准南芦草沟组页岩有机地球化学特征及非常规油气地质意义

发布时间：2018-01-06 00:09

  本文关键词：准南芦草沟组页岩有机地球化学特征及非常规油气地质意义　出处：《中国石油勘探》2017年04期 　论文类型：期刊论文

  更多相关文章： 准噶尔 芦草沟组 页岩气 干酪根类型 有机碳含量 有机质成熟度

【摘要】：在四川盆地页岩气勘探开发取得巨大成功之后,为了评价准噶尔盆地南缘页岩气资源潜力,结合地表地质调查及页岩气调查井钻探成果,对准噶尔盆地南缘芦草沟组泥页岩有机地球化学特征进行了博格达东段与西段及芦草沟组内部上段与中段、下段和露头与钻井的详细对比研究,并指出了芦草沟组的非常规油气潜力。研究结果表明:(1)芦草沟组有机质类型以岩石热解进行划分的结果比镜检结果更趋合理,且干酪根主要为Ⅰ型及Ⅱ_1型,Ⅱ_2型及Ⅲ型所占比重相对较小,Ⅲ型干酪根在博格达东段比西段发育。(2)芦草沟组有机质丰度高,77%的样品其TOC≥2%,TOC主要介于3.0%~4.0%之间;平面上,博格达西段芦草沟组TOC高于博格达东段;纵向上,中段TOC高于上段,而上段高于下段。(3)芦草沟组有机质镜质组反射率峰值为0.8%,T_(max)主要介于440~450℃之间,有机质处于成熟阶段为主;芦草沟组在博格达东段抬升暴露略早于博格达西段,所经历的热演化程度略低于博格达西段。(4)准南芦草沟组具较好的致密油与页岩气勘探潜力,而且博格达西段芦草沟组页岩气勘探潜力可能好于博格达东段。
[Abstract]:After the great success of shale gas exploration and development in Sichuan Basin, in order to evaluate the potential of shale gas resources in the southern margin of Junggar Basin, the drilling results of surface geological survey and shale gas survey well are combined. The organic geochemical characteristics of mud shale of Lucaogou formation in the southern margin of Junggar Basin are compared and studied in detail between the eastern and western sections of Bogda and the upper and middle segments of the inner part of the Lucaogou formation, the lower section and outcrop and drilling. The unconventional oil and gas potential of the Lucaogou formation is pointed out. The results show that the organic matter types of the Lucaogou formation are classified by rock pyrolysis, which is more reasonable than the results of microscopic examination. The kerogen was mainly type 鈪，

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