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烃源岩热演化与有机组分相关性(西安石油大学学报)

已有 2641 次阅读 2009-4-4 18:15 |个人分类:科研成果|系统分类:科研笔记|关键词:烃源岩,油气勘探| 油气勘探, 烃源岩

38井湖相烃源岩镜质体反射率负异常与有机组分含量相关性

陈中红,等。西安石油大学学报(自然科学版),2009241):29-34.

对东营凹陷牛38井古近系沙河街组有机碳富集的沙三中、下层段烃源岩(有机碳含量平均值分别达到2.0%4.0%)进行了大量样品的分析测试及研究,发现该层段烃源岩存在明显的Ro抑制现象(负异常)。研究结果表明,Ro异常值与壳质组含量、腐泥组含量呈正向线性统计关系,而与镜质组含量呈负向线性统计关系,与惰质组关系不明显。在剖面分布上,Ro抑制层段对应较高含量的壳质组与腐泥组。H含量及H/O比呈负向线性统计关系,与O含量呈正向线性统计关系。单从有机成因角度分析,高含量富氢的壳质组、腐泥组是Ro出现负异常的主要原因。针对该盆地的深层油气勘探应考虑到可能出现的Ro负异常现象。

关键词: 东营凹陷 烃源岩 Ro异常  成熟度 镜质组反射率

Relationship between the SUPPRESSION OF VITRINITE REFLECTANCE OF LACUSTRINE SOURCE ROCKS from NIU-38 WELL in Dongying sag AND the contents of organic components 

Chen Zhonghong, etc.  Journal oc Xian Shiyou University, 2009241):29-34.

(China University of Petroleum, Dongying, Shandong, 257061)

The member 3 of Shahejie Formation, main source rock section of Well Niu-38 is closely surveyed and analyzed to investigate the obvious suppression of vitrinite reflectance (Ro) of the lacustrine source rocks. The abnormal value of Ro is from 0.01%~0.25%. The stat. show positive linear relation between the abnormal value of Ro and exitinite and sapropelinite contents, and the stat. show negative linear relation between value of Ro and hydrogen content, H/O, and positive linear relation between value of Ro and oxygen content. The section of suppression of Ro is corresponding to high contents of exitinite and sapropelinite. The results shows: high contents of hydrogen-rich exitinite and sapropelinite is the controlling factor for the suppression of vitrinite reflectance, and the suppression appeared when liptinite content is over 40% (hydrogen content is about 2%).



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