Origin and formation pathways of kerogen-like organic matter in recent sediments off the Danube delta (northwestern Black Sea)   总被引：1，自引：0，他引：1  

Anouk Garcette-Lepecq  Sylvie Derenne  Claude Largeau  Ioanna Bouloubassi  Alain Saliot 《Organic Geochemistry》2000,31(12):204

The chemical structure, source(s), and formation pathway(s) of kerogen-like organic matter (KL) were investigated in recent sediments from the northwestern Black Sea, off the Danube delta. Three sections from a sediment core collected at the mouth of the Sulina branch of the delta, under an oxic water column, were examined: S₀ (0–0.5 cm bsf), S₁₀ (10–13 cm bsf), and S₂₀ (20–25 cm bsf). The bulk geochemical features of these sediments (total organic carbon, organic C/N atomic ratio, δ¹³C_org) were determined. Thereafter, KL was isolated from the samples, as the insoluble residue obtained after HF/HCl treatment. KL chemical composition was investigated via spectroscopic (FTIR, solid state ¹³C and ¹⁵N NMR) and pyrolytic (Curie point pyrolysis–gas chromatography–mass spectrometry) methods, and the morphological features were examined by scanning and transmission electron microscopy. Similar morphological features and chemical composition were observed for the three KLs and they suggested that the selective preservation of land-plant derived material as well as of resistant aliphatic biomacromolecules (probably derived from cell walls of freshwater microalgae) was the main process involved in KL formation. Besides, some melanoidin-type macromolecules (formed via the degradation-recondensation of products mainly derived from proteinaceous material) and/or some encapsulated proteins also contributed to the KL chemical structure.  相似文献   

LC电路状态轨线的一种画法     

饶瑞昌  符五久 《华东地质学院学报》1998,(4)

本文介绍了一种画ＬＣ电路相轨线的方法,运用该方法画了几个ＬＣ电路的相轨线,从而表明该方法对ＬＣ电路的分析有实用价值。  相似文献   

云南金顶铅锌矿床成矿溶液运移通道的古水文地质分析   总被引：4，自引：0，他引：4  

孙勇  许绍倬 《地球科学》1989,14(5):489-494

  相似文献   

亚洲夏季风是低层污染物进入平流层的重要途径   总被引：10，自引：4，他引：6       下载免费PDF全文

卞建春  严仁嫦  陈洪滨 《大气科学》2011,35(5):897-902

夏季亚洲季风区是对流层低层水汽和污染物进入全球平流层的一个重要通道, 自然或人为污染物通过该通道进入平流层后对臭氧层的破坏以及全球气候环境的影响, 成为目前国际科学界关注的热点问题。早先观点认为: 夏季青藏高原是对流层低空物质向平流层输送的一个重要渠道。然而, 越来越多的观测表明: 包括青藏高原在内的整个亚洲夏季风通过强对流的快速输送以及大尺度输送过程可以把低层大气物质输送到全球平流层。在地面物质进入平流层的过程中有两个关键过程, 一是垂直快速输送的对流活动, 这对于短寿命化学成分非常重要, 二是缓慢的大尺度反气旋输送和限制作用。但是, 目前对于亚洲季风区不同源区的贡献还有很大的争议。  相似文献   

番禺低隆起—白云凹陷北坡第三系储层次生孔隙形成机理分析   总被引：1，自引：1，他引：0  

郝乐伟  王琪  廖朋  唐俊  张功成 《沉积学报》2011,29(4):734-743

根据砂岩薄片、铸体薄片、扫描电镜的分析,研究区内发育大量的粒间和粒内溶蚀孔。在大量实测物性参数统计分析的基础上,发现了白云凹陷第三系储层存在两个次生孔隙发育带,主要分布在2 750～3 500 m和4 100～4 600 m两个深度段。通过同位素示踪的方法,证实了形成次生孔隙的原因主要是有机质成熟时释放的有机酸和成岩过...  相似文献   

青藏高原及其邻近区域穿越对流层顶质量通量的时空演变特征   总被引：15，自引：6，他引：9  

樊雯璇  王卫国  卞建春 《大气科学》2008,32(6):1309-1318

利用1958~2001年ECMWF资料, 根据Wei公式估算了青藏高原及其邻近区域穿越对流层顶的质量通量 (CTF), 分析了CTF的时空分布特征。分析结果表明: (1) CTF分布呈现纬向型, 在副热带西风急流北侧即对流层顶断裂带中存在东西向的TST (对流层向平流层输送)[CD*2]STT (平流层向对流层输送)[CD*2]TST的波列结构 (水平输送项决定), 而南侧分布决定于垂直输送项。 (2) 在80°E~105°E范围内, 冬春季节, 青藏高原南部及其以南区域为TST, 北部为STT; 夏秋季节, 整个区域几乎由TST所控制。西风急流南侧的CTF主要决定于垂直项, 而北侧主要决定于水平项, 再往北, 垂直项与水平项贡献相当。 (3) 青藏高原与孟加拉湾区域平均CTF在所有季节均为TST, 即有从对流层到平流层净的向上输送, 2月强度最大, 7月为另一个极大值; 两个极大值有不同的产生机制, 后者决定于垂直项, 而前者由水平项决定。 (4) 青藏高原 (及孟加拉湾) 区域年平均CTF在1958~2001年之间的变化趋势在1982年左右出现一个转折: 1982年之前, CTF为递减过程; 而之后CTF为相对较强的增长。上述结果表明: 尽管冬季高原上空为下沉气流, 但高原上空的水平输送项有很强的向上贡献, 这与丛春华等 (2003) 得出的STT不一致。但需要指出的是, 根据Wei公式计算的CTF, 〖JP2〗尤其在急流附近, 对资料中存在的误差十分敏感 (Gettleman等, 2000), 因此青藏高原主体上空在冬季是STT还是TST, 有待于进一步的分析研究。  相似文献   

Accumulation Mechanisms and Evolution History of the Giant Puguang Gas Field, Sichuan Basin, China     

HAO Fang  GUO Tonglou  DU Chunguo  ZOU Huayao  CAI Xunyu  ZHU Yangming  LI Pingping  WANG Chunwu  ZHANG Yuanchun 《《地质学报》英文版》2009,83(1)

Solid bitumens were found throughout the carbonate reservoirs in the Puguang gas field,the largest gas field SO far found in marine carbonates in China,confirming that the Puguang gas field evolved from a paleo-oil reservoir.The fluid conduit system at the time of intensive oil accumulation in the field Was reconstructed,and petroleum migration pathways were modeled using a 3-D model and traced by geochemical parameters.The forward modeling and inversion tracing coincided with each other and both indicated that oils accumulated in the Puguang-Dongyuezhai structure originated from a generative kitchen to the northwest of the Puguang gas field.The deposition of organic-rich Upper Permian source rocks dominated by sapropelic organic matter in the Northeast Sichuan Basin, the development of fluid conduit system that was vertically near-source rock and laterally near-generative kitchen,and the focusing of oils originated from a large area of the generative kitchen,were the three requirements for the formation of the giant paleo-oil reservoir from which the giant Puguang gas field evolved.The Puguang gas field had experienced a three-stage evolution.The post-accumulation processes,especially the organic-inorganic interaction in the hydrocarbon-water-rock system,had not only profoundly altered the composition and characteristics of the petroleum fluids,but also obviously changed the physicochemical conditions in the reservoir and resulted in complicated precipitation and solution of carbonate minerals.  相似文献   

准噶尔盆地车排子凸起沙湾组油藏输导体系研究   总被引：1，自引：0，他引：1       下载免费PDF全文

王坤  任新成  马奎  黄擎宇  石书缘  高建文 《高校地质学报》2016,22(2):350

新近系沙湾组是准噶尔盆地车排子凸重要的油气富集层位。在对沙湾组油藏分布、油性进行分析的基础上,结合前 人研究成果,将沙湾组油气的成藏过程分为两个阶段：古油藏阶段和次生调整阶段,并分别论述各阶段的输导体系及其时 空组合关系。古油藏阶段主要发育白垩系底部不整合面和红车断裂带同生逆断层组成的输导体系,研究区北部的白垩系底 面不整合有效输导厚度大,向西逐渐减薄为0;同生逆断裂是控制红车断裂带发育演化的主干断裂,形成时间早,断距 大。次生调整阶段则发育有沙湾组一段底部砂体、红车断裂带后生正断层、艾卡断裂带、凸起之上新近系张性断裂组成的 输导体系,沙一段砂体在凸起之上分布广泛,沉积连续而稳定,呈“毯状”自南向北逐渐减薄,做为最底部的砂体层,是 该阶段主要的横向输导体系;新近纪末期红车断裂带发育了一期正断裂,断裂活动强度大且规模较大,凸起之上则发育一 期与红车断裂带后生正断层同期形成的新近系正断层,凸起南部四棵树凹陷的艾卡断裂活动期长、断距大、延伸远,这些 断层构成了次生调整阶段的纵向输导体系。利用运移通道指数（MPI） 及颗粒荧光定量分析（QGF） 分别预测了白垩系底 不整合面及沙一段毯状砂体的优势运移区。平面上将运移通道指数在0.3以上的区域作为不整合输导层的优势运移区,将 QGF指数值大于3.8的区域作为沙一段毯状砂体的优势运移区。通过分析多套输导体系在油气成藏的不同阶段的空间组合以 及油气分布与输导体系的关系,明确了输导体系对油气成藏的控制作用,预测609井区具备油气输导的有利条件,可作为 下步勘探目标区。  相似文献   

Benzo[a]pyrene modulates the biotransformation,DNA damage and cortisol level of red sea bream challenged with lipopolysaccharide     

Jun Bo  Singaram Gopalakrishnan  Fang-Yi Chen  Ke-Jian Wang 《Marine pollution bulletin》2014

In animals, biotransformation and the immune system interact with each other, however, knowledge of the toxic mechanism of benzo[a]pyrene (BaP) on these two systems is not well known. The present study investigated the toxic effects of BaP on the biotransformation system, cortisol level and DNA integrity of red sea bream (Pagrus major). The results showed that cortisol level was induced under the challenge of lipopolysaccharide (LPS). Short-term exposure (96 h) of BaP at environmental concentration significantly increased the cortisol level, hepatic EROD activity and CYP1A1 mRNA expression. When P. major was exposed to BaP for 14 d followed by LPS challenge this increased the cortisol level, EROD activity and hepatic DNA damage except CYP1A1 mRNA expression. Combined with our previous data, which showed that BaP exposure can modulate the immunologic response in P. major challenged with LPS, a hypothetical adverse outcome pathway of BaP on fish was suggested.  相似文献   

古风化壳孔隙与裂缝发育特征及其油气地质意义   总被引：5，自引：0，他引：5  

李晓燕  蒋有录  陈涛 《地球科学与环境学报》2010,32(1):60-64,88

通过总结前人研究结果,利用数据整理、薄片观察等方法对古风化壳中孔隙和裂缝的发育规律进行了分析,并探讨了古风化壳结构的油气地质意义。研究结果表明,发育完全的古风化壳具有风化黏土层和半风化岩石的分层结构;半风化岩石中部孔隙和裂缝较发育,向上向下规模逐渐减小,至风化黏土层大孔隙和裂缝不发育。通过实例汇总认为,影响半风化岩石孔缝系统发育程度的主要因素包括风化基岩的岩性、风化的时间和强度、风化壳形成时期的剥蚀厚度和古风化壳的埋藏深度以及裂缝孔隙的充填特征。风化黏土层岩性致密,对油气的保存具有建设性作用;半风化岩层中部的孔缝连通体,既为油气运移的良好通道,也可作为油气聚集的有效储层。  相似文献