论

针对     

缝洞型碳酸盐岩气藏多类型储集层孔隙结构特征及储渗能力——以四川盆地高石梯-磨溪地区灯四段为例

为全面表征缝洞型碳酸盐岩气藏多类型储集层的孔隙结构特征及储渗能力,借助多种测试技术对四川盆地高石梯-磨溪地区灯四段储集层样品进行分析与研究。首先利用铸体薄片和扫描电镜技术定性刻画了储集层的岩性、物性、储集空间和喉道特征,然后根据高压压汞得到的毛管压力曲线对储集层进行分类,最后基于多尺度CT扫描定量表征了3类样品的二维、三维孔隙结构特征。结果表明：研究区储集空间既有受组构控制的粒间溶孔、粒内溶孔和晶间溶孔等,又有不受组构控制的溶洞、溶缝和构造缝;喉道以缩颈、片状和管束状为主;根据毛管压力曲线特征,储集层可划分为缝洞型、孔洞型和孔隙型;缝洞型大孔隙与溶洞发育,分布均匀且连通性好,喉道粗大且数量较多,微裂缝与溶洞串接呈串珠状分布,沟通了孤立的储集空间,具有最好的储渗能力;孔洞型多尺度孔隙与溶洞发育,储集能力强,喉道粗大但数量较少,连通性较差,各储集空间无法有效沟通,渗流能力受限;孔隙型细小孔隙发育且分布不均,大部分区域被岩石骨架占据,喉道数量少且连通性极差,储渗能力弱。     

Occurrence of persistent organic pollutants in marine fish from the Natuna Island,South China Sea

Five marine fish species were collected from the Natuna Island, South China Sea to investigate the occurrence of polybrominated diphenyl ethers (PBDEs), polychlorinated biphenyls (PCBs), dichlorodiphenyltrichloroethane and its metabolites (DDTs). Concentrations of PBDEs, PCBs, and DDTs in marine fish ranged from 2.85 to 7.82, 14.3 to 48.1, and 7.99 to 40.3 ng/g lipid weight, respectively. Higher concentrations of PBDEs, PCBs, and DDTs were observed in Snakefish (Trachinocephalus myops), which might be attributed to their different feeding and living habits. PCBs were the predominant POPs in all marine fish, followed by DDTs and PBDEs. BDE 47 and PCB 153 were the predominant congener of PBDEs and PCBs, respectively. Compositional distribution of DDTs indicated the possible presence of fresh input sources around the Natuna Island. The ratios of o,p′-DDT/p,p′-DDT being less than 1 in fish samples suggested that DDT contributions from dicofol seemed considerably low. New input sources of DDT in South China Sea are worth further research.     

Observation of the seasonal evolution of the Yellow Sea Cold Water Mass in 1996–1998

We use the hydrographic data obtained during the joint survey of the Yellow Sea by the First Institute of Oceanography, China and the Korea Ocean Research and Development Institute, Korea, to quantify the spatial structures and temporal evolution of the southern Yellow Sea Cold Water Mass (YSCWM). It is indicated that the southern YSCWM is a water mass that develops in summer and decays in fall. In winter, due to the intrusion of the Yellow Sea Warm Current (YSWC), the central area (approximately between 34°N and 35°N, 122°E and 124°E) of the Yellow Sea is mainly occupied by relatively high temperature water (T>10 °C). By contrast, from early summer to fall, under the seasonal thermocline, the central area of Yellow Sea is occupied by cold water (T<10 °C). In summer, the southern YSCWM has two cold cores. One is formed locally southeast of Shandong Peninsula, and the other one has a tongue-like feature occupying the area approximately between 34°N and 37°N, 123°E and 126°E. The bottom layer temperature anomalies from February to July in the cold tongue region, along with the trajectories of the bottom floaters, suggest that the cold water mass in the northeast region has a displacement from the north to the central area of the Yellow Sea during the summer.     

基于层次分析法的大连区域雷灾易损性评价

根据大连地区近6年雷电灾害资料,40年雷暴资料,以大连地理、气候环境为背景,通过计算指标权重,采用层次分析法对大连区域雷灾易损性进行评价,并通过一致性检验。结果显示,金州新区属于极高风险区域,瓦房店属于高风险区域,大连、普兰店、庄河属于低风险区域,旅顺属于极低风险区域。结果表明雷灾区域易损性分析不仅取决于样本区域的自然雷暴日,还与样本区域的经济发展情况、人口密度、历史灾害等多方面因素有关,各指标影响权重也并非相同。采用层次分析法进行区域雷灾评价研究,能够有效减少人为因素,为防雷减灾提供了依据。     

渝东南下古生界页岩构造裂缝形成及分布控制因素

天然裂缝对页岩气储集和渗流有重要影响,但目前对页岩构造裂缝研究不够深入。本文通过露头、岩心裂缝观察和分析,探讨了渝东南下古生界页岩构造裂缝类型、形成机理及分布控制因素。基于裂缝特征及力学成因,将剪切裂缝分为高角度剪切裂缝、倾斜滑脱裂缝和水平滑脱裂缝。倾斜滑脱裂缝是在上覆岩层重力和水平构造应力共同作用下沿应力集中的软弱面发生剪切滑动形成,水平滑脱裂缝是在构造挤压应力作用条件下主要沿页理面方向的剪切或层间滑动形成;页理发育程度及岩层曲率是控制水平滑脱裂缝形成的关键因素,岩石矿物组成、构造作用及岩层厚度是控制其它类型构造裂缝形成和分布的主要因素,页岩岩石力学层的划分需要根据裂缝特征、岩性变化特征、岩石力学参数及沉积界面等综合确定,岩层厚度与层间构造裂缝密度呈负相关关系。     

福建永泰云山碱性流纹岩的厘定及其地质意义

福建永泰云山破火山石帽山群第三旋回顶部的霏细流纹岩含有霓石、钠铁闪石等碱性铁镁矿物。化学成化富硅、富碱,碱性指数（ＡＫＩ值）大于０．９０,Ｒｂ、Ｔｈ、Ｚｒ、Ｇａ等元素的含量高,Ｇａ／Ａｌ值大;贫钙、镁、铝和过渡族元素,轻、重稀土比值较小,并具有显著的负铕异常。在Ｋ２Ｏ－Ｎａ２Ｏ及以Ｇａ／Ａｌ值为基础的多种判别图上均投影在Ａ型花岗岩区。上述特征与其邻近的魁歧典型碱性花岗岩相似,也可与国外有关典型碱性     

五十年创业成果丰硕继承伟业再创辉煌--纪念北京矿产地质研究院成立五十周年

52年前,1955年6月18日北京矿产地质研究院宣告成立,开始了创新创业的历程.     

LA-ICPMS U-Pb Ages of Zircon from Metaleucosomes, Olongbuluke Microcontinent, North Qaidam, and Implications on the Response to the Global Rodinia Supercontinent Assembly Event in NW China

INTRODUCTION The Olongbuluke microcontinent , which wasdisintegratedfromthe northern margin of the Qaidamblock (Lu,2002) ,is composed of a two-fold base-ment with cover strata . The lower basement is themedium- to high-grade Delingha complex and theDakendaban Group, and the upper is the low-gradeWandonggou Group. The Wandonggou Group of theupper basement experienced a Late Mesoproterozoicmetamorphic event (see Yu et al .,1994) ,consistentwith the early isotopic geochronological respo…