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根据克希霍夫积分法的原理,介绍了叠前时间偏移的方法特点,实现过程,以及对地震资料的要求,依托国家重大产业技术专项“西部煤炭资源高精度三维地震勘探”工程,对“青海省鱼卡煤田四井田高精度三维地震勘探”资料进行叠前时间偏移,结果表明其能较好地解决成像质量差、能量聚焦不明显、绕射波收敛不理想等方面的难题。通过与叠后时间偏移对比,对于大倾角地层、断块小且多的破碎带、陡倾角不对称向斜等地质问题,其叠前时间偏移剖面成像质量都有明显的提高,反映的构造关系更加清晰,同相轴连续性增强。总结该方法在多个矿区的推广经验.认为合理的观测系统、较高的资料信噪比,准确的测量资料及较高的中表层速度调查精度是做好叠前时间偏移的前提。 相似文献
3.
Developing ecotourism in First World, resource-dependent areas 总被引:1,自引:0,他引:1
Deborah Che 《Geoforum》2006,37(2):212-226
Ecotourism, an economic diversification tool most commonly applied in the Third World as a means to protect ecosystems, preserve local cultures, and spur economic development, has recently been applied in First World resource-dependent areas. While ecotourism has traditionally focused on Third World ‘undisturbed’ protected lands, it has also been developed in their First World equivalents (i.e., old-growth forests) as well as in First World sites of past resource extraction and in places where current agricultural practices maintain cherished cultural landscapes. Forest County, Pennsylvania, a timber-dependent area, sought to diversify its economy by developing ecotourism based on its unique Allegheny hardwood forests, which are produced by timber harvesting. This ecotourism would encourage amenity-based, locally-driven economic development and maintain timber harvesting. While government and foundation supported ecotourism development efforts in areas dependent on resource extraction have incorporated some of ecotourism’s ideals, these operations have had mixed success. Such isolated areas, which have traditionally drawn visitors independently engaging in traditional outdoor recreation activities, have not been able to draw enough customers willing to pay for natural and cultural history tours. If ecotourism is to be successful, such areas may need further government support and destination branding to increase name recognition in order to counter the global orientation of the nature tour industry. For true community development, local collaborative efforts including resource and environmental interests are also required in which primary production is connected to processing and consumers through value-added and service sector activities such as tourism. 相似文献
4.
初至折射波静校正技术在复杂探区地震数据处理中的应用 总被引:1,自引:0,他引:1
山区及黄土塬地区近地表结构复杂,地形起伏大、低降速带横向变化剧烈,地震资料处理中的静校正难度加大。长波长静校正容易引起构造形态畸变,短波长静校正影响地震剖面信噪比。针对此类问题,从长波长静校正问题及短波长地表非一致性问题分析入手,提出部分炮检距叠加识别长波长静校正技术及分段统计逼近地表非一致性校正技术。该技术在复杂地表区与其它相关技术综合应用,可有效解决长、短波长静校正问题。 相似文献
5.
柴达木盆地北缘上三叠统—侏罗系层序特征与含油气系统划分 总被引:3,自引:2,他引:3
本文应用层序地层学理论将柴达木盆地缘上三叠统-侏罗系划分为5个层序、12个体系域,确定了该区烃源岩主要赋存在层序Ⅱ和层序Ⅲ的湖侵体系域深湖相泥岩中;通过地震剖面追踪,圈定了烃源岩赋存于下株罗统层序Ⅱ和中株罗统层序Ⅲ中,主要以冷湖-南八仙构造带为边界;烃源岩发育层段的地震相、沉积相研究表明,下株罗统层序Ⅱ的湖侵体系域发育大面积的滨浅湖、沼泽相沉积,在湖盆中心发育面积较小的半深湖-深湖相沉积,中株罗统层序Ⅲ的湖侵体系域仅在鱼卡凹陷及其周缘发育半深湖相;依据层序划发、沉积相的研究成果,确定了主要生烃中心,并依据烃源岩分布特征将柴达木盆地北缘划发为J1(!)-R和2(!)-E2个含油气系统,其中J1(!)-R含油气系统为中等丰度的含油气系统,围绕其周围的昆特依构造、冷湖七号构造、伊克雅乌汝构造是有利的勘探目标;J2(!)-E含油气系统面积较小,烃源岩厚度较薄,勘探潜力较小。 相似文献
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Che Yong-tai Yu Jin-zi Zhang Shu-liang Fan Xue-fang Guo Jun-jie Zhang Tian-yuan Yang Jin-lan 《地震学报(英文版)》2002,15(2):226-233
A lot of slow fluctuations of water level have been observed in the original recording maps of subsurface fluid in Well Shuozhou,
Shanxi Province. Some typical recording maps of the “precursors” are introduced in the paper and the features of the “precursors”
recorded by the well are analyzed. The results show that 38% strong earthquakes possess this kind of record, which has a fluctuation
period arranging from several to tens of minutes and appear mostly two days before the earthquakes. Moreover, the mechanism,
transmission and responding conditions of well water level are discussed, as well as the scientific meaning and practical
value of the “precursor” of the well water level in earthquake predictions.
Foundation item: State Natural Science Foundation of China (19973011). 相似文献
8.
玛尼7.9级地震对昆仑山口西8.1级地震的触发作用及动力背景初探 总被引:6,自引:1,他引:6
根据库仑静应力变化的概念,对青藏块体中部地区1997年11月8日玛尼7.9级地震及2001年11月14日昆仑山口西8.1级地震的应力触发作用进行了初步研究。不同震源机制解计算结果表明,玛尼地震造成了昆仑地震断层面上10^-3MPa量级的库仑应力增量,该变化仅使得昆仑地震的发生提前了最长10年左右,表明当前地壳应变能水平可能并不很低。对照20世纪初以来全球7级以上强震频度和强度演化特征与地球自转变化的关系,认为地球自转幅度衰减、变化频率升高是近期强震活动的重要控制因素。昆仑山口西8.1级地震的发生,可能是地球自转持续加速阶段后期,青藏块体内部区域应力场逐渐强化,及玛尼地震应力触发的结果。 相似文献
9.
Based on Coulomb static stress variation, the stress trigging action of the Mani ( Ms7.9, Nov.1997) earthquake on the West Kuulun Mountains Pass (MsS.1, Nov. 2001 ) earthquake is researched. Results of different source mechanism resolutions show that a 10_3 MPa Coulomb stress due to the Mani earthquake was added to the fracture fault of the Kunlun earthquake, and this may shift the broken date to about 10 years earlier, and infer that the stress level in the crust is not low. Comparing the relationship between strong earthquake strength and frequency and earth rotation change, it is shown that the strength‘s decrease and the variation period‘ s shortening of earth rotation are important controlling factors on strong earthquake activity. This great event with Ms = 8.1 took place probably due to a gradual strengthening background of regional stress field within the Qinghai-Xizang block in the period of acceleration of change of day‘s length and stress triggering from the Mani earthquake. 相似文献
10.
Energy serves as an alternative index to response quantities like force or displacement to include the duration‐related seismic damage effect. A procedure to evaluate the absorbed energy in a multistorey frame from energy spectra was developed. For low‐ to medium‐rise frames, it required a static pushover analysis of the structure to determine the modal yield force and ductility factor of an equivalent single‐degree‐of‐freedom system for the first two modes. The energy spectra were then used to determine the energy contribution of each mode. A procedure was also developed to distribute the energy along the frame height based on energy shapes. This study showed that the second‐mode response in some cases needs to be considered to reflect the energy (or damage) concentration in the upper floors. Copyright © 2002 John Wiley & Sons, Ltd. 相似文献