen assemblage showed that Gymnosperm pollen had a clear advantage in fern spores and comprised of Genus Cordaitina（Samoilovichi） Hart,Genus Florinites Sehof,WilSonet Bentall,Genus Protohaploxypinus（Samoilovichi） Hart,Genus Striatoabieites（Sedova） Hartpollen.The content of Genus Cordaitina（Samoilovichi） Hart was up to 25.3~54.3%.Compared the log response of Kalagang volcanic rocks and Sedimentary rocks,there performed low natural gamma,low acoustic time,low compensation neutrons,high density and high resistance.The natural gamma value of Kalagang volcanic rocks was lower than Harjiawu Formation,while the resistance was higher.The lithology was mainly mafic-neutral basalt and andesite,and minor of the tuff,tuffite,volcanic breccia,and so on.Kalagang volcanic rocks of Malang depression can be divided into outbreak phase,overflow phase and volcanic sediment facies.The volcanic activity mainly occurred as a relatively quiet overflow phase,followed by strong eruption phase,and locally developed volcanic sediment facies.关键词
马朗凹陷/卡拉岗组/火山岩岩相Key words
Malang depression/Kalagang Formation/volcanic lithofacies分类
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梁浩,苟红光,王志矿,崔娥,孟旺才,张志更..三塘湖盆地马朗凹陷卡拉岗组火山岩岩性及岩相特征研究[J].沉积学报,2011,29(6):1156-1163,8.基金项目
中国石油天然气股份有限公司科技研发项目（编号：2008B-01）资助 （）
