松辽盆地东南部油气、煤层气后生蚀变硫同位素特征

对松辽盆地东南部上白垩统泉头组、姚家组和嫩江组岩石中黄铁矿及硫同位素特征研究表明,泉头组、姚家组中后生还原褪色作用形成的灰色、灰绿色砂岩中的黄铁矿及硫同位素均显示出了深部来源的油气、煤层气有机流体作用成分特征。该区原生沉积成岩岩石及黄铁矿中硫同位素的δ^34SV-CDT为正值,油气、煤层气有机流体还原作用岩石及黄铁矿中δ^34SV-CDT为负值。油气、煤层气还原作用不仅使杂色、紫红色原生氧化砂岩还原为灰色、灰绿色还原性砂岩,还使岩石还原容量大大增强,而且油气、煤层气在有机流体与岩石的相互作用过程中有铀的叠加富集,岩石铀含量普遍增加,局部可形成铀异常、铀矿化。首次在门达地区姚家组含矿砂岩中发现网脉状水云母化,显示铀成矿具有低温热液蚀变特征,铀矿化与低温热流体作用有关。     

黄河上游某电站近坝滑坡稳定性研究

黄河上游某电站库首滑坡距大坝仅400多米,一旦失稳将会对大坝造成严重危害。笔者采用工程地质分析法及有限元数值模拟研究了滑坡的成因机制及应力场特征,在此基础上采用极限平衡法演算了滑坡在各种工况下的稳定状况。表明滑坡在蓄水过程中有可能产生下滑失稳。     

含芘氨基酸衍生物对水中Cd2+、Pb2+的高选择性识别研究

本文报道了一种新型含芘氨基酸衍生物-L-[4-（1-芘基）]丁酰基苯丙氨酸（缩写为PLT）,通过对PLT与离子结合前后其二聚体/单体荧光发射峰强度比的检测表明该衍生物对水中的重金属离子Cd^2＋和Pb^2＋表现出了极强的识别性能,而对水中所存在的其它离子则具有完全不同的响应特性.     

复平面上广义插值多项式的平均逼近阶

研究了复平面上 ,广义 Hermite-Fejer插值多项式的收敛性。得到了其在空间 lp(| z| =1 ) (0 相似文献   

A new genus of Scoliidae (Insecta: Hymenoptera) from the Lower Cretaceous of northeast China

A new genus and species of Scoliidae (Hymenoptera), Sinoproscolia yangshuwanziensis gen. et sp. nov., is described from the Lower Cretaceous Yixian Formation in Inner Mongolia, China and attributed to the subfamily Proscoliinae. Some characteristics, including complete crossveins 1r-rs and 2r-m in the forewing, and a free section present in almost all longitudinal veins indicate a basal position of the new genus in Proscoliinae. The presence of vein 2A suggests its atavistic origin in Sinoproscolia gen. nov. rather than a true plesiomorphy.     

保山水汞异常与中强震关系研究

对云南保山滇14井1992—2004年水汞观测资料与其周围400km范围内发生的所有Ms≥95．0地震进行了研究。结果表明：在中强地震发生前,滇14井水汞存在短临异常,且异常特征清晰,异常幅度明显;所提取的短临预报指标对应地震效果较好,但对应范围受区域地质构造控制,主要对应云南西部地区及缅甸弧型构造带中的中强地震。     

新疆阿尔金山清水泉-花泉子地区地球化学特征

在新疆阿尔金南缘断裂带中段的清水泉-花泉子地区,水系沉积物异常多呈带状沿断裂带分布,基性、超基性杂岩体是引起大而强异常的主要原因.通过对岩石化学特征和微量元素、稀土元素地球化学特征的剖析,表明其是同一岩浆结晶分异的产物,本区主要矿产应为铜,辉长辉绿岩是主要的含矿层位.经过加大了力度勘查,最终提交铜资源量15万 t.     

黄汲清院士与第四纪冰川研究

黄汲清院士是在多方面作出重大贡献的地质学大师，也是第四纪冰川研究的先驱者。他于１９３２￣１９３５年在瑞士完成博士论文期间，受到良好的冰川地质学训练。于１９４３￣１９４４年与合作者对天山南麓台兰河谷中游地质调查中，对冰碛与非冰碛沉积物进行仔细的正确的调查和精美的地质制图，撰写出高水平的论文，由此对中国第四纪冰川研究作出了重要贡献。他关注中国东部第四纪冰川研究的进展，指出忽视古气候研究是工作中的重要缺     

X-ray CT and hydraulic evidence for a relationship between fracture conductivity and adjacent matrix porosity

Multi-phase flow in fractured rocks plays an important role in any hydrocarbon recovery process, be it for environmental remediation or natural oil and gas extraction. Fractures may form the primary production conduits, and the mass transport at the fracture interfaces with the matrix determines the effectiveness of extraction processes. This paper presents specific evidence for a relationship between fracture apertures and the porosity of the adjoining perpendicular layers in Berea sandstone samples. Measurements of fracture apertures were done with high-resolution Micro-Computed Tomography (MCT) with a voxel resolution of about 0.05 mm in three dimensions. Multi-phase fluid flow experiments were done using a medical CT scanner with a voxel resolution of about 1.00 × 0.25 × 0.25 mm. MCT evidence shows a correlation between aperture and the porosity of the intersected layers. The comparison was made by generating two-dimensional maps of matrix porosity and CT values adjacent to the fracture and of the corresponding fracture apertures. High-porosity layers are lined up with large fracture apertures. Multi-phase fluid experiments provided hydraulic evidence that the high-porosity layers have high permeability. Oil injection into a water-saturated sample was tracked by a sequence of transverse scans near the downstream tip of a fracture. The hydraulic evidence from the two-phase flow experiments also confirms high permeability in fracture strips adjacent to high-porosity and high-permeability layers. The reasons for the relationship between fracture aperture and the properties of the adjacent layers are not fully understood. Some explanation for the physical and hydraulic observations rests in the method of fracturing, fracture propagation, and the lithological characteristics of the rock.     

“Cretaceous black flysch” in the Pieniny Klippen Belt, West Carpathians: a case of geological misinterpretation

This is a critical assessment of the paper by Oszczypko et al. (2004: Cretaceous Research 25, 89–113), in which they tried to prove a mid-Cretaceous age for the Szlachtowa (“black flysch”) and Opaleniec Formations, in the Pieniny Klippen Belt, West Carpathians, both of which had previously been shown to be of Jurassic age. We argue that the mid-Cretaceous age assignment is a misinterpretation, primarily resulting from their field samples having been collected from some Cretaceous lithostratigraphic units, tectonically associated with the Jurassic formations, and/or from tectonic contact-breccias involving Jurassic and Cretaceous strata. In addition, we suggest that they have overlooked a number of significant palaeontological papers, published since 1962, which record the presence of in situ ammonites, aptychi, belemnites, thin-shelled bivalves (Bositra), gryphaeids, foraminifera, and ostracod assemblages, all indicating a Jurassic (mainly Aalenian), and not a Cretaceous, age for the Szlachtowa Formation, and also the in situ Jurassic (Bajocian) ammonites and thin-shelled bivalves (Bositra), Bositra-microfacies, and age-diagnostic foraminiferal assemblages of the Opaleniec Formation.Our presentation here of recently published dinocyst data from well-preserved assemblages further supports the Jurassic ages for the Szlachtowa (“black flysch”) and Opaleniec Formations.