柴达木盆地昆北油田路乐河组辫状三角洲沉积特征   总被引：4，自引：0，他引：4       下载免费PDF全文

宫清顺  寿建峰  黄革萍  李森明  王艳清 《地质科学》2012,47(1):116-128

柴达木盆地昆北油田路乐河组主要为砂砾岩、含砾砂岩、砂岩、粉砂岩及泥岩构成的陆源碎屑岩组合,通过详细的岩心特征和区域地质分析,将其确定为辫状三角洲沉积,其微相包括(水下)分流河道、河口坝、席状砂、泛滥平原、分流间湾和前三角洲泥等,其中以(水下)分流河道沉积为主体。该辫状三角洲的纵向岩石组合序列反映为典型的退积型三角洲,即发育于可容纳空间与沉积物补给速率比值(A/S比值)逐渐增大的湖侵环境。沉积旋回早期发育辫状三角洲平原,旋回中后期发育辫状三角洲前缘和前三角洲。辫状三角洲整体呈自南西向北东的扇形展布,平面上发育两期分支物源体系,分别位于Q6和Q16井区。实验分析测试、试油等资料揭示辫状三角洲(水下)分流河道砂体储集性能较好,它的发育控制路乐河组油气的纵向与平面分布。  相似文献   

复杂介质中平面波模拟的单程波方法          下载免费PDF全文

孙鲁平  曹宏  姚逢昌  首皓 《地震学报》2010,32(2):167-174

地震勘探中平面波分解技术在地震资料处理与反演领域均得以广泛应用,通过正演算法模拟平面波记录有助于理解和检验平面波分解的效果和精度.本文给出一种用以模拟复杂介质中平面波的数值算法,考虑了振幅随入射角度的变化.与前人研究的平面波模拟算法相比,该算法基于波动方程的单程波解法,不但适用于横向非均匀介质,在地层倾角水平条件下还能够准确模拟振幅随入射角关系.通过Marmousi模型的计算实例,证明了本文方法的可行性.  相似文献   

青岛和烟台滨海海、气温差的时间变化     

王少文  薛德强  赵绪孔 《海洋科学进展》1994,(2)

本文根据近３０ａ来青岛和烟台逐月气温及滨海水温资料，分析了青岛和烟台海、气温差的时间变化，发现秋、冬季节南岸青岛海、气温差大于北岸烟台；春、夏季则相反．通常当年平均或季平均气温为负距平时，年平均或冬季平均海、气温差为正距平，而夏季平均海、气温差为负距平，对于ＥｌＮｉｎｏ及反ＥｌＮｉｎｏ年结论与之相反．  相似文献   

Numerical Simulation of Bed Separation Development and Grout Injecting into Separations   总被引：2，自引：0，他引：2  

Shou Gen Chen  Hua Guo 《Geotechnical and Geological Engineering》2008,26(4):375-385

In this paper, the Cosserat theory that has been incorporated into a three dimensional finite element code COSFLOW, is applied to analyze the development of bed separations in the layered overburden and grout injection into the bed separations. The mechanism of bed separation development during the longwall mining is investigated. A parametric study is carried out to investigate the effect of major factors including hard rock grade, panel height and panel weight on bed separation development. Based on the modeling, a conceptual model to describe the development process of bed separation is proposed. The effect of grout injecting into the bed separations on subsidence reduction is also studied and the conclusion agrees well with the common realization.  相似文献   

障壁岛及其后缘碳酸盐岩储层的成因模式与预测     

郭庆新  周进高  寿建峰 《海相油气地质》2008,13(1):1-8

塔里木盆地、鄂尔多斯盆地和四川盆地主要碳酸盐岩储层的发育均与障壁岛或其后缘等沉积环境有关,并受早期大气淡水淋滤溶蚀作用、白云石化作用、古岩溶作用以及埋藏溶蚀作用等成岩因素的控制。认为三大盆地碳酸盐岩储层可划分为大气淡水淋溶型礁滩灰岩储层、古岩溶型礁滩灰岩储层、白云石化型礁滩白云岩储层和古岩溶型含膏白云岩储层等四种类型。提出了与障壁有关的储层综合成因与预测模式,其中构成障壁的台地边缘礁滩带是大气淋溶型礁滩灰岩储层、古岩溶型礁滩灰岩储层和白云石化型礁滩白云岩储层的有利发育区,而障壁岛后缘的蒸发盆地边缘坪区域是古岩溶型含膏白云岩储层有利发育区。  相似文献   

班公湖—怒江缝合带西段物玛地区原“晚古生代”混杂岩块中发现中生代化石     

张少文  纪占胜  武桂春  李涌溪 《地质论评》2021,67(3):67040012-67040012

在班公湖—怒江缝合带西段铁杂—日雍构造混杂岩带物玛地区,原划为上石炭统拉嘎组地层中新发现了中生代孢粉化石14种及未定种,这些化石的发现为将该地层修订为下白垩统多尼组提供了古生物学依据。上石炭统拉嘎组被修订后,研究区班公湖—怒江缝合带不再存在拉嘎组混杂在中生代地层中的现象。同时本次研究在铁杂—日雍构造混杂岩带以南的冈底斯—腾冲地层区物玛分区原划为上石炭统拉嘎组中,发现中生代孢粉化石10种及未定种,并在其灰岩夹层中发现晚侏罗世珊瑚化石6种及未定种,同时在原划分为中二叠统下拉组中也发现晚侏罗世珊瑚化石。根据化石时代和区域地层对比,拉嘎组和下拉组分别被修定为上侏罗统萨波直不勒组和吐卡日组。至此,物玛分区的上侏罗统以萨波直不勒组和吐卡日组为代表,与其北侧的班公湖—怒江地层区上侏罗统可进行对比。本文以班公湖—怒江缝合带西段铁杂—日雍构造混杂岩带为例,证实在混杂岩带开展古生物学研究非常必要。  相似文献   

冯家江流域水体中氮的空间分布特征     

陈雯  余绍文  张宏鑫  刘怀庆 《中国地质调查》2021,8(1):51-59

冯家江是北海市区重要的生态廊道。研究冯家江流域水体中氮的空间分布特征、污染来源、影响因素,对掌握冯家江流域氮污染现状及污染防控等具有重要的现实意义。本研究应用地统计学方法分析了冯家江流域地表水及沿岸地下水中氮污染物的空间分布特征。结果表明,地表水中氮污染物呈现出“高氨氮、低硝氮”的特征,NH₃-N质量浓度平均值高达5.42 mg/L,NO₃-N在孔隙潜水中明显富集,其质量浓度最高达32.63 mg/L。城镇生活污染物、人畜粪便及农业生产中化肥的施用是地表水、地下水中氮污染物的主要来源。pH值、氧化还原条件及包气带岩性结构和厚度是影响冯家江流域水体中氮污染物迁移转化的重要因素。  相似文献   

The integrated impacts of natural processes and human activities on groundwater salinization in the coastal aquifers of Beihai,southern China   总被引：1，自引：0，他引：1  

Qinghua Li  Yanpeng Zhang  Wen Chen  Shaowen Yu 《Hydrogeology Journal》2018,26(5):1513-1526

Salinization in coastal aquifers is usually related to both seawater intrusion and water–rock interaction. The results of chemical and isotopic methods were combined to identify the origin and processes of groundwater salinization in Daguansha area of Beihai, southern China. The concentrations of the major ions that dominate in seawater (Cl^?, Na⁺, Ca²⁺, Mg²⁺ and SO ₄ ^2– ), as well as the isotopic content and ratios (²H, ¹⁸O, ⁸⁷Sr/⁸⁶Sr and ¹³C), suggest that the salinization occurring in the aquifer of the coastal plain is related to seawater and that the prevailing hydrochemical processes are evaporation, mixing, dissolution and ion exchange. For the unconfined aquifer, groundwater salinization has occurred in an area that is significantly influenced by land-based sea farming. The integrated impacts of seawater intrusion from the Beibuwan Gulf and infiltration of seawater from the culture ponds are identified in the shallowest confined aquifer (I) in the middle of the area (site BBW2). Leakage from this polluted confined aquifer causes the salinization of groundwater in the underlying confined aquifer (II). At the coastal monitoring site (BBW3), confined aquifer I and lower confined aquifer II are heavily contaminated by seawater intrusion. The weak connectivity between the upper aquifers, and the seaward movement of freshwater, prevents saltwater from encroaching the deepest confined aquifer (III). A conceptual model is presented. Above all, understanding of the origin and processes of groundwater salinization will provide essential information for the planning and sustainable management of groundwater resources in this region.  相似文献   

Economic viability of Asia-Europe container transport through Arctic routes based on Arctic sea ice          下载免费PDF全文

Luo Qiaoyun  Liu Wei  Shou Jianmin 《极地研究》1988,31(4):447

  相似文献   

Latent spatio-temporal activity structures: a new approach to inferring intra-urban functional regions via social media check-in data   总被引：1，自引：0，他引：1  

Ye Zhi  Haifeng Li  Dashan Wang  Min Deng  Shaowen Wang  Jing Gao 《地球空间信息科学学报》2016,19(2):94-105

Abstract

This article introduces a novel low rank approximation (LRA)-based model to detect the functional regions with the data from about 15 million social media check-in records during a year-long period in Shanghai, China. We identified a series of latent structures, named latent spatio-temporal activity structures. While interpreting these structures, we can obtain a series of underlying associations between the spatial and temporal activity patterns. Moreover, we can not only reproduce the observed data with a lower dimensional representative, but also project spatio-temporal activity patterns in the same coordinate system. With the K-means clustering algorithm, five significant types of clusters that are directly annotated with a combination of temporal activities can be obtained, providing a clear picture of the correlation between the groups of regions and different activities at different times during a day. Besides the commercial and transportation dominant areas, we also detected two kinds of residential areas, the developed residential areas and the developing residential areas. We further interpret the spatial distribution of these clusters using urban form analytics. The results are highly consistent with the government planning in the same periods, indicating that our model is applicable to infer the functional regions from social media check-in data and can benefit a wide range of fields, such as urban planning, public services, and location-based recommender systems.  相似文献