微量元素在霸县凹陷油源对比中的应用

APPLICATION OF TRACE ELEMENTS IN OIL SOURCE CORRELATION OF BAXIAN SAG

丁志敏

Ding Zhimin

作者用发射光谱测定了冀中坳陷霸县凹陷下第三系、石炭二叠系和奥陶系6个层位75个原油样和360个生油岩样的18种微量元素的丰度,计算了14个丰度比值。根据这些资料,用聚类分析法进行了油-油对比,又用判别分析法建立了各层系生油岩的判别函数式,再用二级判别分析法进行了油-岩对比。判别结果:第三系原油来自下第三系母岩;石炭二叠系凝析油及轻质油来自石炭二叠纪煤系,属于煤成油;奥陶系原油一部分来自下第三系母岩,另一部分轻质油来自石炭二叠系母岩。

The emission spectra were used to determine the abundances of 18 trace elements contained in 75 crude oil samples and 360 source-rock samples from six strata of the Ordovician. Permo-Carboniferous and Paleogene of the Baxian Sag of the Jizhong Depression, Hebei Province, and 14 abundance ratios are calculated by the author. Based on these data, this paper made an oil-oil correlationby cluster analysis and established a discriminant funtion of source rocks by dis-criminant analysis, and made an oil-source rock correlation by secondary discri-minant analysis. The result shows that the Tertiary crude oil comes from Eogene source rocks; the Permo-Carboniferous condensate and light oil are from C-P coalseries; a part of Ordovician light oil is from C-P source rocks and the rest arefrom the Eogene.

10.11743/ogg19870204