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| 1 | 北京延庆硅化木公园地质剖面陆相层序地层特征分析显示文摘陆相层序地层的研究是由海相层序地层研究演变而来,但陆相层序控制因素的不同造成陆相层序在规模、体系域发育特征等与海相层序都具有很大的区别。陆相层序受构造、事件沉积和气候等多因素影响,往往很难找到发育完整又易于观察的层序剖面。文中以北京北部延庆硅化木公园的中生界侏罗系'花盆'盆地为研究对象,通过露头观察、自然伽马点测和采样分析等地质方法,细致观察和分析了整个地质剖面,根据沉积和层序特征,划分出7个陆相层序,在各个层序内部又细分出各种不同体系域类型并确定了识别标志。根据研究结果,总结了陆相山间盆地层序地层的一些典型特征,初步划分出3种典型的陆相层序。同时将本区广泛出现的硅化木化石成因解释为大规模湖泛和火山作用的综合结果,并将木化石的出现作为大规模湖泛出现的标志。研究成果完整呈现了受构造、气候和事件沉积等多重影响的小型陆相山间盆地的湖泊层序典型特征,具备一定的代表性。 | 张元福 魏小洁 徐杰 王航 | 2012 | 地学前缘2012，19，1： | 14 |
| 2 | 阿尔及利亚Cheliff盆地构造演化规律与油气勘探方向探讨显示文摘西北非拥有丰富的油气资源,是世界油气勘探的热点地区之一,也是我国石油公司海外油气勘探的重要地区。Cheliff(谢里夫)盆地是位于阿尔及利亚北部泰勒构造带的一个复杂的中新生带含油气盆地,由于Cheliff盆地经历了多期次造山运动的改造和复合叠加作用,构造演化规律不明确,使其成为油气勘探难点。以构造地质学和成盆动力学理论为指导,通过综合利用重磁、地震和遥感、卫星资料的综合解释,认为Cheliff盆地中生代时为被动大陆边缘裂陷环境,新生代时强烈挤压反转,为中新生代叠合盆地。并应用了含油气系统的理论和研究方法,结合地震解释结果,进行有利区带评价和勘探目标优选,指出盆地内的东部坳陷及其周边的构造带(中央低隆带、Tliouanet隆起带、Mostanem隆起带、Ain Zeft台阶带)将是有利油气勘探区带。 | 蔡嵩 夏斌 万志峰 王利红 | 2014 | 天然气地球科学2014，25，4： | 1 |
| 3 | An Improved Method of Laser Particle Size Analysis and Its Applications in Identification of Lacustrine Tempestite and Beach Bar:An Example from the Dongying Depression显示文摘Grain size analysis is a common method in the study of sedimentology. For the consolidated sedimentary rocks, the traditional methods are rock slice observation and image analysis. In recent years, laser particle size analyzer is used widely in particle size analysis of sedimentary rock. Unlike the pretreatment of loose samples, the rock samples must be crushed, added acid to wipe out cement, and washed. However, in the step of washing, most of the fines component(less than 63 μm) in the suspended state should be inevitably lost. It will significantly affect the accuracy of particle size analysis, especially for siltstone. This paper presents a siltstone sample pretreatment method which core step is washing acid by centrifuge. Compared with traditional decantation method, the results show that the median particle size reduced 33.2 μm on average. Compared with the precipitation method which is commonly used for handling loose samples, the change of solid-liquid separation time is from 12 h to 10 min, while the average reduction of median particle size is about 15 μm. The grain size value corresponded to the cumulative volume of 10%/90% reduced 2.5 μm/20.3 μm on average. The percentage of the clay component less than 2 μm increased 2.88% on average. The fine particle(2–4 μm) and silt component(4–63 μm) increased 1.71% and 5.56% on average. Based on this method, two kinds of similar lacustrine siltstone were analyzed. They are tempestite and beach bar which are difficult to identify in the Lijin sub-depression, Dongying depression, Shengli oilfield, China. The final grain-size probability plot of tempestite is the type of 'one saltation component and three suspension components'. The content of suspension components can reach to 80%–90%. The beach bar is the type of 'one saltation component and two suspension components'. The content of suspension components can reach to 40%–45%. They both have the characteristics of high slope which means well sorting. But they can be distinguished based on the suspension sedimentary characteristics which were preserved by maximum degree in this kind of sample pretreatment method. | Yuanfu Zhang Chenlin Hu Xingmou Wang Min Wang Zaixing Jiang Junjie Li | 2017 | Journal of Earth Science2017，28，6： | 1 |
| 4 | Flume Tank Simulation on Depositional Mechanism and Controlling Factors of Beach-Bar Reservoirs显示文摘The beach-bar reservoir has become an important exploration target in China, but its depositional mechanism and controlling factors have not yet been fully modeled. They have become an inhibitory factor for the exploration and development of beach-bar reservoirs. The depositional mechanism of beach-bars and their controlling factors have been studied by means of a flume experiment including seven runs under controlled boundary conditions which were the water level(Run 1, Run 2 and Run 3), wave parameters(Run 1, Run 4 and Run 5) and initial slope(Run 1, Run 6 and Run 7). The experiment revealed that the development of beach-bar was controlled by water level, wave parameters and initial slope. The deposited locations of distal bar and nearshore bar were controlled by the water level. Two beach-bars were migrated downward when the water level falls(Run 1, Run 2 and Run 3). The width and thickness of distal bar and nearshore bar were controlled by wave parameters, especially the wave height. They increased with the scale of wave. But, the maximum thickness is limited by the water level(Run 1, Run 4 and Run 5). The distance between distal bar and nearshore bar was controlled by the initial slope. It became shorter with the steeper slope. Distal bar and nearshore bar changed into one bar when the initial gradient was greater than 1/20(Run 1, Run 6 and Run 7). The results suggest formative mechanism and controlling factors related to beach-bars. | Chenlin Hu Yuanfu Zhang Deyong Feng Min Wang Zaixing Jiang Chaowei Jiao | 2017 | Journal of Earth Science2017，28，6： | 1 |
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