冀东油田南堡断裂构造带主要断层封闭性研究

采用断层面剖面法和综合分析的方法对南堡断裂构造带内的主要断层的封闭性进行了钻前预测，指出主要断层的封闭性对该构造带内潜在油气藏形成的作用和寻找较大规模的油气藏的有利层位。     

PCBs in Central Vietnam coastal lagoons: levels and trends in dynamic environments

PCBs were analysed in surficial sediments and selected sediment cores collected between 2002 and 2008 in Central Vietnam coastal lagoons. The aim was to determine contamination levels and trends, and to evaluate the effects of anthropogenic pressures and natural events. Samples were mostly fine-grained with low total PCB concentrations (0.367-44.7 μg kg⁻¹). Atmospheric transport and post depositional processes modify to some degree the fingerprint of PCB inputs to the environment favouring the predominance of 3, 4 and 5 chlorinated congeners. The similarity of congener distributions in contemporary surficial samples also suggests the presence of a unique source over the entire study area, probably connected to mobilisation and long range transports from land-based stocks. The removal of consistent sediment layers is hypothesised based on repeated samplings of the same area. Natural meteorological events (such as typhoons) are suspected to be responsible for these sediment losses.     

中国中、新生代含油气盆地构造和动力学背景

中国有大约26个含油气盆地。盆地主要有两种类型:(1)伸展盆地;(2)前陆(或挠曲)盆地。第一种伸展盆地主要位于东部,第二种前陆盆地主要位于中部和西北地区。本文讨论了伸展和前陆盆地的以下特征:(1)沉降史;(2)热史;(3)构造样式和运动学。结合深部地球物理和火山岩资料,确定了盆地的地球动力学背景,并且推测盆地形成与西太平洋板俯冲作用和特提斯洋闭合有关。     

A weight-of-evidence approach to assessing the ecological impact of organotin pollution in Dutch marine and brackish waters; combining risk prognosis and field monitoring using common periwinkles (Littorina littorea)

In the present study an integrated ecological risk assessment based on multiple lines of evidence (LOEs) was evaluated in order to better assess the risk from TBT in Dutch harbours and open coastal waters. On the basis of spatial distributions of measured tributyltin (TBT) concentrations in sediments and suspended matter, predictions of the intersex index (ISI) in Littorina littorea and the ecological risk expressed as the Potentially Affected Fraction (PAF) of species were made. The results were compared to actual ISI measurements and presence of L. littorea in the field. The PAF calculated on the basis of TBT levels for open coastal waters ranged from 4.2% to 15.3%; for harbours it ranged from 3.5% to 26.9%. Significant intersex levels were observed only in waters where the risk was calculated above 10% PAF. This study suggests that the absence of L. littorea from some harbours with high ecological risk values can be explained by high TBT concentrations. A call is made for the use of integrated approaches like weight-of-evidence (WOE) to help practitioners improve ecological risk assessment.     

分析负压效应的计算机程序

我们开发了一种计算方法,它能估计埋入海床的底部开口或封闭的倒置桶形结构S以下称其为"桶形基础"或简称"桶基"）抗拨能力或上拔阻力,在估计中充分考虑到了结构的负压效应。该计算方法的基本原理十分简单,可是对桶基几何形状、基土情况以及失稳方式等条件的综合考虑却是很周到的。因为这个方法适合于一些简单参量的研究,所以它在小型离岸平台、水上CPT-钻架、碇泊浮体负压锚等结构物,在如何最恰当使用负压的设计方面尤其适宜．它是一个精巧的软件系统,耗电很少。     

辽西及其北部邻区中生代盆地基底结构与盆地构造样式

辽西及其北部邻区在中生代发育了一系列以北东－北北东走向为主的含煤、油气盆地。这些盆地发育在不同的基底结构单元上,由南向北依次是华北板块北缘、西拉木伦加里东褶皱带和兴蒙海西褶皱带。它们在组成结构、基底断裂发育、岩石圈厚度、刚性和稳定性等方面均有明显差异。正是这些差异控制或影响了发育其上的盆地构造样式,使其具有多样性。基底结构对盆地的影响或控制是通过岩石圈伸展和地幔热流作用实现的。