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气相色谱指纹法的理论基础和反相液相色谱法的预处理方法在计算合采井原油产量分配时暴露出一些缺点。引入广泛用于测定多组分体系中各金属离子浓度的偏最小二乘紫外光谱法 ,可以有效地避免这些问题。不同层位的原油在生、运、聚的过程中 ,由于所经历的地质色层效应和次生作用 (如生物降解 )存在着差别 ,致使原油对紫外光谱的吸收产生可检测的差异。因此 ,可根据朗伯比耳定律建立原油吸光系数 (ε)与产量分配百分比的线性叠加关系 ,用以精确求解合采井各单油层的产量分配。使用该方法在进行数据处理时 ,应考虑 4个方面的因素 :( 1 )在所选波长范围内 ,吸光度与浓度的线性关系要好 ;( 2 )在 2 0 0～ 40 0nm波长范围内 ,尽量选取单层原油吸光系数差异大的波长段 ;( 3)定量分析波长范围应尽量选择“峰顶”区域 ;( 4 )尽量避免尖峰。
The theoretical basis of gas chromatographic fingerprinting and the method of reversed-phase liquid chromatography preconditioning reveal some shortcomings in the calculation of the production distribution of combined crude oil. Partial Least Squares Ultraviolet Spectroscopy (UVLS), which is widely used to determine the concentrations of various metal ions in multicomponent systems, can be effectively avoided. Different layers of crude oil in the process of raw, transportation, and gathering, due to differences in the geological chromatography effects and secondary effects (such as biodegradation) experienced, resulting in the crude oil on the absorption of UV spectra produced a detectable difference. Therefore, a linear superposition of the oil absorption coefficient (ε) and the percentage of yield distribution can be established according to Lambert’s law to accurately determine the yield distribution of the individual oil reservoirs in a well. There are four factors that should be considered when using this method for data processing: (1) The linear relationship between absorbance and concentration is better in the selected wavelength range; (2) In the wavelength range of 200 ~ 400 nm, Select the single-layer crude oil absorption coefficient difference between the large wavelength range; (3) Quantitative analysis of the wavelength range should be selected “peak” area; (4) try to avoid spikes.