中国地震台网数字化改造的进展

应用数理统计方法,系统分析了2015年以来连续5年江西测震台网25个台站运行中断的原因,总结归类为8大故障类型,揭示了台站供电和通讯网络是影响正常运行的主要因素,占比达92%以上;故障统计分析显示,高温酷暑和冰冻严寒是故障高危时段,每年约有8周时间。针对主要因素和高危时段,提出了相应的改进措施与工作建议,这对江西测震台网运行保障将起到积极作用。     

永城矿区煤层底板裂隙灰岩突水机理

根据永城矿区的水文地质条件以及煤层底板裂隙突水的情况,划分出开放裂隙突水、闭合引张裂隙突水、递进导升突水等3种类型,并分析了各种类型突水的特征和突水机理。     

Compositional and geochemical characteristics of light hydrocarbons for typical marine oils and typical coal-generated oils in China

Different types of crude oils have different light hydrocarbon compositional and geochemical characteristics. Based on the light hydrocarbon data from two kinds of oils, i.e., coal-generated oils and marine oils in China, light hydrocarbons in marine oils in the Tazhong area are generally relatively enriched in n-heptane, and coal-generated oils from the Turpan Basin are enriched in methylcyclohexane. The K1 values, reported by Mango （1987）, range from 0.97 to 1.19 in marine oils, basically consistent with what was reported by Mango on light hydrocarbons in terms of the majority of the crude oil data. But the K1 values of coal-generated oils are particularly high （1.35-1.66） and far greater than those of marine oils; heptane values in marine oils, ranging from 32.3% to 45.4%, and isoheptane values, ranging from 1.9 to 3.7, are respectively higher than those of coal-generated oils, indicating that the oils are in the high-maturity stage. In addition, expulsion temperatures of coal-generated oils from the Turpan Basin are obviously lower than those of marine oils from the Tazhong area.     

扁铲侧胀试验估算地基承载力初探

通过大量扁铲侧胀试验的测试数据，以静力触探比贯入阻力Ps为桥梁，建立了扁铲侧胀试验扁铲模量ED与地基承载力特征值fak之间的经验公式，最后通过实测数据对本经验公式进行了验证。     

黏弹性VTI介质微地震数据目标导向裂缝染色逆时偏移

水力压裂技术能够改善储层中裂缝的连通性,实现致密储层油气增产,利用压裂过程中产生的微地震事件进行裂缝偏移成像有助于评价水力压裂效果.水力压裂通常在具有黏弹性和各向异性的页岩油气储层中进行,地震波传播过程中会发生具有方向性的衰减,此外微地震震源及检波器通常分布在有限区域内,导致偏移剖面上存在远场照明较差和成像干扰的问题,难以有效进行裂缝描述.本文提出了一种黏弹性VTI介质目标导向逆时偏移裂缝成像方法,首先推导了黏弹性VTI介质染色波动方程并提出了多组偏移剖面互相关染色成像条件,然后通过裂缝逆时偏移成像测试分析了微地震数据信噪比、介质参数和事件定位精度对偏移结果的影响,最后结合地震干涉法减轻了定位误差造成的干扰.数值模拟实验表明,目标导向的染色逆时偏移成像算法能够有效压制成像剖面中的伪影干扰,改善目标区域照明,提高裂缝成像的空间分辨率.

     

Proteomic analysis of acute responses to copper sulfate stress in larvae of the brine shrimp, Artemia sinica

Proteomics was used to reveal the differential protein expression profiles of acute responses to copper sulfate exposure in larvae of Artemia sinica. Fourteen differentially displayed protein spots were detected and seven of them were identified. Three spots were up-expressed and identified: actin, heat shock protein 70, and chaperone subunit 1; three down-regulated proteins were identified: arginine kinase, elongation factor-2, and glycine-rich protein; and a newly expressed protein was identified as peroxiredoxin. The study indicates the involvement of all the differentially expressed proteins in the early responses of protein expression, and in the survival of A. sinica in the presence of copper and other heavy metals; the findings improve understanding of the organism’s adaptive responses and resistance.     

神狐-一统暗沙隆起中部新生代地层层序划分及沉积演化

利用中德合作"南海地球科学联合研究"SO-49航次所采集的地震测线,对南海北部陆缘神狐-一统暗沙隆起中部的新生代地层层序进行了划分,并与北部的珠江口盆地的层序进行了对比.共识别出SB₁、SB₂、SB₃、SB₄和Tg₅个主要反射界面,对比表明:Tg 反射面为新生界基底反射,SB₁、SB₂、SB₃、SB₄相当于珠江口盆地的二级层序界面,层序界面年龄分别为:10.5 Ma 、21.0 Ma 、25.0 Ma 、39.4 Ma.在此基础上,对隆起区新生代沉积环境及其演化进行了分析,认为隆起区新生代沉积经历了断陷湖泊-滨浅海-深海相的演变过程,隆起区主要隆升时期为晚渐新世-早中新世.并就珠江口盆地早第三纪海侵方向和隆起的成因进行了初步探讨。