中南半岛影响南海夏季风建立和维持的数值研究

利用美国大气研究中心研制的第三代公共气候模式(CCM3)模拟了中南半岛对南海夏季风的建立和维持的影响,数值试验结果表明,中南半岛对南海夏季风的建立和维持起了非常重要的作用.同时还就中南半岛影响南海夏季风建立和维持的机制进行了讨论.     

断陷湖盆隐蔽油藏预测及勘探的关键技术--高精度地震探测基础上的层序地层学研究

近十余年世界的我国隐蔽油藏勘探取得了巨大进展,其关键技术是高精度的三维地震及在此基础上的层序地层学研究,二者的结合已被油气产业部门当作勘探中的“权威性技术”。断陷湖盆在我国东部含油气资源的重要性居首位,控制层序形成演化的诸因素中,构造,古气候和在区域古地理格局中的位置对湖盆的类型和演化起着决定作用,需要按照断陷湖盆的沉积构造演化特征建立有预测功能的层序构成模式,在成熟的勘探区,重新建立等时层序地层格架,进行体系域精度的工业制图,阐明沉积体系的分布规律,使用高精度地球物理技术对圈闭定位,并对构造坡折带和低位域扇体给予重点注意,用这种技术方法指导隐蔽油气藏的勘探,已经并必将有许多重要发现。     

Contents To Volume 88

Volume Contents

Contents To Volume 88     

积极推动“数字海南”建设

海南省具有得天独厚的发展优势,“数字地球”是实现整体可持续发展的重要保障,将有力推进全省信息化的进程,促进经济发展。     

Study on the simulation of transparency of Lake Taihu under different hydrodynamic conditions

It was indicated in this study that there were negative relations between the concentrations of suspended solid (SS) and transparency according to the analysis of measured data of Lake Taihu. Their relations in pervious studies were reviewed, which showed that the changes of transparency in Lake Taihu could be reflected by simulating suspended solid concentration (SSC). Measured data showed that the changes of SSC with wind speed were similar at different water depths. SSC increased with the increasing of wind speed. Both wave and lake current of Lake Taihu had positive relations with SSC. However, wave was the main factor affecting sediment suspension, while flow took the second place. In this study, a numerical model coupling lake current, wave and SSC of Lake Taihu was developed. In the SS model, the combined effects of wave and current were included. The amounts of suspended and deposited sediments near the lake bed surface layer were treated separately. The stochastic characteristics of turbulent flow pulsation near lake beds were also considered, and the start-up conditions of sediment suspension were introduced to the model. The model elucidated the mutual exchange processes between sediment particles in SS and active sediments within and on the bed surface layer. Simulated results showed that lake current had relatively significant effects on the SSC at littoral areas of Lake Taihu, while SSC at the central area of the lake was mainly influenced by wave. The changes of transparency with SSC were simulated for Lake Taihu using this model. Calculated results were validated by measured data with good fitness, which indicated that the model is basically suitable for the simulation and prediction of transparency of Lake Taihu.     

东湾背斜构造特征与勘探目标选择

东湾背斜位于准噶尔盆地南缘,采用多种地球物理及地质方法,通过多次论证,证明构造是落实的,且其烃源岩、储集层以及盖层条件都较好,但2003年完钻的东湾1井钻探结果却无任何油气显示。在深入了解准噶尔盆地南缘区域构造背景的基础上,探讨了东湾背斜的构造特征、构造演化过程及油气成藏条件,总结出东湾背斜的油气聚集规律,指出在东湾地区可能存在的两种油气藏模式,最后提出下步有利勘探目标区。     

云南巍山—永平碰撞造山带走滑拉分盆地铜金多金属矿成矿流体系统：稳定同位素特征及热液来源

云南巍山—永平矿集区位于兰坪走滑拉分盆地南段,有铜金多金属中、小型矿床及矿化点140余处,盆地发育和成矿作用与印度—亚洲板块碰撞密切相关。为了探索该矿集区成矿热液的来源,研究了该区成矿流体的稳定同位素特征。区内成矿流体系统可分为紫金山子系统与公郎弧子系统。公郎弧子系统内铜钴矿床成矿流体的δD为-83.8‰~-69‰,δ18O为4.17‰~10.45‰,δ13C为-13.6‰~3.7‰,成矿流体主要来源于岩浆水及地层水。紫金山子系统内金、铅锌、铁矿床成矿流体的δD为-117.4‰~-76‰,δ18O为5.32‰~9.56‰,δ13C为-10.07‰~-1.5‰;锑矿成矿流体的δD为-95‰~-78‰,δ18O为4.5‰~32.3‰,δ13C为-26.4‰~-1.9‰,成矿流体来源于地层水以及岩浆水。受印度板块与亚洲板块碰撞造山作用的影响,在该盆地内,成矿流体自南西向北东大规模迁移过程中,先形成温度、盐度较高的公郎弧子系统,随着流体向北东推进,温度、盐度逐渐降低,流体成分发生变化,演变为紫金山子系统。     

黄骅坳陷新近系馆陶组Ⅲ段辫状河相高分辨率层序分析

以高分辨率层序地层学理论为指导,以野外露头、钻井岩心、测井及地震资料的综合研究为基础,研究了黄骅坳陷新近系馆陶组Ⅲ段的高分辨率层序地层特征,识别出1个长期、两个中期和若干个短期基准面旋回层序。其中短期、中期旋回都可分为向上“变深”非对称型和向上“变深”复“变浅”对称型两类。深入探讨了不同结构类型和充填样式的各级次基准面旋回层序对储层的控制作用,认为储集砂体主要发育于长期及中期基准面旋回上升的早期。     

藏北长江源地区河流地貌特征及其对新构造运动的响应

对藏北长江源地区河谷地貌和新构造变形调查发现,该区具有平行式水系格局,河谷地貌以形态不同的窄谷和宽谷为特点,新近纪以来该区主要经历了早期挤压和晚期伸展构造演化过程,产生了褶皱-逆冲、走滑剪切、正断层和地堑构造3种构造变形样式。长江源区河谷地貌的形成演化明显受新构造运动的影响,新构造运动不仅控制了河谷地貌形态与水系格局,而且影响了河流阶地分布以及洪(冲)积扇的形态、结构。长江源地区主要水系至少自全新世以来是沿新构造运动产生的不同性质断裂构造溯源侵蚀发育而成。