Structural Styles of the Longmenshan Thrust Belt and Evolution of the Foreland Basin in Western Sichuan Province, China

The Longmenshan thrust system consists of two major groups of structural styles according to the depth of their involvement: basement thrusts-compressional fault blocks; fold-thrust system in the cover. In cross-section, the Longmenshan structural belt is divided into 5 zones. The propagation of the Longmenshan thrust system is piggy-back due to pushing at the early stage and overstep due to gravity sliding at the late stage. Balanced cross-sections and palinspastic reconstruction reveal that the total sliding displacement of the thrust system amounts to 120 km. The tectonic evolution of the Tethys domain in western Sichuan has experienced 5 stages: continental break-up; ocean-continent subduction ; continent-arc collision; orogenic thrusting; uplift of western Sichuan.     

基于循环注蒸气和烟气激励的海上稠油开采技术

通过实验和油藏数值模拟,研究循环注蒸气和烟气激励的加热降黏、气体溶解降黏、气体扩大加热腔与减少热损失、蒸气与气体协同增产效应等开采机理,优化注入蒸气和烟气温度、烟气蒸气体积比、周期蒸气和气体注入量等参数,建议注入蒸气与烟气的温度高于300℃,在大气压下烟气蒸气体积比为0.4～0.6.在渤海稠油油田开展4口井循环注蒸气和烟气激励开采的现场试验.结果表明,循环注蒸气和烟气激励开采后稠油井平均日产油量达到冷采的3倍以上,最高日产油量超过100m3,周期产油量达到1.0×104 m3左右.基于循环注蒸气和烟气激励的海上开采稠油技术可以提高海上稠油开采速度和采收率,有潜力成为未来海上稠油油田的主要热采开发方式.     

排序对模糊度解算中降相关性能的影响分析

针对不同排序算法对模糊度解算存在降相关性能影响的问题,从理论上分析了自然升序法、对称旋转法及扰动升序法的降相关原理,并基于模拟数据和实测数据,从降相关时间、搜索时间、总体耗时、Bootstrapping成功率及条件数5个方面对3种算法进行对比分析。结果表明,降相关效率与搜索椭球压缩程度呈负相关关系,搜索椭球压缩程度越高,降相关效率越低;对于不同的排序算法,提高降相关性能的关键在于减少降相关时间及对条件方差按一定方向排序,进而提高搜索效率。     

山东地磁台网受宁东高压直流输电干扰预处理质量分析

为进一步提高山东地磁台网受高压直流输电干扰的预处理质量,通过中国地震前兆数据处理系统中相对差值检测和预处理检测功能,对山东地磁台网多年来受宁东高压直流输电干扰预处理情况进行了总结分析。结果表明,经过数据预处理,宁东高压直流输电干扰基本被去除,但仍然存在高压直流输电干扰误判、起止时间错判、干扰幅度计量不精确等问题。针对上述问题,对数据进行复核和校对,应用"缓变台阶"功能重新处理,并加强对H、D分量干扰特征的研究。     

Main Controlling Factors on Hydrocarbon Accumulation and Distribution in Marine Sedimentary Sequences in South China

Multiple source rock assemblages were deposited in the sedimentary provinces in South China in geologic history,and some of them were destructed by and some survived against multiple tectonic movements.Therefore,multiple sources,mixed sources,and uneven distribution of sources occurred in the marine sedimentary basins in South China during the late stage of hydrocarbon pooling.Epidiagenesis of the marine carbonate reservoirs and its modification to reservoir poroperm characteristics determined the formation and the scale of natural gas pools.The exploration practices show that the large to medium gas fields mainly occur in areas with high-quality reservoirs.Detailed study of the paleo-oil accumulations and typical oil and gas reservoirs reveals that the basins experienced multiphase superimposition and modification,leading to the distribution of the Paleozoic paleo-oil accumulations and bitumen in the peripheral areas.The phenomenon that oil and gas production concentrates in the Sichuan basin indicates that the overall sealing conditions of a basin determine the oil/gas potentials and the scale of oil and gas production.This is a critical factor controlling the accumulation and distribution of gas in the marine sequences in South China.The early oil and gas pools in the Yangtze platform left billions of bitumen in the peripheral areas due to the destruction of seals.Since the Himalayan,"late-generation and late-accumulation" gas pools represented by the gas pools in the Sichuan (四川) basin were formed in the marine sedimentary sequences in South China as a result of the change of the sealing conditions.Current gas discoveries appear to be "paleo-generation and paleo-accumulation" gas pools but actually are "late-generation and late-accumulation" gas pools.These patterns of hydrocarbon pooling clearly depict themselves in western Sichuan basin and Weiyuan (威远)gas field.It is revealed that the gas pools in the Sichuan basin were mainly formed as a result of hydrocarbon phase change (thermal cracking of oil to gas),miscible migration,and dynamic equilibration since the Himalayan.A large number of gas pools were formed in the Himalayan and the gas pools in the marine sequences are characterized by late pooling; this kind of gas fields/pools are controlled by:(1) effectiveness of modification and superimposition of the marine basins,(2) effectiveness of the source rocks,(3) effectiveness of the overall preservation conditions,and (4) effectiveness of plays.     

X射线荧光方法进行野外找矿及成矿规律研究的现状和前景

目前,能量色散Ｘ射线荧光现场测量方法已经逐步完善,能够在现场取得多种元素含量的近似定量数据,为地质勘查工作提供元素含量及其分布的信息,在此基础上要求加大方法应用的深度和广度,将Ｘ射线荧光方法取得的资料应用于矿产预测,成矿规律,地质构造及基础地质研究等方面,本文根据作者近年的实际工作成果并汇集有关资料,用丰富的实例文章爱一领域的现状,并提出今后发展的重点和前景。     

基于自然语言处理的大气质量舆情空间化方法

为了弥补由于固定监测站点稀疏而造成的局部区域大气污染事件的漏查漏检,提出了基于自然语言处理(natu-ral language processing,NLP)的大气质量舆情信息空间化方法,通过使用中文分词、词性标注等方法对舆情数据中地址信息进行提取和有效的筛选组合,实现了投诉点的地址匹配和空间定位,并以热力图的形式实现...     

Quantitative assessment of the spatial distribution of 239+240Pu inventory derived from global fallout in soils from Asia and Europe

Journal of Geographical Sciences - Due to the atmospheric nuclear weapon tests carried out, terrestrial environments have been extensively contaminated by global fallout of plutonium (Pu)...     

十到百年尺度动力形态模型在珠江磨刀门河口的应用

在人类活动的参与下磨刀门河口演变已不再是纯粹的自然过程,而是自然和人类活动共同塑造的过程。建立了一个以过程模拟为主的10~100 a尺度的长周期动力形态模型(PRD-LTMM-10)用于模拟磨刀门河口在人类活动作用下的演变过程。 该模型建立在水体运动方程和沉积物输运方程的基础上,应用约简技术对模型输入和计算进行处理,并包含了用于评价和量化人类活动的抛石促淤模块和航道疏浚模块。应用该模型较真实地模拟了磨刀门河口在1977-1988 年的动力地形演变过程,并且通过模拟结果和情景分析,合理地分离了人类各种工程活动的长期影响和自然因素在河口演变中的作用。研究表明,治理工程对河口自然发展趋势造成了较大的改造,淤积强度表现为西侧大于东侧。抛石和围垦工程使横洲水道主槽逐年冲刷,深槽外移,而龙屎窟深槽上端则表现为严重淤积,深槽不断缩窄。     

CEDLES: a framework for plugin-based applications for earthquake risk prediction and loss assessment

Natural Hazards - To evaluate the seismic risk and loss caused by an earthquake, many earthquake disaster loss assessment softwares have been developed. However, it is difficult to apply one...