在砂泥质剖面中,通过解释电测曲线来评价储层流体(油/气/水)类型,对于地层评价专家来说,通常几乎是没有困难的。这种评价通常是通过综合运用探测含气带典型低氢、低电子密度的中子密度探测器和重复地层测试器(RFT)完成的,即用压力梯度和脉冲识别的技术评价储层流体。不过,在尼日尔三角洲,许多砂岩含气层段其中子密度测井质量都差,而重复地层测试器测试已被大量淘汰,因为粗劣的井孔状态通常都会阻塞测试器。井壁岩芯提取物的残烃油指纹能提供一种判别储层流体类型的独立方法。(译者注:fingerprint在本文的意思是,根据含油岩、含气岩、含水岩样品提取物做出的色层分离谱,具有明显不同的特征,就象人的指纹一样具有指示意义,故译为“指纹”——这也是本文方法的最大特点和有用之外)。 连同尼日利亚国家石油公司在内,我们用尼日尔三角洲西部海上Mefa油田各类井孔井壁岩芯样品的溶剂提取物,完成了一大批色层分离分析。井壁岩芯提取物的油指纹清楚地反映了储层中烃类的类型。饱和油砂岩的指纹典型地超过所有的原油(C_(15)+),而从气占优势的砂岩中提取的烃指纹则表现为更典型的凝析气的简略烃分布。产水层段提取的指纹,表现为更简略的特征,表明高分子重烃没有进入这些层段。不管样品保存如何粗劣(由于延长保存时 In sand-shale profiles, reservoir fluid (oil / gas / water) types are evaluated by interpreting electrical measured curves, which are generally not difficult for the evaluation of formation experts. This evaluation is usually done by a combination of the detection of typical low-hydrogen, low-electron-density neutron density detectors with gas bearing belts and a repetitive formation tester (RFT) that uses pressure gradient and pulse identification techniques to evaluate reservoir fluids. However, in the Niger Delta, many of the sandstone gas bearing sections have poor neutron density logging, and repeated formation tester tests have been largely phased out as poor borehole conditions often clog the tester. Residual hydrocarbon fingerprints of the core-wall core extract provide an independent method of discriminating reservoir fluid types. (Translator’s Note: The fingerprint in this article means that chromatograms obtained from chromatograms of oil-bearing rocks, gas-bearing rocks, and water-bearing rock samples have markedly different characteristics and are indicative of human fingerprints Translated as “fingerprints” - this is also the most prominent feature of the method of this article and useful). Together with the Nigerian National Oil Company, we completed a large number of chromatographic separations using solvent extracts from various types of wellbore core samples from the Mefa field offshore the western Niger Delta. Oil fingerprints of core wall core extract clearly reflect the type of hydrocarbons in the reservoir. Fingerprints of saturated oil sands typically exceed all of the crude oil (C_ (15) +), while hydrocarbon fingerprints extracted from gas-dominated sandstones exhibit a more typical condensed hydrocarbon condensate profile. The fingerprints extracted from the aquifer section show a more simple feature, indicating that the polymer heavy hydrocarbons did not enter these layers. No matter how bad the sample is stored (due to prolonged storage