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渤中坳陷有东营组下段、沙河街组一段及三段等 3套烃源层。如何通过地球化学特征区分沙河街组和东营组烃源岩 ,进而确定该区的主力烃源层 ,是长期困扰有关地球化学研究者的问题之一。文中对渤中坳陷及其周边陆区 31块烃源岩样品和 35个原油样品的饱和烃、芳烃进行了色谱 质谱分析和研究 ,提出用伽马蜡烷 /C31升藿烷 (S +R)、4 甲基甾烷 /C2 9规则甾烷、三芳甾烷 /三芳甲藻甾烷和稳定碳同位素等 4个地球化学参数组合 ,可以有效地区分渤中坳陷的 3套烃源层 ,并初步确定了用于判断该区混源油的 3个地球化学参数的下限值。
There are three sets of hydrocarbon source layers in the lower part of Dongying Formation, the first and third sections of Shahejie Formation in the Bozhong Depression. How to differentiate the source rocks of Shahejie Formation and Dongying Formation by means of geochemical characteristics to determine the main hydrocarbon source in this area has long been one of the problems that has plagued geochemical researchers. In this paper, 31 hydrocarbon source rock samples and 35 crude oil samples of the Bozhong Depression and its surrounding areas were analyzed by means of mass spectrometry and mass spectrometry (MS). The proposed method was characterized by gamma-wax / C31-hopane (S + R ), 4 methyl steranes / C2 9 regular steranes, triarylstananes / triaromatic steranes and stable carbon isotopes, which can effectively distinguish three sets of hydrocarbon source rocks in the Bozhong Depression, And the lower limit of the three geochemical parameters used to determine mixed oil in this area has been preliminarily determined.