厌氧沉积中有孔虫组合特征

厌氧沉积的有孔虫组合中，底栖有孔虫主要由Bolivina诸种和Buliminella tenuata组成，同时含有少量厌氧标志种Suggrunda eckisi；浮游有孔虫中Globigerina bulloides和G．quingueloba为数较多。底栖有孔虫与浮游有孔虫数量相比，浮游有孔虫数量很少。     

辽东半岛南部地区滨海黄土的沉积特征

分布在孙东半岛南端滨海地区的黄民庙岛群岛、胶辽半岛黄土一起构成了我国大陆黄土分布的最东界。通过对滨海马兰黄土粒度分布的因子对应分析、拟合度计算，结合滨海黄土的孢粉分析资料，初步认为：滨海黄土是风成的，是来自西北内陆的粉砂与冰期低海面海底砂混合堆积的产物，对应的样品因子载荷值及拟合度值计算表明，粒度分布中＞4φ粒级的细粒部分主要来自西北内陆，＜4φ粒级源于渤海湾西部。     

南沙曾母盆地沉积特征及其石油地质意义

本文分析了曾母盆地析生代地层的沉积特征，认为该盆地以南海退型碎屑沉积和台地型碳酸盐岩为主，沉积相类型丰富、生、储、盖层配置良好，是一重要的含油气盆地。     

南海西沙西南海域表层沉积物特征

西沙西南海域表层沉积物样品矿物成分，地球化学，微体古生物分析测试结果表明：沉积物可分为７种类型，沉积环境主要是陆坡，部分为深海平原，海洋生物，海洋化学以及火山物质的沉积起到了积极的作用，陆源物质的影响较小，它们主要来源于北部大陆和南部岛礁等物源区。     

声学方法进行海底沉物遥测分类：综述

本文讨论利用声学遥测方法进行海底沉积物分类的目的，用途及该项技术的发展背影和现状。重点介绍目前主要的用于浅，表层沉积物分类的声学遥测方法，包括选通等幅脉冲，宽频带脉冲，连续线性扫频脉冲等正入射方法和侧扫声呐，多波束测深等斜入射方法。     

A Numerical Model for Natural Backfill of Pipeline Trenches Subjected to Unidirectional／Oscillatory Flows

A numerical model for the self-burial of a pipeline trench is developed. Morphological evolutions of a pipeline trench under steady-current or oscillatory-flow conditions are simulated with/without a pipeline inside the trench. The oscillatory flow in this study represents the action of waves. The two-dimensional Reynolds-averaged continuity and Navier-Stokes equations with the standard k-e turbulence closure, as well as the sediment transport equations, are solved with the finite difference method in a eurvilirrear coordinate system. Both bed and suspended loads of sediment transport are included in the morphological model. Because of the lack of experimental data on the backfilling of pipeline trenches, the numericalmodel is firstly verified against three closely-relevant experiments available in literature. A detailed measurement of the channel migration phenomenon under steady currents is employed for the assessment of the integral performance of themodel. The two experimental results from U-tube tests are used to validate the model‘s ability in predicting oscillatory flows. Different time-marching schemes are employed for the morphological computation under unidirectional and oscillatory conditions. It is found that vortex motions within the trench play an important role in the trench development.