埕岛油田馆上段层序地层研究

应用河流相高分辨率层序地层学对埕岛油田馆上段储层进行层序地层研究,建立馆上段层序地层格架,并开展了层序地层与储层特征影响研究.通过研究将馆上段划分为3个中期旋回MSC1,MSC2,MSC3,6个短期旋回.并以中期旋回为单元分析了储层特征:MSC1砂体厚度较大,平面连通好,但层间非均质性强;MSC2主要为曲流砂坝沉积,砂体部分连通,厚度较薄,层间非均质性中等;MSC3为单期河道沉积,砂体基本为孤立式,层间非均质性最弱.     

Chemically-Modified Ion-Exchange Membranes as Sampling Devices for Gas-Phase Ammonia

Abstract

The ratio of solid-phase/gas-phase ammonia in ambient air may be of significance in the assessment of acid rain potential. Conventional sampling devices such as chemisorptive traps following a filter stage may give erroneous results and it is desirable that other approaches be found. Diffusive sampling tubes lined with a selective sorbent is one route. This paper reports on a study of the use of ion-exchange membranes for the collection of gas-phase ammonia.     

Emission mechanisms in stabilized iron-passivated porous silicon: Temperature and laser power dependences

Photoluminescence (PL) measurements of porous silicon (PS) and iron-porous silicon nanocomposites (PS/Fe) with stable optical properties versus temperature and laser power density have been investigated. The presence of iron in PS matrix is confirmed by Raman spectroscopy. The PL intensity of PS and PS/Fe increases at low temperature, the evolution of integrated PL intensity follows the modified Arrhenius model. The incorporation of iron in PS matrix reduces the activation energy traducing the existence of shallow levels related to iron atoms. Also, the temperature dependence of the porous silicon PL peak position follows a linear evolution at high temperature and a quadratic one at low temperature. Such evolution is due to the thermal carriers' redistribution and an energy transfer. Similarly, we have compared the laser power dependence of the PL in PS and PS/Fe layers. The results prove that the recombination process in PS is realised through the lower energy traps localised in the electronic gap. However, the observed emission in PS/Fe is essentially due to direct transitions. So, we can conclude that the presence of iron in PS matrix induces a strong modification of the PL mechanisms.     

南襄盆地唐河低凸起地质结构与勘探潜力

唐河低凸起是南襄盆地内分隔泌阳凹陷与南阳凹陷的次级正向构造单元,其地质结构研究对该区油气勘探和分析泌阳、南阳两富油凹陷的构造沉积充填关系均具有重要意义。以地震、钻测井及地化资料为基础,分析唐河低凸起的地层充填、构造特征、形成演化和成因机制,并探讨其油气勘探潜力。研究表明,唐河低凸起自下而上发育玉皇顶组、大仓房组、核桃园组、凤凰镇组及平原组。构造东西分块,为受桐河街断层分隔的南阳、泌阳两凹陷斜坡带组成的“类地垒”形态;南北分带,呈多个半地堑形态。构造演化分析将该区演化阶段划分为统一沉降期、差异沉降期、挤压定型期和拗陷期4个阶段,低凸起的成因机制与区域构造应力场转换下边界断层的差异活动密切相关。唐河低凸起具有多凹陷烃源岩供烃、多层系有效储层发育、长期高效输导体系及多类型圈闭垂向叠加的有利条件,具有一定的油气勘探潜力。     

大数据统计在碳酸盐岩油气田开发中的应用

为解决塔里木盆地下古生界奥陶系碳酸盐岩油气田后续高效井的部署难题,在精细构造成图的基础上,进行有效圈闭的识别和分类,通过海量钻井资料统计分析油气富集规律,重新落实构造对油气的控制作用。结果表明,研究区主要的构造圈闭类型可分为背斜圈闭、断背斜圈闭及与走滑断裂相关的断裂圈闭共3大类6小类;研究区碳酸盐岩储层具有一定的连续性和连通性,油、气、水的分布宏观上和微观上符合油气差异聚集原理。构造圈闭是油气最富集的区域,是高效井集中分布区,油气藏富集模式可分为圈闭内富集型、斜坡全充注型、斜坡半充注型和斜坡全漏失型四种,其中斜坡全充注型和圈闭内富集型是钻探获高效井最有利的地质目标。     

Titanium dioxide nanoparticles heavily doped with niobium: A light-induced electron paramagnetic resonance study

Light-induced electron paramagnetic resonance (EPR) spectra of titanium dioxide nanoparticles heavily doped with niobium(v) are studied. At low temperatures, the EPR signal caused by interband illumination is associated with paramagnetic Ti³⁺ sites in anatase, which, as the temperature rises above 210 K, are discharged to the non-paramagnetic Ti⁴⁺ state due to the escape of trapped photoelectrons and their recombination with holes. The temperature dependence of the integral EPR signal has a non-Curie character, especially in the temperature range where the discharge of Ti³⁺ centers is already significant.     

Symmetric Swallowtail Beams in the Rectangle Frame

A new type of symmetric swallowtail beam (SSB) in the rectangle frame is introduced here. These kinds of beams are highly tunable with multiple manipulation parameters. The focal length and the focus intensity can be controlled precisely. The SSBs can guide the off-axis vortex to their center. And the experimental results agree well with the numerical simulations. Besides, stable trapping of particles by utilizing the SSBs' auto-focusing property and rectangle symmetry is also observed.