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    羌塘盆地沃若山地区上三叠统土门格拉组烃源岩沉积环境分析

    冯兴雷, 付修根, 谭富文, 陈文彬

    冯兴雷, 付修根, 谭富文, 陈文彬. 羌塘盆地沃若山地区上三叠统土门格拉组烃源岩沉积环境分析[J]. 沉积与特提斯地质, 2018, 38(2): 3-13.
    引用本文: 冯兴雷, 付修根, 谭富文, 陈文彬. 羌塘盆地沃若山地区上三叠统土门格拉组烃源岩沉积环境分析[J]. 沉积与特提斯地质, 2018, 38(2): 3-13.
    FENG Xing-lei, FU Xiu-gen, TAN Fu-wen, CHEN Wen-bin. Sedimentary environments of the Upper Triassic Tumengela Formation in the Woruo Mountain area in the Qiangtang Basin,Xizang[J]. Sedimentary Geology and Tethyan Geology, 2018, 38(2): 3-13.
    Citation: FENG Xing-lei, FU Xiu-gen, TAN Fu-wen, CHEN Wen-bin. Sedimentary environments of the Upper Triassic Tumengela Formation in the Woruo Mountain area in the Qiangtang Basin,Xizang[J]. Sedimentary Geology and Tethyan Geology, 2018, 38(2): 3-13.

    羌塘盆地沃若山地区上三叠统土门格拉组烃源岩沉积环境分析

    基金项目: 

    羌塘盆地金星湖-隆鄂尼地区油气资源调查项目(DD20160159)

    详细信息
      作者简介:

      冯兴雷(1982-),男,硕士,工程师,主要从事沉积学和储层地质学研究。E-mail:fxinglei@yeah.net

    • 中图分类号: P595

    Sedimentary environments of the Upper Triassic Tumengela Formation in the Woruo Mountain area in the Qiangtang Basin,Xizang

    • 摘要: 岩石学、沉积相、元素地球化学的综合分析结果表明,羌塘盆地沃若山地区上三叠统土门格拉组(T3t)地层为三角洲沉积;整体富含水解性元素、Fe族元素以及上部砂岩Fe元素富集(高Fe/Mn比值)的特征表明古水体环境为较浅的河口-滨岸环境;CIA值(63.8~79)、ICV值(0.52~1.4)和Ga/Rb-K2O/Al2O3关系图解分析结果显示当时为风化强度中等、较温暖的半干旱-半湿润气候;Sr/Ba比值全部小于1(0.09~0.27),表明沉积水体为盐度较低的陆相淡水;根据V、U、Mo的含量比值,判断其为氧化-弱氧化的富氧水体环境。较为温湿的气候有利于生物的繁殖,但氧化-弱氧化的环境不利于有机质的富集,限制了该地区烃源岩发育:土门格拉组烃源岩的TOC含量为0.76%~1.46%(均值为1.04%),属中等品质的烃源岩。
      Abstract: This paper focuses on the study of the sedimentary environments of the source rocks from the Upper Triassic Tumengela Formation (T3t) in the Qiangtang Basin, Xizang, in the light of petrology, geochemistry and sedimentary facies analysis. The sedimentary environments of the source rocks in the Upper Triassic Tumengela Formation is assigned to the delta sedimentary facies. The enrichment of the hydrolytic elements, iron group elements, and the element Fe (Fe/Mn ratios) in the upper sandstones indicates the shallower river mouth to onshore environments. The values of CIA (63.8-79), ICV (0.52-1.4) and Ga/Rb vs. K2O/Al2O3 diagrams show the moderate weathering under the semi-arid to semi-humid climatic conditions. The Sr/Ba ratios are all less than 1 (0.09 to 0.27), indicating the low-salinity and fresh continental sedimentary environments. The V, U and Mo contents also indicate the anoxic-suboxic water environments. The warmer and wetter climates are beneficial to the reproduction of organisms, while the anoxic-suboxic environments are not constructive to the enrichment of organic matter. The low TOC values of 0.76% to 1.46% (mean value is 1.04%) have disclosed that the source rocks should be assigned to the medium-quality source rocks in the study area.
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    出版历程
    • 收稿日期:  2018-02-10
    • 修回日期:  2018-04-08
    • 发布日期:  2018-06-29

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