川西北地区中三叠统雷口坡组沉积相再认识

基于区域构造背景分析,通过钻井岩心观察、露头剖面调查和薄片鉴定,以及露头-连井剖面对比、骨干地震剖面解释,深化了川西北地区雷口坡组构造-沉积特征及沉积相演化的认识。研究认为:①川西北部江油—绵竹一带雷口坡期处于沉降-沉积中心,晚三叠期坳陷向南扩展至峨眉垮洪洞一带。②雷口坡组自西向东发育台地边缘相、局限台地相及蒸发台地相。台地边缘相发育浅滩亚相,主要包括砂屑滩、鲕粒滩微相;局限台地相由浅滩、潮坪及潟湖亚相组成,包括砂屑滩、藻云坪、灰云坪、潮道、淡化潟湖、咸化潟湖、半咸化潟湖等微相;蒸发台地相由蒸发坪及盐湖亚相组成,主要发育膏坪、云膏坪、膏云坪、云坪,膏质盐湖及石盐盐湖等微相。③台缘浅滩规模大,颗粒为致密的内碎屑及鲕粒;台内滩规模较小,颗粒类型主要为藻屑。建立了雷口坡组“台地边缘相—局限台地相—蒸发台地相”沉积模式,沉积变迁受到沉积基底向西北倾斜的背景及海侵-海退旋回的控制。

我国学校社会工作研究演进脉络:1989—2020年CNKI的文献可视化分析

利用可视化图谱分析我国近30年学校社会工作研究领域的研究热点和发展脉络,为我国学校社会工作领域研究提供参考。选取1989—2020年CNKI数据库收录的有关国内学校社会工作的文献信息,运用CiteSpace软件对文献进行可视化分析,共纳入706篇文献。文献表明:各高校为研究机构的主要阵地,且机构之间合作较为松散;少数研究者之间形成了若干相互独立的合作团体,但相互之间合作规模不大,研究缺乏持久性。我国近30年学校社会工作研究经历了萌芽期、快速发展期、相对稳定期3个阶段,研究热点主要聚集在学校社会工作理论的本土化及其价值、制度研究,学校社会工作涉及的场域及其嵌入研究,学校社会工作的介入研究,学校社会工作的角色定位及人才培养研究4个方面,涉及到的热点词分别为:学校社会工作、社会工作、高校、学生工作、大学生,前沿研究方向聚焦在伦理困境、社会工作方法、学校小组工作和个案工作。

Sedimentary Facies and Distribution of Reservoir Rocks from the Feixianguan Formation in the Daxian-Xuanhan Region, NE Sichuan

The Lower Triassic Feixianguan Formation in the Daxian-Xuanhan region, northeastern Sicbuan is interpreted to be a carbonate platform intermediate between the West Hubei-East Cbongqing marine basin and Guangyuan-Wangcang marine basin. Outcrops, well logs and seismic data have disclosed that three sedimentary facies can be identified for the formation： open platform, platform exposed shoal and restricted platform facies. During the early stage of deposition of the Feixianguan Formation, there existed a sedimentary framework all the same as the Late Permian one： open platform in the west, and platform exposed shoal, restricted platform and open platform eastwards. The gradual increase of the shoal area permitted eastward migration of the shoal facies. During the deposition of the third member of the Feixianguan Formation, the study area was invaded by temporary transgressions. Till the deposition of the fourth member of the formation, the study area was prevailed over the unified restricted platform deposits, as indicated by the sedimentary model for the typical carbonate platform shoal deposits. The reservoir rocks in the Feixianguan Formation consist mostly of solution opening dolostone, and the rock types are assembled by oolitic dolostone, residual oolitic dolostone and sucrosic residual oolitic medium- to coarse-grained dolostone. The deep and shallow dual laterologs show relatively high resistivity, clear amplitude differences and time difference saltation of acoustic waves in some intervals. The seismic responses are indicated by low-frequency and highly variable amplitudes and chaotic reflection configurations. The reservoir rocks are characterized by high porosity-high permeability and medium porosity-medium permeability, showing a marked correlation between porosity and permeability. Solution openings are extremely developed in the reservoir rocks, including cast pores, intergranular solution openings, intercrystal pores, intercrystal solution openings, solution openings （caves） and minute fissures. Macropores and coarse pore throats are common. The reservoir rocks are apparently controlled by sedimentary facies in distribution patterns. Vertically, they occur dominantly in the second and first members of the Feixianguan Formation, and laterally in the platform exposed shoals and restricted platforms, where good natural gas potential is expected.

Permian/Triassic Boundary and Its Correlation in the Daxian-Xuanhan Area, Northeastern Sichuan Province, China

There are different opinions about the Permian/Triassic boundary and its correlation in the Daxian-Xuanhan area because of lacking typical lithological symbols and fossil criterions. Especially, it is very hard to determine the Permian/Triassic boundary in the Daxian-Xuanhan buried areas. This brings many difficulties to geological research and oil and gas exploration. Based on field investigation and studies of well cores, newly found fossils, lithological characteristics and well log analyses, the authors discussed the Permian/Triassic boundary in the Daxian-Xuanhan area and brought forward a specific scheme for its determination and regional correlation.

社会工作介入高校校园暴力问题研究——以R高校M个案为例

随着世界各地被曝光的高校校园暴力事件日益增多,高校校园暴力问题已成为一个全球性的社会问题。本文以R高校学生为具体对象,对校园暴力问题现状展开问卷调查,了解到部分大学生对校园暴力的认识不足、对校园暴力事件的处理态度和方式欠妥以及高校针对校园暴力问题的应对措施尚不完善。因此,文章以个案社会工作介入的方法对高校校园暴力问题展开系统研究,通过访谈法整合和利用案主家庭、学校、社会等各项资源,以期解决校园暴力带来的一系列问题。最后,结合R高校在校园暴力问题上的主要问题以及前期研究结论,文章从大学生、家庭、学校以及社会四个维度给出了预防与治理高校校园暴力的有关建议,以期实现研究视角的扩展与内容的革新。