准噶尔盆地石炭系火山岩储层岩性岩相模式  

Lithology-lithofacies model of Carboniferous volcanic reservoirs in the Junggar basin,NW China

作　　者：孙中春[1] 蒋宜勤[1] 查明[2] 陈中红[2] 常秋生[1] 徐春丽[1] 

机构地区：[1]中国石油新疆油田分公司勘探开发研究院,新疆克拉玛依834000 [2]中国石油大学(华东)地球科学与技术学院,山东青岛266580

出　　处：《中国矿业大学学报》2013年第5期782-789,共8页Journal of China University of Mining & Technology

基　　金：国家重点基础研究发展计划(973)项目(2011CB201101);国家重大科技攻关项目(2011ZX05001-001-006)

摘　　要：综合运用地质、地球物理和地球化学资料,对准噶尔盆地石炭系火山岩储层进行系统的岩石学和岩相学研究,分析了该区不同火山岩岩石学特征及判别标准,以此为基础结合大地构造背景建立了该区域火山机构类型与模式,讨论了该区域爆发相和溢流相交替出现的复杂岩相特征及模式,划分了盆内火山喷发旋回,明确了该区火山岩多期次喷发和多旋回特征.结果表明:该区石炭系火山岩以中基性火山岩为主,主要为玄武岩、玄武质安山岩和安山岩;发育少量酸性流纹岩,以中低钾为特征;各类岩石具有良好的电测响应,玄武岩类声波时差和自然伽玛值最低,流纹岩类声波时差和自然伽玛值最大,安山岩类和英安岩类介于二者之间;火山碎屑熔岩类主要为凝灰熔岩,少部分角砾熔岩,碎屑间为岩浆胶结.火山机构在平面上可划分为以火山通道-爆发相为主的近火山口带、次火山岩相过渡带与远火山口相,各相带具有不同的岩石组合类型与岩相复合类型.按"岩性-组构-成因"标准,将准噶尔盆地腹部石炭系火山岩岩相划分为4相组、6相、10亚相.将上石炭统划分成了3个火山层序、8个火山旋回.Comprehensive application of geology, geochemistry and geopnysics,the study systematically researched on the lithology and lithofacies of Carboniferous volcanic reservoirs in Junggar Basin, and analyzed the different lithology characteristics of the volcanic rock and its discriminate standard. Based on this and tectonic background, this research established the re- gional types and models of volcanic edifice, and discussed the complicated lithofacies character- istics and modes in this region where explosive and effusive facies alternately appeared. The re- sults show that： volcanic rocks of Junggar basin are mainly basic-intermediate rocks, including basalt, basaltic andesite and andesite; minor acidic rhyolite develops, with characteristics of in- termediate-lower potassium; all kinds of rock has good electric logging response, basalts have lowest response in the interval transit time and natural gamma, rhyolites have highest response in the interval transit time and natural gamma, and andesitses and dacites fall in between ha-salts and rhyolites~ pyroclastic lava includes tuff lava and few breccias lava whose debris is ce- mented by magma. The volcanic edifice was divided into three types of facies： volcano chan- nels-erupting facies near the crater, subvolcanic rock facies in the transitional zone and volcanic facies far from the crater according to the distance of volcanic center. These facies have differ- ent characteristics of lithology and lithofacies. According to the law of lithology-component- formation, there are 4 facies groups, 6 facies and 10 sub-facies in the volcanic rocks of Junggar basin, and 3 volcanic sequences and 8 volcanic cycles in the upper Carboniferous.

关 键 词：岩性岩相 火山旋回 火山机构 石炭系 准噶尔盆地 

分 类 号：P618[天文地球—矿床学]