北京十三陵中元古界蓟县系雾迷山组原地风暴沉积的砾屑体

研究区雾迷山组的层状藻叠层白云岩中存在一种属原地风暴成因的砾屑透镜体?砾屑体的底部为略下切的侵蚀面,顶为上凸形?砾屑呈放射状或叠瓦状排列,无磨圆作用?其形成过程是:在风暴初期,风暴浪对海底沉积物冲击?掀起?破碎,而后迅速原地堆积而成?风暴衰减后,正常沉积顺应砾屑体的顶面形态?     

吐哈盆地WM油田辫状河三角洲前缘砂体分析

湖盆可容空间较小时,辫状河三角洲相对发育,水下分支河道横向迁移频繁,易形成席状分布的砂体 (水下分支河道复合体 )。可容空间增大时,辫状河三角洲相对不发育,水下分支河道延伸不远,河道砂体较孤立,河口坝相对比较发育。文中根据水流和波浪强弱提出九种水下分支河道与河口坝的关系图,基本上总结了吐哈盆地WM油田三间房组河口坝的形态;并对水下分支河道复合体的形成机制提出了独特的推理。     

阿曼Daleel油田下白垩统Shuaiba组上段碳酸盐岩沉积相模式

下白垩统Shuaiba组上段（USH）是阿曼北部Daleel油田的主力产油层。随着勘探开发的深入，系统研究USH的沉积体系的内部构成、空间配置，建立沉积相模式，弄清有利储集体分布规律变得迫切必要。本文在地质、地震、古生物资料的基础上，采用沉积体系分析方法，对USH段的岩相组合和沉积环境做了详细研究，识别出了该段D层有滩间洼地(水深10～50 m)和浅滩(水深0～10 m)两种亚相，并在E1层的滩间洼地亚相发现了风暴沉积。研究了各亚相的沉积特征和沉积条件，建立了研究区下白垩系上Shuaiba组的沉积模式:区域浅海开阔台地背景上的伴有风暴沉积的障壁碳酸盐岩滩间洼地沉积模式。     

Sedimentary Facies Models on Carbonatite in the Upper Shuaiba Member of Lower Cretaceous in Daleel Field, Oman

The Upper Shuaiba Member (USH) is the main force pay bed in the Daleel field in northern Oman; 5 layers including A, B, C, D, and E were divided in profile, and layer D and layer E are the main beds. With the development of exploration in the Daleel oil field, studying the sedimentary systems about their inner composition and the collocation in dimension, and setting up the sedimentary models in the USH are becoming more and more necessary and important to meet the further explora- tion requirement. Based on the data of geology, seism, and paleo-biology, according to the analysis method on carbonatite depositional system, the litho-facies assemblage and sedimentary environment in the USH were studied. Intershoal low-lying sub-facies (where the water depth is 10–50 m) and shallow shoal sub-facies (where the water depth is not more than 10 m) were extinguished in the layer D, and storm deposit was found in layer E1, in which intershoal low-lying sub-facies also developed. The feature of the sedimentary sub-facies and the sedimentary condition were analyzed, and the sedimen- tary model was set up in the article: the carbonatite intershoal low-lying developed under the back-ground of open land in shallow sea, where storm events usually occurred in the Lower Cretaceous in the area.