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- Title
松辽盆地梨树断陷东南斜坡白垩系主力烃源岩 特征及生烃史.
- Authors
周城汉; 李 卓; 杨磊磊; 胡 静; 向世琦; 王 孟
- Abstract
The main source rock of the Lishu Fault Depression in the Songliao Basin has not yet been identified. In order to reveal the Cretaceous hydrocarbon accumulation law of the southeast slope of the Lishu Fault Depression in the Songliao Basin, this paper conducted the source rock evaluation and the comparison of oil and gas sources in the shale samples of the Shahezi Formation and Yingcheng Formation of the southeast slope area of the Lishu Fault Depression, and then recovers the hydrocarbon history of the source rock. The result shows that the source rocks of the Cretaceous Shahezi Formation and Yingcheng Formation of the Lishu Fault Depression have relatively good organic carbon content and hydrocarbon production potential, belonging to mediumgood source rocks. The identification of kerogen components and biomarker shows that the chalky source rock of the southeast slope belongs to kerogen type II-Ⅲ, which is a mixed source of aquatic organisms and terrestrial higher plants and forms in a reducing environment, with a medium degree of thermal evolution, and the source rocks still in the oil-producing stage. The results of oil source comparison show that the oil and gas in the southeast slope area are all derived from the source rocks of the Shahezi Formation. The results of the reconstruction of the history of hydrocarbon production show that the source rocks of Shahezi Formation and Yingcheng Formation reached the hydrocarbon production threshold at 97 Ma and 94 Ma, respectively, and entered the peak of hydrocarbon production at 92 Ma and 89 Ma. After 66 Ma, Lishu Fault Depression was raised as a whole, and the ground temperature gradient decreased, and the hydrocarbon production effect is weakened. Geochemical analysis combined with hydrocarbon history reconstruction technology can be well used to determine the characteristics of the main source rocks in the multi-spin superposition basin, and it plays an important role in clarifying the distribution law of oil and gas reservoirs
- Subjects
NATURAL gas laws; GAS reservoirs; HYDROCARBON analysis; EARTH temperature; PETROLEUM reservoirs; SOLAR stills
- Publication
Natural Gas Geoscience, 2023, Vol 34, Issue 6, p1053
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2022.12.007