鄂尔多斯盆地晚三叠世延长组湖侵期沉积特征

鄂尔多斯盆地晚三叠世延长组沉积阶段经历了长9段沉积期、长7段沉积期、长4+5段沉积期3次主要湖侵期。运用钻井、测井等资料,综合分析了湖侵期储集砂体的沉积相类型、沉积演化规律,认为在湖盆西侧储集砂体主要为半深湖—深湖相浊积砂,东侧主要为深水型三角洲前缘水下分流河道砂。各湖侵期砂体展布特征具有差异性,长9段砂体规模大,分布范围广,单层砂体厚;长7段三角洲砂体规模较小,浊积砂体发育,局部地区具有叠合连片特征;长4+5段盆地东北三角洲砂体延伸较远,横向连片性好,三角洲前缘水下分流河道砂体单层厚度薄,纵向多层叠加。研究还表明,湖侵期发育优质烃源岩,砂体具有较好的储集空间,生储配置关系好,易形成原生油藏,是下一步勘探的目标领域。图8表1参14     

松辽盆地中白垩世两次湖侵沉积在层序地层学研究中的意义

青山口和嫩江组早期发生两次大规模湖侵,是松辽盆地地质发展演化史上的两次重要事件。应用层序地层学的基本原理对中、上部含油组合的初步分析表明,青一段和嫩一、二段分别属于两类不同沉积层序的湖侵体系域。根据湖侵体系域在层序中的位置,可初步建立中、上部含油组合的层序地层学格架。     

EVOLUTION OF SHORELINES ALONG THE NORTH BANK OF HANGZHOU BAY DURING THE LATE STAGE OF THE HOLOCENE TRANSGRESSION

Based upon the analyses of the sedimentary characteristics, the parallelism of longitudinal streams of the netty drainage system in Shanghai coastal plain to the ancient shorelines, the hydrodynamics in the northern bank of the Hangzhou Bay and the distribution of sites of ancient cultural remains, this paper indicates that during the period of 7000—4000 a B. P., the south spit of the Changjiang River mouth developed southward, and only stretched to the nearshore area of Jinshanwei. The southern end of the spit was a compoundrecurved one. In addition, the evolution of the shoreline west of Jinshanwei during the same period is discussed.     

中国东部早第三纪海侵与湖相白云岩成因之关系——以东营凹陷沙河街组为例

在中国东部早第三纪沉积演化过程中曾周期性地发生过海侵,从而形成了具有海相特征的岩石类型、古生物组合.以东营凹陷沙河街组为例,在海侵期次划分基础上,通过对白云岩分布层位及其特征的研究,论证了白云岩形成与海侵的关系.研究结果表明,海侵事件的发生使得环境内所具备的条件有利于白云石排除动力学和热力学的障碍而形成白云岩.所以,白云岩产出层位与海侵发生层位具有一一对应的关系.     

对“岩石地层单位”的解释和应用之探讨

文章涉及的是理论地层学范畴的问题,如地层的概念,单位术语的应用,穿时和时侵现象的解释,并提出地层叠置体等专门术语。文章阐述了当前地层学存在的理论上自悖和应用上混乱的问题及笔者为探讨推进地层学深入发展所持的观点。     

Fictions of Origin: Law,Abjection, Difference

This article seeks to offer a critique of what it terms ‘Law-as-Logos’ (the Western conceptualisation of ideal Law in terms of pure ‘Presence’) from a perspective that combines some of the insights of contemporary psychoanalytic, deconstructive and feminist theory with recent developments in critical legal studies. The essay seeks to offer a re-theorisation of law, not as ‘Logos’ but as ‘difference’. The law, it will be argued, exists only as that arbitrary point of demarcation between the space of the sacred and the space of the abject and, to re-orient psychoanalytic readings of abjection towards a Derridean understanding of differance, the law may be articulated as the ‘trace’ that makes ‘presence’ possible whilst at the same time threatening its total erasure. Law-as-difference thus becomes maddening in its capacity to establish and erase boundaries and the second part of the essay examines this phenomenon particularly in the context of the relation between law-as-difference and the textuality of a Law that requires to be ‘put into writing’. It argues, in conclusion, that a theorisation of law-as-difference raises inevitably the question of the relation of ‘woman’ to the law and it ends with a re-positioning of the figure of Antigone as a means of interrogating the relation of the ‘feminine’ within the Western symbolic economy to the scandalous impurity of law-as-difference.¹ P. Goodrich, Languages of Law: From Logics of Memory to Nomadic Masks (London: Weidenfield and Nicolson, 1990), 268     

闽江河口区晚更新世以来的自然环境变化

闽江河口区处于中亚热带向南亚热带的过渡地带,自然环境演变复杂。本文着重研究其晚更新世以来的海陆变迁与气候变化,讨论其3次海进、2次高海面以及全球气候-海面变化对它的影响。     

全新世海侵与盐城市西冈古砂堤研究

西冈位于盐城市西部,是全新世海侵时代的产物,也是盐城市境内成陆最早的陆地。本文通过对全新世以来海面变化、西冈的地貌形态、沉积特征、形成条件等方面的研究,探讨全新世海侵对西冈古砂堤形成的影响以及苏中地区海岸的演变规律。     

珠江口盆地晚第四纪地层及环境初步研究

本文利用珠江口盆地四个工程钻井的古生物、古地磁、同位素及沉积物资料，对钻孔所揭露的地层进行划分，认为所钻遇的地层包括下更新统（上部）、中更新统、上更新统及全新统。依据古生物分异度及含量作出海平面变化曲线，识别出十个海侵期，利用钙质超微化石特征种的初现面和末现面资料，将本区海平面变化曲线与太平洋Ｖ＿（２８－２３９）氧同位素曲线对比，分析了本区晚第四纪以来的沉积环境和气候，认为早更新世晚期，中更新世中期，晚更新世早期及全新世本区气候温暖，沉积环境属陆架浅海环境。