To understand the influence of the diagenetic water medium on the isotopic compositions of thermogenic coalbed gas, both hydrous and anhydrous closed-system pyrolyses were performed at temperatures of 250°C to 65...To understand the influence of the diagenetic water medium on the isotopic compositions of thermogenic coalbed gas, both hydrous and anhydrous closed-system pyrolyses were performed at temperatures of 250°C to 650°C on an herbaceous marsh peat. Compared to the results of anhydrous pyrolysis, the hydrocarbon gases generated from hydrous pyrolyses have very different hydrogen isotopic compositions. However, the carbon isotopic compositions of the hydrocarbon gases became only slightly heavier in hydrous pyrolysis, compared to that from anhydrous pyrolysis. With the progress of thermal evolution from peat to a more advanced thermal maturity of vitrinite reflectance values（Ro） of 5.5% during the pyrolysis, the difference in the average δD value increased from 52‰ to 64‰ between the hydrous pyrolysis with saltwater and anhydrous pyrolysis and increased from 18‰ to 29‰ between the hydrous pyrolysis with freshwater and anhydrous pyrolysis, respectively. The difference in the average δ^（13）C value was only 1‰–2‰ between the hydrous and anhydrous pyrolysis. The relationships between the δD values of the generated hydrocarbon gases and Ro values as well as among δD values of the hydrocarbon gas species are established. The close relationships among these parameters suggest that the water medium had a significant effect on the hydrogen isotopic composition and a minimal effect on the carbon isotopic composition of the hydrocarbon gases. The results of these pyrolyses may provide information for the understanding of the genesis of coalbed gas from herbaceous marsh material with the participation of different diagenetic water media.展开更多
INTRODUCTION OF WU XIANZHONG Academician Wu Xianzhong (born on August 28th,1925) graduated from Shenyang Medical College in 1948.In 1959,he participated in the traditional Chinese medicine (TCM) courses held by Tianji...INTRODUCTION OF WU XIANZHONG Academician Wu Xianzhong (born on August 28th,1925) graduated from Shenyang Medical College in 1948.In 1959,he participated in the traditional Chinese medicine (TCM) courses held by Tianjin University of Traditional Chinese Medicine for doctors of western medicine.In 1961,he graduated and was awarded the golden medal by National Health Commission.He has been specialized in surgery of integrated Chinese and western medicine since the early 1960s and works as one of the pioneers in the field of integrated Chinese and western medicine in China.He established Tianjin Hospital of Integrated Traditional Chinese and Western Medicine and the Institute of Acute Abdominal Diseases in Integrated Chinese and Western Medicine.From 1964 to 1977,he served as Director of Nankai Hospital.From 1978 to 1994,he served as Deputy Director,Director and Honorary President of Tianjin Medical College (known as Tianjin Medical University nowadays).展开更多
基金supported by the National Natural Science Foundation of China(Grant nos.41772108 and 41472121)
文摘To understand the influence of the diagenetic water medium on the isotopic compositions of thermogenic coalbed gas, both hydrous and anhydrous closed-system pyrolyses were performed at temperatures of 250°C to 650°C on an herbaceous marsh peat. Compared to the results of anhydrous pyrolysis, the hydrocarbon gases generated from hydrous pyrolyses have very different hydrogen isotopic compositions. However, the carbon isotopic compositions of the hydrocarbon gases became only slightly heavier in hydrous pyrolysis, compared to that from anhydrous pyrolysis. With the progress of thermal evolution from peat to a more advanced thermal maturity of vitrinite reflectance values（Ro） of 5.5% during the pyrolysis, the difference in the average δD value increased from 52‰ to 64‰ between the hydrous pyrolysis with saltwater and anhydrous pyrolysis and increased from 18‰ to 29‰ between the hydrous pyrolysis with freshwater and anhydrous pyrolysis, respectively. The difference in the average δ^（13）C value was only 1‰–2‰ between the hydrous and anhydrous pyrolysis. The relationships between the δD values of the generated hydrocarbon gases and Ro values as well as among δD values of the hydrocarbon gas species are established. The close relationships among these parameters suggest that the water medium had a significant effect on the hydrogen isotopic composition and a minimal effect on the carbon isotopic composition of the hydrocarbon gases. The results of these pyrolyses may provide information for the understanding of the genesis of coalbed gas from herbaceous marsh material with the participation of different diagenetic water media.
文摘INTRODUCTION OF WU XIANZHONG Academician Wu Xianzhong (born on August 28th,1925) graduated from Shenyang Medical College in 1948.In 1959,he participated in the traditional Chinese medicine (TCM) courses held by Tianjin University of Traditional Chinese Medicine for doctors of western medicine.In 1961,he graduated and was awarded the golden medal by National Health Commission.He has been specialized in surgery of integrated Chinese and western medicine since the early 1960s and works as one of the pioneers in the field of integrated Chinese and western medicine in China.He established Tianjin Hospital of Integrated Traditional Chinese and Western Medicine and the Institute of Acute Abdominal Diseases in Integrated Chinese and Western Medicine.From 1964 to 1977,he served as Director of Nankai Hospital.From 1978 to 1994,he served as Deputy Director,Director and Honorary President of Tianjin Medical College (known as Tianjin Medical University nowadays).
