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为查明青藏高原乌丽冻土区是否存在天然气水合物以及弄清天然气水合物气源,在对该区可能的烃源岩样品有机碳含量、岩石热解、镜质体反射率测定等分析基础上,结合分子生物标志化合物分析技术,对乌丽地区二叠系和三叠系泥岩、炭质泥岩和煤进行了有机质来源、沉积环境以及热演化程度等方面的初步研究。结果表明,该区烃源岩发育于还原的海陆交互相沉积环境,有机质母质为低等水生生物输入与陆源高等植物的混合生源输入,部分样品低等水生生物来源占优势;除个别样品外,甾烷异构化参数和升藿烷异构化参数达到平衡点。上二叠统那义雄组部分泥岩层段有机碳含量较高且含煤层段较厚,处于过成熟热演化阶段,其可能为研究区内较好的气源岩;而上三叠统巴贡组仅在八十五道班西为含煤地层,分布范围有限,可能仅为局部气源。
In order to find out whether natural gas hydrate exists or not, and to find out the gas source of gas hydrate in the Uliu Permafrost region of Qinghai-Tibet Plateau, the analysis of organic carbon content, rock pyrolysis and vitrinite reflectance of possible source rock samples in this area Based on the analysis of molecular biomarker analysis techniques, the origin of organic matter, sedimentary environment and degree of thermal evolution of Permian and Triassic mudstone, carbonaceous mudstone and coal in Wuli area were studied. The results show that the source rocks of this area are developed in the reduced sedimentary environment of sea and land interaction. The organic matter is the input of mixed source of lower aquatic organisms and higher terrestrial plants, and the source of lower aquatic organisms of some samples is dominant. Except individual samples, Isomerization isomerization parameters and hopane isomerization parameters reached equilibrium point. Upper part of the Upper Yerxei Formation of Upper Permian mudstone has higher organic carbon content and thick coal seam, which is in the stage of over-mature thermal evolution, which may be the better source rock in the study area. The Upper Triassic Ba The tribute group is only located in the 85th Baxi coal-bearing strata, with a limited distribution and may only be a local gas source.