准噶尔盆地南缘芦草沟组页岩地球化学特征及沉积环境分析——以准页3井为例  

Geochemical Features and Sedimentary Environment Analysis of Lucaogou Formation Shale in Southern Junggar Basin——A Case Study of Well ZY3

作　　者：陈健 庄新国[2] 吴超[3] 刘晓峰[2] 周继兵[3] 

机构地区：[1]广东煤炭地质局,广州510000 [2]中国地质大学(武汉)构造与油气资源教育部重点实验室,武汉430074 [3]新疆维吾尔自治区地质矿产勘查开发局第九地质大队,乌鲁木齐830000

出　　处：《中国煤炭地质》2017年第8期32-38,共7页Coal Geology of China

基　　金：新疆维吾尔自治区地质勘查基金项目<新疆准噶尔盆地南缘重点远景区页岩气调查评价>的下属专题<准噶尔盆地南缘重点远景区页岩气成藏条件及资源潜力研究>

摘　　要：通过对准页3井中芦草沟组页岩样品测试数据进行分析,探讨了页岩样品的地球化学特征及垂向变化规律,进一步阐述了其沉积环境指示意义及变化特征。结果表明准页3井芦草沟组页岩中Al和K偏低,Na、Ca和Fe偏高,P元素明显富集,整体属于较为干旱的环境;Sr/Ba与B参数特征说明芦草沟组整体处于半咸水-咸水沉积环境,垂向上盐度含量不断增大;Fe^(2+)/Fe^(3+)、V/V+Ni、V/Cr、LREE/HREE、δCe和δEu参数特征表明芦草沟组整体为酸化弱还原环境下近源沉积,而下段为贫氧环境,中上段为厌氧环境,且受北天山陆源碎屑和火山灰间歇性影响,为有机质的输入和保存提供了较为有利的条件。Through analysis of Lucaogou Formation shale samples from the well ZY3, has discussed shale samples geochemical features and vertical variation pattern; and then further expounded its sedimentary environmental indicative significance and variation features. The result has shown that the elements AI and K on the low side in well ZY3 Lucaogou Formation shale, Na, Ca and Fe on the high side and P obviously enriched; indicated a rather arid environment as a whole. The Sr/Ba and B parametric features indicated brackish water to salt water sedimentary environment as a whole; from bottom to top the salinity continuously increasing. The Fe2~/Fe3＋ , V/~ ＋ Ni, V/Cr, LREE/HREE, 6Ce and 6Eu parametric features indicated Lucaogon Formation is a kind of proximal sedimentation under acidification weak reduction environment as a whole, while lower member under oxygen poor environment, middle and upper members under anaerobic environment. Because of intermittent impacts from the northern Tianshan Mts. terrigenous clasts and volcanic ash have provided rather favorable condition for organic matter entering into and preservation.

关 键 词：芦草沟组 地球化学 沉积环境 准噶尔盆地 

分 类 号：P618.2[天文地球—矿床学]