Geobiological processes of the formation of lacustrine source rock in Paleogene
Geobiological processes of the formation of lacustrine source rock in Paleogene
复制标题
古近纪湖相烃源岩形成的地球生物学过程
DOI：
10.1007/s11430-013-4753-8
复制
发表时间：
2014-04
期刊：
影响因子：
--
通讯作者：
Xu Xingyou
中科院分区：
文献类型：
--
作者：
Liao Wei;Song Guoqi;Wang Xuejun;Xu Xingyou
山东东营凹陷古近系沙河街组下部广泛发育膏盐岩和球岩质钙质页岩。石膏盐岩形成于盐湖较早的沉积阶段，而上覆的岩芯页岩则形成于盐度较低的盐湖中。通过对古湖泊环境和湖泊微生物群落的比较，认为蓝藻是膏盐地层系列形成过程中生产力的主要代表，其年生产力为1500 ~ 2000 gC m−2yr−1。通过对钙质页岩超微化石的研究，认为球粒岩是钙质页岩形成过程中产能的主要贡献者。根据沉积速率、页岩层理和各层理中球粒岩化石的统计资料，计算了生产力的定量值，年生产力为2250 ~ 3810 gC m−2yr−1（平均3120 gC m−2yr−1）。大量黄铁矿树状体的统计数据表明，在膏盐地层系列沉积期间，下部水柱长期处于硫化物或缺氧状态，而在球岩质钙质页岩沉积时，下部水柱变为欠氧状态。这两种水条件都有利于有机物的保存。利用多参数地球生物学模型对东营凹陷下古近系盐湖和盐湖的有机碳埋藏效率进行了计算和分析，估计有机碳埋藏效率约为10% ~ 15%。
Gypsum-salt rocks and coccolith calcareous shale are widely deposited in the lower part of the Paleogene Shahejie Formation in the Dongying Sag, Shandong Province. The gypsum-salt rock is believed to be formed during the earlier deposition in salt lake, while the overlying coccolith shale in saline lake with relatively low salinity. By comparing the lake environment and lacustrine microbial communities between ancient and recent lakes, cyanobacteria are regarded as the main representative of productivity during the formation of gypsum-salt strata series, with the annual productivity of 1500–2000 gC m−2yr−1. Based on the research of ultramicrofossils in the calcareous shale, coccolith is considered as the main contributor to the productivity during the formation of calcareous shale. On the basis of statistic data of sedimentary rates, shale laminations, and coccolith fossils in each lamination, the quantitative value of productivity is calculated, with the annual productivity of 2250–3810 gC m−2yr−1(averagely 3120 gC m−2yr−1). Statistic data of large amount of pyrite framboids indicate that the lower water column was persistently in sulfidic or anoxic conditions during the deposition of gypsum-salt strata series, but it changed to be dysoxic when the coccolith calcareous shale was deposited. Both of these water conditions are favorable for the preservation of organic matter. It is estimated that the organic carbon burial efficiency of the Lower Paleogene salt lakes and saline lakes of Dongying Depression is about 10%–15%, which is calculated and analyzed using the multi-parameter geobiological model.
登录
查看更多内容
影响因子：
2.8
作者：
D. Holliday;Pieper;Greenlaw;Dawson
通讯作者：
D. Holliday;Pieper;Greenlaw;Dawson
DOI：
10.1016/0198-0149(90)90103-3
发表时间：
1990-06
期刊：
--
影响因子：
--
作者：
B. Hay;S. Honjo;S. Kempe;V. Ittekkot;E. Degens;Tosun Konuk;E. Izdar
通讯作者：
B. Hay;S. Honjo;S. Kempe;V. Ittekkot;E. Degens;Tosun Konuk;E. Izdar
影响因子：
18.3
作者：
Gingras, Murray;Hagadorn, James W.;Konhauser, Kurt O.
通讯作者：
Konhauser, Kurt O.
影响因子：
4.5
作者：
S. Sobek;E. Durisch-Kaiser;R. Zurbrügg;Nuttakan Wongfun;Martin Wessels;Natacha Pasche;B. Wehrli
通讯作者：
S. Sobek;E. Durisch-Kaiser;R. Zurbrügg;Nuttakan Wongfun;Martin Wessels;Natacha Pasche;B. Wehrli
DOI：
--
发表时间：
2003
期刊：
Journal of the University of Petroleum,China
影响因子：
--
作者：
Zhu Guang
通讯作者：
Zhu Guang