| Generation and accumulation of Quaternary shallow gas in eastern Qaidam Basin, NW China |
| |
| 作者姓名： | 苏爱国 赵文智 党玉琪 张水昌 黎茂稳 庞雄奇 周瑞年 管自强 徐子远 张道伟 谭彦虎 陈践发 李素梅 |
| |
| 作者单位： | [1]China University of Mining ＆ Technology （Beijing）, Beijing 100083, China [2]PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China [3]PetroChina Qinghai Oilfield Company, Denghuang 736202, China [4]Geological Survey of Canada, Calgary, T2L 2A7, Canada [5]China University of Petroleum （Beijing）, Beijing 102249, China |
| |
| 基金项目： | 科技部科研项目，National Key Scientific Program，the ESS Global Opportunities Program |
| |
| 摘 要： | 1INTRODUCTION SHALLOW(MOSTLYBIOGENIC)GASACCOUNTSFOROVER20%OFTHEWORLD’SDISCOVEREDGASRESERVES(RICEAND CLAYPOOL,1981;CLAYPOOLANDKAPLAN,1974),AND REPRESENTSONEOFTHEUNCONVENTIONALENERGYSOURCES THATINCREASINGLYATTRACTTHEATTENTIONOFPETROLEUMGEOL OGISTS.NUMEROUS…
|
| 关 键 词： | 第四纪 天然气 地质条件 中国 地球化学 更新世 |
Generation and accumulation of Quaternary shallow gas in eastern Qaidam Basin, NW China |
| |
| Aiguo Su,Wenzhi Zhao,Yuqi Dang,Shuichang Zhang,Maowen Li,Xiongqi Pang,Ruilian Zhou,Ziqiang Guan,Ziyuan Xu,Daowei Zhang,Yanhu Tan,Jianfa Chen,Sumei Li.Generation and accumulation of Quaternary shallow gas in eastern Qaidam Basin, NW China[J].Chinese Journal of Geochemistry,2006,25(1):43-55. |
| |
| Authors: | Aiguo Su Wenzhi Zhao Yuqi Dang Shuichang Zhang Maowen Li Xiongqi Pang Ruilian Zhou Ziqiang Guan Ziyuan Xu Daowei Zhang Yanhu Tan Jianfa Chen Sumei Li |
| |
| Institution: | (1) China University of Mining & Technology (Beijing), 100083 Beijing, China;(2) PetroChina Research Institute of Petroleum Exploration and Development, 100083 Beijing, China;(3) PetroChina Qinghai Oilfield Company, 736202 Denghuang, China;(4) Geological Survey of Canada, T2L 2A7 Calgary, Canada;(5) China University of Petroleum (Beijing), 102249 Beijing, China |
| |
| Abstract: | This study presents an overview on the geological setting and geochemical characteristics of Pleistocene shallow gas accumulations
in eastern Qaidam Basin, NW China. Five largest gas accumulations discovered in this region have a combined enclosure area
of about 87 km2 and 7.9 trillion cubic feet (tcf) of proven plus controlled gas reserves. The dominance of methane (>99.9%) and the δ13C and δD values of methane (−68.51‰ to −65.00‰ and −227.55‰ to −221.94‰, respectively) suggest that these gases are biogenic,
derived from the degradation of sedimentary organic matter by methanogens under relatively low temperatures (<75°C). A sufficient
supply and adequate preservation of organic matter in the Pleistocene sediments is made possible by the lake basin’s high
altitude (2600–3000 m), high water salinity (>15%) and strong stratification. The deposition and extensive lateral occurrence
of shore and shallow lake sands/silts in beach sand sheets and small bars provided excellent reservoirs for the biogenic gas
generated from adjacent rocks. Effective but dynamic gas seals were provided by such factors as intermittent vertical variations
in the sediment lithologies, hydraulic trapping due to mudstone water saturation, the hydrocarbon gradient created as a result
of gas generation from potential caprocks, and the presence of a regional caprock consisting of 400–800-m-thick mudstones
and evaporites. It appears that the most favorable traps for large gas accumulations occur on structural slopes near the major
gas kitchen, and the prolific gas pools are often those large gentle anticlines with little faulting complication.
This study was funded by the China 973 Key Foundation Research Development Project (Grant No. 2001 CB209100), National Key
Scientific Program (Grant No. 96-111-01-03) and the ESS Global Opportunities Program. |
| |
| Keywords: | biogenic gas generation accumulation Quaternary Qaidam Basin |
| 本文献已被 CNKI 维普 万方数据 SpringerLink 等数据库收录！ |
|
