准噶尔盆地南缘中二叠统芦草沟组油页岩地球化学特征

发布时间：2018-06-17 11:04

  本文选题：准噶尔盆地南缘 + 芦草沟组　； 参考：《长安大学》2015年硕士论文

【摘要】：随着我国油气能源对外依赖程度逐年攀升,油页岩这种非常规能源受到了广泛的重视。我国油页岩资源丰富,其中准噶尔盆地探明油页岩资源量为4×108t。本文在前人研究基础上,以典型野外露头剖面踏勘、实测、样品采集及室内样品分析测试为依据,在芦草沟组油页岩地层对比、环境分析及岩石学特征分析基础上,通过油页岩岩石热解分析及油页岩抽提物气相色谱-质谱分析,评价油页岩有机质丰度、类型及成熟度,探讨油页岩母质来源、成因及生烃潜力,为研究区油页岩勘探开发提供依据。研究区在中二叠统芦草沟组沉积时期为以淡水为主间或有半咸水介入的内陆湖泊,主要发育滨湖、浅湖以及半深湖-深湖相沉积。油页岩岩石热解参数中,总有机碳含量平均为8.68%、生烃潜量(S1+S2)平均为40.81mg/g,表明油页岩以中等品位为主;氢指数、母质类型指数及降解率参数指示有机质类型较好,主要为II1型干酪根;最高热解峰温(Tmax)平均为439℃,表明有机质成熟度较低,主要处于低熟-成熟演化阶段。热解参数显示芦草沟组油页岩具有较大的生烃潜力。油页岩抽提物生物标志化合物参数m(∑nC21-)/m(∑nC22+)、m(Pr)/m(nC17)-m(Ph)/m(nC18)比值关系图、C27-C28-C29甾烷三角关系图表明研究区油页岩形成于弱还原-还原环境、有机质类型主要为腐殖-腐泥型、成烃母质主要来源于藻类等低等水生生物。m(Ts)/m(Tm)、C3117α-升藿烷m[22S/(22S+22R)]、m(莫烷)/m(藿烷)值、C29甾烷ββ/(ββ+αα)与αααC29甾烷20S/(20S+20R)比值关系图以及视镜质体反射率(Rc)等参数表明芦草沟组油页岩处于低熟-成熟演化阶段。研究区油页岩埋藏深度较浅、矿层分布稳定、资源量丰富、生烃潜力较大,具有良好的开发前景,适用于露天开采、地面干馏制取页岩油的异地开采法开采。
[Abstract]:With the increasing degree of external dependence of oil and gas energy in China, oil shale, as an unconventional energy source, has been paid more and more attention. China is rich in oil shale resources, of which the proved oil shale resource in Junggar Basin is 4 脳 108 t. On the basis of previous studies, this paper is based on typical outcrop profile survey, field measurement, sample collection and laboratory sample analysis and testing, on the basis of oil shale stratigraphic correlation, environmental analysis and petrological characteristics analysis of the Lucaogou formation. Through pyrolysis analysis of oil shale rock and gas chromatography-mass spectrometry analysis of oil shale extract, the abundance, type and maturity of organic matter in oil shale are evaluated, and the source, origin and hydrocarbon generation potential of oil shale are discussed. It provides the basis for oil shale exploration and development in the study area. During the deposition period of the Lucaogou formation of the Middle Permian, the study area was an inland lake mainly composed of fresh water and brackish water, mainly developed littoral lake, shallow lake and semi-deep lacustry-deep lacustrine facies. In the pyrolysis parameters of oil shale, the average content of total organic carbon is 8.68, and the potential of hydrocarbon generation is 40.81 mg / g, indicating that the oil shale is mainly of medium grade, and the hydrogen index, parent material type index and degradation rate parameter indicate that the organic matter type is good. The average peak temperature of pyrolysis is 439 鈩，

本文编号：2030817