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以东营凹陷沙四段上部烃源岩为研究对象，利用电子探针微区测试技术，对同生、成岩及成岩期后不同阶段碳酸盐矿物进行了系统分析，揭示出不同古地理位置碳酸盐成分的三种变化情况，即Mg／Ca比值①由高到低，②一直保持很高，成岩期后降低，和③由低到高，反映了不同层段从沉积到成岩直至成岩期后水体或孔隙流体盐度的三种变化历程，进而确定了该凹陷中心区域烃源岩成岩过程中处于高盐度介质环境中，对于分析该区油气生成条件具有重要意义。本文的研究思路和方法对于其它地区的类似工作也有一定借鉴意义。
Taking the upper source rocks of Shahejie Formation in Dongying Sag as the research object, the carbonate minerals in different stages of syngenetic, diagenetic and diagenetic stages were systematically analyzed by using the electronic probe micro-area testing technique to reveal the distribution of carbon The three changes in the composition of the acid salts, ie, the Mg / Ca ratio ① from high to low, ② remained high, decreased after diagenesis, and ③ from low to high, reflecting the different layers from deposition to diagenesis until diagenesis And the salinity of the water body or pore fluid in the sag, so as to confirm that the source rock in the central area of the sag is in a high salinity medium during diagenesis, which is of great significance for the analysis of hydrocarbon generation conditions in this area. The research ideas and methods of this article also have some reference for similar work in other regions.