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伦坡拉盆地丁青湖组沉积期古水体环境恢复及其地质意义

Reconstruction of Paleowater Environment and Its Geological Significance of the Dingqinghu Formation in the Lunpo La Basin

Environment and Resource / 2026,8(1): 81-89 / 2026-03-09 79 52

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• Authors: 杨城¹² 付修根¹² 文天翔¹² 聂应³
• Information:

  1. 西南石油大学地球科学与技术学院，成都；
  2. 西南石油大学羌塘盆地研究院，成都；
  3. 中国地质调查局油气资源调查中心，北京

• Keywords:
  Oil shale; Pyrite; Lunpola Basin; Dingqinghu Formation; Organic matter enrichment
  油页岩; 黄铁矿; 伦坡拉盆地; 丁青湖组; 有机质富集
• Abstract: As the only basin with industrial oil flow in Tibet, the Lunpola Basin in the study area is rich in oil shale and has great research value. From the analysis of previous studies on the Lunpola basin, it is concluded that the Lunpori area with a large amount of oil shale is an ideal area for studying organic matter enrichment, but the detailed relationship between the paleo‑depositional water environment and organic matter enrichment is not clear, and there are few discoveries and studies on pyrite in the area. In this paper, based on the description of layer section and profile analysis to recover sedimentary phases in Lunpori area, the relationship between organic matter enrichment and paleosol sedimentary environment is carefully explored by the characteristics of pyrite fugitive morphology, grain size and distribution combined with TOC measurement. It is found that the morphology of pyrite and the particle size distribution of strawberry pyrite indicate that the oil shale section was deposited in an anoxic and sulfidic environment, and the TOC content indicates that the oil shale section was enriched with a large amount of organic matter. Combined with previous studies on organic matter sources in the Dingqinghu Formation of the Lunpola Basin, the large amount of organic matter sources and the anoxic and sulfidized sedimentary water environment are the main controlling factors for the organic matter enrichment in the Lunpori oil shale section. 研究区伦坡拉盆地作为西藏地区唯一发现有工业油流的盆地，该地区伦坡日剖面发育有油页岩且十分丰富，具有极大的研究价值。从前人对伦坡拉盆地的研究分析得出，拥有大量油页岩的伦坡拉盆地是研究有机质富集较为理想的区域，但是详细的古水体沉积环境和有机质富集的关系尚不清楚，且前期对该地区黄铁矿的发现和研究较少。本文在对伦坡日地区进行层段描述和剖面分析恢复沉积相的基础上，通过黄铁矿的赋存形态、粒径大小和分布情况等特征结合TOC的测量细致探讨有机质富集与古水体沉积环境的关系。通过研究和实验发现，黄铁矿形态和草莓状黄铁矿粒径分布情况指示油页岩层段沉积古水体环境为缺氧环境和硫化环境，TOC含量指示油页岩层段有大量有机质富集。结合前人在伦坡拉盆地丁青湖组有机质来源的研究，大量的有机质来源和缺氧、硫化的沉积水体环境是伦坡日油页岩层段有机质富集的主控因素。
• DOI: https://doi.org/10.35534/er.0801010
• Cite: 杨城，付修根，文天翔，等．伦坡拉盆地丁青湖组沉积期古水体环境恢复及其地质意义［J］．环境与资源，2026，8（1）：81-89.