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1.
以铁法矿区大隆矿东三采区周边煤层采空区的三维地震资料解释为例,在分析煤层采空区岩层形变机理及地质特征的基础上,介绍三维地震反射特征及沿层地震属性分析技术在煤层采空区解释方面的特点.通过示例研究表明由于煤层采空区上覆岩层的坍塌及形变,致使该区域不能形成反射波或反射信号微弱,采空区上部出现波速降低,地震反射波时间明显出现下拉现象;采空区范围内地震波振幅变弱,致使出现煤层反射波零乱及地震波同相轴中断现象.该区三维地震资料解释煤层采空区的研究成果证实,以现在地震地质解释精度,能够为煤层采空区周边工作面的合理布置和采空区探放水提供可靠的地质依据. 相似文献
2.
以红柳林煤矿采空区的三维地震勘探为例,对房柱式采煤形成的采空区的地震波场进行了正演模拟,分析了不同采空区地震波振幅特征、频谱特征及绕射波对采空区地震响应的影响;利用均方根振幅(RMS)属性圈定了小煤窑采空区范围。钻探验证结果表明,利用地震属性解释采空区的应用效果良好。 相似文献
3.
渤海油田古近系三角洲沉积发育巨厚（大于100 m）的砂岩和砾岩储层,储层横向变化快,内部非均质性强,地震预测难题大。文章针对此类问题,提出一种基于厚度解释量版的砂砾岩定量表征方法。根据已有钻井资料建立井点处地质模型,结合已有地质资料分析储层可能的变化形式,形成地质模型库,对地质模型库进行正演获得相应的正演地震资料库,然后提取正演地震资料的反射振幅属性,建立不同砂砾岩变化形式下的厚度解释量版,最后提取实际地震资料的反射振幅属性,将其投射到厚度解释量版上,实现对巨厚砂砾岩储层的定量表征。该方法克服了常规地震反演、地震属性等方法难以有效刻画巨厚砂砾岩储层的难题,实现了对具有干涉效应的巨厚砂砾岩储层的厚度及其内部变化的精确定量表征。 相似文献
4.
通过对珠江口盆地恩平凹陷文昌组成湖条件、钻井岩心、油源对比和地震反射特征的综合分析,推断其满足发育大规模中-深湖相烃源岩条件,进而类比珠江口盆地已证实富烃洼陷(PY4洼、LF13洼)文昌组中-深湖相烃源岩地震反射特征(低频强振幅连续反射与席状弱振幅-空白反射),揭示研究区中-深湖相烃源岩空间展布规律及其发育模式.研究结果表明:研究区烃源岩具有低频强振幅连续反射特征和席状弱振幅-空白反射两种地震相特征.低频强振幅连续反射特征的烃源岩,其3级层序均有发育,恩平17洼中平面上主要集中于其中部及西部,上文昌组较下文昌组烃源岩沉积范围小且沉积中心向控凹断层F1侧迁移;恩平18洼中平面上主要位于18洼中部靠控洼断层F2断层一侧,上文昌组较下文昌组烃源岩沉积范围大,沉积中心没有明显迁移.席状弱振幅-空白反射特征的烃源岩,以SQ3~SQ5层序发育为主,恩平17洼中平面上局限于洼陷内部低隆起南部小型负向构造单元中;恩平18洼中平面上位于洼陷深洼带中.研究区发育3种中-深湖相烃源岩发育模式:(1)烃源岩主要发育在湖侵体系域和高位体系域;(2)恩平17洼上文昌组早期SQ5层序,对应烃源岩在低位体系域发育;(3)恩平17洼中低隆起南部的烃源岩发育,受小型负向构造单元控制. 相似文献
5.
以河东煤田乡宁矿区的地震勘探为例,在分析采空区形成的地质条件、地球物理特征及其地震属性响应的基础上,从20多种属性中优选出对采空区较为敏感的平均振幅能量值、振幅正负极值比、最大反射率、瞬时频率、瞬时相位等属性,为采空区解释取得了理想的效果。。 相似文献
6.
涪陵地区位于川东南探区北部,通过该区石炭系黄龙组地震剖面测线逐条解释,识别出了四种典型异常反射结构：①地震同相轴波峰、波谷均表现为中振幅～弱振幅;②地震同相轴下拉波峰振幅有强有弱,上部波谷反射呈现强振幅～中振幅;③地震反射同相轴明显下拉,同时下拉同相轴上部反射呈现中振幅～弱振幅、下部反射振幅减弱;④地震同相轴反射为弱振幅,近空白反射或弱波谷反射。基于岩溶单元发育理论模型及该区沉积特征,对四种典型地震剖面反射异常地质成因解释进行了地球物理正演模拟,结果显示了与实际典型地震反射结构相吻合的地震剖面特征。其分别代表了岩溶高地峰丛与浅洼发育;被泥质充填或半充填的溶洞或孔隙性非常高的储层发育;高泥质含量充填物,或低速度、未被完全充填的缝洞体发育;7 m～9 m及以下的黄龙组地层。同时,基于特殊剖面结构研究成果,对该区可能发育的新型储层类型进行了预测,有效地指导了该区下部油气有利储层的寻找。 相似文献
7.
《中国煤炭地质》2015,(11)
焦作市某煤矿拟建安置小区范围内有十余个村办小煤窑,先后开采过二1煤层和一5煤层,采深80~160 m,总采厚7.3 m左右。为准确分析评价采空区的稳定性,采用可控源音频大地电磁测深进行采空区探测。测区内完成测线8条,测点数75个,测线总长度3.75km。测量参数:发射偶极距AB为2 km,点距MN为25 m,收发距Rx为4.5~5.5 km,采集频率范围为7 680~1 Hz。根据各测线反演得到的电阻率断面图进行解释,共圈出采空区4处、推断断层4条。经钻孔验证解释完全正确,推断出的上覆岩层冒落、断裂破坏及离层发育程度基本一致;与部分采掘工程平面图确认的的采空区边界基本吻合。 相似文献
8.
《中国煤炭地质》2016,(2)
利用一个简单的三层地质模型,正演模拟了煤层气赋存导致其与正常煤层之间多种地震属性的差异,如振幅属性、能量属性、频率属性与相位属性等。煤层中含气量的变化将导致各地震属性表现出不同的响应特征:1大部分属性值表现为随煤层气含量的增加而增加,如均方根振幅属性、平均能量属性、平均波谷振幅属性、最小振幅属性等,其中平均波谷振幅属性、最小振幅属性等在煤层气含量超过30 m3/t后,属性值变化不大;2另有瞬时频率属性在煤层气含量为0~30 m3/t,属性值随煤层气含量的增加而减小,超过30 m3/t后,属性值呈跳跃式变化,变化范围不大。利用地震属性技术选取了平均波峰振幅、为瞬时频率、为最大振幅、弧长等4种属性对山西某区煤层气含量进行预测,预测结果表明绝对误差一般小于3 m3/t,相对误差大多小于20%。 相似文献
9.
通过介绍结构张量矩阵构建及其特征向量与特征值的算法原理,提出了利用梯度结构张量矩阵特征值计算Chaos及其边缘属性,以提高不同类型采空区三维地震资料解释精度的技术思路,并讨论了在地震数据结构张量chaos、边缘检测属性计算中的关键环节。实例分析表明,chaos和边缘属性可以精细描述不同类型采空区的地震反射结构特征变化规律:工作面采空区可形成明显的杂乱反射结构,平面呈连续密实的团块状或宽条带状异常;巷道采空区则表现为微波状弯曲反射结构,具有串珠状、短而弯曲的线状、窄条状平面特征。基于地震数据梯度结构张量算法的属性分析是精细识别和解释采空区的一个有效工具。 相似文献
10.
塔中Ⅰ号坡折带奥陶系凝析气田勘探中的古地貌学方法 总被引：11，自引：1，他引：10
针对塔中地区碳酸盐岩埋藏深度大、横向非均质性强、岩层顶面地震反射强而内幕地震反射弱且分辨率低等地震地质特点,充分利用三维地震信息,精细解释了上奥陶统桑塔木组内部地震反射强振幅、强连续等时界面和碳酸盐岩顶界面,刻画了塔中Ⅰ号坡折带奥陶系碳酸盐岩台地—陆棚边缘高能礁滩体的地貌学特征,建立了碳酸盐岩建隆的地震地质模式。该模式为全面认识该区碳酸盐岩建隆沉积体系的发育特征和分布范围提供了重要依据,并在该区奥陶系凝析气田勘探、有利勘探区带评价和储量评估中得到了成功应用,取得了良好的经济效益。 相似文献
11.
Emily Keeble David I. Whiteside Michael J. Benton 《Proceedings of the Geologists' Association. Geologists' Association》2018,129(2):99-119
Pant-y-ffynnon Quarry in South Wales yielded a rich cache of fossils in the early 1950s, including articulated specimens of new species (the small sauropodomorph dinosaur Pantydraco caducus and the crocodylomorph Terrestrisuchus gracilis), but no substantial study of the wider fauna of the Pant-y-ffynnon fissure systems has been published. Here, our overview of existing specimens, a few described but mostly undescribed, as well as freshly processed material, provides a comprehensive picture of the Pant-y-ffynnon palaeo-island of the Late Triassic. This was an island with a relatively impoverished fauna dominated by small clevosaurs (rhynchocephalians), including a new species, Clevosaurus cambrica, described here from a partially articulated specimen and isolated bones. The new species has a dental morphology that is intermediate between the Late Triassic Clevosaurus hudsoni, from Cromhall Quarry to the east, and the younger C. convallis from Pant Quarry to the west, suggesting adaptive radiation of clevosaurs in the palaeo-archipelago. The larger reptiles on the palaeo-island do not exceed 1.5?m in length, including a small carnivorous crocodylomorph, Terrestrisuchus, and a possible example of insular dwarfism in the basal dinosaur Pantydraco. 相似文献
12.
The effect of water on accessory phase solubility in subaluminous and peralkaline granitic melts 总被引：4，自引：0，他引：4
The solubilities of columbite, tantalite, wolframite, rutile, zircon and hafnon were determined as a function of the water contents in peralkaline and subaluminous granite melts. All experiments were conducted at 1035 °C and 2 kbar and the water contents of the melts ranged from nominally dry to approximately 6 wt.% H2O. Accessory phase solubilities are not affected by the water content of the peralkaline melt. By contrast, solubilities are affected by the water content of the subaluminous melt, where the solubilities of all the accessory phases examined increase with the water content of the melt, up to 2 wt.% H2O. At higher water contents, solubilities are nearly constant. It can be concluded that water is not an important control of accessory phase solubility, although the water content will affect diffusivities of components in the melt, thus whether or not accessory phases will be present as restite material. The solubility behaviour in the subaluminous and peralkaline melts supports previous spectroscopic studies, which have observed differences in the coordination of high field strength elements in dry vs. wet subaluminous granitic glasses, but not for peralkaline granitic glasses. Lastly, the fact that wolframite solubility increases with increasing water content in the subaluminous melt suggests that tungsten dissolved as a hexavalent species. 相似文献
13.
Muriel Rocher Stéphane Baize Stéphane Jaillet Edward Marc Cushing Yannick Lozac&#x;h Francis Lemeille 《Comptes Rendus Geoscience》2003,335(8):701-708
Calcite samples were extracted both from the rock matrix and the superficial coating of a karstified fault plane of an underground quarry, located in the eastern border of the Paris basin. The karstification is dated as Quaternary. Analysis of mechanical calcite twinning reveals that only the calcite matrix has also undergone a compression trending WNW that can be attributed to the Mio-Pliocene alpine collision. Both coating and matrix have undergone a strike-slip regime with σ1 roughly trending north–south, that could correspond to the regional present-day state of stress, a strike-slip compression rather trending NNW, modified by local phenomena. To cite this article: M. Rocher et al., C. R. Geoscience 335 (2003). 相似文献
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正20141756 Chen Ruige(Mathematical College,China University of Geosciences,Beijing100083,China);Zhou Xun Numerical Simulation of Groundwater Level Fluctuation in a Coastal Confined Aquifer with Sloping Initial Groundwater Level Induced by the Tide(Geological Bulletin of China,ISSN1671-2552,CN11-4648/P,32(7),2013,p.1099-1104,6 illus.,16 refs.) Key words:confined water,groundwater level 相似文献
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正20141408 Cai Jia(Institute of Geology,Chinese Academy of Geological Sciences,Beijing100037,China);Liu Fulai Petrogenesis and Metamorphic P-T Conditions of Garnet-Spinel-Biotitebearing Paragneiss in Danangou Area,Daqingshan-Wulashan Metamorphic Complex Belt(Acta Petrologica Sinica,ISSN1000-0569,CN11-1922/P,29(7), 相似文献
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正20142386An Guoying(China Aero Geophysical Survey and Remote Sensing Center for Land and Resources,Beijing 100083,China)Application of Satellite Remote Sensing in Regional Hydrogeological Investigation:Taking Cenozoic Strata in Wenquan Sheet(1∶250 000)of Karakoram Range as an Example(Geosci- 相似文献
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正20141016An Chengbang(Key Laboratory of Western China’s Environmental Systems,Ministry of Education,Lanzhou University,Lanzhou 730000,China);Zhao Yongtao Lake Records during the Last Glacial Maximum from Xinjiang,NW China and Their Climatic Impli- 相似文献
19.
正20141538 Cao Qing(School of Earth Sciences and Engineering,Xi’an Petroleum University,Xi’an 710065,China);Zhao Jingzhou Characteristics and Significance of Fluid Inclusions from Majiagou Formation,Yichuan Huangling Area,Ordos Basin(Advances in Earth Science,ISSN1001-8166,CN62-1091/P,28(7),2013,p.819-828,7 illus.,3 tables,43 refs.) 相似文献
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正20142002 Wei Hualing(Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences,Langfang065000,China);Zhou Guohua Element Content and Mineral Compositions in Different Sizes of Soil in Tongling Area,Anhui Province(Geological Bulletin of China,ISSN1671-2552,CN11-4648/P,32(11),2013,p.1861 相似文献