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- Title
海水侵入对湖相烃源岩形成的影响 ——以渤海湾盆地渤中凹陷西南缘沙三段泥岩为例.
- Authors
黄 谦; 徐耀辉; 王飞龙; 杨海风; 王 宁; 何家豪
- Abstract
Bozhong Sag is the largest hydrocarbon generation sag in Bohai Bay Basin, and the third member of the Shahejie Formation (E2s 3 ) is the most important source rocks. Previous studies have a certain understanding of source material, sedimentary environment and thermal evolution of the source rocks from the E²s ³, but the re⁃ search on sedimentary events and biological sources is not deep enough. Nine mudstone core samples from the E2s ³ in the southwestern Bozhong Sag were analyzed in detail based on organic-inorganic geochemistry and or⁃ ganic petrology. The results show that: (1) The middle and lower sections of the third member of Shahejie For⁃ mation are high-quality source rocks, but the quality of the source rocks in the lower section of the third member of Shahejie Formation is better. The increase of water salinity in warm and humid climate and the detection of 24-n-propylcholestane compounds reflected the occurrence of transgression events in the E2s 3 , and the transgres⁃ sion gradually increased from the lower sections to the middle sections of the E2s ³ . (2) The abundant presence of 4α -methyl-24-ethylcholestanes, 24-n-propylcholestanes, 2α -methylhopanes, and oleanane in the studied sam⁃ ples, and the presence of abundant algainite and a small amount of vitrinite indicate the diversity of hydrocarbonforming organisms in the source rocks of the E2s 3 . (3) The nutrient elements brought about by the moderate ma⁃ rine incursion in the lower part of the E2s ³ caused the flourishing of bacteria and algae, which provided abundant material basis for the formation of high-quality source rocks. However, due to the large-scale seawater intrusion in the middle of the E2s 3, the water eutrophication is weakened, resulting in a decrease in the quality of source rocks compared with the lower part of the E2s ³ .
- Subjects
SALTWATER encroachment; DRILL core analysis; GLOBAL warming; GEOCHEMISTRY; VITRINITE; ORGANIC geochemistry
- Publication
Natural Gas Geoscience, 2023, Vol 34, Issue 5, p821
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2022.12.013