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1.
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. 相似文献
2.
不同的波在空间的质点运动轨迹和极化方向是不同的,利用三分量或二分量记录,在特定的以t0为中心,长为N△t的滑动时窗中计算出描述波的质点运动轨迹和极化方向的特征参数。利用这些参数可以设计出合适的极化滤波函数,保留那些满足特定要求的质点运动,而衰减那些不满足设计要求的质点运动,利用某些算子可以把弹性波分解成P波和SV波,而且衰减面波;利用另外一些算子可以把P波和SV波衰减而使面波增强。这些算子甚至可以在嗓音和信号具有相同频率的情况下,成功地提高信嗓比。 相似文献
3.
西藏桑耶地区位于青藏高原中南部,区内切割强烈,地势陡峻,属于高山峡谷区。为提高区域地质调查野外工作效率,在调查中率先开展了遥感解译研究。在充分收集已有资料的基础上,通过对GF-2卫星数据进行预处理和影像增强,结合野外验证建立了各地质要素的遥感解译标志,实现了区内不同地层岩性、侵入岩、断裂和褶皱等地质要素的提取,最终编制了研究区1:5万遥感地质解译图,为区域地质调查提供了数据支撑。结果表明: 各地质要素在GF-2数据上均有良好反映,完全满足1:5万尺度的遥感地质解译和编图的需要,充分显示出该卫星数据在区域地质调查等工作中具有良好的应用前景。 相似文献
4.
Structural Styles of the Longmenshan Thrust Belt and Evolution of the Foreland Basin in Western Sichuan Province, China 总被引:7,自引:0,他引:7
Liu Hefu Liang Huishe Cai Liguo Shen Fei China University of Geosciences Beijing Jiang Minxi 《《地质学报》英文版》1994,68(4):351-372
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. 相似文献
5.
利用区域气候模式(RegCM4)1951—2005年历史模拟和2006—2099年RCP8.5(高排放)和RCP4.5(中排放)情景下的逐日平均气温、降水量、10m风速和入射辐射通量,给出21世纪贵州省夏季与全国其他地区的旅游气候资源时空对比。结果表明:未来贵州省夏季平均气温的增幅在两种排放情景下均小于全国的增幅,且2050年以后RCP4.5(低排放)情景下的增温幅度低于RCP8.5(高排放)情景。而其他气候要素(夏季降水量,10m风速和辐射)基本上没有表现出明显的变化趋势。空间分布来看,贵州省21世纪不同阶段在两种排放情景下其夏季平均气温增幅低于北部和西部大部分区域、与云南省增幅接近,但未来云南省主要以夏季辐射增加的态势为主,尤其是21世纪中远期RCP8.5(高排放)情景下更是位于夏季辐射增加的大值中心。因此综合来看,未来夏季贵州省增温幅度较小且降水量、10m风速和辐射变化不大,将继续维持良好的夏季避暑旅游气候资源优势。同时大力提倡环保减排是维持并进一步扩大贵州省避暑旅游资源优势的有力措施。 相似文献
6.
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 总被引:3,自引:0,他引:3
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。 相似文献
7.
8.
吴立果 《测绘与空间地理信息》2021,44(5):183-184
通过分析正射影像生产中对前期项目已有DOM成果利用不足的问题,提出了正射影像局部更新的技术思路,解决了同一区域正射影像成果不能充分利用、重复生产的问题. 相似文献
9.
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)... 相似文献
10.
Full waveform inversion( FWI)is a high resolution inversion method,which can reveal detailed in-formation of the structure and lithology under comPlex geological background. It is limited by many kinds... 相似文献