石油与天然气地质 ›› 2010, Vol. 31 ›› Issue (3): 300-308.doi: 10.11743/ogg20100305

• 石油与天然气地质 • 上一篇    下一篇

有机粘土复合体抽提特征及其石油地质意义

蔡进功 1 ,卢龙飞 1,2 ,宋明水 3 ,丁 飞 1 ,包于进 3 ,樊 馥 1   

  1. 1.同济大学海洋地质国家重点实验室,上海200092; 2.中国石油化工股份有限公司石油勘探开发研究院无锡石油地质研究所,江苏无锡214151; 3.中国石油化工股份有限公司胜利油田分公司勘探事业部,山东东营257015)
  • 出版日期:2010-08-24 发布日期:2010-09-02

Characteristics of extraction of organoˉclay complexes and their significance to petroleum geology

Cai Jingong 1 ,Lu Longfei 1,2 ,SongMingshui 3 ,Ding fei 1 ,Bao Yujin 3 and Fan Fu 1   

  • Online:2010-08-24 Published:2010-09-02

摘要:

对合成的(0号样)和天然的(从烃源岩中提取粒度小于2μm的1号样)有机粘土复合体,经氯仿和超临界流体相继抽提后进行抽提量、族组分及色谱分析,并对相继抽提的残渣进行总有机碳(TOC)、X-衍射(XRD)、红外(IR)和热分析检测,研究烃源岩中有机质的赋存方式及其石油地质意义。对有机粘土复合体进行氯仿和超临界流体相继抽提后,抽提量发生较大的变化,超临界流体抽提色谱的主峰碳向高碳数方向移动,反应了不同强度抽提剂获取有机质特征的差异。但是,抽提残渣的TOC含量仍较高,表明经相继抽提后粘土仍结合有大量的有机质。在抽提残渣的XRD曲线上,250℃时d001反射峰大于1.0nm,直至升温到550℃时d001反射峰移至1.0nm处,表明蒙脱石层间存在有机质。抽提前、后的有机粘土复合体,在差热(DTA)曲线上350℃附近出现显著的放热峰;在IR曲线上的有机质特征峰(2924,2852,1388和725cm -1 )和水的特征峰(1634cm -1 ),仅是强度有所减弱而均未发生位移,表明相继抽提并没有破坏粘土矿物层间结合的有机质。对比抽提前、后的特征认为,抽提获取了粘土表面吸附的的或孔隙间的有机质,而抽提残渣仍保留了粘土矿物层间结合的有机质,且数量较大和稳定,这些都与干酪根的特征不同。因此,应探索有机质生烃和资源评价参数研究的新思路,这对深化认识有机质生烃机理和油气勘探策略都具有重要的意义。关键词:抽提和残渣;有机质赋存;石油地质意义;有机粘土复合体

Abstract:

Two samples of organic clay complex,one is synthesized(sample No.0)and the other is natural(sample No.1with grain size less than2μm acquired from source rocks),are extracted by chloroform and suˉpercritical fluid successively.Analyses of extract volume,group composition,and GCˉMS were carried out and TOC,XRD,IR and thermal analysismethodswere applied to the residue to study the occurrence of organicmatˉter in source rocks and its significance to petroleum geology studies.The result reveals that the amounts of extract are quite different for chloroform and supercritical fluid.For the supercritical fluid,the dom inantGC peak of carˉbon shows a tendency ofmoving towards carbon with larger numbers,indicating a difference in characteristics of organicmatters revealed by different extraction agents.However,the TOC in the residue is stillhigh,showing that a significant amount of organicmatters still exist on clay surfaces after successive extraction processes.The XRD