柴达木盆地团鱼山地区浅湖油页岩特征、成因及成矿模式——以青柴地2井为例
投稿时间:2022-02-10  修订日期:2023-05-20  点此下载全文
引用本文:徐银波.柴达木盆地团鱼山地区浅湖油页岩特征、成因及成矿模式——以青柴地2井为例[J].地质与勘探,2023,59(5):1103-1116
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徐银波 中国地质调查局油气资源调查中心, 北京中国地质调查局非常规油气重点实验室, 北京吉林大学地球科学学院吉林长春 bicaiqin@mail.cgs.gov.cn 
基金项目:国家自然科学基金(编号:41772092)和中国地质调查局地质调查项目(编号:DD20230325, DD20221581, DD20230751)联合资助
中文摘要:我国陆相油页岩资源丰富,通常沉积于深湖-半深湖、湖沼以及浅湖环境,其中浅湖油页岩主要发育于柴达木盆地、老黑山盆地、黄县盆地等地区。为研究浅湖油页岩的特征和成因,分析其成矿模式,对柴达木盆地团鱼山地区的青柴地2井石门沟组含煤段浅湖油页岩样品分别开展了有机碳、热解、含油率、灰分、挥发分、密度、发热量、主微量元素、X衍射等测试分析。结果显示,研究区油页岩为中灰分、高挥发分、低密度、高发热量、低-中等含油率的油页岩。该油页岩的有机质丰度高,有机质类型为II2型,成熟度为未成熟。其矿物组成主要为粘土矿物和石英,组成元素以SiO2、Al2O3和TFe2O3为主,具有P2O5、Co、Cu、Zn、Ga、Mo、Ba、Th、U等元素富集,SiO2、TFe2O3、MgO、Na2O、CaO、K2O、TiO2、MnO、Li、V、Cr、Ni、Rb、Sr、Zr等元素亏损的特点。油页岩沉积时具有温暖湿润的气候条件,微咸水-淡水的水体盐度和弱氧化-弱还原的保存条件。分析各环境因素显示,水体深度相对较大,水动力条件相对较强,盐度相对较高,保存条件越好,以及偏碱性的水体条件有利于有机质的富集和油页岩的形成,据此建立了研究区浅湖油页岩的形成模式。
中文关键词:成因 成矿模式 油页岩 浅湖环境 石门沟组含煤段 团鱼山地区 柴达木盆地
 
Characteristics, genesis and metallogenic model of shallow-lake oil shale in the Tuanyushan area of Qaidam Basin: A case study of the well QCD-2
Abstract:China contains abundant continental oil shale resources, which were generally deposited in deep-semi deep lake, swamp, and shallow-lake environments. Shallow-lake oil shales were mainly developed in the Qaidam Basin, Laoheishan Basin and Huangxian Basin. Aiming to determine the characteristics and genesis of shallow-lake oil shale and the metallogenic model, this work tested shallow-lake oil shale samples from the coal-bearing section of the Shimengou Formation of well QCD- 2 in the Tuanyushan area of Qaidam Basin, and analyzed the total organic carbon, rock eval, oil yield, ash content, volatile content, density, calorific value, major and trace elements, and X-ray diffraction. Results show that oil shale contains medium ash content, high volatile, low density, high calorific value, and low-medium oil yield. It includes high TOC, the organic matter is type II2, and is immature. The minerals are dominated by clay minerals and quartz, and its constituent elements are mainly SiO2, Al2O3 and TFe2O3. It is characterized by the enrichment of P2O5, Co, Cu, Zn, Ga, Mo, Ba, Th and U, and the depletion of SiO2, TFe2O3, MgO, Na2O, CaO, K2O, TiO2, MnO, Li, V, Cr, Ni, Rb, Sr and Zr. During the deposition of the oil shale, the climate was warm and humid, the water salinity was brackish-freshwater, and the redox condition was weak oxidation-weak reduction. The analysis of various environmental factors indicates that relatively deep water, strong hydrodynamic conditions, relatively high salinity, better preservation, and alkaline water conditions are conducive to the enrichment of organic matter and the formation of oil shale. The formation model of the shallow-lake oil shale in the study area was also established.
keywords:genesis, metallogenic model, oil shale, shallow-lake environment, coal-bearing member of Shimengou Formation, Tuanyushan area, Qaidam Basin
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