Bohai crude oil identification by gas chromatogram fingerprinting quantitative analysis coupled with cluster analysis

By gas chromatogram, six crude oils fingerprinting distributed in four oilfields and four oil platforms were analyzed and the corre- sponding normal paraffin hydrocarbon （ including pristane and phytane） concentration was obtained by the internal standard methed. The normal paraffin hydrocarbon distribution patterns of six crude oils were built and compared. The cluster analysis on the normal paraffin hydrocarbon concentration was conducted for classification and some ratios of oils were used for oils comparison. The results indicated： there was a clear difference within different crude oils in different oil fields and a small difference between the crude oils in the same oil platform. The normal paraffin hydrocarbon distribution pattern and ratios, as well as the cluster analysis on the nomad paraffin hydrocarbon concentration can have a better differentiation result for the crude oils with small difference than the original gas chromatogram.

徐深1井深层天然气地球化学特征与各类气源岩的贡献

徐深1井4个井段天然气甲烷组分都占烃类含量的97%以上,演化程度随着埋深而增加。随着演化程度加深,链烷烃脱甲基、环烷烃开环作用、芳构化作用和烷基化程度不断提高。营城组天然气甲烷碳同位素值比乙烷的重,碳同位素值都有反序特征;火石岭组天然气甲烷碳同位素值为-29.20‰,乙烷碳同位素值未检测到。徐深1井营城组具有腐殖型特征,处于高-过成熟演化阶段;火石岭组则具有腐泥型特征,为高-过成熟天然气。利用烃源岩及天然气烃指纹色谱技术和模拟计算软件建立了源岩贡献比例计算模板。经模板计算,徐深1井营城组天然气来自沙河子组烃源岩的占54%以上;火石岭组天然气来自火石岭组烃源岩的占50%,来自沙河子组烃源岩的占43.08%。营城组和石炭—二叠系烃源岩对营城组和火石岭组天然气的贡献均较小。

原油烃指纹GC法在三元复合驱油井分层产能测试中的应用

通过三元复合液与水驱原油作用实验认为,三元复合液对原油烃指纹影响小;通过分层原油配比实验及测试与MFE法分层测试结果对比认为,两种测试方法具有很好的一致性,原油烃指纹色谱测试法适用于三元复合驱油井,为三元复合驱油井分层产能测试及驱油效果监测提供了有效的方法。

气相色谱-质谱联用判识稠油井主产层

针对稠油的黏度高,族组成中非烃和沥青含量高,饱和烃和芳香烃含量低,全烃色谱图很难反映各油层与井口原油的差异性,应用气相色谱指纹判识稠油井的主要产油层位困难等问题,利用辽河油田某多层混采稠油井各产油层的储层岩石(储层沥青)和混采原油作样品,进行饱和烃和芳香烃色谱-质谱实验,通过星形图分析、聚类分析、因子分析等技术的分析和研究,有效地判识了该多层混采稠油井的主要产油层位,并提出了有针对性的生产调整建议,从实施情况来看,效果明显。该方法具有适用性强、投资少、周期短、准确、快速等特点,有推广应用的前景。

气相色谱识别油水层的实验研究

利用气相色谱仪测量储层烃类色谱指纹图 ,根据谱图形态、未分辨化合物含量、碳数范围等特征可以定性识别储层的产液性质。文章分别列举了该方法在低阻油层、高阻水层等方面的实验研究结果。由于此方法不受储层岩石组成及储层流体物理性质的影响 ,只与储层流体的化学性质有关 ,所以气相色谱法识别疑难层是一种简洁有效的方法。