2005/01/01 by Yufu Han, Yuanjia Han, Li Wang +6
Chemistry · Computer Science · Engineering · #Advanced Wireless Network Optimization #Distributed and Parallel Computing Systems #Enhanced Oil Recovery Techniques #Hydrocarbon exploration and reservoir analysis #Petroleum Processing and Analysis #Wireless Communication Networks Research
paper · doi:10.1021/jasms.4c00403
openalex publication_date 2005/01/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/06/24
Hydrothermal fluid plays a crucial role in the generation and migration of hydrocarbons within sedimentary basins. Herein, we employed bulk analysis and high-resolution mass spectrometry techniques to investigate the transformation dynamics from source rock to hydrocarbons under conditions influenced by magmatic activities in the Kongdian Formation, Huanghua Depression, China. The results revealed that hydrocarbon generation in the Ek<sub>2</sub> shale of the study area was significantly influenced by abnormal heating from hydrothermal fluids. High temperatures associated with these fluids accelerated the conversion of organic matter within source rocks, enhancing hydrocarbon generation rates. Subsequently, the hydrocarbons migrated into fracture networks, where they solidified as low-reflectance solid bitumen, forming trapped fractures of pyrobitumen and authigenic mineral aggregates leached from thermal fluid. High aliphatic fractions were noted in the source rock extracts, while extracts from low-reflectance solid bitumen exhibited higher aromatic fraction. Aliphatic and aromatic compounds in extracts from both the low-reflectance solid bitumen and the source rock exhibited similar maturities and origins. Regarding polar compounds, the compound classes O<sub>1</sub>, O<sub>2</sub>, N<sub>1</sub>O<sub>1</sub>, and N<sub>1</sub>O<sub>2</sub> showed higher abundances in source rock extracts compared to those in low-reflectance solid bitumen, while the S<sub>1</sub> and N<sub>1</sub> classes showed the opposite trend. Thus, fractionation clearly occurs when hydrocarbons expelled from source rocks by thermal fluids solidify into low-reflectance solid bitumen. This unique study provides valuable insights into understanding the fate of hydrocarbons originating from source rocks heated by thermal fluids, and explores the potential for unconventional oil in regions with intense hydrothermal alteration.