牛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），2009，24（1）：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R_o抑制现象（负异常）。研究结果表明，R_o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，R_o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R_o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R_o负异常现象。

关键词： 东营凹陷 烃源岩 R_o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, 2009，24（1）：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 (R_o) of the lacustrine source rocks. The abnormal value of R_o is from 0.01%~0.25%. The stat. show positive linear relation between the abnormal value of R_o and exitinite and sapropelinite contents, and the stat. show negative linear relation between value of R_o and hydrogen content, H/O, and positive linear relation between value of R_o and oxygen content. The section of suppression of R_o 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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