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Origins and Fates ofCO2 in the DongyingDepression of theBohai Bay Basin Liuping ZhangAiguo WangZhijun Jin2011 год

Origins and Fates of CO2 in the Dongying Depression of the Bohai Bay Basin
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Аннотация: CO 2 gas reservoirs have been found in a series of rift basins in East China. The objective of this study is to reveal origins and fates of CO 2 in the Dongying Depression in East China by using isotopic (He and C) and molecular compositions. 3 He/ 4 He, CO 2 / 3 He and δ 13 C CO2 values indicate that the CO 2 gases with CO 2 > 79% in the deep fault belts in the depression are predominantly mantle-derived. In contrast, CO 2 in most gases in the relative stable areas, where source rocks are developed, is less than 10%. Based on helium isotope and δ 13 C CO2 ∼ CO 2 / 3 He diagram, it was found that 10−30% of these CO 2 gases is mantle-derived, 28% to 68% is limestone-decomposed and 18% to 54% sedimentary organic in the relative stable areas. The mantle-derived and limestone-decomposed CO 2 in the relative stable areas indicates that the mantle-derived geo-fluid met the source rocks. More hydrocarbons can be generated via its heat influence. As the previously published model is not suitable for study of CO 2 fates at least in the case of thermogenic CO 2 addition, we proposed two models for CO 2 addition and loss: model I for CO 2 loss and limestone-decomposed CO 2 addition and model II for CO 2 loss and addition of sedimentary organic CO 2 , based on a δ 13 C CO2 ∼ CO 2 / 3 He diagram. By using the new models, it was revealed that the loss rates of mantle-derived CO 2 can be as high as 50–99.99% for most gases in the depression, the addition rates of limestone-decomposed CO 2 range from 18% to 150%, and the addition rates of sedimentary organic CO 2 from 11% to 230%. From this study, it was revealed that more mantle-derived CO 2 entered the Dongying Depression than previously recognized.
Год издания: 2011
Авторы: Liuping Zhang, Aiguo Wang, Zhijun Jin
Издательство: SAGE Publishing
Источник: Energy Exploration & Exploitation
Ключевые слова: Hydrocarbon exploration and reservoir analysis, Geological and Geochemical Analysis, CO2 Sequestration and Geologic Interactions