白云巖化作用類型及機理——以歧口凹陷古近系沙河街組一段為例
[Abstract]:The dolomite of the first member of the Paleogene in Qikou Sag was studied by means of microscopic identification and geochemical analysis. The types of rocks developed in the study area and their genesis were comprehensively analyzed. The results show that mud-microcrystalline dolomite, lime-dolomite, dolomitic limestone and a small amount of granular dolomite are developed in the study area, and the Sr/Ba value is 0.44.9V / Ni = 1.37.1Z (salinity index) distributed in 122.6162.5; The 87Sr/86Sr value is very close to that of the seawater in the same period, so it is inferred that the lake basin suffered transgression, which provided Mg~ (2) for dolomization, and the order distribution was 0.22 0.53, which was relatively low. The Mg/Ca value is 0.730.91, which reflects the characteristics of rich calcium and low magnesium, indicating that dolomite was formed in the quasi-syntectic stage. Carbon and oxygen isotopic analysis shows that dolomite was formed in shallow burial environment and affected by fermentation. The abnormal high Sr value also reflects the existence of microbial activity. It is inferred from the above evidence that the dolomite in this area was formed by osmotic reflux and was influenced by fermentations in the quasi-syntectic and shallow burial environment.
【作者單位】: 吉林大學(xué)地球科學(xué)學(xué)院;大港油田勘探開發(fā)研究院;長春工程學(xué)院勘查與測繪工程學(xué)院;遼寧省地震局;
【基金】:國家自然科學(xué)基金項目(41502145) 吉林省教育廳“十三五”科學(xué)技術(shù)研究規(guī)劃項目(2016-0313)~~
【分類號】:P618.13
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