کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4699104 1637632 2013 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Controls on biogenic gas formation in the Qaidam Basin, northwestern China
ترجمه فارسی عنوان
کنترل شکل گیری گاز بیوگرافی در حوضه قیدم، شمال غربی چین
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات ژئوشیمی و پترولوژی
چکیده انگلیسی

Factors controlling biogenic gas generation were examined in the Quaternary Qaidam Basin of China, one of the youngest and largest biogenic gas-producing basins in the world. Indicators of microbial activity were found in higher permeability stratigraphic intervals, including high ratios of unresolved complex mixture/resolved compounds (U/R), as well as high ratios of methanogen biomarkers to normal alkanes, such as 2,6,10,14,19-pentamethylicosane/nC22 (ipC25/nC22) and squalane/nC26 (ipC30/nC26), from solvent organic extracts from 86 samples. Samples with the highest concentrations of ipC25/nC22 and ipC30/nC26 were the most highly biodegraded as shown by U/R ratios. Most intervals with high levels of methanogen biomarkers were characterized by groundwater with low total dissolved solids (TDS) and low Cl concentrations, thought to be related to meteoric water recharge. High H2 concentrations were also related to low TDS (and Cl) formation water. Results demonstrate that meteoric water invasion was important in stimulating microbial activity.


► Ratios of ipC25/nC22, ipC30/nC26, and U/R are used to examine controls on microbial activity in the Qaidam Basin, China.
► Levels of microbial methanogenesis vary greatly in different stratigraphic units.
► High microbial activity is consistent with low Cl formation water.
► Microbes thrive in hydrogeologic regimes where saline waters have been flushed by freshwater recharge.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Geology - Volume 335, 6 January 2013, Pages 36–47
نویسندگان
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