We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
天然气中丁烷地球化学特征及应用.
- Authors
王鹏; 沈忠民; 何崇康; 王君泽; 黄飞; 潘树林; 尹帅
- Abstract
Based on comprehensive analysis of internal factors (i.e., organic matter type and organic matter maturity) and external factor (i.e., biodegradation and migration) on characteristics of butane, the application of geochemical characteristics of butane was studied. The paper cleared the effects of internal factors on characteristics of butane. The coal type gas derived from humic organic matters, which had the higher iC4/nC4 ratio and δ13C4 value than the oil type gas from sapropellic organic matters. The iC4/nC4 ratio decreased with the increase of maturity, and it decreased quickly at the mature stage and slowly at the high-mature stage. The iC4/nC4 ratio would increase as the biodegradation increases, and the stronger the biodegradation,the higher the iC4/nC4 ratio.Whether the migration would affect the iC4/nC4 ratio and how it affects, both are uncertain. It is found that the butane can provide information about the biodegradation, genesis and maturity of natural gas. The iC4/nC4 ratio can be used to effectively determine the gas is biodegraded or normal. The iC4/nC4 ratios of biodegraded gas were higher than 2 and most of them were higher than 3. If the iC4/nC4 ratio is higher than 3, the natural gas is biodegraded gas. The iC4/nC4 ratios of normal gas were lower than 3 and most of them were lower than 3, if the iC4/nC4 ratio is lower than 2, the natural gas is normal gas. For the gas suffered less influence by external factor, the oil type which has iC4/nC4 ratios lower than 0.8 and δ13C4 value lower than -26‰, the coal type gas which has iC4/nC4 ratios higher than 0.8 and δ13C4 value higher than -26‰. The iC4/nC4 ratios can help analyze the maturity of natural gas. For the iC4/nC4 as trace index, there are still more controversial and poor effectiveness,and should be carefully to choose it for tracing migration.
- Publication
Natural Gas Geoscience, 2017, Vol 28, Issue 4, p529
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2017.01.014