The chemometric methods alternating least squares and multidimensional scaling were employed in this study to quantify the relative contribution of the sources and identify the affinities of sixty–five crude oil samples collected in the Zhanhua Depression. The circos diagram was used to reflect the relative contributions of different source rocks. Based on these techniques, two end–members (EMs) were identified which represent the geochemical characteristics of two regional source–rocks (Es₃^L and Es₄^U). The EM1 composition assigned to Es₃^L is characterized by relatively low C₃₅/C₃₄ homohopane ratio and relatively low abundance of gammacerane. This EM is consistent with a source facies that was deposited in freshwater lacustrine environment that contained a non–stratified water column and suboxic to dysoxic bottom waters. Distributions of the regular steranes and tricyclic terpanes, the relatively low steranes/hopanes ratio suggest the organic matter input into this source facies were combined microalgal material and terrestrial organic matter. Oils from the Bonan Sag and Gubei Sag were derived mainly from this source facies. In contrast, EM2 has been assigned to the Es₄^U source rock and is characterized by relatively high abundance of gammacerane, C₃₅/C₃₄ homohopane ratio greater than one, suggesting deposited in a saline to hypersaline lacustrine environment that contained a stratified water column with strongly reducing bottom waters. Distributions of the regular steranes and tricyclic terpanes as well as relatively high steranes/hopanes ratio suggest the organic matter deposited in this setting was mainly derived from microalgal/bacterial sources. Oils from the Luojia Nose and Chanjiazhang High were derived mainly from this source facies. Mixed contributions of these two source facies (end–members) account for the compositions of crudes produced in the Yihazhuang Arch and Gudao High. In the case of the Yihezhuang Arch the crudes appear to have near equal contributions from the two source faces, whereas crudes from the Gudao High appear to have slightly higher contributions from the Es₃^L source facies than from the Es₄^U source facies.

本研究采用交替最小二乘法和多维标度的化学计量方法来量化来源的相对贡献并确定在沾化坳陷收集的 65 个原油样品的亲和力。circos图用于反映不同烃源岩的相对贡献。基于这些技术，确定了代表两个区域烃源岩（Es ₃ ^L和 Es ₄ ^U）地球化学特征的两个端元（EM ）。分配给 Es ₃ ^L的 EM1 成分的特点是 C ₃₅ /C ₃₄相对较低高霍烷比率和伽马蜡烷的相对较低的丰度。该 EM 与沉积在淡水湖相环境中的源相一致，该环境包含非分层水柱和低氧至缺氧的底水。常规甾烷和三环萜烷的分布，相对较低的甾烷/藿烷比率表明输入到该源相的有机质是微藻物质和陆地有机质的组合。渤南凹陷和古北凹陷石油主要来源于该源相。相比之下，EM2 已归属于 Es ₄ ^U烃源岩，其特征是伽玛蜡烷 C ₃₅ /C ₃₄丰度较高高藿烷比值大于 1，表明沉积在含分层水柱的含盐分高盐度湖相环境中，底水强烈减少。常规甾烷和三环萜烷的分布以及相对较高的甾烷/藿烷比率表明沉积在该环境中的有机物主要来自微藻/细菌来源。罗家鼻和单家漳高油主要来源于该源相。这两种源相（端元）的混合贡献解释了伊哈庄拱和古道高产原油的组成。以和庄拱为例，来自两个源面的原油似乎具有几乎相等的贡献，而来自古道高的原油似乎来自 Es 的贡献略高₃ ^L源相比来自 Es ₄ ^U源相。