松辽盆地湖相烃源岩中生物标志物的单体烃碳同位素组成特征及其意义
The carbon isotopic composition of individual biomarkers in lacustrine source rocks from Songliao Basin and its biogeochemical implication
查看参考文献36篇
|
文摘
|
本研究对松科一井嫩江组一和二段(K_2n~1和K_2n~2)岩芯样品进行了有机碳稳定同位素和单体烃分子碳同位素分析,结合其他地球化学参数探讨了沉积环境与母质生物之间的关系。正构烷烃碳同位素在-35.7‰~-28.7‰之间变化,显示了各链长正构烷烃具有不同的母质生源。其中,中链正构烷烃(MCA)碳同位素明显贫~(13)C,偏轻达5‰,可能与其先体母质部分地利用了有机质降解的贫~(13)C的CO_2有关。嫩江组藿烷碳同位素(δ~(13)C_(hopane))处于-32.00‰~ -68.65‰之间,在嫩一段下部的δ~(13)C_(hopane)偏轻达到-68.65‰,表明该时期存在甲烷营养菌。在嫩一段δ~(13)C_(Ga)较重、δ~(13)C_(hopane)显著偏轻的层段与水体分层、间歇性透光带缺氧相对应,反映了该时期的化跃层界面较浅,缺氧层上升到了透光带,这种极端的水体环境有利于沉积有机质的保存,造成了该层段高TOC、高HI的富有机质烃源岩的形成;而在嫩二段伽马蜡烷缺失、δ~(13)C_(hopane)较重时,则反映了水体的化跃层界面较深,环境相对较为氧化,有机质保存条件变差,导致了该段TOC和HI相对较低。由此可见,水体化跃层界面的深浅不仅控制了湖泊沉积有机质的丰度,还影响了水体中微生物的发育,在化跃层较浅的层段,嗜甲烷菌、化学自养菌发育,而在化跃层较深的层段,水体中以化学自养菌为主。另外,δ~(13)C_(Ga)和δ~(13)C_(4-甲基兹烷)与水体盐度呈正相关关系,水体盐度越高,其碳同位素值越重。 |
|
其他语种文摘
|
Stable carbon isotopic compositions (δ~(13)C) of organic matter and molecular hydrocarbon biomarkers in the first and second members of Nenjiang Formation (K_2n~1 and K_2n~2) from the SK-1 drilling well are studies, and combined with other geochemical parameters, aimed to investigate the relationship between depositional paleoenvironment and initial organisms of organic matter. The n-alkanes show a wide range of carbon isotopic values, varying from -35.7‰ to -28.7‰,indicating that the n-alkanes with different carbon chain lengths may have different sources. For example, the medium-chain n-alkanes are significantly depleted in ~(13)C and more negative (ca. 5‰) than short-chain and long-chain n-alkanes, which are probably due to its original organism partly utilized the ~(13)C-depleted CO_2 from degradation of organic matter. The δ~(13)C values of hopanes vary from -32.00‰ to -68.65‰,with the lightest value (ca. -68.65‰)in the lower part of K_2n~1,suggesting a predominant origin of methanotrophic bacteria. Isotopically heavier gammacerance and significantly lighter hopanes in K_2n~1, coincide with water stratification and intermittently anoxic photic zone, which represent a shallow chemocline. The extreme water environment, anoxia spreading upward to euphotic zone, is conducive to the preservation of organic matter, resulting in high values of TOC and HI in this section. By contrast, absence of gammacerane and isotopically heavier hopanes in K_2n~1 reflect the deeper chemocline, corresponding to a relatively oxic environment and low values of TOC and HI. Thus, the depth of water chemocline can not only control the abundance of organic matter in lacustrine sediments, but also affect the growth of microbial community. Chemoautotrophic bacteria are dominant in the water body with a deeper chemocline while chemoautotrophic bacteria and methanetrophic bacteria develop in the shallower chemocline. Moreover, δ~(13)C values of gammacerance and 4-methylsteranes are related to water salinity, i.e., the higher the water salinity is, the isotopically heavier gammacerance and 4-methylsterane would be produced. |
|
来源
|
地球化学
,2015,44(4):337-347 【核心库】
|
|
关键词
|
分子碳同位素
;
化跃层
;
古水体环境
;
松科一井
|
|
地址
|
1.
中国科学院广州地球化学研究所, 有机地球化学国家重点实验室, 广东, 广州, 510640
2.
中国石油化工股份有限公司河南油田分公司勘探开发研究院, 河南, 郑州, 450018
|
|
语种
|
中文 |
|
文献类型
|
研究性论文 |
|
ISSN
|
0379-1726 |
|
学科
|
地质学 |
|
基金
|
国家自然科学基金
|
|
文献收藏号
|
CSCD:5471292
|
参考文献 共
36
共2页
|
|
1.
Scott R W. Late Cretaceous chronostratigraphy (Turonian-Maastrichtian): SK1 core Songliao Basin, China.
Geosci Front,2012,3(4):357-367
|
CSCD被引
14
次
|
|
|
|
|
2.
Bechtel A. Palaeoenvironmental conditions during deposition of the Upper Cretaceous oil shale sequences in the Songliao Basin (NE China): Implications from geochemical analysis.
Org Geochem,2012,46:76-95
|
CSCD被引
46
次
|
|
|
|
|
3.
Hou D. Marine transgressional events in the gigantic freshwater lake Songliao: Paleontological and geochemical evidence.
Org Geochem,2000,31(7):763-768
|
CSCD被引
26
次
|
|
|
|
|
4.
Xi D. Discovery of Late Cretaceous foraminifera in the Songliao Basin: evidence from SK-1 and implications for identifying seawater incursions.
Chinese Sci Bull,2011,56(3):253-256
|
CSCD被引
17
次
|
|
|
|
|
5.
Wang C S. Cretaceous paleogeography and paleoclimate and the setting of SKI borehole sites in Songliao Basin, northeast China.
Palaeogeogr Palaeoclimatol Palaeoecol,2013,385:17-30
|
CSCD被引
78
次
|
|
|
|
|
6.
Chamberlain C P. Stable isotopic evidence for climate and basin evolution of the Late Cretaceous Songliao basin, China.
Palaeogeogr Palaeoclimatol Palaeoecol,2013,385:106-124
|
CSCD被引
29
次
|
|
|
|
|
7.
黄清华. 松辽盆地晚白垩世生物演化与古湖泊缺氧事件.
微体古生物学报,1998,15(4):417-425
|
CSCD被引
25
次
|
|
|
|
|
8.
Song Z. A biomarker study of depositional paleoenvironments and source inputs for the massive formation of Upper Cretaceous lacustrine source rocks in the Songliao Basin, China.
Palaeogeogr Palaeoclimatol Palaeoecol,2013,385:137-151
|
CSCD被引
16
次
|
|
|
|
|
9.
Wang L. Paleosalinity significance of occurrence and distribution of methyltrimethyltridecyl chromans in the Upper Cretaceous Nenjiang Formation, Songliao Basin, China.
Org Geochem,2011,42(11):1411-1419
|
CSCD被引
9
次
|
|
|
|
|
10.
万晓樵. 松辽盆地白至纪青山口阶的同位素地层标志及其与海相Cenomanian阶的对比.
地质学报,2005,79(2):150-156
|
CSCD被引
20
次
|
|
|
|
|
11.
Zhang W. Long-term variations of CO_2 trapped in different mechanisms in deep saline formations: A case study of the Songliao Basin, China.
Int J Greenh Gas Contr,2009,3(2):161-180
|
CSCD被引
18
次
|
|
|
|
|
12.
Bechtel A. Facies evolution and stratigraphic correlation in the early Oligocene Tard Clay of Hungary as revealed by maceral, biomarker and stable isotope composition.
Mar Pet Geol,2012,35(1):55-74
|
CSCD被引
2
次
|
|
|
|
|
13.
Sachse D. Molecular paleohydrology: Interpreting the hydrogen-isotopic composition of lipid biomarkers from photosynthesizing organisms.
Ann Rev Earth Planet Sci,2012,40:221-249
|
CSCD被引
55
次
|
|
|
|
|
14.
Luo G. Shallow stratification prevailed for 1700 to 1300 Ma ocean: Evidence from organic carbon isotopes in the North China Craton.
Earth Planet Sci Lett,2014,400:219-232
|
CSCD被引
27
次
|
|
|
|
|
15.
Feng Z. Tectonostratigraphic units and stratigraphic sequences of the nonmarine Songliao basin, northeast China.
Basin Res,2010,22(1):79-95
|
CSCD被引
146
次
|
|
|
|
|
16.
Ficken K J. An n-alkane proxy for the sedimentary input of submerged/floating freshwater aquatic macrophytes.
Org Geochem,2000,31(7):745-749
|
CSCD被引
197
次
|
|
|
|
|
17.
Mead R. Sediment and soil organic matter source assessment as revealed by the molecular distribution and carbon isotopic composition of n-alkanes.
Org Geochem,2005,36(3):363-370
|
CSCD被引
29
次
|
|
|
|
|
18.
Hayes J M. Factors controlling ~(13)C contents of sedimentary organic compounds: Principles and evidence.
Mar Geol,1993,113(1):111-125
|
CSCD被引
58
次
|
|
|
|
|
19.
Schouten S. Biosynthetic effects on the stable carbon isotopic compositions of algal lipids: Implications for deciphering the carbon isotopic biomarker record.
Geochim Cosmochim Acta,1998,62(8):1397-1406
|
CSCD被引
15
次
|
|
|
|
|
20.
Schouten S. Effects of an oceanic anoxic event on the stable carbon isotopic composition of early Toarcian carbon.
Am J Sci,2000,300(1):1-22
|
CSCD被引
3
次
|
|
|
|
|
了解气象卫星更多信息，请访问