Gas sources of the yn2 gas pool in the tarim basin- evidence from gas generation and methane carbon isotope fractionation kinetics of source rocks and crude oils
文献类型：期刊论文
| 作者 | Tian, H.; Xiao, X. M.; Wilkins, R. W. T.; Li, X. Q.; Gan, H. J. |
| 刊名 | Marine and petroleum geology
 |
| 出版日期 | 2007 |
| 卷号 | 24期号:1页码:29-41 |
| ISSN号 | 0264-8172 |
| 关键词 | Tarim basin Yn2 gas pool Natural gas source Methane carbon isotope Kinetic modeling |
| DOI | 10.1016/j.marpetgeo.2006.10.001 |
| 通讯作者 | Xiao, x. m.(xmxiao@gig.ac.cn) |
| 英文摘要 | The yn2 gas pool in the eastern tarim basin has been believed to be an accumulation of gases resulting from oil-cracking. however, this gas source model cannot explain such geochemical characteristics of the natural gases as heavier carbon isotope values (delta(13)c(1) = -37.5 parts per thousand to -36.2 parts per thousand; delta(13)c(2) = -34.7 parts per thousand to -30.9 parts per thousand) and high content of nitrogen gas (15.5% on average). in this study, we performed pyrolysis experiments on typical source rock and crude oil samples selected from the basin, evaluated their kinetic parameters of gas generation and methane carbon isotopic fractionation, and extrapolated them to geological conditions. the results show that neither kerogen-cracking gas nor oil-cracking gas can act as the single gas source of the yn2 gas pool. by contrast, a mixing model of 55% kerogen-cracking gas and 45% oil-cracking gas results in an excellent match with the geochemical characteristics of the gas pool. the gas condensate from the yn2 gas pool originated from the cracking of oils in mid-upper ordovician strata, and the nitrogen gas was mainly derived from the cracking of kerogen in cambrian-lower ordovician mudstones in the yingjisu depression center during the very high level of maturation. the yn2 gas pool went through three stages of formation: (1) oils from cambrian-lower ordovician source rocks accumulated in cambrian and ordovician reservoirs during the middle ordovician, and gases were generated from both kerogen and paleo-oil pools in the cambrian-lower ordovician strata during late ordovician to early devonian; (2) gases leaked during either late devonian to triassic due to uplifting, or late jurassic due to intense faulting activity in this area; (3) gases were regenerated from the late cracking of kerogen in the cambrian-lower ordovician strata as well as from oil-cracking in mid-upper ordovician reservoirs with rapid subsidence after the cretaceous. the two types of gas mixed and accumulated in the jurassic traps to form the present wet gas pool with high nitrogen content and a heavier methane carbon isotopic value. (c) 2006 elsevier ltd. all rights reserved. |
| WOS关键词 | NATURAL-GAS ; SYSTEM PYROLYSIS ; COAL ; CRACKING ; RATIOS ; CONVERSION ; MARINE ; CHINA ; FIELD |
| WOS研究方向 | Geology |
| WOS类目 | Geosciences, Multidisciplinary |
| 语种 | 英语 |
| 出版者 | ELSEVIER SCI LTD |
| WOS记录号 | WOS:000244599300003 |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2383913 |
| 专题 | 中国科学院大学 |
| 通讯作者 | Xiao, X. M. |
| 作者单位 | 1.Chinese Acad Sci, State Key lab Organ Geochem, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China 3.CSIRO, N Ryde, NSW 2113, Australia 4.China Univ Min & Technol, Key Lab Coal Resources, Minist Educ, Beijing 100083, Peoples R China |
| 推荐引用方式 GB/T 7714 | Tian, H.,Xiao, X. M.,Wilkins, R. W. T.,et al. Gas sources of the yn2 gas pool in the tarim basin- evidence from gas generation and methane carbon isotope fractionation kinetics of source rocks and crude oils[J]. Marine and petroleum geology,2007,24(1):29-41. |
| APA | Tian, H.,Xiao, X. M.,Wilkins, R. W. T.,Li, X. Q.,&Gan, H. J..(2007).Gas sources of the yn2 gas pool in the tarim basin- evidence from gas generation and methane carbon isotope fractionation kinetics of source rocks and crude oils.Marine and petroleum geology,24(1),29-41. |
| MLA | Tian, H.,et al."Gas sources of the yn2 gas pool in the tarim basin- evidence from gas generation and methane carbon isotope fractionation kinetics of source rocks and crude oils".Marine and petroleum geology 24.1(2007):29-41. |
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来源：中国科学院大学
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